Make single Roundcube instance use multi different databases

I had to configure webmail service with Roundcube which would allow connecting multi mail servers o one platform. Every mail server had it’s own Roundcube instance already, but idea was, that only one installation can handle all mail servers.

I found out, that this can be done pretty symple with some php in roundcube configuration.

Open your roundcube configuration file, for example:

vi /var/www/roundcube/config/config.inc.php

Fetch correct hostname for specific webmail instance in php variable.

$host = $_SERVER['SERVER_NAME'];

Then you should create switch statement that will be able to manage correct database connection and host for specific server name – mail service. You can also have different types of database. For example mysql and postgres.

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Migrate all databases to remote server with mysqldump in one step – 1:1 migration

Here is quick one, last in this year :). So I had to move a lot of databases to another server, but problem was, that on source server there wasn’t enough disk available. Also it was migration from very old mysql version to mariadb so mysqldump is your friend. Mysqldump all databases was out of the question because of low disk space. Dumping each database on its own would take too long and too many effort. But you can create dump of database and import it on new server in the same step.

First, you’ll need list of all databases on your source server and create them on new server. If your mysqldump creates “create database”, then you don’t need to create them manually on new server. If you want, you can skip mysql and any other databases that you don’t wish to transfer with grep. Put list of databases in some file – databases.txt for example. But first, make shure that command bellow show all databases. It is also necessary that you can remote access to mysql from source server to new server.

Test list all databases (exclude unwanted ones):

[root@oldserver ~]# mysql -e 'show databases' | grep -v "|" | grep -v "Database\|information_schema\|mysql\|performance_schema"
database1
geekytuts
database2
database3
database4
database5

Then put list of databases in text file databasest.txt:

[root@oldserver ~]# mysql -e 'show databases' | grep -v "|" | grep -v "Database\|information_schema\|mysql\|performance_schema" > databases.txt

Then you can import database to remote server like this:

mysqldump -u root -ppassword --single-transaction --skip-lock-tables database1 | mysql -h 1.1.1.1 -u root -ppassword database1

If you want to import all/multi databases, then use database.txt that we created in first step with for loop:

for i in `cat databases.txt`; do mysqldump -u root -ppassword --single-transaction --skip-lock-tables $i | mysql -h 1.1.1.1 -u root -ppassword $i; done

Bonus: If you need to create all databases listed in databases.txt on new server manualy, then you can also create all of them in one step. Use databases.txt on new server. If your mysqldump creates “create database” also, then you can skip this step.

[root@newserver ~]# for i in `cat databases.txt`; do mysql -u root -ppassword -e create database $i; done

Hope this helps someone.

Happy new year!

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