Upgrade Panel and OS

Hi guys
I have a little VPS with:
SO: Wheezy
I-mscp 1.2.2
Mod FCGI
Plugins: Panel redirect - Opendkim - SpamAssassin
Tools: PhpPgAdmin, Adminer
DDBB: PostgreSql 9.1
Active Domain: 13

What I want to do:
Upgrade OS to Jessie with Systemd
Upgrade PHP to 7.0
Upgrade panel to the latest version
Keept FCGI mode (or is convenient FPM ot ITK?)
Activate a second DNS
Install LetsEncript plugin for the panel and four domain

My questions

Should I upgrade the panel or OS first?
To activate the second DNS, should I do it while upgrade the panel or after that?
This how to configure the second DNS is right? (https://i-mscp.net/index.php/T…meserver-Howto/#post42006)

To upgrade the panel I must:

1.- Deactivate an delete all the active plugins
2.- Stop Mysql service
3.- stop imscp_panel
4.- stop ftp service

Should I do this?

• Code

  1. # service apache2 stop# pkill -KILL -f apache2# apt-get --assume-yes --auto-remove purge apache2*# rm -f /usr/lib/apache2/modules/mod_proxy_fcgi.so# dpkg-divert --rename --remove /usr/lib/apache2/modules/mod_proxy_fcgi.so# rm -rf /etc/apache2 /usr/lib/apache2 /var/lib/apache2

  and this?
  

• Code

  1. # umount -l /var/www/virtual
  2. # umount -l /var/www
  3. # mount -a

Is this right?, ... any other advice to jump to 1.2.2 to 1.4.3?

Thanks in advance

Victor

@CSF thanks, I will try this weekend

Saludos cordiales

Victor