On 12/10/2015 04:00 AM, deeepdish wrote:
> Hello,
>
> I encountered a strange issue when rebuilding monitors reusing same
> hostnames, however different IPs.
>
> Steps to reproduce:
>
> - Build monitor using ceph-deploy create mon <hostname1>
> - Remove monitor
> via http://docs.ceph.com/docs/master/rados/operations/add-or-rm-mons/
> <http://docs.ceph.com/docs/master/rados/operations/add-or-rm-mons/>
> (remove monitor) ? I didn?t realize there was a ceph-deploy mon destroy
> command at this point.
> - Build a new monitor on same hardware using ceph-deploy create mon
> <hostname1a> # reason = to rename / change IP of monitor as per above link
> - Monitor ends up in probing mode. When connecting via the admin
> socket, I see that there are no peers avail.
>
> The above behavior of only when reinstalling monitors. I even tried
> reinstalling the OS, however there?s a monmap embedded somewhere causing
> the previous monitor hostnames / IPs to conflict with the new monitor?s
> peering ability.
> [root@b02s08 ~]#
>
> On a reinstalled (not working) monitor:
>
> sudo ceph --cluster=ceph --admin-daemon
> /var/run/ceph/ceph-mon.smg01.asok mon_status
> {
> "name": "smg01",
> "rank": 0,
> "state": "probing",
> "election_epoch": 0,
> "quorum": [],
> "outside_quorum": [
> "smg01"
> ],
> "extra_probe_peers": [
> "10.20.1.8:6789\/0",
> "10.20.10.14:6789\/0",
> "10.20.10.16:6789\/0",
> "10.20.10.18:6789\/0",
> "10.20.10.251:6789\/0",
> "10.20.10.252:6789\/0"
> ],
[snip]
> }
>
> This appears to be consistent with a wrongly populated 'mon_host' and
> 'mon_initial_members' in your ceph.conf.
>
> -Joao
Thanks Joao. I had a look but my other 3 monitors are working just fine. To
be clear, I’ve confirmed the same behaviour on other monitor nodes that have
been removed from the cluster and rebuild with a new IP (however same name).
[global]
fsid = (hidden)
mon_initial_members = smg01, smon01s, smon02s, b02s08
mon_host = 10.20.10.250, 10.20.10.251, 10.20.10.252, 10.20.1.8
public network = 10.20.10.0/24, 10.20.1.0/24
cluster network = 10.20.41.0/24
. . .
[mon.smg01s]
#host = smg01s.erbus.kupsta.net
host = smg01s
addr = 10.20.10.250:6789
[mon.smon01s]
#host = smon01s.erbus.kupsta.net
host = smon01s
addr = 10.20.10.251:6789
[mon.smon02s]
#host = smon02s.erbus.kupsta.net
host = smon02s
addr = 10.20.10.252:6789
[mon.b02s08]
#host = b02s08.erbus.kupsta.net
host = b02s08
addr = 10.20.1.8:6789
# sudo ceph --cluster=ceph --admin-daemon /var/run/ceph/ceph-mon.smg01.asok
mon_status
{
"name": "smg01",
"rank": 0,
"state": "probing",
"election_epoch": 0,
"quorum": [],
"outside_quorum": [
"smg01"
],
"extra_probe_peers": [
"10.20.1.8:6789\/0",
"10.20.10.251:6789\/0",
"10.20.10.252:6789\/0"
],
"sync_provider": [],
"monmap": {
"epoch": 0,
"fsid": “(hidden)",
"modified": "0.000000",
"created": "0.000000",
"mons": [
{
"rank": 0,
"name": "smg01",
"addr": "10.20.10.250:6789\/0"
},
{
"rank": 1,
"name": "smon01s",
"addr": "0.0.0.0:0\/1"
},
{
"rank": 2,
"name": "smon02s",
"addr": "0.0.0.0:0\/2"
},
{
"rank": 3,
"name": "b02s08",
"addr": "0.0.0.0:0\/3"
}
]
}
}
Processes running on the monitor node that’s in probing state:
# ps -ef | grep ceph
root 1140 1 0 Dec11 ? 00:05:07 python
/usr/sbin/ceph-create-keys --cluster ceph -i smg01
root 6406 1 0 Dec11 ? 00:05:10 python
/usr/sbin/ceph-create-keys --cluster ceph -i smg01
root 7712 1 0 Dec11 ? 00:05:09 python
/usr/sbin/ceph-create-keys --cluster ceph -i smg01
root 9105 1 0 Dec11 ? 00:05:11 python
/usr/sbin/ceph-create-keys --cluster ceph -i smg01
root 13098 30548 0 07:18 pts/1 00:00:00 grep --color=auto ceph
root 14243 1 0 Dec11 ? 00:05:09 python
/usr/sbin/ceph-create-keys --cluster ceph -i smg01
root 31222 1 0 05:39 ? 00:00:00 /bin/bash -c ulimit -n 32768;
/usr/bin/ceph-mon -i smg01 --pid-file /var/run/ceph/mon.smg01.pid -c
/etc/ceph/ceph.conf --cluster ceph -f
root 31226 31222 1 05:39 ? 00:01:39 /usr/bin/ceph-mon -i smg01
--pid-file /var/run/ceph/mon.smg01.pid -c /etc/ceph/ceph.conf --cluster ceph -f
root 31228 1 0 05:39 pts/1 00:00:15 python
/usr/sbin/ceph-create-keys --cluster ceph -i smg01
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