CentOs 8.x Migrate commonhosting from one machine to another

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Initialize machine

To migrate commonhosting from one machine (eg VM) to another use following steps:

1. Create a new VM with static IP (IPv4 and IPv6)
2. Enable following ports in cloud firewall: 22, 25, 80, 443, 465 and 8080 for both IPv4 and IPv6
3. ssh to VM using public key
4. Install vim

   sudo su -
   dnf -y install epel-release vim
   dnf -y install byobu rsync bzip2 tar gdisk

5. Allow direct root access via personal key by editing '~/.ssh/authorized_keys'
6. Upgrade OS to CentOS-8-Stream, if launched with CentOS 8

   dnf -y swap centos-linux-repos centos-stream-repos
   dnf -y distro-sync

7. Add swap space using CentOS 7.x adding swap space using file
8. Add history date/time recording using Storing date / time along with commands in history
9. set desired hostname using:

   hostnamectl set-hostname <new-hostname>

10. Set correct time zone CentOS 8.x Change system timezone
11. Disable SELinux (setenforce 0, edit /etc/sysconfig/selinux and set SELINUX=disabled)
12. Fully update system, if not done already

    dnf -y update --skip-broken

13. Reboot the machine

    shutdown -r now

Configure access to both old and new machines

1. Connect to machine using personal key directly as root
2. Create /etc/hosts entry on personal laptop for
   • old-commonhosting pointing to old-commonhosting server
   • new-commonhosting pointing to new-commonhosting server
3. Create /etc/hosts entry on old-commonhosting server for
   • new-commonhosting
4. Run following to generate ssh-keys (on old-commonhosting server)

   hostnamectl set-hostname old-commonhosting
   ssh-keygen

5. Copy keys from old-commonhosting to new-commonhosting as authorized.
   • Also copy keys of rekallcm1 backup to new-commonhosting VM
6. Test key based ssh from to new-commonhosting (on old-commonhosting server)

   ssh root@new-commonhosting

7. Start copying home folder from old server to new server: (on old-commonhosting server)

   rsync -aHz --delete /home/ root@new-commonhosting:/home/

Configure firewalld, fail2ban and lets-encrypt on new server

1. Install firewalld using: (on new-commonhosting server)

   dnf -y install firewalld
   #In /etc/sysconfig/network-scripts/ifcfg-eth0 append ZONE=public
   nmcli networking off; nmcli networking on
   systemctl restart firewalld
   systemctl enable firewalld
   
   firewall-cmd --zone=public --add-port=25/tcp --permanent  #SMTP
   firewall-cmd --zone=public --add-port=80/tcp --permanent  #HTTP
   firewall-cmd --zone=public --add-port=443/tcp --permanent #HTTPS
   firewall-cmd --zone=public --add-port=465/tcp --permanent #SMTPS
   firewall-cmd --zone=public --add-port=8080/tcp --permanent #Alt-HTTP
   firewall-cmd --reload
   firewall-cmd --list-all

2. Install and configure fail2ban by referring CentOS 7.x fail2ban (on new-commonhosting server)
3. Migreate lets-encrypt data from old to new
   1. Copy letsencrypt data from old server to new using: (On old server)

      rsync -a /etc/letsencrypt/ root@new-commonhosting:/etc/letsencrypt/

   2. Install certbot on new server using: (On new server)

      dnf -y install certbot python3-certbot-apache

   3. Check cron configuration on old server (On old server)

      crontab -l

   4. Configure cron entries for automatic SSL renewal same as old server on new server using crontab -e (On new server)

      crontab -e

Configure apache, user accounts and postfix on new server

1. Install apache on new server (on-new server)

   dnf -y install httpd mod_ssl php php-pdo php-mbstring php-xml php-json php-cli php-mysqlnd

2. copy apache config from old to new (on-old server)

   rsync -aHz /etc/httpd/ root@new-commonhosting:/etc/httpd/
   rsync -a /etc/php.ini root@new-commonhosting:/etc/php.ini

3. Copy user account information from old server to new
   1. cat /etc/passwd
   2. Copy all lines for UID >=500 and append corresponding lines to /etc/passwd on new server.
      • The number of lines should match 'ls -1 /home | grep -v lost | wc -l'
      • Be watchful for IDs <500 which might appear in between (eg nscd, dovecot)
      • Only two users would match (ecc, sbarjatiya)

        ecc:x:501:501::/home/ecc:/bin/bash
        sbarjatiya:x:500:500::/home/sbarjatiya:/bin/bash

   3. Copy /etc/shadow lines of corresponding users from old server to new server
   4. Copy /etc/group lines of corresponding users from old server to new server
   5. Do ls -l /home and all user and group names should appear properly (On new server)
      • The output should match old server. Only ecc, centos, sbarjatiya would appear properly
4. Install postfix and configure aliases (On new server)

   dnf -y install logwatch postfix postfix-pcre
   dnf -y install bind-utils telnet nc

5. Copy custom aliases from /etc/aliases to new server and update root alias appropriately
   • root to saurabh [at] rekallsoftware.com
6. newaliases
7. In /etc/hosts add new-commonhosting commonhosting against 127.0.0.1
8. dnf -y install wget
9. Copy postfix data from old server to new server (On old server)

   rsync -a /etc/postfix/ root@new-commonhosting:/etc/postfix/

10. Start and enable services (on new server)

    systemctl enable postfix
    systemctl start postfix
    systemctl status postfix
    
    cd /etc/httpd/conf.d/
    mv -f ssl.conf old-ssl-conf
    systemctl enable httpd
    systemctl start httpd
    systemctl status httpd

