7dfc605fc6
This changes the shim's OOM score from a static max killable of -999 to be +1 of the containerd daemon's score. This should allow the shim's to be killed first in an OOM condition but leave the daemon alone for a bit to help cleanup and manage the containers during this situation. Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
92 lines
2.5 KiB
Go
92 lines
2.5 KiB
Go
// +build !windows
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/*
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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 shim
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import (
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"context"
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"crypto/sha256"
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"fmt"
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"net"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"time"
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"github.com/containerd/containerd/namespaces"
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"github.com/containerd/containerd/sys"
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"github.com/pkg/errors"
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)
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const shimBinaryFormat = "containerd-shim-%s-%s"
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func getSysProcAttr() *syscall.SysProcAttr {
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return &syscall.SysProcAttr{
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Setpgid: true,
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}
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}
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// SetScore sets the oom score for a process
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func SetScore(pid int) error {
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return sys.SetOOMScore(pid, sys.OOMScoreMaxKillable)
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}
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// AdjustOOMScore sets the OOM score for the process to the parents OOM score +1
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// to ensure that they parent has a lower* score than the shim
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func AdjustOOMScore(pid int) error {
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parent := os.Getppid()
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score, err := sys.GetOOMScoreAdj(parent)
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if err != nil {
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return errors.Wrap(err, "get parent OOM score")
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}
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shimScore := score + 1
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if err := sys.SetOOMScore(pid, shimScore); err != nil {
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return errors.Wrap(err, "set shim OOM score")
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}
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return nil
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}
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// SocketAddress returns an abstract socket address
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func SocketAddress(ctx context.Context, id string) (string, error) {
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ns, err := namespaces.NamespaceRequired(ctx)
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if err != nil {
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return "", err
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}
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d := sha256.Sum256([]byte(filepath.Join(ns, id)))
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return filepath.Join(string(filepath.Separator), "containerd-shim", fmt.Sprintf("%x.sock", d)), nil
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}
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// AnonDialer returns a dialer for an abstract socket
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func AnonDialer(address string, timeout time.Duration) (net.Conn, error) {
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address = strings.TrimPrefix(address, "unix://")
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return net.DialTimeout("unix", "\x00"+address, timeout)
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}
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// NewSocket returns a new socket
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func NewSocket(address string) (*net.UnixListener, error) {
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if len(address) > 106 {
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return nil, errors.Errorf("%q: unix socket path too long (> 106)", address)
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}
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l, err := net.Listen("unix", "\x00"+address)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to listen to abstract unix socket %q", address)
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}
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return l.(*net.UnixListener), nil
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}
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