Server version: 10.5.16-MariaDB-1:10.5.16+maria~bullseye-log
An upgrade from 10.5.16-MariaDB-1:10.5.16+maria~buster-log to 10.5.16-MariaDB-1:10.5.16+maria~bullseye-log (buster to bullseye move) breaks mariabackup SST. The attempt to bootstrap a new cluster and adding another node to the cluster gives the below error on the joiner
In the donor node’s syslog, below error is seen:
Further investigation revealed that socat 1.7.4 (recently updated in Debian bullseye) defaults to using Server Name Indication (SNI) which breaks epoptes use of socat (https://github.com/epoptes/epoptes/issues/127) leading to failure of mariabackup SST on Bullseye. We resolved the issue by adding the no-sni option to the wsrep_sst_mariabackup script.
In the hope that it may help others in the community, we're opening this bug report.