Puppet infrastructure

handel.debian.org is our current puppetmaster. Currently, it handles configuration of samhain, munin, apt, and exim (although more to come - this list is likely to get out of date quickly).

To set up a new host to be a puppet client:

Make sure you have set up the IP address for the new machine in ud-ldap. After that run puppet on puppetmaster once, so the ferm config gets adjusted.

    : __handel__ && puppet agent --no-daemonize --onetime --environment=production

    : ::client:: && me=$(hostname -f) && [ "$me" != "${me%debian.org}" ] && apt-get update &&
            apt-get install -y --no-install-recommends puppet ruby-augeas augeas-lenses lsb-release &&
            service puppet stop &&
            (puppet agent -t || true ) &&
            cd /var/lib/puppet/ssl/certificate_requests &&
            echo sha256sum output: && echo &&
            sha256sum $me.pem &&
            echo && echo && cd /

This will not overwrite anything yet, since handel has not signed the client cert. Now is the time to abort if you are getting cold feet.

To renew the certificate for an existing host:

: ::client:: &&
            puppet agent --disable &&
            mv /var/lib/puppet/ssl{,.bak}

: __handel__ &&
            puppet cert clean $HOST

: ::client:: &&
            me=$(hostname -f) && [ "$me" != "${me%debian.org}" ] &&
            (puppet agent -t || true) &&
            cd /var/lib/puppet/ssl/certificate_requests &&
            echo sha256sum output: && echo &&
            sha256sum $me.pem &&
            echo && echo && cd /

In both cases:

Compare incoming csr request: on handel, paste the sha256output::

    : __handel__ &&
            ud-replicate && sudo -u puppet make -C /srv/puppet.debian.org/ca/ install &&
            echo "paste sha256sum output now:" &&
            read sha256 filename &&
            cd /var/lib/puppet/ssl/ca/requests &&
            ( [ -e $filename ] || (echo "$filename does not exist."; exit 1) ) &&
            echo -e "$sha256  $filename" | sha256sum -c &&
            puppet ca sign $(basename "$filename" .pem) &&
            echo && echo && echo &&
            echo 'cat > /var/lib/puppet/ssl/certs/ca.pem << EOF ' &&
            cat /var/lib/puppet/ssl/certs/ca.pem &&
            echo 'EOF' &&
            echo "cat > /var/lib/puppet/ssl/certs/$filename << EOF " &&
            cat /var/lib/puppet/ssl/ca/signed/$filename &&
            echo 'EOF' &&
            cd / &&
            echo 'puppet agent --enable' &&
            echo 'puppet agent -t --pluginsync' &&
            echo 'puppet agent -t --pluginsync'

and execute this on the client.

    : ::client:: copy paste the thing you just created on handel

If this is a busy mail host, you might want to stop exim before proceeding although the config files should remain identical before and after.

Try this once if you're nervous:

    : ::client:: && puppet agent -t --pluginsync --noop

It will tell you what would have changed without actually doing it.

Then run (this will change the configs in /etc):

    : ::client:: && puppet agent -t --pluginsync

This run will start puppet after reconfiguring it, so if you are unhappy with what just happened, you'll need to stop it again to do repair.

Double check apt - the puppet setup usually results in duplicate apt sources, since we ship a few under sources.list.d. Remove any unnecessary entries from sources.list.

On handel, make sure the certs exist for the new host

We ship a samhain config file that includes /lib and /usr/lib. This will almost certainly be different than the config file on the machine, so it will result in 1000s of files changed. You may need to run samhain update after getting puppet going.

The puppet repository is public, but we sometimes need to keep passwords in puppet. There are many ways to do this - hiera-gpg, ENC, etc. We've settled on a fairly simple one. Log into handel, create a new manifest in the relevant module (call it something like "params.pp"). You can add passwords to this file. To stop git complaining on push, make sure you update .gitignore for the new file. Now you can import this file where you need passwords and use them.