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Merge pull request #31378 from yifan-gu/rkt_fetch_no_store

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Automatic merge from submit-queue

rkt: Force `rkt fetch` to fetch from remote to conform the image pull policy.

Fix https://github.com/kubernetes/kubernetes/issues/27646

Use `--no-store` option for `rkt fetch` to force it to fetch from remote.
However, `--no-store` will fetch the remote image regardless of whether the content of the image has changed or not. 
This causes performance downgrade when the image tag is ':latest' and the image pull policy is 'always'. 
The issue is tracked in https://github.com/coreos/rkt/issues/2937.
This commit is contained in:
Kubernetes Submit Queue 2016-08-26 01:53:20 -07:00 committed by GitHub
commit 9deb18b989
1 changed files with 4 additions and 1 deletions
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5
pkg/kubelet/rkt/image.go
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@ -76,7 +76,10 @@ func (r *Runtime) PullImage(image kubecontainer.ImageSpec, pullSecrets []api.Sec
return err
}
if _, err := r.cli.RunCommand(&config, "fetch", dockerPrefix+img); err != nil {
// Today, `--no-store` will fetch the remote image regardless of whether the content of the image
// has changed or not. This causes performance downgrades when the image tag is ':latest' and
// the image pull policy is 'always'. The issue is tracked in https://github.com/coreos/rkt/issues/2937.
if _, err := r.cli.RunCommand(&config, "fetch", "--no-store", dockerPrefix+img); err != nil {
glog.Errorf("Failed to fetch: %v", err)
return err
}