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Phase out cergen for Observability services
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Description

cergen is our legacy tooling to manage/generate TLS certificates (https://wikitech.wikimedia.org/wiki/Cergen). It has been replaced by an installation of cfssl (https://wikitech.wikimedia.org/wiki/PKI) and the majority of services uses it.

Our cergen installation is co-hosted on one of the Puppet master (5) frontends (puppetmaster1001), which runs Buster. cergen is based on legacy libraries (it uses networkx v1, which is incompatible with current networkx releases (networkx 2 was released in 2017) and even when the puppetmasters were moved to Buster, this needed a hack to build a co-installable legacy package in a compomnent (T235405).

Instead of forward-porting it yet again to the new installation we'll use the Puppet 5 -> Puppet 7 migration to also phase out cergen and only use cfssl.

Most of those certs are used by Envoy and our Puppet integration makes switching relatively straightforward by switching the profile::tlsproxy::envoy::ssl_provider Hiera flag to "cfssl" (along with specifying SNI names via profile::tlsproxy::envoy::cfssl_options/hosts)

Some examples for this can be found at
https://github.com/wikimedia/operations-puppet/commit/66fbddeac3a4b2dfa1d8e19a49cc649dcb745f18
https://github.com/wikimedia/operations-puppet/commit/a00d0441b4509e736d8abd6ff63f25224e306239

For use cases outside of Envoy the profile::pki::get_cert define provides a convenient method to request certificates. An example how the gradual migration was implemented for the Ganeti RAPI endpoint can be found at https://github.com/wikimedia/operations-puppet/commit/98350d2dff51bb9bf57263fe50f409374892ae1d

There are currently 8 certificate YAML specs defined in /srv/private/modules/secret/secrets/certificates/certificate.manifests.d which need to be moved to PKI/cfssl. Some services are likely also ported already and only the YAML spec file and the legacy certs were forgotten and fixing it might be a simple as removing the legacy cert material.

  • grafana.certs.yaml
  • grafana_labs.certs.yaml (probably just leftover?)
  • graphite.certs.yaml
  • kibana.certs.yaml
  • performance.certs.yaml
  • prometheus.certs.yaml
  • thanos-query.certs.yaml (probably just leftover?)
  • webperf.certs.yaml
grafana.certs.yaml
nameDNScomment
grafana.discovery.wmnet
grafana.svc.eqiad.wmnet
grafana.svc.codfw.wmnet
grafana1001.eqiad.wmnet
grafana1002.eqiad.wmnet
grafana2001.codfw.wmnet
grafana.wikimedia.org
grafana-next.wikimedia.org
grafana-labs.wikimedia.org
grafana-labs-admin.wikimedia.org
grafana-rw.wikimedia.org
grafana-next-rw.wikimedia.org
grafana_labs.certs.yaml
nameDNScomment
grafana-labs.discovery.wmnet
graphite-labs.discovery.wmnet
grafana-labs.wikimedia.org
graphite-labs.wikimedia.org
cloudmetrics1001.eqiad.wmnet
cloudmetrics1002.eqiad.wmnet
cloudmetrics2001.codfw.wmnet
cloudmetrics2001.codfw.wmnet
graphite.certs.yaml
nameDNScomment
graphite.discovery.wmnet
graphite.svc.eqiad.wmnet
graphite.svc.codfw.wmnet
graphite1001.eqiad.wmnet
graphite1004.eqiad.wmnet
graphite2003.codfw.wmnet
graphite.wikimedia.org
cas-graphite.wikimedia.org
graphite-beta.wikimedia.org
graphite-labs.wikimedia.org
graphite-labs-admin.wikimedia.org
kibana.certs.yaml
nameDNScomment
cas-logstash.wikimedia.orgdon't need anymore
kibana-next.svc.codfw.wmnetdon't need anymore
kibana-next.svc.eqiad.wmnetdon't need anymore
kibana.discovery.wmnetdon't need anymore
kibana.svc.codfw.wmnetdon't need anymore
kibana.svc.eqiad.wmnetdon't need anymore
kibana7.svc.codfw.wmnetkeep
kibana7.svc.eqiad.wmnetkeep
logs-api.discovery.wmnetkeep, and add DNS as part of T356386
logs-api.svc.codfw.wmnetkeep
logs-api.svc.eqiad.wmnetkeep
logstash-next.wikimedia.orgkeep - we'll use this in the future
logstash.wikimedia.orgkeep
thanos-query.certs.yaml
nameDNScomment
thanos-query.discovery.wmnetkeep
thanos-query.svc.eqiad.wmnetkeep
thanos-query.svc.codfw.wmnetkeep
thanos.wikimedia.orgkeep
thanos-swift.discovery.wmnetkeep, though check because thanos-swift isn't o11y anymore and might use cfssl already
thanos-swift.svc.eqiad.wmnetkeep, ditto re: thanos-swift
thanos-swift.svc.codfw.wmnetkeep, ditto re: thanos-swift
prometheus.certs.yaml
nameDNScomment
prometheus-eqiad.wikimedia.orgkeep
prometheus-codfw.wikimedia.orgkeep
prometheus-esams.wikimedia.orgkeep
prometheus-ulsfo.wikimedia.orgkeep
prometheus-eqsin.wikimedia.orgkeep
prometheus-drmrs.wikimedia.orgkeep
prometheus.eqiad.wikimedia.orgdon't need anymore
prometheus.codfw.wikimedia.orgdon't need anymore
prometheus.esams.wikimedia.orgdon't need anymore
prometheus.ulsfo.wikimedia.orgdon't need anymore
prometheus.eqsin.wikimedia.orgdon't need anymore
prometheus.drmrs.wikimedia.orgdon't need anymore

