Lenny -> Squeeze

gistfile1.txt

Prep:

- apt-get update && apt-get upgrade && apt-get dist-upgrade
- Check for holds
    dpkg --audit 
    dpkg --get-selections | grep hold
    aptitude & press "g"
- Edit sources.list s/lenny/squeeze
- apt-get update NOTE: Debian docs say don't use aptitude to upgrade.
- apt-get upgrade to to a safe-upgrade
- Upgrade kernel: Requirements >=2.6.26 with CONFIG_SYSFS_DEPRECATED=n & CONFIG_INOTIFY_USER=y & CONFIG_SIGNALFD=y. Standard lenny kernel does not have that.
    - uname -r 
    - apt-get install linux-image-2.6.26FLAVOR
        NOTE: My install said I was already at the latest kernel, I can only assume that this means it was upgraded in the previous step OR the etch-lenny kernel patch fixed this issue. (kernel update was installed)
- Upgrade Grub and UDev
    - update-grub
    - apt-get install udev
    NOTE: On my first server it installed a new kernel anyway, but warned of missing firmware drivers despite non-free in sources.list. To fix this: apt-get install firmware-linux. On one server I needed to install firmware-realtek as well.
- reboot (and pray to whatever deities you worship) 
    - NOTE: Custom kernels seem to puke at this point. I was running 2.6.37 and this puked at this stage giving me a kernel panic on boot (Kernel panic- not syncing: VFS: Unable to mount root fs on unknown-block (0,0)). If you're migrating from an old system and/or using a custom kernel you must use SATA (with PATA extensions, even though they're experimental) as the Squeeze version of UDEV assumes this (and /dev/sdxx namings), you should also have CONFIG_IDE=n. 

I probably could sort it out, but I found just selecting the debian blessed kernel from the boot menu a hell of a lot easier.

- Download packages apt-get -d dist-upgrade
- Install apt-get dist-upgrade

- PROBLEMS: Unable to migrate to dependency-based boot system (http://wiki.debian.org/LSBInitScripts/DependencyBasedBoot)
    - There were a few scripts which could not be converted to dependency based booting
        - Apache: Solution, PURGE as this was a hangover from pre apache2 days
        - Webmin no LSB tags: Solution, remove since I never use it anyway
        - sbadm : This is a server beach admin script
            - Solution: This is basically SSH so, copy SSH header
        - at: not installed, but left some config there so Purge
        - mysql-server-5.0: Replaced buy 5.1 so purge
        - libdevmapper1.02 remove as it seems to be obsolete as of etch->lenny, took with it initrd-tools (which I believe has been superseded by initramfs-tools)
        - PURGE initrd-tools, libdevmapper1.02
        - Run dpkg-reconfigure sysv-rc

- Once this has been resolved, do a final dist-upgrade to pick up pieces.

- Reboot, and pray once again to the aforementioned gods 
- If boot ok, run upgrade-from-grub-legacy

CLEANUP:

- Reinstall mysql-server (apt-get install mysql-server) for some reason the upgrade didn't do this
- Fix Trac *again*
    - easy_install -U setuptools
    - easy_install http://github.com/hvr/trac-git-plugin/tarball/trac-0.11
    - easy_install TracAccountManager
    - easy_install -Z -U http://trac-hacks.org/svn/xmlrpcplugin/trunk
    - easy_install http://trac-hacks.org/svn/httpauthplugin/trunk/
    - Restart apache