Migrating a single host to an existing pool

McHenry

I have two pools each with a single host each. One has VMs and one host has none.

I wish to have both hosts in the same pool.

It appears I am unable to move a host out of it's pool as the host is the pool master.

How can I get around this?

BenjiReis

@McHenry on the host you want to join: check if /etc/stunnel/certs/sdn-controller-ca.pem exists - if not create it: touch /etc/stunnel/certs/sdn-controller-ca.pem and then
xe pool-certificate-uninstall name=sdn-controller-ca.pem then retry the join.

BenjiReis

@McHenry not sure what you mean.

You can easily join the host with no VMs to the other one by calling xe pool-join master-address=<ip of other host> master-username=... master-password=...

Then you should have a 2 hosts pool.

What make you think it's not possible?

Danp

It is also possible to perform this activity from within XO as described here. There are some prerequisites for performing this action that you should review -- https://docs.xcp-ng.org/installation/requirements/#-pool-requirements

gduperrey

You can also do this from a host's xsconsole with the menu:

Resource Pool Configuration
- Join a Resource Pool

McHenry

@BenjiReis

[21:48 svr10451 ~]# xe pool-join master-address=10.0.0.4 master-username=root master-password="*******************************"
The host joining the pool has different CA certificates from the pool coordinator while using the same name, uninstall them and try again.
<extra>: sdn-controller-ca.pem

https://docs.xenserver.com/en-us/xenserver/developer/xenserver-8/management-api/api-errors

Both hosts are xcp-ng 8.3

BenjiReis

@McHenry on the host you want to join: check if /etc/stunnel/certs/sdn-controller-ca.pem exists - if not create it: touch /etc/stunnel/certs/sdn-controller-ca.pem and then
xe pool-certificate-uninstall name=sdn-controller-ca.pem then retry the join.

McHenry

@BenjiReis

Worked perfectly. Thanks guys.

maxxie

@McHenry Hi. Could you, please, list exact steps you had to do?

Im in the same situation as in your original post. If I open first pool and simply try "Add hosts" button, and add second host, the first pool shows second host, but XO / Settings / Servers only shows first host.
And xo-cli server.getAll shows second host as "status: 'disconnected'.

So after you did steps by @BenjiReis, what exactly did you do after?
When you say "move a host out of it's pool", ho do you do that?

I'm trying to solve this for more than a day now.
Thanks!

BenjiReis

@maxxie XO / Settings / Servers is to show a list our your pool's masters so one per pool.

It's expected as only the master is connected to XO and then dispach the API calls to other hosts when relevant.
If the Pool view shows 2 hosts then you're good.

You can also ssh to any of your host and run xe host-list you should see the 2 listed

maxxie

@BenjiReis Thanks. So what are my exact steps please?

I have 2 pools with 1 host each. Each host is master of its pool. (this is what you get by fresh installing xcp-ng on second machine and adding it in XO / New / Server)

I want one pool with 2 hosts.

Do I just go XO / Home / Pools / pool-1 and press "Add hosts" button selecting host-2?
Do I still need to execute xe pool-certificate-uninstall on host-2 ?

Last time I tried it I got some weird errors everywhere, but that might be because of botched Patches upgrade, I was impatient.
Thanks!

maxxie

Just going to XO / Home / Pools / pool-1 and pressing "Add hosts" button, selecting host-2 worked OK this time. So no detaching host from a pool and attaching to new pool ... just a button