Details

SubjectRepoBranchLines +/-
operations/puppetproduction+1 -17
operations/puppetproduction+10 -16
operations/puppetproduction+0 -59
labs/privatemaster+0 -6
operations/puppetproduction+10 -4
operations/puppetproduction+0 -25
labs/privatemaster+0 -3
operations/puppetproduction+0 -30
labs/privatemaster+0 -3
operations/puppetproduction+9 -8
operations/puppetproduction+1 -0
operations/puppetproduction+1 -0
operations/puppetproduction+1 -0
operations/puppetproduction+5 -0
operations/puppetproduction+1 -0
labs/privatemaster+0 -3
operations/puppetproduction+7 -11
operations/puppetproduction+7 -11
operations/puppetproduction+0 -29
labs/privatemaster+0 -3
operations/puppetproduction+5 -1
labs/privatemaster+0 -3
labs/privatemaster+0 -3
operations/puppetproduction+0 -28
operations/puppetproduction+0 -26
operations/puppetproduction+0 -28
operations/puppetproduction+4 -0
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I've documented the migration process on Wikitech: https://wikitech.wikimedia.org/wiki/Cergen#Migrating_to_CFSSL

Please take a look at it if you can.

I fixed the title to reflect that this is specifically for moving a service based on Envoy, otherwise LGTM, thanks!

Thank you! :)

Mentioned in SAL (#wikimedia-operations) [2024-04-10T13:49:08Z] <denisse> Delete unused Prometheus TLS certificates - T360414

Change #1018724 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[labs/private@master] ssl: Delete dummy TLS key for the Prometheus hosts

https://gerrit.wikimedia.org/r/1018724

Change #1018724 merged by Andrea Denisse:

[labs/private@master] ssl: Delete dummy TLS key for the Prometheus hosts

https://gerrit.wikimedia.org/r/1018724

Change #1018749 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] prometheus: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1018749

Change #1018802 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] prometheus: Ensure the Prometheus PoP role uses TLSProxy

https://gerrit.wikimedia.org/r/1018802

Change #1019887 had a related patch set uploaded (by Dzahn; author: Dzahn):

[operations/puppet@production] graphite: switch envoy ssl provider to cfssl

https://gerrit.wikimedia.org/r/1019887

Change #1019888 had a related patch set uploaded (by Dzahn; author: Dzahn):

[operations/puppet@production] ssl: delete graphite.discovery.wmnet certificate

https://gerrit.wikimedia.org/r/1019888

Change #1019889 had a related patch set uploaded (by Dzahn; author: Dzahn):

[labs/private@master] delete graphite.discovery.wmnet dummy key

https://gerrit.wikimedia.org/r/1019889

Change #1019887 merged by Dzahn:

[operations/puppet@production] graphite: switch envoy ssl provider to cfssl

https://gerrit.wikimedia.org/r/1019887

Change #1019889 merged by Dzahn:

[labs/private@master] delete graphite.discovery.wmnet dummy key

https://gerrit.wikimedia.org/r/1019889

Change #1019888 merged by Dzahn:

[operations/puppet@production] ssl: delete graphite.discovery.wmnet certificate

https://gerrit.wikimedia.org/r/1019888

https://graphite.wikimedia.org has been switched. The old certs and keys are in /root on graphite1005/graphite2004 in the unlikely event of an issue. All the old unused names (that weren't in DNS anymore) have been removed from the certs.

