752 lines
23 KiB
Go
752 lines
23 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package opts
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import (
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"context"
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"fmt"
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"io/ioutil"
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"os"
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"path/filepath"
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"sort"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"github.com/containerd/containerd/containers"
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"github.com/containerd/containerd/log"
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"github.com/containerd/containerd/mount"
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"github.com/containerd/containerd/oci"
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runtimespec "github.com/opencontainers/runtime-spec/specs-go"
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"github.com/opencontainers/selinux/go-selinux/label"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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"golang.org/x/sys/unix"
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runtime "k8s.io/cri-api/pkg/apis/runtime/v1"
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"github.com/containerd/containerd/pkg/cri/util"
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osinterface "github.com/containerd/containerd/pkg/os"
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)
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// WithAdditionalGIDs adds any additional groups listed for a particular user in the
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// /etc/groups file of the image's root filesystem to the OCI spec's additionalGids array.
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func WithAdditionalGIDs(userstr string) oci.SpecOpts {
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return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) (err error) {
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if s.Process == nil {
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s.Process = &runtimespec.Process{}
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}
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gids := s.Process.User.AdditionalGids
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if err := oci.WithAdditionalGIDs(userstr)(ctx, client, c, s); err != nil {
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return err
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}
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// Merge existing gids and new gids.
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s.Process.User.AdditionalGids = mergeGids(s.Process.User.AdditionalGids, gids)
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return nil
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}
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}
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func mergeGids(gids1, gids2 []uint32) []uint32 {
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gidsMap := make(map[uint32]struct{})
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for _, gid1 := range gids1 {
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gidsMap[gid1] = struct{}{}
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}
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for _, gid2 := range gids2 {
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gidsMap[gid2] = struct{}{}
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}
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var gids []uint32
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for gid := range gidsMap {
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gids = append(gids, gid)
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}
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sort.Slice(gids, func(i, j int) bool { return gids[i] < gids[j] })
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return gids
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}
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// WithoutDefaultSecuritySettings removes the default security settings generated on a spec
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func WithoutDefaultSecuritySettings(_ context.Context, _ oci.Client, c *containers.Container, s *runtimespec.Spec) error {
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if s.Process == nil {
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s.Process = &runtimespec.Process{}
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}
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// Make sure no default seccomp/apparmor is specified
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s.Process.ApparmorProfile = ""
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if s.Linux != nil {
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s.Linux.Seccomp = nil
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}
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// Remove default rlimits (See issue #515)
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s.Process.Rlimits = nil
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return nil
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}
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// WithMounts sorts and adds runtime and CRI mounts to the spec
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func WithMounts(osi osinterface.OS, config *runtime.ContainerConfig, extra []*runtime.Mount, mountLabel string) oci.SpecOpts {
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return func(ctx context.Context, client oci.Client, _ *containers.Container, s *runtimespec.Spec) (err error) {
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// mergeMounts merge CRI mounts with extra mounts. If a mount destination
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// is mounted by both a CRI mount and an extra mount, the CRI mount will
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// be kept.
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var (
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criMounts = config.GetMounts()
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mounts = append([]*runtime.Mount{}, criMounts...)
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)
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// Copy all mounts from extra mounts, except for mounts overridden by CRI.
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for _, e := range extra {
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found := false
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for _, c := range criMounts {
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if filepath.Clean(e.ContainerPath) == filepath.Clean(c.ContainerPath) {
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found = true
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break
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}
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}
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if !found {
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mounts = append(mounts, e)
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}
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}
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// Sort mounts in number of parts. This ensures that high level mounts don't
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// shadow other mounts.
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sort.Sort(orderedMounts(mounts))
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// Mount cgroup into the container as readonly, which inherits docker's behavior.
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s.Mounts = append(s.Mounts, runtimespec.Mount{
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Source: "cgroup",
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Destination: "/sys/fs/cgroup",
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Type: "cgroup",
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Options: []string{"nosuid", "noexec", "nodev", "relatime", "ro"},
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})
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// Copy all mounts from default mounts, except for
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// - mounts overridden by supplied mount;
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// - all mounts under /dev if a supplied /dev is present.
