38 lines
1.3 KiB
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38 lines
1.3 KiB
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`Home <index.html>`_ OpenStack-Ansible Installation Guide
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Removing nodes
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--------------
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In the following example, all but one node was shut down gracefully:
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.. code-block:: bash
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$ ansible galera_container -m shell -a "mysql -h localhost\
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-e 'show status like \"%wsrep_cluster_%\";'"
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node3_galera_container-3ea2cbd3 | FAILED | rc=1 >>
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ERROR 2002 (HY000): Can't connect to local MySQL server
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through socket '/var/run/mysqld/mysqld.sock' (2)
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node2_galera_container-49a47d25 | FAILED | rc=1 >>
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ERROR 2002 (HY000): Can't connect to local MySQL server
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through socket '/var/run/mysqld/mysqld.sock' (2)
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node4_galera_container-76275635 | success | rc=0 >>
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Variable_name Value
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wsrep_cluster_conf_id 7
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wsrep_cluster_size 1
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wsrep_cluster_state_uuid 338b06b0-2948-11e4-9d06-bef42f6c52f1
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wsrep_cluster_status Primary
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Compare this example output with the output from the multi-node failure
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scenario where the remaining operational node is non-primary and stops
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processing SQL requests. Gracefully shutting down the MariaDB service on
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all but one node allows the remaining operational node to continue
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processing SQL requests. When gracefully shutting down multiple nodes,
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perform the actions sequentially to retain operation.
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--------------
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.. include:: navigation.txt
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