Upgrade to Jessie

Upgrade Debian Squeeze to Jessie

1. Make sure your existing CanIt installation is up-to-date:

   upgrade-canit-appliance

2. Now upgrade the OS to Jessie:

   upgrade-canit-appliance jessie

   Then you'll see messages scroll by, as the machine downloads, unpacks, and re-starts assorted services. (This all only delays mail during the re-start phase).
3. We have had troubles with some appliances failing to install the Grub bootloader after the Jessie upgrade, so be sure to generate it again for all hard drives:

   dpkg-reconfigure grub-pc

   Should Grub fail to be installed, the system will not be able to load after a reboot. The only way to recover is to configure Grub with a rescue disk.
4. Reboot the machine.
   To check if mail is flowing use the following:

   tail -f /var/log/mail-daily/current.log or wherever they are to see if working

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NOTE: The above commands are for a single machine. If you are upgrading a cluster, then you should modify the steps as follows, starting with the DataBase machine:

1. Stop CanIt on all cluster members before each command:

   /etc/init.d/canit-system stop-gracefully

2. After the command in step (4) above, run:

   /etc/init.d/canit-system start

3. Also, all commands should be run in parallel. That is, run (i) and then (1) on all machines, then (i) and (2) on all machines, and so on, finishing with (ii).

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