Improve Galera configuration for clustering
Debian only. The problem here is that the first time the galera is started it must be done with some specific option, ie "--wsrep-new-cluster". Then it shouldn't be used anymore. This has to be used only on one node or else all nodes become master. To achieve this behaviour a specific mysql init script is installed: mysql-bootstrap. This script check if the galera has started and, if it's not the case, it adds wsrep-new-cluster to the command line. Then in puppet I change the service name for mysql to mysql-bootstrap on one node. The port to RHEL could take the same road. The only requirement is that: $ strings `which mysqld` | grep wsrep-new-cluster be true. I don't add the close 11 to it as the rhel support should come with it I think. issue #11
This commit is contained in:
sathlan
@@ -15,12 +15,15 @@
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#
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# MySQL Galera Node
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#
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# === Parameters
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#
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# [*galera_internal_ips*]
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# Array of internal ip of the galera nodes.
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class cloud::database::sql (
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$api_eth = $os_params::api_eth,
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$service_provider = 'sysv',
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$galera_nextserver = $os_params::galera_nextserver,
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$galera_master_name = $os_params::galera_master_name,
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$galera_internal_ips = $os_params::galera_internal_ips,
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$keystone_db_host = $os_params::keystone_db_host,
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$keystone_db_user = $os_params::keystone_db_user,
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$keystone_db_password = $os_params::keystone_db_password,
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@@ -90,16 +93,26 @@ class cloud::database::sql (
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}
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}
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class { 'mysql::server':
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config_hash => {
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bind_address => $api_eth,
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root_password => $mysql_root_password,
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},
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notify => Service['xinetd'],
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if($::osfamily == 'Debian'){
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class { 'cloud::debian::galera_patch' : }
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}
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$gcomm_base = inline_template('<%= @galera_internal_ips.join(",") + "?pc.wait_prim=no" -%>')
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if $::hostname == $galera_master_name {
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class { 'mysql::server':
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config_hash => {
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bind_address => $api_eth,
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root_password => $mysql_root_password,
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service_name => 'mysql-bootstrap',
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},
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notify => Service['xinetd'],
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}
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$gcomm_definition = "${gcomm_base}&pc.bootstrap=1"
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# OpenStack DB
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class { 'keystone::db::mysql':
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dbname => 'keystone',
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@@ -175,8 +188,18 @@ class cloud::database::sql (
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}
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Database_user<<| |>>
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} else {
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$gcomm_definition = $gcomm_base
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} # if $::hostname == $galera_master_name
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class { 'mysql::server':
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config_hash => {
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bind_address => $api_eth,
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root_password => $mysql_root_password,
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service_name => 'mysql',
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},
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notify => Service['xinetd'],
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}
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} # if $::hostname == $galera_master
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# Haproxy http monitoring
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file_line { 'mysqlchk-in-etc-services':
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45
manifests/debian/galera_patch.pp
Normal file
45
manifests/debian/galera_patch.pp
Normal file
@@ -0,0 +1,45 @@
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#
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# Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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# == Class: cloud::debian::galera_patch
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#
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# Install a dedicated mysqld init script
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#
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# This is due to this bug: https://bugs.launchpad.net/codership-mysql/+bug/1087368
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#
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# The backport to API 23 requires a command line option --wsrep-new-cluster:
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#
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# http://bazaar.launchpad.net/~codership/codership-mysql/wsrep-5.5/revision/3844?start_revid=3844
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#
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# and the mysql init script cannot have arguments passed to the daemon
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# using /etc/default/mysql standart mechanism
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#
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# To check that the mysqld support the options you can :
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# strings `which mysqld` | grep wsrep-new-cluster
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#
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# TODO: to be remove as soon as the API 25 is packaged, ie galera 3 ...
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class cloud::debian::galera_patch (
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) {
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# replace the file
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file { '/etc/init.d/mysql-bootstrap':
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content => template('cloud/database/etc_initd_mysql'),
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owner => 'root',
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mode => '0755',
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group => 'root',
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notify => Service['mysqld'],
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before => Package['mysql-server'],
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}
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}
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200
templates/database/etc_initd_mysql
Executable file
200
templates/database/etc_initd_mysql
Executable file
@@ -0,0 +1,200 @@
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#!/bin/bash
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#
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### BEGIN INIT INFO
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# Provides: mysql
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# Required-Start: $remote_fs $syslog
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# Required-Stop: $remote_fs $syslog
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# Should-Start: $network $named $time
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# Should-Stop: $network $named $time
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: Start and stop the mysql database server daemon
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# Description: Controls the main MariaDB database server daemon "mysqld"
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# and its wrapper script "mysqld_safe".