11. Add /etc/hosts entry for sbarjatiya.com www.sbarjatiya.com pointing to new server (In admin machine)
    • Open https://www.sbarjatiya.com/ and it should open properly.
    • Open https://www.sbarjatiya.com/notes_wiki and it should fail to open due to missing DB

Configure mariadb

1. Install mariadb and restore mariadb database from old server to new

   dnf -y install mariadb mariadb-server
   
   systemctl enable mariadb
   systemctl start mariadb
   systemctl status mariadb
   
   mysql_secure_installation   #Avoid setting root password
   
   cd /home/sbarjatiya/public_html_ssqdws
   cat import*
   
   mysql
   > create database notes_wiki;
   > grant all on notes_wiki.* to notes_wiki@'localhost' identified by '<secret>';  #Secret is part of cat output
   > flush privileges;
   > \q
   
   dnf -y install sshpass
   ./import_*.sh

2. Again try to open https://www.sbarjatiya.com/notes_wiki/
   • This time it should open properly
3. Install erlang for erlangcentral.com

   dnf -y install erlang
   cd
   wget http://yaws.hyber.org/download/yaws-2.0.6.tar.gz  #Or more updated version
   tar xzf yaws-2.0.6.tar.gz
   dnf -y install gcc autoconf automake pam-devel make
   cd yaws-2.0.6
   ./configure
   make
   make install

4. Fix yaws interpreter by validating path and recompiling erlang code with current compiler

   su - sbarjatiya
   cd erlang/erlangcentral.com
   vim start_yaws.sh
   # Validate hostname commonhosting for path /home/sbarjatiya/erlang/erlangcentral.com
   ./start_yaws.sh
   sleep 5
   yaws --ls
   cd /home/sbarjatiya/erlang/applications/interpreter
   erlc *.erl
   
   cd
   cd erlang/applications/interpreter/
   yaws --ls
   yaws --stop --id application
   rm -rf Mnesia.nonode\@nohost/
   cd ../../erlangcentral.com/
   rm -rf Mnesia.yaws\@*
   cd sasl_error_logs/
   rm -f *
   cd ..
   
   vim start_applications.erl
   #Validate "commonhosting" -> code:add_patha("/home/sbarjatiya/erlang/applications/interpreter");
   
   erlc start_applications.erl
   ./start_yaws.sh
   sleep 5
   yaws --ls

DNS changes and finalize migration

1. DNS entry updation
   1. Change production public DNS entries to point to new server. If organization has local private DNS, then perhaps that may also require changes.
      • sbarjatiya.com - @ - IPv4 and IPv6
      • erlangcentral.com - @ - IPv4 and IPv6
      • pbarjatiya.com - @ - IPv4 and IPv6
      • energyconservationclub.in - @ - IPv4 and IPv6
      • rekallsoftwarae.com - @ -
   2. Check updated entries via public DNS servers after waiting for a minute or two
   3. Manually copy entries from /root/.ssh/authorized_keys of old server to new server (root@rekallcm1 for backup)
      • From rekallcm1 ensure that following work

        ssh root@sbarjatiya.com  #As saurabh user
        cd /documents/public_html; ./update.sh  #As saurabh user
        ssh root@sbarjatiya.com  #As root user for rsnapshot backups

   4. Comment /etc/hosts entry in laptop after DNS entry has been changed (sbarjatiya.com, www.sbarjatiya.com)
2. Shutdown old server and test following sites
   • https://www.sbarjatiya.com/
   • https://www.sbarjatiya.com/notes_wiki/index.php/Main_Page
   • https://pbarjatiya.com/
   • https://erlangcentral.com/
   • https://energyconservationclub.in/website/
   • https://rekallsoftware.com/
3. In case of Linode:
   • Create rDNS entry for mail.sbarjatiya.com to linode IPv4 and IPv6 IPs
   • As per https://www.linode.com/docs/email/running-a-mail-server/#sending-email-on-linode open support ticket using https://cloud.linode.com/support/tickets?type=closed&drawerOpen=true for removing outgoing email restrictions.
4. In case of AWS:
   • Fill form at https://aws-portal.amazon.com/gp/aws/html-forms-controller/contactus/ec2-email-limit-rdns-request for elastic IP mapping to mail.sbarjatiya.com

     Fill the form with barjatiya.saurabh@gmail.com address so that email communication is not dependent upon sbarjatiya.com VM

5. Add reminder to terminate old server after a few days.

Not migrated awstats

Note steps for installing awstats and moving awstats configuration from old machine to new machine are missing. Incomplete steps for setting up awstats are:

1. Install awstatus using:

   dnf -y install awstats http://mirror.centos.org/centos/8/PowerTools/x86_64/os/Packages/perl-Switch-2.17-10.el8.noarch.rpm

   /pre.

2. Copy /etc/awstats and /var/lib/awstats from old server to new
3. Open https://sbarjatiya.com/awstats/awstats.pl?config=www.sbarjatiya.com and check

Refer:

• Migrate sbarjatiya.com VM
• CentOS 8.x migrate CentOS 7.x postfix, dovecot, squirrelmail server
• Migrating mail server from one machine to another

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