Recovering Openstack Galera Cluster

2 minute read

It’s just my note, how to recovering the MariaDB galera cluster while all node failed to create new cluster after hardware failure.

The symptoms when you start a new cluster, you will find InnoDB: corruption in the InnoDB tablespace notice in mariadb.log.

InnoDB: Assertion failure in thread 1129654592 in file ibuf0ibuf.c line 4231
InnoDB: Failing assertion: page_get_n_recs(page) > 1
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: about forcing recovery.
mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help diagnose
the problem, but since we have already crashed, something is definitely wrong
and this may fail.
some backtrace
The manual page at contains
information that should help you find out what is causing the crash.
mysqld_safe Number of processes running now: 0
mysqld_safe mysqld restarted

This happen because some of your InnoDB tables are corrupt.

Shut Down all DB nodes

Shut down all DB nodes, except one node to recovery progress.

Initiate InnoDB recovery

Open wsrep_cluster_address setting to open address , so the configuration will be like this

# Group communication system handle

Turn on innodb_recovery_force=[1-6] into mariadb config file /etc/my.cnf try set the smalest value first then start the service

start maria DB service

root@nodedb3 # systemctl start mariadb

make sure MariaDB running in recovery mode.

Check DB health

Check DB health using mysqlcheck

mysqlcheck -u root -p --all-databases --check

Dumping & restore database

If the mysqlcheck found DB with tables error, make a DB dumping to make backup

to dump all database

$ mysqldump -u root -p --all-databases > alldb_backup.sql

to dump specific database

$ mysqldump -u [uname] -p[pass] [dbname] > dbname.sql

then drop the database

After sucessfully dropped database, restore it from the DB backup file.

$ mysql -u [uname] -p[pass] [db_to_restore] < [backupfile.sql]

Start MariaDB normal Mode

Comment the innodb_recovery_force option in /etc/my.cnf and restart the mariaDB service.

Start MariaDB in other Node

After MariaDB recovered from once node, start the other galera Node to recover the cluster. After Galera cluster recovered, put wsrep_cluster_address setting back to origin.