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Install iRedMail with a remote MySQL server

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Summary

This article describes how to install iRedMail (iRedMail-0.8.6 or later releases) with a remote MySQL server, and you must choose MySQL backend in iRedMail installation wizard.

We use below server IP addresses in our example:

192.168.1.100: Remote MySQL server.
192.168.1.200: iRedMail server. We're going to install the latest iRedMail on this server.

iRedMail won't install MySQL server (RPM/DEB package) on localhost with remote MySQL server, but MySQL client tools are still required for remote connection.

Requirements

In our case, remote MySQL server runs on server 192.168.1.100. It must accept remote connection from iRedMail server BEFORE installing iRedMail, and we must create a new SQL user with password and proper privileges for remote login from iRedMail server (192.168.1.200 in our case).

Make sure your remote MySQL server accepts remote connection from iRedMail server. For example, you can check it with command netstat:

# netstat -ntlp | grep 3306
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      2479/mysqld

If MySQL server is listening on only 127.0.0.1, you should comment out bind-address parameter in MySQL config file my.cnf to make it listen on all available network interfaces, and restart MySQL service.

On Red Hat Enterprise Linux, CentOS, openSUSE, OpenBSD, it's /etc/my.cnf.
On Debian, Ubuntu, it's /etc/mysql/my.cnf.
On FreeBSD, it's /var/db/mysql/my.cnf.

#bind-address = 127.0.0.1

Make sure remote MySQL request will not be blocked by network firewall like iptables (Linux), ipfw (FreeBSD) or PF (OpenBSD).
Create a new SQL user (admin_iredmail) with new password (admin_password) and all privileges on remote MySQL server (of course you must choose another strong password):

mysql> GRANT ALL PRIVILEGES ON *.* TO 'admin_iredmail'@'192.168.1.200' IDENTIFIED BY 'admin_password' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;
mysql> FLUSH HOSTS;

With above commands, MySQL user admin_iredmail is allowed to connect from IP address 192.168.1.200 with password admin_password.

Notes:

WITH GRANT OPTION in above SQL command is required.
Of course you can use root or other MySQL user as remote MySQL user name in above SQL command, but a custom user name should be better to help you understand what it's used for, and less confuse with default root user.
You must replace 192.168.1.200 by the real IP address of your iRedMail server in above command.
It's recommended to delete this user AFTER iRedMail installation, it won't be used anymore. We will give you SQL command to delete it later.

If you tried to install iRedMail with this remote MySQL server before, please backup existing databases on remote MySQL server first, then drop them and delete related MySQL users, because they will be created by iRedMail automatically on remote MySQL server:

mysql> DROP DATABASE amavisd;
mysql> DROP DATABASE cluebringer;
mysql> DROP DATABASE iredadmin;
mysql> DROP DATABASE roundcubemail;
mysql> DROP DATABASE sogo;
mysql> DROP DATABASE vmail;

mysql> DROP USER 'amavisd'@'192.168.1.200';
mysql> DROP USER 'cluebringer'@'192.168.1.200';
mysql> DROP USER 'iredadmin'@'192.168.1.200';
mysql> DROP USER 'roundcube'@'192.168.1.200';
mysql> DROP USER 'sogo'@'192.168.1.200';
mysql> DROP USER 'vmail'@'192.168.1.200';
mysql> DROP USER 'vmailadmin'@'192.168.1.200';

Install iRedMail

Please follow iRedMail installation guide strictly, but start iRedMail installer with below command instead of the original one (bash iRedMail.sh):

WARNING:

The variable names (MYSQL_SERVER_ADDRESS, MYSQL_SERVER_PORT, MYSQL_ROOT_USER, MYSQL_GRANT_HOST) are CASE SENSITIVE.

With iRedMail-0.9.2 and earlier releases, it's MYSQL_SERVER, not MYSQL_SERVER_ADDRESS.

# MYSQL_SERVER_ADDRESS='192.168.1.100' MYSQL_SERVER_PORT='3306' MYSQL_ROOT_USER='admin_iredmail' MYSQL_ROOT_PASSWD='admin_password' MYSQL_GRANT_HOST='192.168.1.200' bash iRedMail.sh

It will launch iRedMail installation wizard as usual.

Parameters we used in above command line:

MYSQL_SERVER_ADDRESS: Remote MySQL server address.
MYSQL_SERVER_PORT: Remote MySQL server port. Default is 3306.
MYSQL_ROOT_USER: MySQL user name we created on remote MySQL server before installing iRedMail.
MYSQL_ROOT_PASSWD: MySQL password that we created on remote MySQL server before installing iRedMail.
MYSQL_GRANT_HOST: Hostname or IP address of iRedMail server.

iRedMail will create new SQL users for applications like Postfix, Amavisd, Roundcube webmail, etc, and grant proper privileges to them which will connect from iRedMail server.

One more optional parameter is MYSQL_SERVER_PORT. it specifies listen port of remote MySQL server. Default one is 3306, you can change it if remote MySQL server is running on a different port.

After iRedMail installation

As mentioned above, it's now ok to delete the new MySQL user admin_iredmail on remote MySQL server. It will not be used anymore.

mysql> DROP USER 'admin_iredmail'@'192.168.1.200';

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