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Use dockershim.sock for CRI #751

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merged 1 commit into from
Dec 11, 2019
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mogren
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@mogren mogren commented Dec 11, 2019

Issue #714 related

Description of changes:
In the original commit, we only checked /var/run/cri.sock to get the Sandbox ID. This works fine for CRI-O or containerd with the CRI plugin, as long as the socket is mounted correctly, but when using docker we need the /var/run/dockershim.sock created by Kubelet, since it talks gRPC with the CRI API, while /var/run/docker.sock is http only.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

@mogren mogren added the bug label Dec 11, 2019
@mogren mogren requested a review from jaypipes December 11, 2019 01:30
Fix getting the sandbox id on docker as well.
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Please update the commit message and/or the PR summary message to explain why this commit is fixing a problem. Currently, the PR summary and commit message is a bit thread-bare and doesn't indicate why falling back to the dockershim socket actually worked...

@@ -101,7 +101,7 @@ spec:
- name: AWS_VPC_K8S_CNI_VETHPREFIX
value: eni
- name: AWS_VPC_K8S_CNI_MTU
value: 9001
value: "9001"
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interesting. this was a problem?

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Yeah, for some reason I got an error applying the config without the quotes.

@@ -40,7 +40,6 @@ require (
golang.org/x/net v0.0.0-20191004110552-13f9640d40b9
golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456
golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2 // indirect
google.golang.org/appengine v1.4.0 // indirect
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hmm. this is likely due to different Golang versions in our local development environments trampling on each other... My local go version is 1.12.7. I suspect you're on 1.13 and beyond?

if err != nil {
log.Warnf("During ipamd init, failed to get Pod information from Kubernetes API Server %v", err)
ipamdErrInc("nodeInitK8SGetLocalPodIPsFailed")
// This can happens when L-IPAMD starts before kubelet.
// TODO need to add node health stats here
return errors.Wrap(err, "failed to get running pods!")
}
log.Debugf("getLocalPodsWithRetry() found %d local pods", len(localPods))
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good move...

socketPath = criSocketPath
}
log.Debugf("Getting running pod sandboxes from %q", socketPath)
conn, err := grpc.Dial(socketPath, grpc.WithInsecure())
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I suppose we can turn this into a blocking call (WithBlock() with a backoff timeout) in a future commit...

@@ -36,7 +36,7 @@ fi

AGENT_LOG_PATH=${AGENT_LOG_PATH:-aws-k8s-agent.log}
HOST_CNI_BIN_PATH=${HOST_CNI_BIN_PATH:-/host/opt/cni/bin}
HOST_CNI_CONFDIR_PATH=${HOST_CNI_CONFDIR_PATH:-/host/opt/cni/net.d}
HOST_CNI_CONFDIR_PATH=${HOST_CNI_CONFDIR_PATH:-/host/etc/cni/net.d}
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gahhhhhh!


# Best practice states we should send the container's CMD output to stdout, so
# let's tee back up the log file into stdout
cat $AGENT_LOG_PATH
cat "$AGENT_LOG_PATH"
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interesting that quote-encapping the variable in the entrypoint.sh script fixed anything here and above. I know it's safer to quote-encap vars but I'm curious whether this was an actual fix for a problem in the script.

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It didn't, but we were mixing quoted and unquoted, so I just made it consistent.

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ty sir!

@jaypipes jaypipes merged commit 759820b into aws:master Dec 11, 2019
mogren pushed a commit to mogren/amazon-vpc-cni-k8s that referenced this pull request Dec 15, 2019
Fix getting the sandbox id on docker as well.
jaypipes pushed a commit that referenced this pull request Dec 19, 2019
Fix getting the sandbox id on docker as well.
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@mogren any reason not to just mount dockershim.sock as cri.sock? That's was the original idea, leaving it up to the DaemonSet to mount the appropriate path from the host (per #714 (comment)). That was how all of my tests on Docker in EKS were done, as well.

I don't think there's anything broken by doing this instead, but it's the only place in the codebase where there's a special case for Docker, and it appears unnecessary 😛

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mogren commented Dec 31, 2019

Heh, thanks @drakedevel I think you are right. I did try to use the containerd socket at first, but since the cri-plugin was not loaded, that didn't work. I then tried just using the default docker.sock, but that of course doesn't have the right API, so then I switched to the shim. I should have iterated some more and done that, mount it as cri.sock... Time for another follow up PR I guess. 😄

mogren pushed a commit to mogren/amazon-vpc-cni-k8s that referenced this pull request Apr 20, 2020
Fix getting the sandbox id on docker as well.
mogren pushed a commit that referenced this pull request Apr 20, 2020
Fix getting the sandbox id on docker as well.
@mogren mogren deleted the fix-sandbox-delete branch June 16, 2020 06:23
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3 participants