Moving to another Node

pnemenz · January 25, 2025, 10:26pm

I need to reconfigre the VM Nethserver 8 is running on.
The reason is, I accidentaly made a way to big HDD and afaik there is no way to reduce the size.

So I want to setup another NS8 Node on my Proxmox-Cluster then move all Apps to this node, delete the old Node and be happy

right now I have the following APPs running:

Samba
Grafana
Mail
Netdata
Nethsecurity Controller
Nextcloud
Roundcubemail
Webserver

I already started to move the Apps to the 2nd Node. Right now I have successfully moved Grafane, Webserver, Nextcloud, Roundcubemail, Netdata

When I tryed to move Nethsecurity Controller ist hung forever at 90% and now I have juste 2 Instances installed, on each Node one.

Trying to move Mail did not work (see Log below), so I deleted Mail from the new Node, it’s still working fine on old one.

I did not touch Samba jet, nevertheless I miss Samba on the tab ‘installed’ at the softwareCenter.

So what is the save way to move Mail and Samba with all the net folders (and its data) to the new node?

What do I have to do an the Clients side after successfull migration to log on into the domain and get the netfolders right again?

<7>podman-pull-missing ghcr.io/nethserver/mail:1.5.1
<7>extract-ui ghcr.io/nethserver/mail:1.5.1
Extracting container filesystem ui to /var/lib/nethserver/cluster/ui/apps/mail6
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089cd143a1980e9a97f2150d023cdc412d6ce9a82b537d109933967967c952d2
Assertion failed
  File "/var/lib/nethserver/cluster/actions/add-module/50update", line 196, in <module>
    agent.assert_exp(create_module_result['exit_code'] == 0) # Ensure create-module is successful

mrmarkuz · January 25, 2025, 11:00pm

You could try backup/restore instead of moving.

After Samba is restored to the new node, it may be necessary to set the DC IP, see also NethServer 7 migration — NS8 documentation

If possible share relevant errors from the logs page so we can check and possibly fix the migration process.

If it’s hard to find errors you could write a specific app log to the file dump and send or share the file:

journalctl _UID=$(id -u nextcloud4) > dump

Write complete logfile to the file dump:

journalctl > dump

pnemenz · January 26, 2025, 7:54am

Thankyou for your answer.
What would be the exact steps for the backup/restore procedure?
Build the new mashine and then?

how can I stop some Apps like the mailserver before backup ?

mrmarkuz · January 26, 2025, 10:51am

Create a backup using the integrated backup, see also Backup and restore — NS8 documentation
Stop app on old node.
Restore an app of the backup to the 2nd node.
If needed manage DNS entries for the app to point to the new node.
Test the app on the new node

No need to create a new machine as you already have a second node. You can use a NAS or some online storage for the backup.

To stop an app: (for example nextcloud)

runagent -m nextcloud1 systemctl --user stop nextcloud

pnemenz · January 26, 2025, 11:19am

So just backup all I need, restore it to the 2nd node, then promote the 2nd Node to leader and delte the first Node?

mrmarkuz · January 26, 2025, 11:21am

Yes, exactly.
Just to clarify, I just meant the missing apps, you don’t need a complete backup/restore of all apps.

pnemenz · January 26, 2025, 11:21am

I’m cleanig up before doing this, so I decidet to get rid of netdata. when uninstalling I got :

mrmarkuz · January 26, 2025, 11:22am

Maybe you can ignore this error. Is the netdata app still there after a browser refresh?

pnemenz · January 26, 2025, 11:23am

yes it is

mrmarkuz · January 26, 2025, 11:26am

It should be possible to remove on CLI using remove-module

usage: remove-module [-h] [–no-preserve] [–force] module

To remove netdata3:

remove-module --no-preserve --force netdata3

pnemenz · January 26, 2025, 11:30am

Assertion failed
  File "/var/lib/nethserver/cluster/actions/remove-module/50update", line 66, in <module>
    agent.assert_exp(destroy_module_result['exit_code'] == 0)

did not work. I’m going to ignore it becouse its on node1 the one I’m going to delete anyway

pnemenz · January 26, 2025, 12:02pm

For some reason I miss Samba on SoftwareCenter | installed apps,
would this be a problem?

Andy_Wismer · January 26, 2025, 12:03pm

Hi @mrmarkuz , @pnemenz

I somehow recall that Samba / AD cannot be “removed”. They must be destroyed.

Then restored.

My 2 cents
Andy

mrmarkuz · January 26, 2025, 12:04pm

I didn’t find another way to move samba than backup/restore as samba is selectable in backup but not in Software Center.

pnemenz · January 26, 2025, 1:23pm

I cant stop the mail system

runagent -m mail5 systemctl --user stop mail
Failed to stop mail.service: Unit mail.service not loaded.

mrmarkuz · January 26, 2025, 1:41pm

In this case there are some services to stop:

runagent -m mail5 systemctl --user stop clamav rspamd postfix dovecot

pnemenz · January 26, 2025, 2:48pm

as always youre a great help.
The mail is resorred on the new Node but I think roundcube still trys to connent to the old one.
I found in the roundcube log:

Error: Login failed for peter@nemenz.at against 10.5.4.1 from 10.0.2.100 (X-Real-IP: 192.168.XXX.XXX,X-Forwarded-For: 192.168.XXX.XXX). Could not connect to 10.5.4.1:143: Connection refused in /var/www/html/program/lib/Roundcube/rcube_imap.php on line 211 (POST /?_task=login&_action=login)

10.5.4.1 is the vpn Adress of the old node

mrmarkuz · January 26, 2025, 2:50pm

Please check the NS8 Roundcube app settings in the cluster-admin, maybe it still points to the old mail server…

pnemenz · January 26, 2025, 2:56pm

I dont see any settings for the mailserver there, only roundcube-hoste name and domain.
On the DNS the forwarders are correctly and I do not have any 10.xxx.xxx.xxx aderesses there

mrmarkuz · January 26, 2025, 3:01pm

It should be possible to choose the Mail server in Roundcube settings:

Maybe it’s enough to just save the settings.