Also since https://gerrit.wikimedia.org/r/c/operations/puppet/+/1019885 you can now switch over the primary graphite server from one to another with just a Hiera edit.

Mentioned in SAL (#wikimedia-operations) [2024-04-24T20:37:20Z] <denisse> Downtiming the Prometheus PoP hosts as part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-04-24T20:37:53Z] <denisse@cumin2002> START - Cookbook sre.hosts.downtime for 0:30:00 on prometheus6002.drmrs.wmnet,prometheus5002.eqsin.wmnet,prometheus3003.esams.wmnet,prometheus4002.ulsfo.wmnet with reason: Downtiming the Prometheus PoP hosts as part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-04-24T20:38:15Z] <denisse@cumin2002> END (PASS) - Cookbook sre.hosts.downtime (exit_code=0) for 0:30:00 on prometheus6002.drmrs.wmnet,prometheus5002.eqsin.wmnet,prometheus3003.esams.wmnet,prometheus4002.ulsfo.wmnet with reason: Downtiming the Prometheus PoP hosts as part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-04-24T20:38:41Z] <denisse> Disabling Puppet on the Prometheus PoP hosts as part of the cergen to CFSSL migration - T360414

Change #1018749 merged by Andrea Denisse:

[operations/puppet@production] prometheus: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1018749

Change #1023917 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] prometheus: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1023917

Mentioned in SAL (#wikimedia-operations) [2024-04-26T15:22:51Z] <denisse> Downtiming the Prometheus PoP hosts as part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-04-26T15:24:36Z] <denisse@cumin2002> START - Cookbook sre.hosts.downtime for 0:30:00 on prometheus6002.drmrs.wmnet,prometheus5002.eqsin.wmnet,prometheus3003.esams.wmnet,prometheus4002.ulsfo.wmnet with reason: Downtiming the Prometheus PoP hosts part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-04-26T15:25:03Z] <denisse> Disabling Puppet on the Prometheus PoP hosts as part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-04-26T15:25:28Z] <denisse@cumin2002> END (PASS) - Cookbook sre.hosts.downtime (exit_code=0) for 0:30:00 on prometheus6002.drmrs.wmnet,prometheus5002.eqsin.wmnet,prometheus3003.esams.wmnet,prometheus4002.ulsfo.wmnet with reason: Downtiming the Prometheus PoP hosts part of the cergen to CFSSL migration - T360414

Change #1023917 merged by Andrea Denisse:

[operations/puppet@production] prometheus: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1023917

Mentioned in SAL (#wikimedia-operations) [2024-04-26T15:29:07Z] <denisse> testing patch #1023917 on prometheus6002 - T360414

Mentioned in SAL (#wikimedia-operations) [2024-04-26T15:46:20Z] <denisse> Enabling Puppet on the Prometheus PoP hosts as part of the cergen to CFSSL migration - T360414

Change #1024712 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[labs/private@master] ssl: Delete dummy TLS key for the Prometheus hosts

https://gerrit.wikimedia.org/r/1024712

Mentioned in SAL (#wikimedia-operations) [2024-04-26T16:30:09Z] <denisse> Delete the unused Prometheus PoP TLS certificates in the private repository as part of the cergen to CFSSL migration - T360414

Change #1024712 merged by Andrea Denisse:

[labs/private@master] ssl: Delete dummy TLS key for the Prometheus hosts

https://gerrit.wikimedia.org/r/1024712

Change #1018802 abandoned by Andrea Denisse:

[operations/puppet@production] prometheus: Ensure the Prometheus PoP role uses TLSProxy

Reason:

Redundant, as this is imported by profile::prometheus::web_idp.

https://gerrit.wikimedia.org/r/1018802

Change #1024806 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/dns@master] wmnet: Add discovery entries for grafana and grafana-next

https://gerrit.wikimedia.org/r/1024806

Change #1024808 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] trafficserver: Add discovery entries for grafana and grafana-next

https://gerrit.wikimedia.org/r/1024808

Change #1024824 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[labs/private@master] ssl: Remove unnecessary dummy key from thanos-query hosts

https://gerrit.wikimedia.org/r/1024824

It seems like thanos-swift is not using CFSSL.