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mountSet := make(map[string]struct{})
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for _, m := range mounts {
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mountSet[filepath.Clean(m.ContainerPath)] = struct{}{}
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}
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defaultMounts := s.Mounts
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s.Mounts = nil
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for _, m := range defaultMounts {
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dst := filepath.Clean(m.Destination)
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if _, ok := mountSet[dst]; ok {
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// filter out mount overridden by a supplied mount
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continue
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}
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if _, mountDev := mountSet["/dev"]; mountDev && strings.HasPrefix(dst, "/dev/") {
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// filter out everything under /dev if /dev is a supplied mount
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continue
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}
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s.Mounts = append(s.Mounts, m)
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}
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for _, mount := range mounts {
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var (
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dst = mount.GetContainerPath()
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src = mount.GetHostPath()
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)
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// Create the host path if it doesn't exist.
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// TODO(random-liu): Add CRI validation test for this case.
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if _, err := osi.Stat(src); err != nil {
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if !os.IsNotExist(err) {
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return errors.Wrapf(err, "failed to stat %q", src)
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}
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if err := osi.MkdirAll(src, 0755); err != nil {
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return errors.Wrapf(err, "failed to mkdir %q", src)
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}
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}
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// TODO(random-liu): Add cri-containerd integration test or cri validation test
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// for this.
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src, err := osi.ResolveSymbolicLink(src)
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if err != nil {
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return errors.Wrapf(err, "failed to resolve symlink %q", src)
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}
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if s.Linux == nil {
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s.Linux = &runtimespec.Linux{}
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}
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options := []string{"rbind"}
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switch mount.GetPropagation() {
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case runtime.MountPropagation_PROPAGATION_PRIVATE:
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options = append(options, "rprivate")
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// Since default root propagation in runc is rprivate ignore
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// setting the root propagation
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case runtime.MountPropagation_PROPAGATION_BIDIRECTIONAL:
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if err := ensureShared(src, osi.(osinterface.UNIX).LookupMount); err != nil {
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return err
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}
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options = append(options, "rshared")
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s.Linux.RootfsPropagation = "rshared"
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case runtime.MountPropagation_PROPAGATION_HOST_TO_CONTAINER:
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if err := ensureSharedOrSlave(src, osi.(osinterface.UNIX).LookupMount); err != nil {
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return err
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}
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options = append(options, "rslave")
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if s.Linux.RootfsPropagation != "rshared" &&
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s.Linux.RootfsPropagation != "rslave" {
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s.Linux.RootfsPropagation = "rslave"
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}
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default:
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log.G(ctx).Warnf("Unknown propagation mode for hostPath %q", mount.HostPath)
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options = append(options, "rprivate")
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}
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// NOTE(random-liu): we don't change all mounts to `ro` when root filesystem
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// is readonly. This is different from docker's behavior, but make more sense.
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if mount.GetReadonly() {
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options = append(options, "ro")
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} else {
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options = append(options, "rw")
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}
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if mount.GetSelinuxRelabel() {
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if err := label.Relabel(src, mountLabel, false); err != nil && err != unix.ENOTSUP {
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return errors.Wrapf(err, "relabel %q with %q failed", src, mountLabel)
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}
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}
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s.Mounts = append(s.Mounts, runtimespec.Mount{
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Source: src,
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Destination: dst,
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Type: "bind",
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Options: options,
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})
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}
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return nil
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}
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}
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const (
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etcHosts = "/etc/hosts"
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etcHostname = "/etc/hostname"
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resolvConfPath = "/etc/resolv.conf"
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)
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// WithRelabeledContainerMounts relabels the default container mounts for files in /etc
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func WithRelabeledContainerMounts(mountLabel string) oci.SpecOpts {
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return func(ctx context.Context, client oci.Client, _ *containers.Container, s *runtimespec.Spec) (err error) {
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if mountLabel == "" {
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return nil
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}
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for _, m := range s.Mounts {
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switch m.Destination {
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case etcHosts, etcHostname, resolvConfPath:
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if err := label.Relabel(m.Source, mountLabel, false); err != nil {
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return err
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}
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}
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}
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return nil
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}
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}
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// Ensure mount point on which path is mounted, is shared.
