Merge pull request #5672 from ingvagabund/migrate-embedded-etcd

Automatic merge from submit-queue.

Migrate embedded etcd to external etcd

Trello card: https://trello.com/c/9fnBfkT5/528-migrate-embedded-etcd-hosts-to-external-process?menu=filter&filter=label:committed-3.7

Tested on:
- [x] embedded etcd -> external rpm etcd
- [x] embedded etcd -> external docker etcd

One needs to set the `openshift_image_tag` before running the migration to containerized docker etcd.

3 files changed, 37 insertions, 1 deletions

diff --git a/roles/etcd/tasks/auxiliary/clean_data.yml b/roles/etcd/tasks/auxiliary/clean_data.yml
index 95a0e7c0a..1ed2db5bc 100644
--- a/roles/etcd/tasks/auxiliary/clean_data.yml
+++ b/roles/etcd/tasks/auxiliary/clean_data.yml
@@ -1,5 +1,5 @@
 ---
 - name: Remove member data
   file:
-    path: /var/lib/etcd/member
+    path: "{{ etcd_data_dir }}/member"
     state: absent
diff --git a/roles/etcd/tasks/auxiliary/disable_etcd.yml b/roles/etcd/tasks/auxiliary/disable_etcd.yml
new file mode 100644
index 000000000..7c6d0409d
--- /dev/null
+++ b/roles/etcd/tasks/auxiliary/disable_etcd.yml
@@ -0,0 +1,5 @@
+---
+- name: Disable etcd members
+  service:
+    name: "{{ etcd_service }}"
+    state: stopped
diff --git a/roles/etcd/tasks/auxiliary/force_new_cluster.yml b/roles/etcd/tasks/auxiliary/force_new_cluster.yml
new file mode 100644
index 000000000..ae8a36130
--- /dev/null
+++ b/roles/etcd/tasks/auxiliary/force_new_cluster.yml
@@ -0,0 +1,31 @@
+---
+- name: Set ETCD_FORCE_NEW_CLUSTER=true on first etcd host
+  lineinfile:
+    line: "ETCD_FORCE_NEW_CLUSTER=true"
+    dest: /etc/etcd/etcd.conf
+    backup: true
+
+- name: Start etcd
+  systemd:
+    name: "{{ etcd_service }}"
+    state: started
+
+- name: Wait for cluster to become healthy after bringing up first member
+  command: >
+    etcdctl --cert-file {{ etcd_peer_cert_file }} --key-file {{ etcd_peer_key_file }} --ca-file {{ etcd_peer_ca_file }} --endpoint https://{{ etcd_peer }}:{{ etcd_client_port }} cluster-health
+  register: l_etcd_migrate_health
+  until: l_etcd_migrate_health.rc == 0
+  retries: 3
+  delay: 30
+
+- name: Unset ETCD_FORCE_NEW_CLUSTER=true on first etcd host
+  lineinfile:
+    line: "ETCD_FORCE_NEW_CLUSTER=true"
+    dest: /etc/etcd/etcd.conf
+    state: absent
+    backup: true
+
+- name: Restart first etcd host
+  systemd:
+    name: "{{ etcd_service }}"
+    state: restarted