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134 lines
3.7 KiB
134 lines
3.7 KiB
#!/bin/bash
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# forksand-mariadb-setup
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#
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# Script template for setting up MySQL compatible MariaDB Cluster
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# on four nodes: sql1 sql2 sql3 sql4
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#
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# https://mariadb.com/kb/en/library/getting-started-with-mariadb-galera-cluster/
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#
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# Get repo mirror:
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# https://downloads.mariadb.org/mariadb/repositories
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exit 0
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# As root
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apt-get install software-properties-common dirmngr
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apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xF1656F24C74CD1D8
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add-apt-repository 'deb [arch=amd64] http://sfo1.mirrors.digitalocean.com/mariadb/repo/10.3/debian stretch main'
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apt-get update
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apt-get install mariadb-server
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apt-get clean
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# Set config like here:
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# https://mariadb.org/installing-mariadb-galera-cluster-on-debian-ubuntu/
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# /etc/mysql/my.cnf
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# =================================================
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[galera]
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# Mandatory settings
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wsrep_on=ON
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wsrep_provider=/usr/lib/galera/libgalera_smm.so
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wsrep_cluster_address="gcomm://10.42.1.171,10.42.1.172,10.42.1.173,10.42.1.174"
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wsrep_cluster_name="XXX"
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binlog_format=row
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default_storage_engine=InnoDB
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innodb_autoinc_lock_mode=2
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wsrep_sst_method=rsync
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query_cache_size=0
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query_cache_type=0
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#
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# Allow server to accept connections on all interfaces.
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#
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bind-address=10.42.1.174
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#
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# Optional setting
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#wsrep_slave_threads=1
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#innodb_flush_log_at_trx_commit=0
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# =================================================
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service mysql stop
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# on just sql1:
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galera_new_cluster
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# See if the cluster node comes up:
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mysql -p -u root -e 'SELECT VARIABLE_VALUE as "cluster size" FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME="wsrep_cluster_size"'
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# Start another node, sql2:
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service mysql start
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# See if it came up:
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mysql -p -u root -e 'SELECT VARIABLE_VALUE as "cluster size" FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME="wsrep_cluster_size"'
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# Then do sql3 sql4
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service mysql start
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# See if it came up:
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mysql -p -u root -e 'SELECT VARIABLE_VALUE as "cluster size" FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME="wsrep_cluster_size"'
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###############################################
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# run this to lock down:
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mysql_secure_installation
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###########################################
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# If all cluster nodes get shutdown at the same time, the cluster needs to be boot strapped again.
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# On just one node, the most advanced, if known (e.g. sql1):
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galera_new_cluster
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# On other nodes sql2 sql3 sql4
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service mysql start
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# Maybe need on most advanced node:
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# sed -i -e 's/safe_to_bootstrap: 0/safe_to_bootstrap: 1/g' /var/lib/mysql/grastate.dat
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##########################
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# haproxy
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# for code.forksand.com, insert on sql1 (or any of them):
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# http://galeracluster.com/documentation-webpages/haproxy.html
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USE mysql;
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# This fails. Not a good way to create users either.
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CREATE USER 'haproxy'@'10.42.1.163' IDENTIFIED BY 'password';
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FLUSH PRIVILEGES;
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SHOW GRANTS FOR 'haproxy'@'10.42.1.163';
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# pen proxy instead of haproxy
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# To run manually:
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pen -l pen.log -p pen.pid localhost:3306 10.42.1.171:3306 10.42.1.172:3306 10.42.1.173:3306 10.42.1.174:3306
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useradd pen
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echo "d /var/run/pen 0755 pen pen -" > /etc/tmpfiles.d/pen.conf
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systemd-tmpfiles --create
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mkdir -p /etc/pen
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cat > /etc/pen/galera.cfg <<EOF
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server 0 address 10.42.1.171 port 3306
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server 2 address 10.42.1.172 port 3306
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server 3 address 10.42.1.173 port 3306
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server 4 address 10.42.1.174 port 3306
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debug 1
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EOF
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cat > /lib/systemd/system/pen-galera.service <<EOF
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[Unit]
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Description=Pen load balancer (galera)
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After=network.target
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[Service]
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User=pen
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Type=forking
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PIDFile=/var/run/pen/galera.pid
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ExecStart=/usr/bin/pen -u pen -C /var/run/pen/galera.ctl -F /etc/pen/galera.cfg -p /var/run/pen/galera.pid 127.0.0.1:3306
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Restart=on-failure
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[Install]
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WantedBy=multi-user.target
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EOF
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systemctl restart pen-galera
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systemctl enable pen-galera.service
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