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func ensureShared(path string, lookupMount func(string) (mount.Info, error)) error {
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mountInfo, err := lookupMount(path)
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if err != nil {
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return err
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}
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// Make sure source mount point is shared.
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optsSplit := strings.Split(mountInfo.Optional, " ")
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for _, opt := range optsSplit {
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if strings.HasPrefix(opt, "shared:") {
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return nil
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}
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}
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return errors.Errorf("path %q is mounted on %q but it is not a shared mount", path, mountInfo.Mountpoint)
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}
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// ensure mount point on which path is mounted, is either shared or slave.
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func ensureSharedOrSlave(path string, lookupMount func(string) (mount.Info, error)) error {
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mountInfo, err := lookupMount(path)
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if err != nil {
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return err
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}
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// Make sure source mount point is shared.
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optsSplit := strings.Split(mountInfo.Optional, " ")
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for _, opt := range optsSplit {
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if strings.HasPrefix(opt, "shared:") {
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return nil
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} else if strings.HasPrefix(opt, "master:") {
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return nil
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}
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}
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return errors.Errorf("path %q is mounted on %q but it is not a shared or slave mount", path, mountInfo.Mountpoint)
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}
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// getDeviceUserGroupID() is used to find the right uid/gid
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// value for the device node created in the container namespace.
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// The runtime executes mknod() and chmod()s the created
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// device with the values returned here.
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//
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// On Linux, uid and gid are sufficient and the user/groupname do not
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// need to be resolved.
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//
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// TODO(mythi): In case of user namespaces, the runtime simply bind
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// mounts the devices from the host. Additional logic is needed
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// to check that the runtimes effective UID/GID on the host has the
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// permissions to access the device node and/or the right user namespace
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// mappings are created.
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//
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// Ref: https://github.com/kubernetes/kubernetes/issues/92211
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func getDeviceUserGroupID(runAsVal *runtime.Int64Value) uint32 {
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if runAsVal != nil {
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return uint32(runAsVal.GetValue())
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}
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return 0
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}
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// WithDevices sets the provided devices onto the container spec
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func WithDevices(osi osinterface.OS, config *runtime.ContainerConfig, enableDeviceOwnershipFromSecurityContext bool) oci.SpecOpts {
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return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) (err error) {
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if s.Linux == nil {
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s.Linux = &runtimespec.Linux{}
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}
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if s.Linux.Resources == nil {
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s.Linux.Resources = &runtimespec.LinuxResources{}
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}
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oldDevices := len(s.Linux.Devices)
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for _, device := range config.GetDevices() {
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path, err := osi.ResolveSymbolicLink(device.HostPath)
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if err != nil {
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return err
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}
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o := oci.WithDevices(path, device.ContainerPath, device.Permissions)
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if err := o(ctx, client, c, s); err != nil {
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return err
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}
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}
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if enableDeviceOwnershipFromSecurityContext {
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UID := getDeviceUserGroupID(config.GetLinux().GetSecurityContext().GetRunAsUser())
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GID := getDeviceUserGroupID(config.GetLinux().GetSecurityContext().GetRunAsGroup())
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// Loop all new devices added by oci.WithDevices() to update their
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// dev.UID/dev.GID.
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//
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// non-zero UID/GID from SecurityContext is used to override host's
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// device UID/GID for the container.
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for idx := oldDevices; idx < len(s.Linux.Devices); idx++ {
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if UID != 0 {
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*s.Linux.Devices[idx].UID = UID
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}
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if GID != 0 {
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*s.Linux.Devices[idx].GID = GID
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}
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}
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}
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return nil
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}
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}
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// WithCapabilities sets the provided capabilities from the security context
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func WithCapabilities(sc *runtime.LinuxContainerSecurityContext, allCaps []string) oci.SpecOpts {
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capabilities := sc.GetCapabilities()
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if capabilities == nil {
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return nullOpt
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}
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var opts []oci.SpecOpts
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// Add/drop all capabilities if "all" is specified, so that
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// following individual add/drop could still work. E.g.
