In case your Checkmk Server is using https, and you're using the agent bakery, your SSL Certificate will be expired at some time. If the CA for the new certificate stays the same, this should be no problem for the agent bakery.
However, if the CA changes you would have to follow some extra steps.
Step-by-step guide
...
- get new certificate
- check if the certificate chain changed. If:
- yes: jump to step 3
- no: jump to step 4
- the chain changed
- add the new chain to the Agent Updater (do NOT replace the old chain!)
- bake and sign agents
- wait untill all agents updated
- jump so step 4
- the chain did not change or step 3 is done
- restrict Auto Updates to only 2 or 3 hosts, so if something goes wrong you do not mess up everything
- deploy the new certificate to the Apache server
- check for the correct cert and chain by using a browser
- make sure Auto Update works for the test hosts
- if the chain chagned (see step 3) remove the old chain from the updater rule, bake & sign agents, and see if everything works with the test hosts
- remove the restriction to the test hosts and update all agents.
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