Change #1024824 merged by Andrea Denisse:

[labs/private@master] ssl: Remove unnecessary dummy key from thanos-query hosts

https://gerrit.wikimedia.org/r/1024824

Mentioned in SAL (#wikimedia-operations) [2024-04-29T18:25:32Z] <denisse> Manually delete unused TLS certificates for thanos-query as part of the CFSSL migration - T360414

Change #1025820 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] grafana: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1025820

Change #1025820 merged by Andrea Denisse:

[operations/puppet@production] grafana: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1025820

Change #1025856 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] grafana: Add the .wikimedia.org domain is in CFSSL options

https://gerrit.wikimedia.org/r/1025856

Change #1025856 merged by Andrea Denisse:

[operations/puppet@production] grafana: Add the .wikimedia.org domain to the CFSSL options

https://gerrit.wikimedia.org/r/1025856

Change #1025860 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] grafana: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1025860

Change #1025864 had a related patch set uploaded (by Dzahn; author: Dzahn):

[operations/puppet@production] grafana: add grafana-next-rw.wikimedia.org to cfssl cert

https://gerrit.wikimedia.org/r/1025864

Change #1025864 merged by Andrea Denisse:

[operations/puppet@production] grafana: add grafana-next-rw.wikimedia.org to cfssl cert

https://gerrit.wikimedia.org/r/1025864

Change #1025866 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] grafana: add grafana-next-rw.discovery.wmnet to cfssl cert

https://gerrit.wikimedia.org/r/1025866

Change #1025866 abandoned by Andrea Denisse:

[operations/puppet@production] grafana: add grafana-next-rw.discovery.wmnet to cfssl cert

Reason:

https://gerrit.wikimedia.org/r/1025866

Change #1025877 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[labs/private@master] ssl: Delete dummy TLS key for the Grafana hosts

https://gerrit.wikimedia.org/r/1025877

Change #1025879 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] logstash: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1025879

Change #1025860 merged by Andrea Denisse:

[operations/puppet@production] grafana: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1025860

Change #1025877 merged by Andrea Denisse:

[labs/private@master] ssl: Delete dummy TLS key for the Grafana hosts

https://gerrit.wikimedia.org/r/1025877

Change #1026624 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] ssl: Delete unused certificate for the Grafana hosts

https://gerrit.wikimedia.org/r/1026624

Change #1026625 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] ssl: Delete unused certificate for the thanos-query hosts

https://gerrit.wikimedia.org/r/1026625

Change #1026624 merged by Andrea Denisse:

[operations/puppet@production] ssl: Delete unused certificate for the Grafana hosts

https://gerrit.wikimedia.org/r/1026624

Change #1026625 merged by Andrea Denisse:

[operations/puppet@production] ssl: Delete unused certificate for the thanos-query hosts

https://gerrit.wikimedia.org/r/1026625

Change #1026692 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] wmcs: Remove unnecesary kibana and kibana-discovery certificates

https://gerrit.wikimedia.org/r/1026692

Change #1026693 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[labs/private@master] ssl: Remove unnecessary dummy key for the kibana hosts

https://gerrit.wikimedia.org/r/1026693

Change #1028546 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] thanos: Update certificate names for Thanos hosts to match CFSSL

https://gerrit.wikimedia.org/r/1028546

Change #1028876 had a related patch set uploaded (by Andrea Denisse; author: Andrea Denisse):

[operations/puppet@production] thanos: Update TLS certificate in Envoy config to match CFSSL provisioning

https://gerrit.wikimedia.org/r/1028876

Mentioned in SAL (#wikimedia-operations) [2024-05-07T19:46:30Z] <denisse> disabling Puppet on the Logstash hosts that serve OpenSearch dashboards to test the CFSSL certificates - T360414

Change #1025879 merged by Andrea Denisse:

[operations/puppet@production] logstash: Ensure TLS certificates are provided by CFSSL

https://gerrit.wikimedia.org/r/1025879

Mentioned in SAL (#wikimedia-operations) [2024-05-07T19:57:35Z] <denisse@cumin2002> START - Cookbook sre.hosts.downtime for 0:30:00 on 12 hosts with reason: Downtiming the Logstash hosts serving OpenSearch Dashboards as part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-05-07T19:57:55Z] <denisse@cumin2002> END (PASS) - Cookbook sre.hosts.downtime (exit_code=0) for 0:30:00 on 12 hosts with reason: Downtiming the Logstash hosts serving OpenSearch Dashboards as part of the cergen to CFSSL migration - T360414