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// AddCapabilities: []string{"ALL"}, DropCapabilities: []string{"CHOWN"}
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// will be all capabilities without `CAP_CHOWN`.
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if util.InStringSlice(capabilities.GetAddCapabilities(), "ALL") {
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opts = append(opts, oci.WithCapabilities(allCaps))
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}
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if util.InStringSlice(capabilities.GetDropCapabilities(), "ALL") {
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opts = append(opts, oci.WithCapabilities(nil))
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}
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var caps []string
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for _, c := range capabilities.GetAddCapabilities() {
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if strings.ToUpper(c) == "ALL" {
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continue
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}
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// Capabilities in CRI doesn't have `CAP_` prefix, so add it.
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caps = append(caps, "CAP_"+strings.ToUpper(c))
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}
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opts = append(opts, oci.WithAddedCapabilities(caps))
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caps = []string{}
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for _, c := range capabilities.GetDropCapabilities() {
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if strings.ToUpper(c) == "ALL" {
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continue
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}
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caps = append(caps, "CAP_"+strings.ToUpper(c))
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}
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opts = append(opts, oci.WithDroppedCapabilities(caps))
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return oci.Compose(opts...)
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}
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// WithoutAmbientCaps removes the ambient caps from the spec
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func WithoutAmbientCaps(_ context.Context, _ oci.Client, c *containers.Container, s *runtimespec.Spec) error {
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if s.Process == nil {
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s.Process = &runtimespec.Process{}
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}
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if s.Process.Capabilities == nil {
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s.Process.Capabilities = &runtimespec.LinuxCapabilities{}
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}
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s.Process.Capabilities.Ambient = nil
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return nil
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}
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// WithDisabledCgroups clears the Cgroups Path from the spec
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func WithDisabledCgroups(_ context.Context, _ oci.Client, c *containers.Container, s *runtimespec.Spec) error {
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if s.Linux == nil {
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s.Linux = &runtimespec.Linux{}
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}
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s.Linux.CgroupsPath = ""
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return nil
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}
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// WithSelinuxLabels sets the mount and process labels
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func WithSelinuxLabels(process, mount string) oci.SpecOpts {
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return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) (err error) {
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if s.Linux == nil {
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s.Linux = &runtimespec.Linux{}
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}
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if s.Process == nil {
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s.Process = &runtimespec.Process{}
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}
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s.Linux.MountLabel = mount
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s.Process.SelinuxLabel = process
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return nil
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}
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}
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// WithResources sets the provided resource restrictions
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func WithResources(resources *runtime.LinuxContainerResources, tolerateMissingHugetlbController, disableHugetlbController bool) oci.SpecOpts {
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return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) (err error) {
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if resources == nil {
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return nil
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}
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if s.Linux == nil {
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s.Linux = &runtimespec.Linux{}
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}
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if s.Linux.Resources == nil {
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s.Linux.Resources = &runtimespec.LinuxResources{}
