With Galera (Percona Cluster or MariaDB Cluster), it is sometimes
advisable to not route traffic to a node during a backup due to
the node already being under a heavier load. In these
situations, it may be wise to not route traffic there until the
backup is complete.
Since the default /usr/bin/clustercheck script did not have the
option of doing this, we created a modified version. The
below script looks for the presence of the xtrabackup tool
running in the process list. If it is found, the
clustercheck script returns the appropriate exit code (502) which
signals the load balancer to not route traffic its way. The
script could easily be modified to look for the presence of
programs/tools in the process list.
We hope others will find it useful.
# Script to make a proxy (ie HAProxy) capable of monitoring Percona XtraDB Cluster nodes properly
# Modified by Itchy …[Read more]