The “How to form a cluster” documentation suggests that the “bootstrap server can be an existing Incus server” (How to form a cluster - Incus documentation), but does not go on any further to list any adjustments or steps that might need to be applied exclusively to an existing incus server (rather than a freshly initialized one).
The only note is on the section about joining new members into the cluster, which states that they must be freshly initialized incus servers (How to form a cluster - Incus documentation).
What I’m trying to do:
- I have an incus server to which I’ve already transferred some instances (from an old LXD cluster if that makes a difference)
- Now we have more hardware, I’d like to make that incus server part of a cluster with the new hardware.
- my understanding from the documentation was that I could use the existing incus server as the bootstrap without issue, then join in the fresh new servers
What happened:
When I ran “incus admin init” on the existing incus server and answered yes to clusting, then was asked “What IP address or DNS name should be used to reach this server?” I answered with the instance’s current IP address. I then got an error, stating: Invalid input: Can't bind address "192.168.2.2:8443": listen tcp 192.168.2.2:8443: bind: address already in use.
So I have questions:
- What needs to be done when trying to turn an existing (and in-use) incus server into a bootstrap server for a cluster?
- Is there any downtime or data loss as part of the conversion?
Just to provide a “version pinned” link to the documentation for people looking after it may have been updated: incus/doc/howto/cluster_form.md at 65f4b5aadac65e801da7e5c63a1a9439ffdfe3c5 · lxc/incus · GitHub
For reference, this is incus 6.0.0, taken from zabbly. Specifically 6.0-202404270857-ubuntu22.04