[SAC] [OSGeo] #3020: Creating backup of osgeo6 as lxc container on osgeo7

[OSGeo]

#3020: Creating backup of osgeo6 as lxc container on osgeo7
----------------------+--------------------------------------
 Reporter:  robe      |      Owner:  sac@…
     Type:  task      |     Status:  new
 Priority:  normal    |  Milestone:  Sysadmin Contract 2023-I
Component:  SysAdmin  |   Keywords:
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 Doing this so we can test upgrades and other stuff.
 It went thru okay (first time I'm successfully using lxd-migration (a 5.0
 version though, couldn't get the new one to compile as it complained about
 dqlite, of which I had no success installing)

 Steps are listed in
 https://git.osgeo.org/gitea/sac/osgeo7/wiki/osgeo6-backup----IN-PROGRESS,
 but I'll repeat here since nothing top secret about it

 On osgeo6

 {{{
 sudo -i
 screen  #create new screen so if get disconnected will still be running

 # worked this time 54.8GB copied
 screen
 ./lxd-migrate

 1) Url: https://osgeo7.osgeo.osuosl.org:8443
 2) choose 1 - certificate token
    a) create on osgeo7 using (lxd config trust add (specify osgeo6 for
 name), copy token

 3) a) Choose create container
   b) name: osgeo6-2023-11-05
 4) root path: /
 5) Extra mounts: yes
 6) mount: /var
 7) mount: /var/lib/mailman
 8) mount: /home
 9) enter #will end list
 9) 1) begin migration

 Ctrl a d #exit out of screen and detach to keep it running
 screen -r #pick the job # to reconnect

 # after migration is complete
 systemctl enable rsyslog
 systemctl start rsyslog
 }}}

 Note I didn't bother copying /var/www, so sites will not start, most of
 that stuff is deprecated, so I plan to rsync it over after the container
 starts up.

 # on osgeo7
 {{{
 lxc start osgeo6-2023-11-05
 }}}

 It took a really long time to start up, was on "Remapping filesystem for
 long time (like 20 minutes)

 At this point it has no ip, cause well old was hard-coded

 # on osge7
 {{{
 lxc snapshot osgeo6-2023-11-05 before-changes
 lxc exec osgeo6-2023-11-05 bash
 }}}

 # in osgeo6 backup container
 {{{
 #disable services
 systemctl disable mailman
 systemctl disable postfix #stop mail from sending
 systemctl disable fail2ban
 systemctl disable bacula-fd
 systemctl stop mailman
 systemctl enable rsyslog
 systemctl stop cron.d
 systemctl disable cron.d

 #systemctl mask systemd-journald
 systemctl start systemd-journald

 systemctl disable munin-node #removed on osgeo6 so not needed to disable
 any more
 systemctl disable lvm2
 systemctl stop lvm2


 systemctl start rsyslog


 nano /etc/hostname #change to osgeo6-backup
 mv /etc/fstab /etc/fstab.orig
 touch /etc/fstab #save blank

 mv /etc/network/interfaces /etc/network/interfaces.orig
 nano /etc/network/interfaces #change
 ```

 #contents after changing to static private
 auto lo
 iface lo inet loopback

 auto eth0
 iface eth0 inet dhcp

 --
 ```
 reboot
 }}}
-- 
Ticket URL: <https://trac.osgeo.org/osgeo/ticket/3020>
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