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}
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if s.Linux.Resources.CPU == nil {
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s.Linux.Resources.CPU = &runtimespec.LinuxCPU{}
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}
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if s.Linux.Resources.Memory == nil {
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s.Linux.Resources.Memory = &runtimespec.LinuxMemory{}
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}
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var (
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p = uint64(resources.GetCpuPeriod())
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q = resources.GetCpuQuota()
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shares = uint64(resources.GetCpuShares())
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limit = resources.GetMemoryLimitInBytes()
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hugepages = resources.GetHugepageLimits()
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)
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if p != 0 {
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s.Linux.Resources.CPU.Period = &p
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}
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if q != 0 {
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s.Linux.Resources.CPU.Quota = &q
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}
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if shares != 0 {
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s.Linux.Resources.CPU.Shares = &shares
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}
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if cpus := resources.GetCpusetCpus(); cpus != "" {
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s.Linux.Resources.CPU.Cpus = cpus
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}
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if mems := resources.GetCpusetMems(); mems != "" {
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s.Linux.Resources.CPU.Mems = resources.GetCpusetMems()
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}
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if limit != 0 {
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s.Linux.Resources.Memory.Limit = &limit
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}
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if !disableHugetlbController {
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if isHugetlbControllerPresent() {
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for _, limit := range hugepages {
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s.Linux.Resources.HugepageLimits = append(s.Linux.Resources.HugepageLimits, runtimespec.LinuxHugepageLimit{
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Pagesize: limit.PageSize,
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Limit: limit.Limit,
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})
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}
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} else {
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if !tolerateMissingHugetlbController {
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return errors.Errorf("huge pages limits are specified but hugetlb cgroup controller is missing. " +
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"Please set tolerate_missing_hugetlb_controller to `true` to ignore this error")
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}
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logrus.Warn("hugetlb cgroup controller is absent. skipping huge pages limits")
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}
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}
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|
|
if unified := resources.GetUnified(); unified != nil {
|
|
if s.Linux.Resources.Unified == nil {
|
|
s.Linux.Resources.Unified = make(map[string]string)
|
|
}
|
|
for k, v := range unified {
|
|
s.Linux.Resources.Unified[k] = v
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
|
|
var (
|
|
supportsHugetlbOnce sync.Once
|
|
supportsHugetlb bool
|
|
)
|
|
|
|
func isHugetlbControllerPresent() bool {
|
|
supportsHugetlbOnce.Do(func() {
|
|
supportsHugetlb = false
|
|
if IsCgroup2UnifiedMode() {
|
|
supportsHugetlb, _ = cgroupv2HasHugetlb()
|
|
} else {
|
|
supportsHugetlb, _ = cgroupv1HasHugetlb()
|
|
}
|
|
})
|
|
return supportsHugetlb
|
|
}
|
|
|
|
var (
|
|
_cgroupv1HasHugetlbOnce sync.Once
|
|
_cgroupv1HasHugetlb bool
|
|
_cgroupv1HasHugetlbErr error
|
|
_cgroupv2HasHugetlbOnce sync.Once
|
|
_cgroupv2HasHugetlb bool
|
|
_cgroupv2HasHugetlbErr error
|
|
isUnifiedOnce sync.Once
|
|
isUnified bool
|
|
)
|
|
|
|
// cgroupv1HasHugetlb returns whether the hugetlb controller is present on
|
|
// cgroup v1.
|
|
func cgroupv1HasHugetlb() (bool, error) {
|
|
_cgroupv1HasHugetlbOnce.Do(func() {
|
|
if _, err := ioutil.ReadDir("/sys/fs/cgroup/hugetlb"); err != nil {
|
|
_cgroupv1HasHugetlbErr = errors.Wrap(err, "readdir /sys/fs/cgroup/hugetlb")
|
|
_cgroupv1HasHugetlb = false
|
|
} else {
|
|
_cgroupv1HasHugetlbErr = nil
|
|
_cgroupv1HasHugetlb = true
|
|
}
|
|
})
|
|
return _cgroupv1HasHugetlb, _cgroupv1HasHugetlbErr
|
|
}
|
|
|
|
// cgroupv2HasHugetlb returns whether the hugetlb controller is present on
|
|
// cgroup v2.
|
|
func cgroupv2HasHugetlb() (bool, error) {
|
|
_cgroupv2HasHugetlbOnce.Do(func() {
|
|
controllers, err := ioutil.ReadFile("/sys/fs/cgroup/cgroup.controllers")
|
|
if err != nil {
|
|
_cgroupv2HasHugetlbErr = errors.Wrap(err, "read /sys/fs/cgroup/cgroup.controllers")
|
|
return
|
|
}
|
|
_cgroupv2HasHugetlb = strings.Contains(string(controllers), "hugetlb")
|
|
})
|
|
return _cgroupv2HasHugetlb, _cgroupv2HasHugetlbErr
|
|
}
|
|
|
|
// IsCgroup2UnifiedMode returns whether we are running in cgroup v2 unified mode.
