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Update backups-and-disaster-recovery.md

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paigehargrave 2019-02-12 15:13:53 -05:00 committed by GitHub
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datacenter/ucp/3.0/guides/admin/backups-and-disaster-recovery.md
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@ -41,6 +41,17 @@ As part of your backup policy you should regularly create backups of UCP.
DTR is backed up independently.
[Learn about DTR backups and recovery](../../../../dtr/2.3/guides/admin/backups-and-disaster-recovery.md).
> Warning: On UCP versions 3.1.0 - 3.1.2, before performing a UCP backup, you must clean up multiple /dev/shm mounts in the ucp-kublet entrypoint script by running the following script on all nodes via cron job:
```
SHM_MOUNT=$(grep -m1 '^tmpfs./dev/shm' /proc/mounts)
while [ $(grep -cm2 '^tmpfs./dev/shm' /proc/mounts) -gt 1 ]; do
sudo umount /dev/shm
done
grep -q '^tmpfs./dev/shm' /proc/mounts || sudo mount "${SHM_MOUNT}"
```
For additional details, refer to [Docker issue 934](https://success.docker.com/article/more-than-one-dev-shm-mount-in-the-host-namespace){: target="_blank"}
To create a UCP backup, run the `{{ page.ucp_org }}/{{ page.ucp_repo }}:{{ page.ucp_version }} backup` command
on a single UCP manager. This command creates a tar archive with the
contents of all the [volumes used by UCP](../architecture.md) to persist data