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
1.4 KiB
1.4 KiB
Home OpenStack-Ansible Installation Guide
Complete failure
If all of the nodes in a Galera cluster fail (do not shutdown gracefully), then the integrity of the database can no longer be guaranteed and should be restored from backup. Run the following command to determine if all nodes in the cluster have failed:
$ ansible galera_container -m shell -a "cat /var/lib/mysql/grastate.dat"
node3_galera_container-3ea2cbd3 | success | rc=0 >>
# GALERA saved state
version: 2.1
uuid: 338b06b0-2948-11e4-9d06-bef42f6c52f1
seqno: -1
cert_index:
node2_galera_container-49a47d25 | success | rc=0 >>
# GALERA saved state
version: 2.1
uuid: 338b06b0-2948-11e4-9d06-bef42f6c52f1
seqno: -1
cert_index:
node4_galera_container-76275635 | success | rc=0 >>
# GALERA saved state
version: 2.1
uuid: 338b06b0-2948-11e4-9d06-bef42f6c52f1
seqno: -1
cert_index:All the nodes have failed if mysqld is not running on
any of the nodes and all of the nodes contain a seqno value
of -1.
If any single node has a positive seqno value, then that
node can be used to restart the cluster. However, because there is no
guarantee that each node has an identical copy of the data, it is not
recommended to restart the cluster using the
--wsrep-new-cluster command on one node.