andyfan
2017-02-01 13:28:53 +08:00
Problems Encountered
LVM snapshots are by default only taken once every 24 hours. YP happened to run one manually about 6 hours prior to the outage
Regular backups seem to also only be taken once per 24 hours, though YP has not yet been able to figure out where they are stored. According to JN these don ’ t appear to be working, producing files only a few bytes in size.
SH: It looks like pg_dump may be failing because PostgreSQL 9.2 binaries are being run instead of 9.6 binaries. This happens because omnibus only uses Pg 9.6 if data/PG_VERSION is set to 9.6, but on workers this file does not exist. As a result it defaults to 9.2, failing silently. No SQL dumps were made as a result. Fog gem may have cleaned out older backups.
Disk snapshots in Azure are enabled for the NFS server, but not for the DB servers.
The synchronisation process removes webhooks once it has synchronised data to staging. Unless we can pull these from a regular backup from the past 24 hours they will be lost
The replication procedure is super fragile, prone to error, relies on a handful of random shell scripts, and is badly documented
Our backups to S3 apparently don ’ t work either: the bucket is empty
官方公告提供的信息, 六个备份服务器五个不工作, 说明了定期灾演的重要性啊