Server busted.hcoop.net is a virtual machine at DigitalOcean that was created to work on the Debian Stretch to Buster upgrade.
It's name is just an allusion to it being broken by design.
1. Setup Notes
1.1. Prepare system for puppet
Newer kernel and some other base packages are available right out of the bat, need to upgrade so we can have working kernel headers for the afs build and whatnot. Added to general setup notes.
Puppet does not support NFT, even using iptables-nft which is default iptables implementation in Debian 10. Before the first reboot, switch the implementation to iptables-legacy.
We have to manually install gnupg; the rule we use to force an apt-get update when adding new sources makes it impossible for Apt::Key to install gnupg and verify keys, game over.
echo "domain hcoop.net" >> /etc/resolv.conf apt update && apt upgrade -y && apt install gnupg -y update-alternatives --set iptables /usr/sbin/iptables-legacy update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy wget https://apt.puppetlabs.com/puppet6-release-buster.deb && dpkg -i puppet6-release-buster.deb && apt update && apt install puppet-agent reboot # after reboot: /opt/puppetlabs/bin/puppet agent --test --onetime --noop --waitforcert 15
1.2. resolv.conf / initial puppet cert request
We can't really get around manually opening the firewall for the agent on the puppetmaster... at our scale this isn't a big deal anyway.
Like others, had to set domain hcoop.net manually in /etc/resolv.conf. It looks like the only reason we need this is for the initial puppet connection. So I tried setting the agent config at /etc/puppetlabs/puppet/puppet.conf to:
[main] server = puppet.hcoop.net
But the cert for the master only has the fqdn of its concrete hostname, and the alias puppet with no domain
Error: Server hostname 'puppet.hcoop.net' did not match server certificate; expected one of gibran.hcoop.net, DNS:puppet, DNS:gibran.hcoop.net Error: Could not run: Server hostname 'puppet.hcoop.net' did not match server certificate; expected one of gibran.hcoop.net, DNS:puppet, DNS:gibran.hcoop.net
If we could regenerate this to also include CN:puppet.hcoop.net, the manual edit that needed to be done would at least be more related to the limitation in our infrastructure that mandates it...
1.3. /usr/bin/mail behaves differently
GNU mailutils now provides /usr/bin/mail instead of bsd-mailx. It treats addresses a bit differently, appending the hostname. So mail -s "foo" root goes to email@example.com instead of just root which is then rewritten to firstname.lastname@example.org. The message then gets stuck in exim forever until it gets frozen and purged.
Not sure we want to switch back to bsd-mailx over this though, for now keep mailutils as the default provider.
2. Puppet porting notes
2.1. HCoop Debian Package Repo
After adding logic to hcoop::service::apt to force an `apt-get update' after any sources change before installing packages:
Apt::Source <| |> ~> Class['apt::update'] -> Package <| |>
A new problem arose: Error: Could not find a suitable provider for apt_key, because the apt::key type needs Package['gnupg'] to verify keys in order to add the repository, and it can't install it because it can't verify the keys of the custom repos...
Worked around by installing, not sure of general fix ... might be able to force installation of gnupg before Apt::Key in the hcoop::service::apt class ... but I think that might create a dependency cycle.
2.2. libnss-afs installs to non-multiarch location
minor issue, but might want to address. We're still installing to just /usr/lib instead of /usr/lib/x86_64-linux-gnu/ (need to update package to comply with multiarch)
3. Puppet WONTFIX
3.1. ssmtp is gone
We need to switch to msmtp
Switching to msmtp proved to be difficult, lowuid rewriting to send mails to logs@ alias is not working, and can't work as far as I can tell. I ended up just backporting ssmtp since it's not removed from Debian, but just didn't get moved into buster (it's also just a bit unmaintained). It might be easier to just set up exim in satellite mode going forward instead.