Bug 1966813

Summary: "Replacing an unhealthy etcd member whose node is not ready" procedure results in new etcd pod in CrashLoopBackOff
Product: OpenShift Container Platform Reporter: Suresh Kolichala <skolicha>
Component: EtcdAssignee: Sam Batschelet <sbatsche>
Status: CLOSED ERRATA QA Contact: ge liu <geliu>
Severity: medium Docs Contact:
Priority: low    
Version: 4.8   
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Target Release: 4.8.0   
Hardware: Unspecified   
OS: Unspecified   
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Last Closed: 2021-07-27 23:11:00 UTC Type: ---
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Description Suresh Kolichala 2021-06-01 23:37:53 UTC 
This bug was initially created as a copy of Bug #1958913

I am copying this bug because: 



Description of problem:
After executing the procedure https://docs.openshift.com/container-platform/4.7/backup_and_restore/replacing-unhealthy-etcd-member.html#restore-replace-stopped-etcd-member_replacing-unhealthy-etcd-member for master node in NotReady state the newly created etcd-master pod is in CrashLoopBackOff state with error: "member "https://192.168.123.120:2380" is no longer a member of the cluster and should not start" for etcd container (where 192.168.123.120 is an IP of deleted etcd member) and new etcd member is not added

$ oc get bmh
NAME                   STATE                    CONSUMER                                  ONLINE   ERROR
openshift-master-0-0   externally provisioned   ocp-edge-cluster-0-tc57w-master-0-0       true     
openshift-master-0-1   externally provisioned   ocp-edge-cluster-0-tc57w-master-1         true     
openshift-master-0-2   externally provisioned   ocp-edge-cluster-0-tc57w-master-2         true     
openshift-worker-0-0   provisioned              ocp-edge-cluster-0-tc57w-worker-0-56bfg   true     
openshift-worker-0-1   provisioned              ocp-edge-cluster-0-tc57w-worker-0-v2vln   true

$ oc get machine
NAME                                      PHASE     TYPE   REGION   ZONE   AGE
ocp-edge-cluster-0-tc57w-master-0-0       Running                          9m51s
ocp-edge-cluster-0-tc57w-master-1         Running                          19h
ocp-edge-cluster-0-tc57w-master-2         Running                          19h
ocp-edge-cluster-0-tc57w-worker-0-56bfg   Running                          19h
ocp-edge-cluster-0-tc57w-worker-0-v2vln   Running                          19h

$ oc get machine
NAME                                      PHASE     TYPE   REGION   ZONE   AGE
ocp-edge-cluster-0-tc57w-master-0-0       Running                          9m51s
ocp-edge-cluster-0-tc57w-master-1         Running                          19h
ocp-edge-cluster-0-tc57w-master-2         Running                          19h
ocp-edge-cluster-0-tc57w-worker-0-56bfg   Running                          19h
ocp-edge-cluster-0-tc57w-worker-0-v2vln   Running                          19h

$ oc get pods -n openshift-etcd |grep etcd| egrep -v quorum
etcd-master-0-0                      2/3     CrashLoopBackOff   8          20m
etcd-master-0-1                      3/3     Running            0          21m
etcd-master-0-2                      3/3     Running            0          24m

etcd members list before procedure
+------------------+---------+------------+------------------------------+--------------------------------------------------------+------------+
|        ID        | STATUS  |    NAME    |          PEER ADDRS          |                      CLIENT ADDRS                      | IS LEARNER |
+------------------+---------+------------+------------------------------+--------------------------------------------------------+------------+
| 2d975c0a88dbf8e3 | started | master-0-0 | https://192.168.123.120:2380 | https://192.168.123.120:2379,unixs://192.168.123.120:0 |      false |
| 437eebe379eefcde | started | master-0-1 | https://192.168.123.137:2380 | https://192.168.123.137:2379,unixs://192.168.123.137:0 |      false |
| c5b1706d6685bd6a | started | master-0-2 | https://192.168.123.128:2380 | https://192.168.123.128:2379,unixs://192.168.123.128:0 |      false |
+------------------+---------+------------+------------------------------+--------------------------------------------------------+------------+

etcd member list after the procedure
+------------------+---------+------------+------------------------------+--------------------------------------------------------+------------+
|        ID        | STATUS  |    NAME    |          PEER ADDRS          |                      CLIENT ADDRS                      | IS LEARNER |
+------------------+---------+------------+------------------------------+--------------------------------------------------------+------------+
| 437eebe379eefcde | started | master-0-1 | https://192.168.123.137:2380 | https://192.168.123.137:2379,unixs://192.168.123.137:0 |      false |
| c5b1706d6685bd6a | started | master-0-2 | https://192.168.123.128:2380 | https://192.168.123.128:2379,unixs://192.168.123.128:0 |      false |
+------------------+---------+------------+------------------------------+--------------------------------------------------------+------------+

Version-Release number of selected component (if applicable):
4.8.0-0.nightly-2021-05-09-105430

How reproducible:
100 %

Steps to Reproduce:
1. Get one of master nodes to NotReady (we set bmh online to false to simulate cause it)
2. Proceed with the procedure

Actual results:
see in description

Expected results:
new etcd-master pod starts and Running, new etcd member created, the cluster is healthy

Additional info:
adding must-gather and new etcd-master pod description
Comment 1 Suresh Kolichala 2021-06-02 01:32:56 UTC 
Adding the modified flowchart to reflect the modified logic in discover-init-cluster.
Comment 3 ge liu 2021-06-07 08:15:55 UTC 
Verified with comment 1
Comment 7 errata-xmlrpc 2021-07-27 23:11:00 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: OpenShift Container Platform 4.8.2 bug fix and security update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:2438