Remove etcd member by peerURLs (#12682)

* Remove etcd member by peerURLs

The way to obtain the IP of a particular member is convoluted and depend
on multiple variables. The match is also textual and it's not clear
against what we're matching

It's also broken for etcd member which are not also Kubernetes nodes,
because the "Lookup node IP in kubernetes" task will fail and abort the
play.

Instead, match against 'peerURLs', which does not need new variable, and
use json output.

* Add testcase for etcd removal on external etcd

* do not merge

* fixup! Remove etcd member by peerURLs

* fixup! Remove etcd member by peerURLs

roles/remove-node/remove-etcd-node/tasks/main.yml

@@ -1,14 +1,4 @@
 ---
-- name: Lookup node IP in kubernetes
-  command: >
-    {{ kubectl }} get nodes {{ node }}
-    -o jsonpath-as-json='{.status.addresses[?(@.type=="InternalIP")].address}'
-  register: k8s_node_ips
-  changed_when: false
-  when:
-  - groups['kube_control_plane'] | length > 0
-  delegate_to: "{{ groups['kube_control_plane'] | first }}"
-
 - name: Remove etcd member from cluster
   environment:
     ETCDCTL_API: "3"
@@ -19,25 +9,18 @@
   delegate_to: "{{ groups['etcd'] | first }}"
   block:
   - name: Lookup members infos
-    command: "{{ bin_dir }}/etcdctl member list"
+    command: "{{ bin_dir }}/etcdctl member list -w json"
     register: etcd_members
     changed_when: false
     check_mode: false
     tags:
     - facts
   - name: Remove member from cluster
-    vars:
-      node_ip: >-
-        {%- if not ipv4_stack -%}
-        {{ ip6 if ip6 is defined else (access_ip6 if access_ip6 is defined else (k8s_node_ips.stdout | from_json)[0]) | ansible.utils.ipwrap }}
-        {%- else -%}
-        {{ ip if ip is defined else (access_ip if access_ip is defined else (k8s_node_ips.stdout | from_json)[0]) | ansible.utils.ipwrap }}
-        {%- endif -%}
     command:
       argv:
       - "{{ bin_dir }}/etcdctl"
       - member
       - remove
-      - "{{ ((etcd_members.stdout_lines | select('contains', '//' + node_ip + ':'))[0] | split(','))[0] }}"
+      - "{{ '%x' | format(((etcd_members.stdout | from_json).members | selectattr('peerURLs.0', '==', etcd_peer_url))[0].ID) }}"
     register: etcd_removal_output
     changed_when: "'Removed member' in etcd_removal_output.stdout"