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Prevent kube-proxy from panicing when sysfs is mounted as read-only.

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Send a node event when this happens and hint to the administrator
about the remediation.
This commit is contained in:
Random-Liu
2016-07-08 10:45:20 -07:00
parent 42805f53b0
commit 4246853211
2 changed files with 53 additions and 2 deletions
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15
cmd/kube-proxy/app/server.go
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@@ -299,8 +299,19 @@ func (s *ProxyServer) Run() error {
// Tune conntrack, if requested
if s.Conntracker != nil {
if s.Config.ConntrackMax > 0 {
if err := s.Conntracker.SetMax(int(s.Config.ConntrackMax)); err != nil {
return err
err := s.Conntracker.SetMax(int(s.Config.ConntrackMax))
if err != nil {
if err != readOnlySysFSError {
return err
}
// readOnlySysFSError is caused by a known docker issue (https://github.com/docker/docker/issues/24000),
// the only remediation we know is to restart the docker daemon.
// Here we'll send an node event with specific reason and message, the
// administrator should decide whether and how to handle this issue,
// whether to drain the node and restart docker.
// TODO(random-liu): Remove this when the docker bug is fixed.
const message = "DOCKER RESTART NEEDED (docker issue #24000): /sys is read-only: can't raise conntrack limits, problems may arise later."
s.Recorder.Eventf(s.Config.NodeRef, api.EventTypeWarning, err.Error(), message)
}
}
if s.Config.ConntrackTCPEstablishedTimeout.Duration > 0 {