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

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

    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. #2

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

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  3. Re: How to upgrade from a one master to a multimaster HA sol

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

    Andreas

  4. Re: How to upgrade from a one master to a multimaster HA sol

    Quote Originally Posted by a_jaeger View Post
    Frank, this is not possible in version 2 - you can only add later new workers. With version 3, this will be possible.

    Andreas
    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

    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:
    -----
    NAME STATUS MESSAGE ERROR
    scheduler Healthy ok
    controller-manager Healthy ok
    etcd-0 Healthy {"health": "true"}

    -----

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


    Best regards

    Frank

  5. Re: How to upgrade from a one master to a multimaster HA sol

    Frank,

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

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

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

  6. Re: How to upgrade from a one master to a multimaster HA sol

    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

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