Ceph » Orchestrator

When installing on an IPv6-only cluster using cephadm, ceph-exporter fails to start.
In syslog, the following is shown:

...
File "/var/lib/ceph/<fsid>/cephadm.<hash>", line 2692, in get_daemon_args#012    ceph_exporter = CephExporter.init(ctx, fsid, daemon_id)#012  File "/var/lib/ceph/8367956c-c0de-41df-9e77-64020157ccbb/cephadm.7ab03136237675497d535fb1b85d1d0f95bbe5b95f32cd4e6f3ca71a9f97bf3c", line 972, in init#012    return cls(ctx, fsid, daemon_id,#012  File "/var/lib/ceph/8367956c-c0de-41df-9e77-64020157ccbb/cephadm.7ab03136237675497d535fb1b85d1d0f95bbe5b95f32cd4e6f3ca71a9f97bf3c", line 962, in __init__#012    self.addrs = config_json.get('addrs', socket.gethostbyname(socket.gethostname()))#012socket.gaierror: [Errno -5] No address associated with hostname

This is using Debian 11, Ceph Quincy, cephadm installed as debian package, version: 17.2.6-1~bpo11+1

In cephadm "socket.gethostbyname" is used to get the ip of the local system. However, this is an ipv4-only function: https://docs.python.org/3/library/socket.html#socket.gethostbyname
When changing this function to use "socket.getaddrinfo", the deployment succeeds.
I've patched the cephadm python script in /var/lib/<fsid>/cephadm.<hash> using the following patch:

--- cephadm.orig    2023-05-22 13:42:53.228515763 +0200
+++ cephadm    2023-05-25 09:57:20.278673702 +0200
@@ -959,7 +959,7 @@
         self.image = image

         self.sock_dir = config_json.get('sock-dir', '/var/run/ceph/')
-        self.addrs = config_json.get('addrs', socket.gethostbyname(socket.gethostname()))
+        self.addrs = config_json.get('addrs', socket.getaddrinfo(socket.gethostname(), None)[0][4][0])
         self.port = config_json.get('port', self.DEFAULT_PORT)
         self.prio_limit = config_json.get('prio-limit', 5)
         self.stats_period = config_json.get('stats-period', 5)

I'm far from a Python expert, but to my belief this will handle ipv6 and ipv4 correctly.