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### END INIT INFO
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#
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MYSQLD_STARTUP_TIMEOUT=${MYSQLD_STARTUP_TIMEOUT:-60}
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[ -e /etc/mysql/my.cnf ] && \
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MYSQLD_DATA_DIR=$(awk -F= '/^datadir/{print $2}' /etc/mysql/my.cnf | sed -e 's/^ *//')
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MYSQLD_DATA_DIR=${MYSQLD_DATA_DIR:-<%= scope.lookupvar('::mysql::datadir') %>}
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set -e
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set -u
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${DEBIAN_SCRIPT_DEBUG:+ set -v -x}
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test -x /usr/sbin/mysqld || exit 0
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. /lib/lsb/init-functions
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SELF=$(cd $(dirname $0); pwd -P)/$(basename $0)
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CONF=/etc/mysql/my.cnf
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MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"
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# priority can be overriden and "-s" adds output to stderr
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ERR_LOGGER="logger -p daemon.err -t /etc/init.d/mysql -i"
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# Safeguard (relative paths, core dumps..)
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cd /
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umask 077
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# mysqladmin likes to read /root/.my.cnf. This is usually not what I want
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# as many admins e.g. only store a password without a username there and
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# so break my scripts.
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export HOME=/etc/mysql/
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## Fetch a particular option from mysql's invocation.
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#
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# Usage: void mysqld_get_param option
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mysqld_get_param() {
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/usr/sbin/mysqld --print-defaults \
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| tr " " "\n" \
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| grep -- "--$1" \
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| tail -n 1 \
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| cut -d= -f2
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}
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## Do some sanity checks before even trying to start mysqld.
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sanity_checks() {
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# check for config file
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if [ ! -r /etc/mysql/my.cnf ]; then
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log_warning_msg "$0: WARNING: /etc/mysql/my.cnf cannot be read. See README.Debian.gz"
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echo "WARNING: /etc/mysql/my.cnf cannot be read. See README.Debian.gz" | $ERR_LOGGER
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fi
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# check for diskspace shortage
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datadir=`mysqld_get_param datadir`
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if LC_ALL=C BLOCKSIZE= df --portability $datadir/. | tail -n 1 | awk '{ exit ($4>4096) }'; then
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log_failure_msg "$0: ERROR: The partition with $datadir is too full!"
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echo "ERROR: The partition with $datadir is too full!" | $ERR_LOGGER
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exit 1
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fi
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}
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## Checks if there is a server running and if so if it is accessible.
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#
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# check_alive insists on a pingable server
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# check_dead also fails if there is a lost mysqld in the process list
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#
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# Usage: boolean mysqld_status [check_alive|check_dead] [warn|nowarn]
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mysqld_status () {
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ping_output=`$MYADMIN ping 2>&1`; ping_alive=$(( ! $? ))
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ps_alive=0
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pidfile=`mysqld_get_param pid-file`
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if [ -f "$pidfile" ] && ps `cat $pidfile` >/dev/null 2>&1; then ps_alive=1; fi
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if [ "$1" = "check_alive" -a $ping_alive = 1 ] ||
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[ "$1" = "check_dead" -a $ping_alive = 0 -a $ps_alive = 0 ]; then
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return 0 # EXIT_SUCCESS
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else
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if [ "$2" = "warn" ]; then
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echo -e "$ps_alive processes alive and '$MYADMIN ping' resulted in\n$ping_output\n" | $ERR_LOGGER -p daemon.debug
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fi
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return 1 # EXIT_FAILURE
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fi
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}
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#
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# main()
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#
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case "${1:-''}" in
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'start')
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sanity_checks;
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# Start daemon
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log_daemon_msg "Starting MariaDB database server" "mysqld"
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if mysqld_status check_alive nowarn; then
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log_progress_msg "already running"
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log_end_msg 0
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else
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# Could be removed during boot
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test -e /var/run/mysqld || install -m 755 -o mysql -g root -d /var/run/mysqld
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# Start MariaDB! in a Galera setup we want to use
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# new-cluster only when the galera cluster hasn't been
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# bootstraped
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if [ -e ${MYSQLD_DATA_DIR}/grastate.dat ]; then
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# normal boot
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/usr/bin/mysqld_safe "${@:2}" > /dev/null 2>&1 &
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else
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# bootstrap boot
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log_progress_msg " (Galera bootstrap) "
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/usr/bin/mysqld_safe "${@:2}" --wsrep-new-cluster > /dev/null 2>&1 &
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fi
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# 6s was reported in #352070 to be too few when using ndbcluster
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for i in $(seq 1 "${MYSQLD_STARTUP_TIMEOUT:-30}"); do
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sleep 1
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if mysqld_status check_alive nowarn ; then break; fi
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log_progress_msg "."
