Devstack plugin to use mariadb on Ubuntu

Devstack uses mysql flavor by default on Ubuntu.
This plugin enforces MariaDB as the database backend.

README.rst

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+======================
+ Enabling in Devstack
+======================
+
+1. Download DevStack
+
+2. Add this repo as an external repository::
+
+     > cat local.conf
+     [[local|localrc]]
+     enable_plugin mariadb https://github.com/rafaelfolco/devstack-plugin-mariadb
+
+3. run ``stack.sh``

devstack/lib/mariadb

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+#!/bin/bash
+
+# MariaDB overrides for lib/databases/mysql
+
+function cleanup_mariadb {
+    stop_mariadb
+    apt_get purge -y mysql* mariadb*
+    sudo rm -rf /var/lib/mysql
+    sudo rm -rf /etc/mysql
+}
+
+function configure_mariadb {
+    local my_conf mysql slow_log
+    echo_summary "Configuring and starting MariaDB"
+
+    my_conf=/etc/mysql/my.cnf
+    mysql=mysql
+
+    sudo mysql -uroot -hlocalhost -e "GRANT ALL PRIVILEGES ON *.* TO '$DATABASE_USER'@'%' identified by '$DATABASE_PASSWORD';"
+    if [[ "$DATABASE_QUERY_LOGGING" == "True" ]]; then
+        echo_summary "Enabling MySQL query logging"
+        slow_log=/var/log/mariadb/mariadb-slow.log
+        sudo sed -e '/log.slow.queries/d' \
+            -e '/long.query.time/d' \
+            -e '/log.queries.not.using.indexes/d' \
+            -i $my_conf
+        # Turn on slow query log, log all queries (any query taking longer than
+        # 0 seconds) and log all non-indexed queries
+        iniset -sudo $my_conf mysqld slow-query-log 1
+        iniset -sudo $my_conf mysqld slow-query-log-file $slow_log
+        iniset -sudo $my_conf mysqld long-query-time 0
+        iniset -sudo $my_conf mysqld log-queries-not-using-indexes 1
+    fi
+    restart_service $mysql
+}
+
+function install_mariadb {
+    if [[ ! -e $HOME/.my.cnf ]]; then
+        cat <<EOF >$HOME/.my.cnf
+[client]
+user=$DATABASE_USER
+password=$DATABASE_PASSWORD
+host=$MYSQL_HOST
+EOF
+        chmod 0600 $HOME/.my.cnf
+    fi
+    if is_ubuntu; then
+        install_package mariadb-server
+    fi
+}
+
+function stop_mariadb {
+    stop_service mysql
+}
+

devstack/plugin.sh

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+#!/bin/bash
+
+# devstack/plugin.sh
+# Setup MariaDB as database backend for Devstack
+
+
+if is_service_enabled mysql && is_ubuntu; then
+
+    function cleanup_database_mysql {
+        cleanup_mariadb
+    }
+
+    function configure_database_mysql {
+        configure_mariadb
+    }
+
+    function install_database_mysql {
+        install_mariadb
+    }
+
+    if [[ "$1" == "stack" && "$2" == "install" ]]; then
+        echo_summary "Installing MariaDB"
+        install_mariadb
+    elif [[ "$1" == "stack" && "$2" == "pre-install" ]]; then
+        # nothing needed here
+        :
+    elif [[ "$1" == "stack" && "$2" == "post-config" ]]; then
+        echo_summary "Configuring MariaDB"
+        configure_mariadb
+    fi
+    if [[ "$1" == "unstack" ]]; then
+        echo_summary "Stopping MariaDB"
+        stop_mariadb
+    fi
+    if [[ "$1" == "clean" ]]; then
+        echo_summary "Removing MariaDB"
+        cleanup_mariadb
+    fi
+else
+    die $LINENO "MariaDB plugin requires mysql service enabled and ubuntu."
+fi
+
+## Local variables:
+## mode: shell-script
+## End:

devstack/settings

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+# MariaDB on Ubuntu uses unix_socket IPC for root auth (localhost!=127.0.0.1)
+DATABASE_USER=stack
+
+# MARIADB_PLUGIN_DIR contains the path to devstack-plugin-glusterfs/devstack directory
+MARIADB_PLUGIN_DIR=$(readlink -f $(dirname ${BASH_SOURCE[0]}))
+
+source $MARIADB_PLUGIN_DIR/lib/mariadb