Support #828
Updated by Daniel Curtis over 8 years ago
I recently needed to move two database services, PostgreSQL and MariaDB, from a Debian server on a VM to a FreeBSD jail. Since the database server on the VM was the database server for a few web services, I wanted as little downtime as possible. This is a guide on the process by which I migrated the two database services to the new server. *localdb.example.com* - current Debian VM database server *remotedb.example.com* - new FreeBSD jail database server h2. Prepare the New Server Start by installing and setting up the two database services in the new server. * Install and setup "PostgreSQL":https://project.altservice.com/issues/606 #* *NOTE*: Make sure to test connecting to the remote server: <pre> psql -h remotedb.example.com -U pgsql template1 </pre> #* *NOTE*: Make sure to have the following set in the pg_hba.conf file to allow passwordless connections by the admin to the database socket: <pre> # Database administrative login by Unix domain socket local all postgres trust # "local" is for Unix domain socket connections only local all all trust # IPv4 local connections: host all all 127.0.0.1/32 trust # IPv6 local connections: host all all ::1/128 trust </pre> * Install and setup "MariaDB":https://project.altservice.com/issues/788 #* *NOTE*: Make sure when setting up the MariaDB server to *Allow remote root login* during @mysql_secure_installation@. This will be disabled later. #* *NOTE*: Make sure to add the root database user on the remote server: <pre> CREATE USER 'root'@'localdb.example.com' IDENTIFIED BY 'SuperSecretPassword'; GRANT ALL PRIVILEGES ON *.* TO 'root'@'localdb.example.com'; FLUSH PRIVILEGES; quit </pre> #* *NOTE*: Make sure to test connecting to the remote server: <pre> mysql -h remotedb.example.com -uroot -p </pre> h2. Migrate the Databases * Migrate the local PostgreSQL databases, localdb.example.com, to the new remote server, remotedb.example.com: <pre> pg_dumpall -h localhost -U postgres | psql -h remotedb.example.com -U pgsql -W </pre> * Migrate the local MariaDB databases, localdb.example.com to the new remote server, remotedb.example.com: <pre> mysqldump --all-databases -uuser -ppassword | mysql -hremoteserver -uremoteuser -premoteserver </pre> h2. Resources * http://dba.stackexchange.com/questions/174/how-can-i-move-a-database-from-one-server-to-another * http://stackoverflow.com/questions/1237725/copying-postgresql-database-to-another-server * http://dba.stackexchange.com/questions/17740/how-to-get-a-working-and-complete-postgresql-db-backup-and-test * http://stackoverflow.com/questions/16618627/pg-dump-vs-pg-dumpall-which-one-to-use-to-database-backups * https://www.postgresql.org/docs/9.0/static/app-pg-dumpall.html