Merge pull request #1157 from ceph/ceph-fsid

common: do not regenerate a cluster fsid if cluster exits

roles/ceph-common/tasks/facts.yml

@@ -5,6 +5,18 @@
   always_run: yes
   register: ceph_version
 
+- name: is ceph running already?
+  command: ceph --connect-timeout 3 --cluster {{ cluster }} fsid
+  changed_when: false
+  failed_when: false
+  always_run: yes
+  register: ceph_current_fsid
+  delegate_to: "{{ groups.mons[0] }}"
+
+- set_fact:
+    fsid: "{{ ceph_current_fsid.stdout }}"
+  when: ceph_current_fsid.rc == 0
+
 - set_fact:
     ceph_version: "{{ ceph_version.stdout.split(' ')[2] }}"
 

roles/ceph-common/tasks/main.yml

@@ -186,14 +186,22 @@
   run_once: true
   when: cephx or generate_fsid
 
-- name: generate cluster uuid
+- name: generate cluster fsid
   local_action: shell python -c 'import uuid; print(str(uuid.uuid4()))' | tee {{ fetch_directory }}/ceph_cluster_uuid.conf
     creates="{{ fetch_directory }}/ceph_cluster_uuid.conf"
   register: cluster_uuid
   become: false
-  when: generate_fsid
+  when:
+    - generate_fsid
+    - ceph_current_fsid.rc != 0
 
-- name: read cluster uuid if it already exists
+- name: reuse cluster fsid when cluster is already running
+  local_action: shell echo {{ fsid }} | tee {{ fetch_directory }}/ceph_cluster_uuid.conf
+    creates="{{ fetch_directory }}/ceph_cluster_uuid.conf"
+  become: false
+  when: ceph_current_fsid.rc == 0
+
+- name: read cluster fsid if it already exists
   local_action: command cat {{ fetch_directory }}/ceph_cluster_uuid.conf
     removes="{{ fetch_directory }}/ceph_cluster_uuid.conf"
   changed_when: false