From: Sage Weil <sage@redhat.com>
Date: Mon, 9 Mar 2020 18:21:20 +0000 (-0500)
Subject: mgr/cephadm: safety check to prevent removing all mon|mgr daemons
X-Git-Tag: v15.1.1~37^2~7
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=9b96921857b886a5ce87fd5dc7a9c8576294cf52;p=ceph.git

mgr/cephadm: safety check to prevent removing all mon|mgr daemons

Signed-off-by: Sage Weil <sage@redhat.com>
---

diff --git a/src/pybind/mgr/cephadm/module.py b/src/pybind/mgr/cephadm/module.py
index 7b464d262604..74dd2f32d63b 100644
--- a/src/pybind/mgr/cephadm/module.py
+++ b/src/pybind/mgr/cephadm/module.py
@@ -2204,6 +2204,11 @@ class CephadmOrchestrator(orchestrator.Orchestrator, MgrModule):
 
         r = False
 
+        # sanity check
+        if daemon_type in ['mon', 'mgr'] and len(hosts) < 1:
+            self.log.debug('cannot scale mon|mgr below 1 (hosts=%s)' % hosts)
+            return False
+
         # add any?
         did_config = False
         hosts_with_daemons = {d.hostname for d in daemons}