|
|
func IsCgroup2UnifiedMode() bool {
|
|
isUnifiedOnce.Do(func() {
|
|
var st syscall.Statfs_t
|
|
if err := syscall.Statfs("/sys/fs/cgroup", &st); err != nil {
|
|
panic("cannot statfs cgroup root")
|
|
}
|
|
isUnified = st.Type == unix.CGROUP2_SUPER_MAGIC
|
|
})
|
|
return isUnified
|
|
}
|
|
|
|
// WithOOMScoreAdj sets the oom score
|
|
func WithOOMScoreAdj(config *runtime.ContainerConfig, restrict bool) oci.SpecOpts {
|
|
return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) error {
|
|
if s.Process == nil {
|
|
s.Process = &runtimespec.Process{}
|
|
}
|
|
|
|
resources := config.GetLinux().GetResources()
|
|
if resources == nil {
|
|
return nil
|
|
}
|
|
adj := int(resources.GetOomScoreAdj())
|
|
if restrict {
|
|
var err error
|
|
adj, err = restrictOOMScoreAdj(adj)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
s.Process.OOMScoreAdj = &adj
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// WithSysctls sets the provided sysctls onto the spec
|
|
func WithSysctls(sysctls map[string]string) oci.SpecOpts {
|
|
return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) error {
|
|
if s.Linux == nil {
|
|
s.Linux = &runtimespec.Linux{}
|
|
}
|
|
if s.Linux.Sysctl == nil {
|
|
s.Linux.Sysctl = make(map[string]string)
|
|
}
|
|
for k, v := range sysctls {
|
|
s.Linux.Sysctl[k] = v
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// WithPodOOMScoreAdj sets the oom score for the pod sandbox
|
|
func WithPodOOMScoreAdj(adj int, restrict bool) oci.SpecOpts {
|
|
return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) error {
|
|
if s.Process == nil {
|
|
s.Process = &runtimespec.Process{}
|
|
}
|
|
if restrict {
|
|
var err error
|
|
adj, err = restrictOOMScoreAdj(adj)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
s.Process.OOMScoreAdj = &adj
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// WithSupplementalGroups sets the supplemental groups for the process
|
|
func WithSupplementalGroups(groups []int64) oci.SpecOpts {
|
|
return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) error {
|
|
if s.Process == nil {
|
|
s.Process = &runtimespec.Process{}
|
|
}
|
|
var guids []uint32
|
|
for _, g := range groups {
|
|
guids = append(guids, uint32(g))
|
|
}
|
|
s.Process.User.AdditionalGids = mergeGids(s.Process.User.AdditionalGids, guids)
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// WithPodNamespaces sets the pod namespaces for the container
|
|
func WithPodNamespaces(config *runtime.LinuxContainerSecurityContext, sandboxPid uint32, targetPid uint32) oci.SpecOpts {
|
|
namespaces := config.GetNamespaceOptions()
|
|
|
|
opts := []oci.SpecOpts{
|
|
oci.WithLinuxNamespace(runtimespec.LinuxNamespace{Type: runtimespec.NetworkNamespace, Path: GetNetworkNamespace(sandboxPid)}),
|
|
oci.WithLinuxNamespace(runtimespec.LinuxNamespace{Type: runtimespec.IPCNamespace, Path: GetIPCNamespace(sandboxPid)}),
|
|
oci.WithLinuxNamespace(runtimespec.LinuxNamespace{Type: runtimespec.UTSNamespace, Path: GetUTSNamespace(sandboxPid)}),
|
|
}
|
|
if namespaces.GetPid() != runtime.NamespaceMode_CONTAINER {
|
|
opts = append(opts, oci.WithLinuxNamespace(runtimespec.LinuxNamespace{Type: runtimespec.PIDNamespace, Path: GetPIDNamespace(targetPid)}))
|
|
}
|
|
return oci.Compose(opts...)
