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kubeadm-troubleshooting: add entry about multi-valued args (#12937) 

Add TS entry about the case where it's not possible to
pass multi-valued arguments to --component-name-extra-args flags
from the command line.
pull/13033/head
Lubomir I. Ivanov 2019-03-13 01:56:38 +02:00 committed by Kubernetes Prow Robot
parent 6362d6173e
commit a15d6ebed9
1 changed files with 19 additions and 0 deletions
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19
content/en/docs/setup/independent/troubleshooting-kubeadm.md
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@ -261,4 +261,23 @@ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/dock
yum install docker-ce-18.06.1.ce-3.el7.x86_64
```
## Not possible to pass a comma separated list of values to arguments inside a `--component-extra-args` flag
`kubeadm init` flags such as `--component-extra-args` allow you to pass custom arguments to a control-plane
component like the kube-apiserver. However, this mechanism is limited due to the underlying type used for parsing
the values (`mapStringString`).
If you decide to pass an argument that supports multiple, comma-separated values such as
`--apiserver-extra-args "enable-admission-plugins=LimitRanger,NamespaceExists"` this flag will fail with
`flag: malformed pair, expect string=string`. This happens because the list of arguments for
`--apiserver-extra-args` expects `key=value` pairs and in this case `NamespacesExists` is considered
as a key that is missing a value.
Alternativelly, you can try separating the `key=value` pairs like so:
`--apiserver-extra-args "enable-admission-plugins=LimitRanger,enable-admission-plugins=NamespaceExists"`
but this will result in the key `enable-admission-plugins` only having the value of `NamespaceExists`.
A known workaround is to use the kubeadm
[configuration file](https://kubernetes.io/docs/setup/independent/control-plane-flags/#apiserver-flags).
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