[ClusterLabs] Adding a node to an active cluster

[Igor Tverdovskiy]

Forgot to disable maintenance mode in instruction

6) sudo crm configure property maintenance-mode=false

On Wed, Oct 21, 2020 at 6:49 PM Igor Tverdovskiy <
igor.tverdovskiy.pe at gmail.com> wrote:

> Hi Jiaqi,
>
> The most reliable way to add a new node according to my practice is the
> following:
> 1. update corosync.conf files among all hosts in cluster including the new
> node
> 2. copy corosync auth file to the new node
> 3. enable maintenance:
> a) sudo crm configure property maintenance-mode=true
> When global maintenance mode is enabled you may safely stop pacemaker and
> corosync services
>
> b) sudo crm status
> ensure it is enabled on all nodes(it is global mode, but if you have
> split-brain not all nodes can be affected by command)
> 4. stop pacemaker and corosync services on all nodes
> 5. start pacemaker and corosync services on all node *on by one (one node
> at a time)*
>
> After this you will have all nodes in a cluster. You may try to do a
> simple restart of pacemaker and corosync services without stopping them
> and without starting in a sequence, but this will not always work.
>
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