Published on November 14, 2008
Agnostic Database Replication... ...with Binary Logs www.mor.ph
Methodology • Constant Binary Log Replication • Phase I - Logging • Phase II - Archiving • Phase III - Recovery • Failover - What to do when disaster strikes! www.mor.ph
Methodology • Agnosticism? • The methodology described herein is not bound to one vendor’s DB • With proper scripting your code should be reusable for many vendors DB solutions • Non-Invasive • Drastically reduced downtime compared to traditional restore from backup methods www.mor.ph
Phase I - Logging www.mor.ph
Phase I - Logging • Set your DB server to create binary logs • Make logs a manageable size (<50MB) • To timeout or not to timeout? • Ensure time based sort-ability www.mor.ph
Phase I - Logging PostgreSQL Example ‣ postgresql.conf # allows archiving to be done archive_mode = on # command to use to archive a logﬁle segment archive_command = '/path/to/your/archiving/script %p' # force a logﬁle segment switch after this time archive_timeout = 60 ‣ Log naming 000000010000000000000000 000000010000000000000001 ... 00000001000000000000000f www.mor.ph
Phase I - Logging MySQL Example ‣ my.cnf # Where to store your binary logs log-bin=/var/log/mysql/bin/mysql-bin-log #Max size for each log segment max_binlog_size = 50MB ‣ Log naming mysql-bin-log.0001 mysql-bin-log.0002 ... www.mor.ph
Phase II - Archiving www.mor.ph
Phase II - Archiving • Ship logs to a reliable location • Ship logs regularly & often • Ensure ﬁle integrity • Do regular full dumps www.mor.ph
Phase III - Recovery www.mor.ph
Phase III - Recovery • Ship logs from your backup server • Ensure log ordering • Constant incremental recovery • Incremental Recovery is Replication www.mor.ph
Phase III - Recovery PostgreSQL Example ‣ recovery.conf restore_command = '/var/pgsql/bin/warm-standby-s3 /var/pgsql/tripﬁle /var/pgsql/backups/WAL/%f quot;%pquot;' www.mor.ph
Phase III - Recovery MySQL Example ‣ No built-in mechanism sudo -u mysql ./latest-dump-s3.pl | mysql -h localhost www.mor.ph
Failover - When disaster strikes! • “When” NOT “If” • Always assume your DB will go down • Have a failover plan A • Have a failover plan B • Best laid plan will fall to waste if you do not test/validate regularly www.mor.ph
Failover - When disaster strikes! • Ensure ﬁnal log segment recovery • Make your standby DB ‘active’ • Update client apps • Start the replication chain again! www.mor.ph
Warm Standby vs. Clustering • When to Cluster • Draw backs to clustering • The search for the holy 100% transparent clustering... www.mor.ph
Additional Resources • http://www.postgresql.org/docs/8.3/ interactive/wal.html • http://dev.mysql.com/doc/refman/6.0/en/ backup-and-recovery.html • http://dev.mysql.com/doc/refman/6.0/en/ point-in-time-recovery.html • http://dev.mysql.com/doc/refman/6.0/en/ backup.html www.mor.ph
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