How to upgrade from a one master to a multimaster HA solutio

Archive SUSE CaaS Platform
1

Hi,

is there a way, to move an existing running solution with one master to a multimaster solution (HA etcd etc) without reinstalling? If I try to reinstall (actual version) from scratch I got an error (see my other post) and I don’t get a working kubernetes cluster at all. I need at least a possibility to redistribute the certs after including the vip of the LoadBalancer in the trusted server list. Ist there a way (with salt?) to do this ?

Thanks for the help …

Frank

2

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3

Frank, this is not possible in version 2 - you can only add later new workers. With version 3, this will be possible.

Andreas

4

[QUOTE=a_jaeger;51923]Frank, this is not possible in version 2 - you can only add later new workers. With version 3, this will be possible.

Andreas[/QUOTE]

Hi Andreas,

thanks for your help!!!

I’m a litte bit “disorientated” with the Master HA implementation from SUSE … there is no real documentation about it :frowning:

For me, it is a real black box …

If I do the Initialization of the CaaS Cluster with 3 Masters (by the way, it seems, that the last patches fixed my kube-dns problem from my other post, now ther is no crash any more after cluster init), “kubectl get cs” still shows:

[FONT=Courier New]NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {“health”: “true”}[/FONT]

where are my other etcd instances, or how can I check, if the master clustering is ok ?

Best regards

Frank

5

Frank,

to get information about the cluster and its master nodes, run:

kubectl cluster-info

For information about etcd, log in to any node of the cluster and run:

set -a; source /etc/sysconfig/etcdctl; set +a; etcdctl cluster-health
6

ok ok, I was on the wrong track … (by the way “kubectl get cs” and “kubectl cluster-info” still only shows one master, but etcctl was correct).
My original problem what made me suspect some cluster misconfiguration was on the loadbalancer site (wrong haproxy config leaded to error messages pointig to a false direction). After I found it all worked as expected.

Best regards and thans for the help …

Frank