FritzVirtualization

Initial scratch notes on getting kvm working on fritz. This will need to be integrated into SetupNewMachines and AdminArea after everything is working.

See http://wiki.hcoop.net/Migration2009/SoftwareSetup for the gist of what ClintonEbadi is trying to do here, but s/OpenVZ/KVM via libvirt/g.

1. Test Setup Notes

Nothing in particular order since it's all quite fuzzy

Account clinton_admin has been added to the libvirt group (permits ClintonEbadi to manage kvms as his user remotely using virt-manager
Investigated bridging and firewalling: https://bugzilla.redhat.com/show_bug.cgi?id=512206
- This also implies that using a separate bridge per VM is ideal
- As advised in the bug, we have disabled netfilter on the bridge
Installed and configured: less sudo vim emacs23-nox etckeeper changetrack openssh-server debsums logcheck bzip2 denyhosts rkhunter openafs-client ntp nscd krb5-user libpam-krb5 ssmtp libpam-afs-session openafs-krb5

1.1. Tasks

= done, = not done, = gave up or died trying

Set up network bridge
Create test KVM to discover preseed values and other config bits
Generate basic preseed file where login + kinit && aklog work
Create local Debian archive for libnss-afs
- gnupg keyring etc. for verified package builds
- Archive key for secure apt installs
- Repackage libnss-afs for the current Debian standards versions (version is 3.7 which is unsupported; debuild promotes it to 4, but levels before 5 are deprecated...)
Package nsswitch.conf changes and generate preseed for a machine that recognizes pts users (ssh $hcoop-user@machine should work at this point)
- Update DebianPackaging with information on creating config packages and using dput to push them to the archive
Preseed that installs libnss-afs and hcoop-nsswitch-config
Update domtool init scripts to work with insserv since non-dependency-based init is deprecated and will be removed in wheezy
Update FirewallRules closed.conf for the modern age and package
- Add hostname field fwtool firewall config (so that users / services can have different ports on different machines)
- Codify universal afs / kerberos / etc. ports that always have to be open in firewall config (can probably mostly yank this info from fritz)
Apply advanced wine making techniques to carefully blend the Apache configurations on fritz and mire and package the result
- Add new phpVersion 53 to DomTool and (hopefully this can be done) make phpVersion support checking if the host supports that version (easy check: if the node is mire, support 4/5, if the node is fritz only support 5.3)
Fix local user vs ptdb user for system services UID mismatch
Spin up the fancy new Apache KVM and pray that it works
- Move gitweb and git hosting over
- Set up rcube
- Set up squirrelmail (harder than rcube: we have to point mail. at the KVM, and then use MX records... punt on this for the time being)
- Turn off fritz's Apache (it's the KVM host and KDC ... change of plans, eh)
- Point hcoop.net at the new machine (also a huge reconfiguration PITA)
- Start assisting the first brave users with "moving" to new machine (i.e. webAt "newNode", or adding an env var to Easy_Domain` to change the default web node for everything)
  - After sure of everything working, inspect all user DomTool configs and make the needed changes for the users to switch their hosting to new node (in trivial cases e.g. mod_proxy to app on mire, static file serving)
Using lessons from above tasks, spin up new user shell machine
Harrass any users who refuse to leave mire
Turn mire off, remove from rack, set on fire

1.2. Packages Config

Things not mentioned on SetupNewMachines that had to have their default debconf values changed.

ssmtp
- forward all mail for UID < 1000 to logs
- Masquerade as hcoop.net
PAM
- Newfangled pam-config framework for a fresh squeeze install looks quite promising... (enabled kerberos + unix + afs session)

1.3. Major Open issues

Exim setup (have to add to forwardable domains on deleuze)
Automated partitioning (looks like I might have to manually craft the partman template instead of dumping it from d-i)
HostnameSuggestions (the results are eagerly awaited)
Figuring out what to do wrt local users for system services that need to access afs
- e.g. Apache, Exim, debarchiver, domtool, impad, spamd, ...
- AFAICT, it makes more sense to just have afs users -- if the ptdb is gone, the services will not operate in a correct way anyway
- Removes issues with keeping UIDs in sync
- How does this interact with Debian automatically creating system users for packages?
- A few system users were created using create-user -- mail is routed to them and they are subscribed to mailing lists and whatnot which is ... probably bad. i.e. We probably want to split create-user into the portions to just create an afs/kerberos user and then to do the fancy stuff an actual factual human user needs.

