[ClusterLabs] resources management - redesign

[Kristoffer Grönlund]

Hi Florin,

I'm afraid I don't quite understand what it is that you are asking. You
can specify the resource ID when creating resources, and using resource
constraints, you can specify any order/colocation structure that you
need.

> 1. RG = rg1 + following resources: fs1, fs2,fs3, ocf:heartbeat[my custom
> systemd script] 

What do you mean by ocf:heartbeat[my custom systemd script]? If you've
got your own service with a systemd service file and you don't need
custom monitoring, you can use "systemd:<name>" as the resource agent.

> Now, what solution exists ?  export cib, edit cib and re-import cib;
> what if  I will need a new fs:fs4, so what: export cib, create new
> resource inside exported cib and re-import it. 

One way to make large changes to the configuration is to

1. Stop all resources

    crm configure property stop-all-resources=true 

2. Edit configuration to what you need

    crm configure edit

3. Start all resources

   crm configure property stop-all-resources=false

You might have some success in keeping services running during editing
by using maintenance-mode=true instead, but that takes a lot more
care and is difficult to recommend in the general case.

It is also possible to use the shadow CIB facitility to simulate changes
to the cluster before applying them:

http://clusterlabs.org/man/pacemaker/crm_simulate.8.html

There's some documentation on using Hawk with the simulator which is
already outdated but might be of some help in figuring out what is
possible:

https://hawk-guide.readthedocs.io/en/latest/simulator.html

Cheers,
Kristoffer

-- 
// Kristoffer Grönlund
// kgronlund at suse.com