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kubernetes
Fetching previous container logs using kubectl logs --previous --all-containers --ignore-errors is showing error messages for the pods which doesn't have previous containers
What happened?
I am running the below command to collect all logs from previous containers in my namespace. It is fetching the logs for those pods that have previous containers but in addition it is printing error messages for those pods that doesn't have previous containers(which are not restarted). I was expecting the --ignore-errors would skip such messages from the output. Is there a way to achieve that?
Command: kubectl logs -n "mynamespace" -l "label=examplelabel" --previous --all-containers --ignore-errors --prefix --timestamps=true --max-log-requests=40 --since=0s --tail=-1
Result error: previous terminated container "somecontainer" in pod "somepod" not found
What did you expect to happen?
Skip the error messages for those pods that doesn't have previous containers
How can we reproduce it (as minimally and precisely as possible)?
kubectl logs --previous --all-containers --ignore-errors --prefix --timestamps=true --max-log-requests=40 --since=0s --tail=-1
Anything else we need to know?
No response
Kubernetes version
$ kubectl version
WARNING: This version information is deprecated and will be replaced with the output from kubectl version --short. Use --output=yaml|json to get the full version.
Client Version: version.Info{Major:"1", Minor:"25", GitVersion:"v1.25.3", GitCommit:"434bfd82814af038ad94d62ebe59b133fcb50506", GitTreeState:"clean", BuildDate:"2022-10-12T10:57:26Z", GoVersion:"go1.19.2", Compiler:"gc", Platform:"linux/amd64"}
Kustomize Version: v4.5.7
Server Version: version.Info{Major:"1", Minor:"27", GitVersion:"v1.27.8-gke.1067000", GitCommit:"3936242da351c64ea89912f00faa0b28fb7eab76", GitTreeState:"clean", BuildDate:"2023-12-06T20:41:34Z", GoVersion:"go1.20.11 X:boringcrypto", Compiler:"gc", Platform:"linux/amd64"}
WARNING: version difference between client (1.25) and server (1.27) exceeds the supported minor version skew of +/-1
Cloud provider
OS version
# On Linux:
$ cat /etc/os-release
CentOS Linux release 7.9.2009 (Core)
$ uname -a
Linux <masking my hostname> 3.10.0-1160.71.1.el7.x86_64 kubernetes/kubernetes#1 SMP Tue Jun 28 15:37:28 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here
Install tools
Container runtime (CRI) and version (if applicable)
Related plugins (CNI, CSI, ...) and versions (if applicable)
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JFYI, The flag --ignore-errors is as stated :
--ignore-errors=false: If watching / following pod logs, allow for any errors that occur to be non-fatal
Are you sure this will skip pods without previous containers?
No. It won't skip pods without previous containers. Is there any way i can skip pods without previous containers from the output?
As stated in the description text of --ignore-errors flag in here;
If watching / following pod logs, allow for any errors that occur to be non-fatal
Previous pod not found error is fatal which is affecting the command's execution. I think, there seems to be no bug in here.
