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Debian 9 (stretch) Upgrade Notes

The upgrade to Wazo 18.01 or later will take longer than usual, because the whole Debian system will be upgraded.

The database management system (postgresql) will also be upgraded from version 9.4 to version 9.6 at the same time. This will upgrade the database used by Wazo. This operation should take at most a few minutes.

After the upgrade, the system will need to be rebooted.

Before the upgrade

  • Make sure your have sufficient space for the upgrade. You might run into trouble if you have less than 2 GiB available in the file system that holds the /var{.interpreted-text role="file"} and /{.interpreted-text role="file"} directories.
  • If you have customized the Debian system of your XiVO in some nontrivial way, you might want to review the official Debian release notes before the upgrade. Most importantly, you should:

    • Make sure you don't have any unofficial sources in your /etc/apt/sources.list{.interpreted-text role="file"} or /etc/apt/sources.list.d{.interpreted-text role="file"} directory. If you were using the jessie-backports source, you must remove it.
    • Remove packages that were automatically installed and are not needed anymore, by running apt-get autoremove --purge.
    • Purge removed packages. You can see the list of packages in this state by running dpkg -l | awk '/^rc/ { print $2 }' and purge all of them with apt-get purge $(dpkg -l | awk '/^rc/ { print $2 }')
    • Remove .dpkg-old{.interpreted-text role="file"}, .dpkg-dist{.interpreted-text role="file"} and .dpkg-new{.interpreted-text role="file"} files from previous upgrade. You can see a list of these files by running find /etc -name '*.dpkg-old' -o -name '*.dpkg-dist' -o -name '*.dpkg-new'.

Upgrade

The upgrade must be done with three commands:

  • xivo-dist phoenix: Ensures your system is not restricted to a specific version
  • wazo-upgrade: Installs the wazo-dist-upgrade script and makes sure the system is up-to-date.
  • wazo-dist-upgrade: Upgrade to the latest version of Wazo with Debian 9 (stretch). This upgrade will take longer than usual.

You may need to reboot your machine before running wazo-dist-upgrade. wazo-dist-upgrade will tell you if a reboot is needed.

To minimize the downtime, you can pre-download the packages required for the upgrade with:

wazo-upgrade -d
wazo-dist-upgrade -d

After the upgrade

  • Check that customization to your configuration files is still effective.

    During the upgrade, new version of configuration files are going to be installed, and these might override your local customization. For example, the vim package provides a new /etc/vim/vimrc{.interpreted-text role="file"} file. If you have customized this file, after the upgrade you'll have both a /etc/vim/vimrc{.interpreted-text role="file"} and /etc/vim/vimrc.dpkg-old{.interpreted-text role="file"} file, the former containing the new version of the file shipped by the vim package while the later is your customized version. You should merge back your customization into the new file, then delete the .dpkg-old{.interpreted-text role="file"} file.

    You can see a list of affected files by running find /etc -name '*.dpkg-old'. If some files show up that you didn't modify by yourself, you can ignore them.

  • Purge removed packages. You can see the list of packages in this state by running dpkg -l | awk '/^rc/ { print $2 }' and purge all of them with apt-get purge $(dpkg -l | awk '/^rc/ { print $2 }')
  • Reboot your system. It is necessary for the new Linux kernel to be effective.

Changes

Here's a non-exhaustive list of changes that comes with Wazo on Debian 9:

  • Network interface names (only for new installs, not upgrades): Debian Stretch uses the new standard naming scheme for network interfaces instead of eth0, eth1, etc. The new enumeration method relies on more sources of information, to produce a more repeatable outcome. It uses the firmware/BIOS provided index numbers and then tries PCI card slot numbers, producing names like ens0 or enp1s1.