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[[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Email server configuration]] > [[Migrating mail server from one machine to another]]

Sometimes it might be necessary to migrate email server from one machine to another.  For example in case of AWS the mail server may need migration to increase space in /home or for increasing RAM. 

Following steps can be used for migrating a running mail server setup using [[Configuring basic SMTP, IMAP, POP and HTTP access for complete email on a single server]]:
# Create a new VM with necessary resources
# Add elastic IP to instance if not done already
# yum -y install epel-release vim
# Mount partition to /home as desired
# Copy keys from old server to new server as authorized
# Add /etc/hosts entry in old server for pointing to new server with name
# yum -y install httpd mod_ssl 
# service iptables stop
# Copy /etc/sysconfig/iptables from old to new.  Do not restart firewall.  Only copy the file.
# Copy /etc/httpd/conf/httpd.conf, /etc/httpd/conf.d/ssl.conf and old SSL certificates to new server
# If [[Installing lets-encrypt SSL certificate]] was used copy /etc/letsencrypt from old sever to new server.  Also install python2-certbot-apache on new server.  Also copy crontab configuration (crontab -l on old server, crontab -e on new server).
# service httpd start
# chkconfig httpd on
# copy /home
# copy /etc/passwd, /etc/shadow, /etc/group
# copy /etc/aliases and update root alias appropriately
# run newaliases
# install logwatch
# ensure that posfix is installed
# Copy /etc/postfix/ folder from old server to new server
# chkconfig postfix on
# Set hostname in /etc/sysconfig/network
# Add hostname against 127.0.0.1 in /etc/hosts
# hostname <FQDN>
# service postfix restart
# yum -y install dovecot
# Copy /etc/dovecot/conf.d/10-mail.conf from old server to new server
# Copy /etc/dovecot/conf.d/10-master.conf from old server to new server
# service dovecot start
# chkconfig dovecot on
# yum -y install wget
# yum -y install epel-release
# yum -y install squirrelmail
# Disable selinux (setenforce 0, edit /etc/sysconfig/selinux and set SELINUX=disabled)
# rsync /etc/squirrelmail contents from old server to new server
# rsync /usr/share/squirrelmail/plugins/ from old server to new server
# rsync /var/www/html from old server to new server
# service httpd restart
# Add /etc/hosts entry for new server in laptop and try to open the new server with name and IP.
# Enable firewall on old server for blocking http(80,443), IMAP, POP3, STMP, etc.  Leave only SSH access. 
# Again sync /home
# Change DNS entries to point to new server.  If organization has local private DNS, then perhaps that may also require changes.
# Check updated entries via public DNS servers after waiting for a minute or two
# Copy /root/.ssh/authorized_keys from old server to new server
# Comment /etc/host entry in laptop after DNS entry has been changed
# service iptables restart on new server
# Apply security group settings from old server to new server (HTTP, HTTPS, POP3, POP3S, SMTP, SMTPS, IMAP, IMAPS, SSH, Ping)
# Send test email from gmail to server and wait for receiving email on new server
# Send test email from new server to gmail and wait for receiving email on Gmail account
# stop and possibly terminate old server after few days.  Elastic IP of old server can be released immediately after stopping.




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