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>
99 lines
2.6 KiB
Go
99 lines
2.6 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 shim
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import (
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"context"
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"fmt"
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"net"
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"os"
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"syscall"
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"time"
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winio "github.com/Microsoft/go-winio"
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"github.com/containerd/containerd/namespaces"
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"github.com/pkg/errors"
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)
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const shimBinaryFormat = "containerd-shim-%s-%s.exe"
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func getSysProcAttr() *syscall.SysProcAttr {
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return nil
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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 nil
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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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return nil
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}
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// SocketAddress returns a npipe 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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return fmt.Sprintf("\\\\.\\pipe\\containerd-shim-%s-%s-pipe", ns, id), nil
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}
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// AnonDialer returns a dialer for a npipe
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func AnonDialer(address string, timeout time.Duration) (net.Conn, error) {
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var c net.Conn
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var lastError error
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timedOutError := errors.Errorf("timed out waiting for npipe %s", address)
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start := time.Now()
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for {
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remaining := timeout - time.Since(start)
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if remaining <= 0 {
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lastError = timedOutError
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break
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}
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c, lastError = winio.DialPipe(address, &remaining)
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if lastError == nil {
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break
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}
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if !os.IsNotExist(lastError) {
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break
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}
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// There is nobody serving the pipe. We limit the timeout for this case
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// to 5 seconds because any shim that would serve this endpoint should
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// serve it within 5 seconds. We use the passed in timeout for the
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// `DialPipe` timeout if the pipe exists however to give the pipe time
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// to `Accept` the connection.
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if time.Since(start) >= 5*time.Second {
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lastError = timedOutError
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break
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}
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time.Sleep(10 * time.Millisecond)
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}
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return c, lastError
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}
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// NewSocket returns a new npipe listener
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func NewSocket(address string) (net.Listener, error) {
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l, err := winio.ListenPipe(address, nil)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to listen to npipe %s", address)
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}
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return l, nil
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}
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