Re: [ClusterLabs] DRBD split-brain investigations, automatic fixes and manual intervention...

2021-10-21 Thread Ian Diddams via Users
On Wednesday, 20 October 2021, 18:08:50 BST, Andrei Borzenkov wrote: It depends on what hardware you have. For physical systems IPMI may be available or managed power outlets; both allow cutting power to another node over LAN. For virtual machines you may use fencing agent that contacts

Re: [ClusterLabs] DRBD split-brain investigations, automatic fixes and manual intervention...

2021-10-20 Thread Andrei Borzenkov
On 20.10.2021 17:54, Ian Diddams wrote: > > > On Wednesday, 20 October 2021, 11:15:48 BST, Andrei Borzenkov > wrote: > > >> You cannot resolve split brain without fencing. This is as simple as >> that. Your pacemaker configuration (from another mail) shows > >> pcs -f clust_cfg

Re: [ClusterLabs] DRBD split-brain investigations, automatic fixes and manual intervention...

2021-10-20 Thread Ian Diddams via Users
On Wednesday, 20 October 2021, 11:15:48 BST, Andrei Borzenkov wrote: >You cannot resolve split brain without fencing. This is as simple as >that. Your pacemaker configuration (from another mail) shows > pcs -f clust_cfg property set stonith-enabled=false > pcs -f clust_cfg property

Re: [ClusterLabs] DRBD split-brain investigations, automatic fixes and manual intervention...

2021-10-20 Thread Andrei Borzenkov
On Wed, Oct 20, 2021 at 11:54 AM Ian Diddams via Users wrote: > > So - system logs recently show this > > ESTRELA > Oct 18th > Oct 18 04:04:28 wp-vldyn-estrela kernel: [584651.491139] drbd mysql01/0 > drbd0: Split-Brain detected, 1 primaries, automatically solved. Sync from > peer node > Oct 18

[ClusterLabs] DRBD split-brain investigations, automatic fixes and manual intervention...

2021-10-20 Thread Ian Diddams via Users
I've been testing an implementation of a HA mysql cluster for a few months now. I came to this project with no preior knoweldge of what was copncerned/needed and have learned orgainscally via various online how-tos and web sites which many cases wrere slightly out-of-date to missing large