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Proxmox corosync issues

Sometimes I make a chance to my Proxmox cluster configuration without all nodes in a healthy state (i.e. they are off). This isn’t a great habit to get into and sometimes results in troubleshooting.

Putting a quick post up so I can easily reference how to resolve corosync issues.

# stop corosync and pmxcfs on all nodes
$ systemctl stop corosync pve-cluster

# start pmxcfs in local mode on all nodes
$ pmxcfs -l

# put correct corosync config into local pmxcfs and corosync config dir (make sure to bump the 'config_version' inside the config file)
$ cp correct_corosync.conf /etc/pve/corosync.conf
$ cp correct_corosync.conf /etc/corosync/corosync.conf

# kill local pmxcfs
$ killall pmxcfs

# start corosync and pmxcfs again
$ systemctl start pve-cluster corosync

# check status
$ journalctl --since '-5min' -u pve-cluster -u corosync
$ pvecm status

Source: https://forum.proxmox.com/threads/made-mistake-in-corosync-conf-now-cannot-edit.77173/

Some errors I got to help with search engines:

ipcc_send_rec[1] failed: Connection refused
ipcc_send_rec[2] failed: Connection refused
ipcc_send_rec[3] failed: Connection refused
Unable to load access control list: Connection refused

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