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fix(kubelet): protect containerCleanupInfos from concurrent map writes

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Signed-off-by: knight42 <anonymousknight96@gmail.com>
This commit is contained in:
knight42
2020-08-07 16:54:38 +08:00
parent 6ce9e71cd5
commit a471843246
2 changed files with 24 additions and 4 deletions
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25
pkg/kubelet/dockershim/docker_container.go
View File

@@ -83,6 +83,25 @@ func (ds *dockerService) ListContainers(_ context.Context, r *runtimeapi.ListCon
return &runtimeapi.ListContainersResponse{Containers: result}, nil
}
func (ds *dockerService) getContainerCleanupInfo(containerID string) (*containerCleanupInfo, bool) {
ds.cleanupInfosLock.RLock()
defer ds.cleanupInfosLock.RUnlock()
info, ok := ds.containerCleanupInfos[containerID]
return info, ok
}
func (ds *dockerService) setContainerCleanupInfo(containerID string, info *containerCleanupInfo) {
ds.cleanupInfosLock.Lock()
defer ds.cleanupInfosLock.Unlock()
ds.containerCleanupInfos[containerID] = info
}
func (ds *dockerService) clearContainerCleanupInfo(containerID string) {
ds.cleanupInfosLock.Lock()
defer ds.cleanupInfosLock.Unlock()
delete(ds.containerCleanupInfos, containerID)
}
// CreateContainer creates a new container in the given PodSandbox
// Docker cannot store the log to an arbitrary location (yet), so we create an
// symlink at LogPath, linking to the actual path of the log.
@@ -185,7 +204,7 @@ func (ds *dockerService) CreateContainer(_ context.Context, r *runtimeapi.Create
// we don't perform the clean up just yet at that could destroy information
// needed for the container to start (e.g. Windows credentials stored in
// registry keys); instead, we'll clean up when the container gets removed
ds.containerCleanupInfos[containerID] = cleanupInfo
ds.setContainerCleanupInfo(containerID, cleanupInfo)
}
return &runtimeapi.CreateContainerResponse{ContainerId: containerID}, nil
}
@@ -461,11 +480,11 @@ func (ds *dockerService) UpdateContainerResources(_ context.Context, r *runtimea
}
func (ds *dockerService) performPlatformSpecificContainerForContainer(containerID string) (errors []error) {
if cleanupInfo, present := ds.containerCleanupInfos[containerID]; present {
if cleanupInfo, present := ds.getContainerCleanupInfo(containerID); present {
errors = ds.performPlatformSpecificContainerCleanupAndLogErrors(containerID, cleanupInfo)
if len(errors) == 0 {
delete(ds.containerCleanupInfos, containerID)
ds.clearContainerCleanupInfo(containerID)
}
}

3
pkg/kubelet/dockershim/docker_service.go
View File

@@ -31,7 +31,7 @@ import (
dockertypes "github.com/docker/docker/api/types"
"k8s.io/klog/v2"
"k8s.io/api/core/v1"
v1 "k8s.io/api/core/v1"
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
kubeletconfig "k8s.io/kubernetes/pkg/kubelet/apis/config"
"k8s.io/kubernetes/pkg/kubelet/checkpointmanager"
@@ -316,6 +316,7 @@ type dockerService struct {
// (see `applyPlatformSpecificDockerConfig` and `performPlatformSpecificContainerCleanup`
// methods for more info).
containerCleanupInfos map[string]*containerCleanupInfo
cleanupInfosLock sync.RWMutex
}
// TODO: handle context.