Bug 1755558 - Performing disaster recovery twice on a cluster can fail to proceed the second time
Summary: Performing disaster recovery twice on a cluster can fail to proceed the secon...
Alias: None
Product: OpenShift Container Platform
Classification: Red Hat
Component: Etcd
Version: 4.1.z
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
: 4.1.z
Assignee: Clayton Coleman
QA Contact: ge liu
Depends On: 1755557
TreeView+ depends on / blocked
Reported: 2019-09-25 16:52 UTC by Clayton Coleman
Modified: 2019-12-02 09:24 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1755557
Last Closed: 2019-12-02 09:24:07 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Github openshift machine-config-operator pull 1135 0 'None' 'closed' 'Bug 1755558: Ensure ETCD_INITIAL_CLUSTER is preserved during restore' 2019-11-25 08:38:04 UTC
Red Hat Product Errata RHBA-2019:3913 0 None None None 2019-12-02 09:24:09 UTC

Description Clayton Coleman 2019-09-25 16:52:42 UTC
+++ This bug was initially created as a clone of Bug #1755557 +++


1. Perform DR steps (remove two masters, wait until quorum lost, physically delete machines)
2. Recover following instructions
3. Repeat 1 but pick a new master (one that was created in step 2)


Able to start a new etcd quorum on the first master with only itself


/usr/local/bin/etcd-snapshot-restore.sh /root/assets/backup/snapshot.db etcd-member-ip-10-0-149-142.ec2.internal=https://etcd-2.ci-ln-shp2psk-d5d6b.origin-ci-int-aws.dev.rhcloud.com:2380

restored the cluster containing the previous (etcd-0, etcd-1) members, preventing further progress.

The root cause is that the etcd-snapshot-restore script accepts ETCD_INITIAL_CLUSTER as an argument, but then sources /run/etcd/environment which may contain the value ETCD_INITIAL_CLUSTER.  So the user's intent was to start a new cluster with one member, but we started with 3 members (including the two that are permanently gone).

The script needs to preserve ETCD_INITIAL_CLUSTER correctly even if it's set in /run/etcd/environment.

Needs to be back ported to all releases.

Comment 2 ge liu 2019-11-21 10:33:49 UTC
I checked latest payload(4.1.0-0.nightly-2019-11-20-192514), code have not be merged into it.

Comment 4 ge liu 2019-11-25 08:38:46 UTC
Verfied with 4.1.25

Comment 6 errata-xmlrpc 2019-12-02 09:24:07 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, and where to find the updated
files, follow the link below.

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


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