7a12374003
This patch does the following: - Move the CONTRIBUTING doc content into the developer documentation - Move the development-stack doc content into the developer documentation - Rename all instances of 'OpenStack Ansible' to 'OpenStack-Ansible' - Implements a simpler navigation index for the bottom of the page - Implements a navigation index at the bottom of all developer docs - Updates the README to reflect where to get documentation and further information - Adds more information into the 'scripts' developer doc - Updates the 'Additional Resources' Appendix with Ansible information Change-Id: Ic08ba072f3b3d1e4e446d1e81c20c0cdf01833de
1.5 KiB
1.5 KiB
Home OpenStack-Ansible Installation Guide
Single-node failure
If a single node fails, the other nodes maintain quorum and continue to process SQL requests.
Run the following Ansible command to determine the failed node:
$ ansible galera_container -m shell -a "mysql -h localhost\ -e 'show status like \"%wsrep_cluster_%\";'" node3_galera_container-3ea2cbd3 | FAILED | rc=1 >> ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) node2_galera_container-49a47d25 | success | rc=0 >> Variable_name Value wsrep_cluster_conf_id 17 wsrep_cluster_size 3 wsrep_cluster_state_uuid 338b06b0-2948-11e4-9d06-bef42f6c52f1 wsrep_cluster_status Primary node4_galera_container-76275635 | success | rc=0 >> Variable_name Value wsrep_cluster_conf_id 17 wsrep_cluster_size 3 wsrep_cluster_state_uuid 338b06b0-2948-11e4-9d06-bef42f6c52f1 wsrep_cluster_status PrimaryIn this example, node 3 has failed.
Restart MariaDB on the failed node and verify that it rejoins the cluster.
If MariaDB fails to start, run the mysqld command and perform further analysis on the output. As a last resort, rebuild the container for the node.