Mentioned in SAL (#wikimedia-operations) [2024-05-07T20:06:36Z] <denisse> Enabling Puppet on the Logstash hosts that serve OpenSearch dashboards to migrate to CFSSL certificates - T360414

Mentioned in SAL (#wikimedia-operations) [2024-05-07T20:09:57Z] <denisse> Restarting envoyproxy and opensearch-dashboards services on the Logstash hosts that serve OpenSearch dashboards to migrate to CFSSL certificates - T360414

Change #1026693 merged by Andrea Denisse:

[labs/private@master] ssl: Remove unnecessary dummy key for the kibana hosts

https://gerrit.wikimedia.org/r/1026693

Change #1026692 merged by Andrea Denisse:

[operations/puppet@production] wmcs: Remove unnecesary kibana and kibana-discovery certificates

https://gerrit.wikimedia.org/r/1026692

Mentioned in SAL (#wikimedia-operations) [2024-05-07T20:17:24Z] <denisse> Deleting the kibana and kibana-combined certificates from the private repository - T360414

We have a special situation with the thanos* hosts:

The thanos-fe hosts TLS certificates are not provisioned with CFSSL. They use the legacy thanos-query.discovery.wmnet TLS certificate provisioned by cergen.
This prevents us from deleting the thanos-query.discovery.wmnet certificates from the private repositories even if the thanos-be hosts don't use them.

I sent patch #1028546 to migrate the thanos-fe TLS certificates to CFSSL.

Additionally, the thanos-be hosts TLS certificates are migrated to CFSSL but they referenced the old thanos-query certificate. I sent patch #1028876 so they use the CFSSL provisioned certificate.

Both patches need to be merged before the legacy thanos-query.discovery.wmnet certificate can be deleted from the private repository.

Please take a look at the patches if you can and let me know what you think. Thanks!

CC: @Dzahn @fgiunchedi @Muehlenhoff @MatthewVernon @herron

Also cc T356412: Consolidate TLS cert puppetry for ms and thanos swift frontends and @elukey since the thanos-fe work here will help with that task too

Hello! We have already moved ms-fe1009 to CFSSL via https://gerrit.wikimedia.org/r/c/operations/puppet/+/1026927
The plan is to move the rest of eqiad nodes today/tomorrow and then complete codfw too (slow rollout to catch any issue with clients etc..). Lemme know if I can be of any help :)

Also cc T356412: Consolidate TLS cert puppetry for ms and thanos swift frontends and @elukey since the thanos-fe work here will help with that task too

Hello! We have already moved ms-fe1009 to CFSSL via https://gerrit.wikimedia.org/r/c/operations/puppet/+/1026927
The plan is to move the rest of eqiad nodes today/tomorrow and then complete codfw too (slow rollout to catch any issue with clients etc..). Lemme know if I can be of any help :)

Hi @elukey, this is related to the thanos-fe hosts. We can't continue with the CFSSL migration for thanos-be hosts as the thanos-fe hosts haven't been migrated to CFSSL. Please take a look at the comment I wrote above (and the related patch) if you can and let us know what you think. Thanks!

Change #1028546 abandoned by Andrea Denisse:

[operations/puppet@production] thanos: Provision Thanos frontend TLS certificates with CFSSL

Reason:

https://gerrit.wikimedia.org/r/1028546

Change #1028876 merged by Andrea Denisse:

[operations/puppet@production] thanos: Update TLS certificate in Envoy config to match CFSSL provisioning

https://gerrit.wikimedia.org/r/1028876

Mentioned in SAL (#wikimedia-operations) [2024-05-09T14:09:18Z] <denisse> Restarting envoyproxy on titan* hosts as part of the CFSSL migration - T360414

Nice work!

There are two leftovers, which fell through the cracks I think?

  • certificate.manifests.d/thanos-query.cert.yaml and thanos-query.discovery.wmnet in the private repo
  • modules/profile/files/ssl/thanos-query.discovery.wmnet.crt in puppet.git

@MoritzMuehlenhoff Thanks for taking a look! Unfortunately, we can't delete the thanos-query.discovery.wmnet because thanos-fe references it in its config.

I added a comment regarding this on T356412 so the Data Persistence team (owners of thanos-fe and thanos-swift) can either help us to remove those certificates once they finish the migration of those hosts or to let me know once they've finished the upgrades so I can delete them.

I'll be on the look for when those services are migrated to use CFSSL so those certs can be safely deleted, thank you. :)