Hi Lokendra, To make monitor looked up through dns, ceph-mon also need to be resolved correctly by dns server just like _ceph-mon._tcp. And ceph-mon is default service name, which doesn’t need to be in the conf file anyway. Ben
2023年2月3日 12:14，Lokendra Rathour <lokendrarathour@gmail.com> 写道：
Hi Robert and Team,
Thank you for the help. We had previously referred to the link: https://docs.ceph.com/en/quincy/rados/configuration/mon-lookup-dns/ But we were not able to configure mon_dns_srv_name correctly.
We find the following link: https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/4/html/co...
Which gives just a little more information about the DNS lookup.
After following the link, we updated the ceph.conf as follows: ``` [root@storagenode3 ~]# cat /etc/ceph/ceph.conf [global] ms bind ipv6 = true ms bind ipv4 = false mon initial members = storagenode1,storagenode2,storagenode3 osd pool default crush rule = -1 mon dns srv name = ceph-mon fsid = ce479912-a277-45b6-87b1-203d3e43d776 public network = abcd:abcd:abcd::/64 cluster network = eff0:eff0:eff0::/64
[osd] osd memory target = 4294967296
[client.rgw.storagenode3.rgw0] host = storagenode3 keyring = /var/lib/ceph/radosgw/ceph-rgw.storagenode3.rgw0/keyring log file = /var/log/ceph/ceph-rgw-storagenode3.rgw0.log rgw frontends = beast endpoint=[abcd:abcd:abcd::23]:8080 rgw thread pool size = 512
[root@storagenode3 ~]# ```
We also updated the dns server as follows:
``` storagenode1.storage.com IN AAAA abcd:abcd:abcd::21 storagenode2.storage.com IN AAAA abcd:abcd:abcd::22 storagenode3.storage.com IN AAAA abcd:abcd:abcd::23
_ceph-mon._tcp.storage.com 60 IN SRV 10 60 6789 storagenode1.storage.com _ceph-mon._tcp.storage.com 60 IN SRV 10 60 6789 storagenode2.storage.com _ceph-mon._tcp.storage.com 60 IN SRV 10 60 6789 storagenode3.storage.com _ceph-mon._tcp.storage.com 60 IN SRV 10 60 3300 storagenode1.storage.com _ceph-mon._tcp.storage.com 60 IN SRV 10 60 3300 storagenode2.storage.com _ceph-mon._tcp.storage.com 60 IN SRV 10 60 3300 storagenode3.storage.com
```
But when we run the command ceph -s, we get the following error:
``` [root@storagenode3 ~]# ceph -s unable to get monitor info from DNS SRV with service name: ceph-mon 2023-02-02T15:18:14.098+0530 7f1313a58700 -1 failed for service _ceph-mon._tcp 2023-02-02T15:18:14.098+0530 7f1313a58700 -1 monclient: get_monmap_and_config cannot identify monitors to contact [errno 2] RADOS object not found (error connecting to the cluster) [root@storagenode3 ~]# ```
Could you please help us to configure the server using mon_dns_srv_name correctly?
On Wed, Jan 25, 2023 at 9:06 PM John Mulligan <phlogistonjohn@asynchrono.us> wrote:
On Tuesday, January 24, 2023 9:02:41 AM EST Lokendra Rathour wrote:
Hi Team,
We have a ceph cluster with 3 storage nodes:
1. storagenode1 - abcd:abcd:abcd::21
2. storagenode2 - abcd:abcd:abcd::22
3. storagenode3 - abcd:abcd:abcd::23
The requirement is to mount ceph using the domain name of MON node:
Note: we resolved the domain name via DNS server.
For this we are using the command:
```
mount -t ceph [storagenode.storage.com]:6789:/ /backup -o name=admin,secret=AQCM+8hjqzuZEhAAcuQc+onNKReq7MV+ykFirg==
```
We are getting the following logs in /var/log/messages:
```
Jan 24 17:23:17 localhost kernel: libceph: resolve ' storagenode.storage.com' (ret=-3): failed
Jan 24 17:23:17 localhost kernel: libceph: parse_ips bad ip ' storagenode.storage.com:6789'
```
I saw a similar log message recently when I had forgotten to install the ceph mount helper. Check to see if you have a binary 'mount.ceph' on the system. If you don't try to install it from packages. On fedora I needed to install 'ceph-common'.
We also tried mounting ceph storage using IP of MON which is working
fine.
Query:
Could you please help us out with how we can mount ceph using FQDN.
My /etc/ceph/ceph.conf is as follows:
[global]
ms bind ipv6 = true
ms bind ipv4 = false
mon initial members = storagenode1,storagenode2,storagenode3
osd pool default crush rule = -1
fsid = 7969b8a3-1df7-4eae-8ccf-2e5794de87fe
mon host =
[v2:[abcd:abcd:abcd::21]:3300,v1:[abcd:abcd:abcd::21]:6789],[v2:[abcd:abcd:a
bcd::22]:3300,v1:[abcd:abcd:abcd::22]:6789],[v2:[abcd:abcd:abcd::23]:3300,v1
:[abcd:abcd:abcd::23]:6789]
public network = abcd:abcd:abcd::/64
cluster network = eff0:eff0:eff0::/64
[osd]
osd memory target = 4294967296
[client.rgw.storagenode1.rgw0]
host = storagenode1
keyring = /var/lib/ceph/radosgw/ceph-rgw.storagenode1.rgw0/keyring
log file = /var/log/ceph/ceph-rgw-storagenode1.rgw0.log
rgw frontends = beast endpoint=[abcd:abcd:abcd::21]:8080
rgw thread pool size = 512
-- ~ Lokendra skype: lokendrarathour _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io