Documentation for replication setup

README.md

@@ -33,3 +33,18 @@ drupal_settings:
             - cache*
             - access*
 ```
+
+# Replcation
+
+- [Replication Configuration](https://dev.mysql.com/doc/refman/5.7/en/replication.html)
+- [Replication SQL Statements](https://dev.mysql.com/doc/refman/5.7/en/sql-replication-statements.html)
+
+## Setting up a new replication
+
+Starting from [here](https://dev.mysql.com/doc/refman/5.7/en/replication-howto-masterstatus.html) there are basically these steps:
+
+- Create a DB dump: lock tables, remember bin log position, dump db (see [Choosing a Method for Data Snapshots](https://dev.mysql.com/doc/refman/5.7/en/replication-snapshot-method.html)) and copy to secondary host
+- Unlock the tables again
+- Configure secondary for new master with Ansible playbook `dans COMPANY mysqlsecondary --tags=changemaster --extra-vars="port=[PORT]" --extra-vars="binpos=[BINLOGPOS]"`
+- On the secondary, start the MySQL server and turn off replication (`stop slave`)
+- Import dump file and then start replication again (`start slave`)