2. Debian Mirror

Using debarchiver on hopper (we want to run as little as possible on fritz)
/afs/hcoop.net/common/debian/...
- .../old/ = current contents (obsolete package sources / builds)
- .../src/
  - hcoop/ our custom packages (hcoop-$foo-config and libnss-afs)
  - backport/ manually backported packages (ideally, this contains nothing)
- .../archive/ = debarchiver
Export /afs/hcoop.net/debian/archive/ @ http://debian.hcoop.net/ (open to suggestions on this)
Using debuild on ClintonEbadi's personal workstation for now (only going to package the amd64 version of libnss-afs (for now) and arch independent config file debs)
- Ideally, we'd use pbuilder on an amd64 KVM; in the real world we'll probably end up with pbuilder on fritz (using debuild directly on fritz has the unfortunate consequence of installing lots of unecessary build deps)

2.1. Side Effects

Moved common.debian volume from deleuze to fritz (ack!)
- Incidentally moved common.app and common.etc to fritz which might improve bugzilla/whatnot performance (despite network overhead, it's probably faster to serve from fritz to deleuze)
Kept everything in one volume -- it's not too hard to split common.debian up later
Created and destroyed afs user debarchiver
- Issues with UID mismatches and nscd bit me again, created an afs only debian-archive user instead
Gave debian-archive.daemon write permissions to /afs/hcoop.net/common/debian/archive
Granted hcoop domtool perms to debian archive dir and set http://debian.hcoop.net/ to serve it (from fritz, but soon the www server...)

2.2. TODO

Create an afs group that can write to the incoming directory of the archive
Fix libnss-afs package for current Debian standards
See why libnss-afs can no longer build with openafs 1.6 (not an issue at the moment, but it will be sooner than we expect...)
Update DebianPackaging to contain info on archive, config packages, etc.
- Actually put config packages and libnss-afs into the correct locations

2.3. Config

As part of standardizing the config ... these should be put into hcoop-debarchiver-config and hcoop-dput-config

/etc/debarchiver.conf: see hopper, too long to include

/etc/cron.d/debarchiver: Unfortunately not quite working -- for some reasons this has to be done twice before Packages is updated (this happens with my local debarchiver so I ... have no idea)

#
# Regular cron jobs for the debarchiver package
#
# Run the archiver every five minutes.
*/5 * * * *     debian-archive  test -x /usr/bin/debarchiver && k5start -f /etc/keytabs/user.daemon/debian-archive -t -U -- debarchiver --autoscanall --addoverride | logger -t debarchiver -p daemon.info

~/.dput.cf:

[hcoop]
fqdn = local
method = local
incoming = /afs/hcoop.net/common/debian/archive/incoming/
allow_unsigned_uploads = 1

3. Debian Based Package Config

Based on

Anything we can't use debconf for in the preseed, we should push using Debian packages. We already need a mirror for libnss-afs so we may as well take advantage of it?

Packages needing customization on all machines:

ferm (closed.conf)
nsswitch.conf (not sure of package)
mdadm, rkhunter, tripwire, et al: This will need to be done as a general "CleaningUpOurAtrociouslyNoisyLoggingConfiguration" project (hint, hint).

Packages that need customization if installed:

whatever imapd we use on the new machines
exim
ejabberd
apache

Ideas:

virtual packages hcoop-user-node-config and hcoop-services-node-config that conflict and depend on the appropriate basic config settings (e.g. for setting up login.restrict, default ulimits, etc.)
If we want to use runit for services, we might include the service files and init.d overrides
What copyright policy should we take on conffiles (are they copyrightable? ... at least disclaim copyright? Does basing them on debian base files mean they have to take the license of the package?)

3.1. Setup Notes

Creating new archive section hcoop-config (MIT's athena uses debathena-config ... seems sane to me)
DEB_AUTO_UPDATE_DEBIAN_CONTROL=yes fakeroot debian/rules clean does something magic
Created initial hcoop-nsswitch-config, need to import into git and upload (see /afs/hcoop.net/user/c/cl/clinton_admin/hcoop-nsswitch-config-0/ for now)