Re: Discovery (port 8765) service not starting

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Now you've got me worried. As I said, there is absolutely no traffic
using port 8765 on my LAN.

Am I missing a service? Since my distro is based on stock Prometheus,
I'd have to assume that the port 8765 server would be part of the Ceph
generic container image and isn't being switched on for some reason.

   Tim

On Thu, 2024-09-05 at 15:05 +0100, Matthew Vernon wrote:
> On 05/09/2024 15:03, Matthew Vernon wrote:
> > Hi,
> > 
> > On 05/09/2024 12:49, Redouane Kachach wrote:
> > 
> > > The port 8765 is the "service discovery" (an internal server that
> > > runs in
> > > the mgr... you can change the port by changing the
> > > variable service_discovery_port of cephadm). Normally it is
> > > opened in the
> > > active mgr and the service is used by prometheus (server) to get
> > > the
> > > targets by using the http service discovery feature [1]. This
> > > feature has
> > > been there for a long time now and it's the default configuration
> > > used by
> > > Ceph monitoring stack. It should start automatically without any
> > > external
> > > intervention (or manual configuration). 
> > 
> > Right; it wasn't running because I have an IPv6 deployment (that
> > bug's 
> > fixed in 18.2.4 - https://tracker.ceph.com/issues/63448).
> 
> ...though I'm not sure that having only the active mgr run this
> endpoint 
> is correct, though? Isn't it more useful to be able to e.g. point my 
> Prometheus at any of the mgrs and have service discovery work, rather
> than needing Prometheus to know which mgr is active to know which sd
> to 
> talk to, which seems to rather defeat the point?
> 
> Thanks,
> 
> Matthew
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