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done
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if mysqld_status check_alive warn; then
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log_end_msg 0
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# Now start mysqlcheck or whatever the admin wants.
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output=$(/etc/mysql/debian-start)
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[ -n "$output" ] && log_action_msg "$output"
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else
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log_end_msg 1
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log_failure_msg "Please take a look at the syslog"
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fi
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fi
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;;
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'stop')
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# * As a passwordless mysqladmin (e.g. via ~/.my.cnf) must be possible
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# at least for cron, we can rely on it here, too. (although we have
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# to specify it explicit as e.g. sudo environments points to the normal
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# users home and not /root)
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log_daemon_msg "Stopping MariaDB database server" "mysqld"
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if ! mysqld_status check_dead nowarn; then
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set +e
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shutdown_out=`$MYADMIN shutdown 2>&1`; r=$?
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set -e
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if [ "$r" -ne 0 ]; then
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log_end_msg 1
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[ "$VERBOSE" != "no" ] && log_failure_msg "Error: $shutdown_out"
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log_daemon_msg "Killing MariaDB database server by signal" "mysqld"
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killall -15 mysqld
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server_down=
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for i in `seq 1 600`; do
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sleep 1
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if mysqld_status check_dead nowarn; then server_down=1; break; fi
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done
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if test -z "$server_down"; then killall -9 mysqld; fi
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fi
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fi
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if ! mysqld_status check_dead warn; then
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log_end_msg 1
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log_failure_msg "Please stop MariaDB manually and read /usr/share/doc/mariadb-server-5.5/README.Debian.gz!"
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exit -1
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else
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log_end_msg 0
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fi
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;;
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'restart')
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set +e; $SELF stop; set -e
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$SELF start
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;;
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'reload'|'force-reload')
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log_daemon_msg "Reloading MariaDB database server" "mysqld"
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$MYADMIN reload
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log_end_msg 0
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;;
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'status')
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if mysqld_status check_alive nowarn; then
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log_action_msg "$($MYADMIN version)"
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else
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log_action_msg "MariaDB is stopped."
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exit 3
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fi
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;;
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*)
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echo "Usage: $SELF start|stop|restart|reload|force-reload|status"
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exit 1
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;;
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esac
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@@ -42,14 +42,8 @@ innodb_autoinc_lock_mode = 2
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innodb_locks_unsafe_for_binlog = 1
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wsrep_provider = "<%= @wsrep_provider %>"
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wsrep_cluster_name = "galera_cluster"
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<% if @hostname != @galera_master_name -%>
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# This node is not Galera Master (connect wsrep to galera_master_name)
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wsrep_cluster_address = "gcomm://<%= @galera_nextserver[0] %>"
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<% else -%>
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# This node is Galera Master (connect wsrep to localhost)
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wsrep_cluster_address = "gcomm://"
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<% end -%>
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wsrep_sst_auth = root:<%= @mysql_password %>
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wsrep_cluster_address = "gcomm://<%= @gcomm_definition %>"
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wsrep_sst_auth = root:<%= @mysql_root_password %>
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wsrep_certify_nonPK = 1
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wsrep_convert_LOCK_to_trx = 0
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wsrep_auto_increment_control = 1
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