06708191d6
This commit does the following: - sets all shell prompts in code-blocks to the root prompt - uses shell-session code-block since the shell prompt was being treated as a comment - links configure-aodh.rst in configure.rst (running tox was complaining that this file wasn't being linked anywhere) - other minor cleanup Change-Id: I9e3ac8bb0cabd1cc17952cfd765dbb0d8f7b6fa2
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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.