On 3/25/25 16:12, Daniel Kral wrote:
Colocation Rules ----------------The two properties of colocation rules, as described in the introduction, are rather straightforward. A typical colocation rule inside of the config would look like the following: colocation: some-lonely-services services vm:101,vm:103,ct:909 affinity separate strict 1 This means that the three services vm:101, vm:103 and ct:909 must be kept separate on different nodes. I'm very keen on naming suggestions since I think there could be a better word than 'affinity' here. I played around with 'keep-services', since then it would always read something like 'keep-services separate', which is very declarative, but this might suggest that this is a binary option to too much users (I mean it is, but not with the values 0 and 1).
Just to document this, I've played around with using a score to decide whether the colocation rule is positive/negative, how strict and to allow specifying a value on how much it is desired to meet the colocation rule in case of an optional colocation rule, much like pacemaker's version.
But in the end, I ditched the idea, since it didn't integrate well and it was also not trivial to find a good scale for this weight value that would correspond similarly as the node priority in HA groups, for example, especially when we select for each service individually.
On 3/25/25 16:12, Daniel Kral wrote:
[0] https://clusterlabs.org/projects/pacemaker/doc/3.0/Pacemaker_Explained/html/constraints.html#colocation-properties [1] https://bugzilla.proxmox.com/show_bug.cgi?id=5260 [2] https://bugzilla.proxmox.com/show_bug.cgi?id=5332 [3] https://lore.proxmox.com/pve-devel/c8fa7b8c-fb37-5389-1302-2002780d4...@proxmox.com/
I forgot to update the footnotes here when sending this. The first footnote was to the initial inspiration of a score-based colocation rule, but as already said this was dropped.
So the references for the two quotes from our Bugzilla [0] and [1] map to the foot note [1] and [2] here respectively.
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