From: Volker Theile <vtheile@suse.com>
Date: Tue, 10 May 2022 13:25:54 +0000 (+0200)
Subject: cephadm: prometheus: The generatorURL in alerts is only using hostname
X-Git-Tag: v16.2.11~577^2
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F46352%2Fhead;p=ceph.git

cephadm: prometheus: The generatorURL in alerts is only using hostname

Prometheus is currently using only the hostname in the 'generatorURL' of an alert which causes issues when clicking on the URL in the Ceph Dashboard or somewhere else, because in most cases the hostname of the node that is running the Prometheus container is not resolvable.

To fix that the command line argument '--web.external-url' must be appended in the systemd unit file of the Prometheus container, e.g. '--web.external-url http://foo.bar:9095' whereas a FQDN hostname is used.

Fixes: https://tracker.ceph.com/issues/55595

Signed-off-by: Volker Theile <vtheile@suse.com>
(cherry picked from commit 4281dc1bbc466dd061781a984b34bb0eafaf482f)
---

diff --git a/src/cephadm/cephadm b/src/cephadm/cephadm
index 93d3328d53fe..f53813eb5bab 100755
--- a/src/cephadm/cephadm
+++ b/src/cephadm/cephadm
@@ -2358,6 +2358,10 @@ def get_daemon_args(ctx, fsid, daemon_type, daemon_id):
                 if 'ports' in meta and meta['ports']:
                     port = meta['ports'][0]
             r += [f'--web.listen-address={ip}:{port}']
+            if daemon_type == 'prometheus':
+                scheme = 'http'
+                host = get_fqdn()
+                r += [f'--web.external-url={scheme}://{host}:{port}']
         if daemon_type == 'alertmanager':
             config = get_parm(ctx.config_json)
             peers = config.get('peers', list())  # type: ignore
diff --git a/src/cephadm/tests/test_cephadm.py b/src/cephadm/tests/test_cephadm.py
index f7d6aeede11c..e4d80f44036e 100644
--- a/src/cephadm/tests/test_cephadm.py
+++ b/src/cephadm/tests/test_cephadm.py
@@ -1091,6 +1091,14 @@ class TestMonitoring(object):
         version = cd.Monitoring.get_version(ctx, 'container_id', daemon_type)
         assert version == '0.16.1'
 
+    def test_prometheus_external_url(self):
+        ctx = cd.CephadmContext()
+        daemon_type = 'prometheus'
+        daemon_id = 'home'
+        fsid = 'aaf5a720-13fe-4a3b-82b9-2d99b7fd9704'
+        args = cd.get_daemon_args(ctx, fsid, daemon_type, daemon_id)
+        assert any([x.startswith('--web.external-url=http://') for x in args])
+
     @mock.patch('cephadm.call')
     def test_get_version_node_exporter(self, _call):
         ctx = cd.CephadmContext()