|
|
}
|
|
|
|
// WithDefaultSandboxShares sets the default sandbox CPU shares
|
|
func WithDefaultSandboxShares(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) error {
|
|
if s.Linux == nil {
|
|
s.Linux = &runtimespec.Linux{}
|
|
}
|
|
if s.Linux.Resources == nil {
|
|
s.Linux.Resources = &runtimespec.LinuxResources{}
|
|
}
|
|
if s.Linux.Resources.CPU == nil {
|
|
s.Linux.Resources.CPU = &runtimespec.LinuxCPU{}
|
|
}
|
|
i := uint64(DefaultSandboxCPUshares)
|
|
s.Linux.Resources.CPU.Shares = &i
|
|
return nil
|
|
}
|
|
|
|
// WithoutNamespace removes the provided namespace
|
|
func WithoutNamespace(t runtimespec.LinuxNamespaceType) oci.SpecOpts {
|
|
return func(ctx context.Context, client oci.Client, c *containers.Container, s *runtimespec.Spec) error {
|
|
if s.Linux == nil {
|
|
return nil
|
|
}
|
|
var namespaces []runtimespec.LinuxNamespace
|
|
for i, ns := range s.Linux.Namespaces {
|
|
if ns.Type != t {
|
|
namespaces = append(namespaces, s.Linux.Namespaces[i])
|
|
}
|
|
}
|
|
s.Linux.Namespaces = namespaces
|
|
return nil
|
|
}
|
|
}
|
|
|
|
func nullOpt(_ context.Context, _ oci.Client, _ *containers.Container, _ *runtimespec.Spec) error {
|
|
return nil
|
|
}
|
|
|
|
func getCurrentOOMScoreAdj() (int, error) {
|
|
b, err := ioutil.ReadFile("/proc/self/oom_score_adj")
|
|
if err != nil {
|
|
return 0, errors.Wrap(err, "could not get the daemon oom_score_adj")
|
|
}
|
|
s := strings.TrimSpace(string(b))
|
|
i, err := strconv.Atoi(s)
|
|
if err != nil {
|
|
return 0, errors.Wrap(err, "could not get the daemon oom_score_adj")
|
|
}
|
|
return i, nil
|
|
}
|
|
|
|
func restrictOOMScoreAdj(preferredOOMScoreAdj int) (int, error) {
|
|
currentOOMScoreAdj, err := getCurrentOOMScoreAdj()
|
|
if err != nil {
|
|
return preferredOOMScoreAdj, err
|
|
}
|
|
if preferredOOMScoreAdj < currentOOMScoreAdj {
|
|
return currentOOMScoreAdj, nil
|
|
}
|
|
return preferredOOMScoreAdj, nil
|
|
}
|
|
|
|
const (
|
|
// netNSFormat is the format of network namespace of a process.
|
|
netNSFormat = "/proc/%v/ns/net"
|
|
// ipcNSFormat is the format of ipc namespace of a process.
|
|
ipcNSFormat = "/proc/%v/ns/ipc"
|
|
// utsNSFormat is the format of uts namespace of a process.
|
|
utsNSFormat = "/proc/%v/ns/uts"
|
|
// pidNSFormat is the format of pid namespace of a process.
|
|
pidNSFormat = "/proc/%v/ns/pid"
|
|
)
|
|
|
|
// GetNetworkNamespace returns the network namespace of a process.
|
|
func GetNetworkNamespace(pid uint32) string {
|
|
return fmt.Sprintf(netNSFormat, pid)
|
|
}
|
|
|
|
// GetIPCNamespace returns the ipc namespace of a process.
|
|
func GetIPCNamespace(pid uint32) string {
|
|
return fmt.Sprintf(ipcNSFormat, pid)
|
|
}
|
|
|
|
// GetUTSNamespace returns the uts namespace of a process.
|
|
func GetUTSNamespace(pid uint32) string {
|
|
return fmt.Sprintf(utsNSFormat, pid)
|
|
}
|
|
|
|
// GetPIDNamespace returns the pid namespace of a process.
|
|
func GetPIDNamespace(pid uint32) string {
|
|
return fmt.Sprintf(pidNSFormat, pid)
|
|
}
|