Bug 1492891
| Summary: | etcd writes being blocked when hard quota hit | ||
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| Product: | OpenShift Container Platform | Reporter: | Max Whittingham <mwhittin> |
| Component: | Installer | Assignee: | Jan Chaloupka <jchaloup> |
| Status: | CLOSED ERRATA | QA Contact: | Gaoyun Pei <gpei> |
| Severity: | medium | Docs Contact: | |
| Priority: | high | ||
| Version: | 3.6.1 | CC: | aos-bugs, ccoleman, jeder, jiajliu, jokerman, mmccomas, sten |
| Target Milestone: | --- | Keywords: | OpsBlocker |
| Target Release: | 3.7.0 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
The etcd quota backend was set to 2GB by default. Which resulted in a cluster going into a hold state, blocking all writes into the etcd storage. The default quota backend was increased to 4GB by default to encompass the storage needs of bigger clusters.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2017-11-28 22:11:25 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
Max Whittingham
2017-09-18 21:55:30 UTC
The default quota is 2GB which we hit on us-east-1 and were very close to us-west-2 and us-west-1. We increased the limit to 4Gb. We should increase the limit out of the box to 8GB for all starter clusters (which is the etcd3 maximum) and add alerting to warn us when we cross the 4GB threshold. For end users, we should probably increase the default to 4Gb or 8Gb and also recommend alerting on the size value. The size of the /var/lib/etcd/member/db file should be very close to the internal size, and it's likely we can report on that as a proxy if it is simpler. Hard quota blocks all writes when hit, which means the cluster goes into a hold state until the quota is increased. It looks like we're not doing anything to compact old revisions as outlined in the etcd maintenance documentation. Shouldn't we be enabling that so that we don't grow unbounded? Relevant config vars from that cluster ETCD_QUOTA_BACKEND_BYTES=4294967000 ETCD_DATA_DIR=/var/lib/etcd/ ETCD_SNAPSHOT_COUNT=60000 ETCD_HEARTBEAT_INTERVAL=2000 ETCD_ELECTION_TIMEOUT=20000 ETCD_DEBUG=false ETCD_LOG_PACKAGE_LEVELS="*=INFO" https://coreos.com/etcd/docs/latest/op-guide/maintenance.html Commit pushed to master at https://github.com/openshift/openshift-ansible https://github.com/openshift/openshift-ansible/commit/ead22bb1c3b6d6366502b14b97b7aae5605f8a58 Merge pull request #5518 from ingvagabund/set-quota-backend-bytes-explicitly Automatic merge from submit-queue set the etcd backend quota to 4GB by default Bug: 1492891 Verify this bug with openshift-ansible-3.7.0-0.143.2.git.0.39404c5.el7.noarch.rpm Etcd backend quota was set to 4GB by default now. [root@ip-172-18-9-157 ~]# grep ETCD_QUOTA_BACKEND_BYTES /etc/etcd/etcd.conf ETCD_QUOTA_BACKEND_BYTES=4294967296 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. https://access.redhat.com/errata/RHSA-2017:3188 The needinfo request[s] on this closed bug have been removed as they have been unresolved for 1000 days |