As was mentioned in this thread, all of the mon clients (OSDs included) learn about other mons through monmaps, which are distributed when mon membership and election changes. Thus, your OSDs should already know about the new mons.
mon_host indicates the list of mons that mon clients should try to contact at boot. Thus, it's important to have correct in the config but doesn't need to be updated after the process starts. At least that's how I understand it; the config docs aren't terribly clear on this behaviour. Josh On Sat., Mar. 27, 2021, 2:07 p.m. Tony Liu, <tonyliu0...@hotmail.com> wrote: > Just realized that all config files (/var/lib/ceph/<cluster > id>/<service>/config) > on all nodes are already updated properly. It must be handled as part of > adding > MONs. But "ceph config show" shows only single host. > > mon_host [v2: > 10.250.50.80:3300/0,v1:10.250.50.80:6789/0] file > > That means I still need to restart all services to apply the update, right? > Is this supposed to be part of adding MONs as well, or additional manual > step? > > > Thanks! > Tony > ________________________________________ > From: Tony Liu <tonyliu0...@hotmail.com> > Sent: March 27, 2021 12:53 PM > To: Stefan Kooman; ceph-users@ceph.io > Subject: [ceph-users] Re: Do I need to update ceph.conf and restart each > OSD after adding more MONs? > > # ceph config set osd.0 mon_host [v2: > 10.250.50.80:3300/0,v1:10.250.50.80:6789/0,v2:10.250.50.81:3300/0,v1:10.250.50.81:6789/0,v2:10.250.50.82:3300/0,v1:10.250.50.82:6789/0 > ] > Error EINVAL: mon_host is special and cannot be stored by the mon > > It seems that the only option is to update ceph.conf and restart service. > > > Tony > ________________________________________ > From: Tony Liu <tonyliu0...@hotmail.com> > Sent: March 27, 2021 12:20 PM > To: Stefan Kooman; ceph-users@ceph.io > Subject: [ceph-users] Re: Do I need to update ceph.conf and restart each > OSD after adding more MONs? > > I expanded MON from 1 to 3 by updating orch service "ceph orch apply". > "mon_host" in all services (MON, MGR, OSDs) is not updated. It's still > single > host from source "file". > What's the guidance here to update "mon_host" for all services? I am > talking > about Ceph services, not client side. > Should I update ceph.conf for all services and restart all of them? > Or I can update it on-the-fly by "ceph config set"? > In the latter case, where the updated configuration is stored? Is it going > to > be overridden by ceph.conf when restart service? > > > Thanks! > Tony > > ________________________________________ > From: Stefan Kooman <ste...@bit.nl> > Sent: March 26, 2021 12:22 PM > To: Tony Liu; ceph-users@ceph.io > Subject: Re: [ceph-users] Do I need to update ceph.conf and restart each > OSD after adding more MONs? > > On 3/26/21 6:06 PM, Tony Liu wrote: > > Hi, > > > > Do I need to update ceph.conf and restart each OSD after adding more > MONs? > > This should not be necessary, as the OSDs should learn about these > changes through monmaps. Updating the ceph.conf after the mons have been > updated is advised. > > > This is with 15.2.8 deployed by cephadm. > > > > When adding MON, "mon_host" should be updated accordingly. > > Given [1], is that update "the monitor cluster’s centralized > configuration > > database" or "runtime overrides set by an administrator"? > > No need to put that in the centralized config database. I *think* they > mean ceph.conf file on the clients and hosts. At least, that's what you > would normally do (if not using DNS). > > Gr. Stefan > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io > _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
