GabrielBrascher edited a comment on issue #4498:
URL: https://github.com/apache/cloudstack/issues/4498#issuecomment-732977112
@rhtyd ceph snapshot work really well indeed; however, it throws an
exception when taking RBD volume snapshots in case of the Zone has
`snapshot.backup.to.secondary` set to **true**.
#### Scenario where it can happen:
For instance, if there is a zone with local storage, NFS, and RBD as primary
storage pools it could be interesting to have `snapshot.backup.to.secondary`
enabled (at least for the local storage and NFS). The problem is that if backup
is enabled then all RBD snapshots fail. At least it should allow the snapshot
and then raise a warn such as _"backup on secondary pool is not supported for
RBD snapshots, RBD snapshots will remain only on the primary storage"_.
#### Exception example:
For now it fails as it tries to access the RBD storage pool locally, failing
to parse configuration files and pool the path.
```
2020-11-20 20:23:59,916 ERROR [o.a.c.s.v.VolumeServiceImpl]
(Work-Job-Executor-4:ctx-3de4fd53 job-57289/job-57290 ctx-3e53cbdd)
(logid:05d7071d) Take snapshot: 12888 failed
com.cloud.utils.exception.CloudRuntimeException:
org.apache.cloudstack.utils.qemu.QemuImgException: 2020-11-20 20:23:18.810175
7f96fa5b48c0 -1 Errors while parsing config file!2020-11-20 20:23:18.810179
7f96fa5b48c0 -1 parse_file: cannot open /etc/ceph/ceph.conf: (2) No
such file or directory2020-11-20 20:23:18.810181 7f96fa5b48c0 -1 parse_file:
cannot open ~/.ceph/ceph.conf: (2) No such file or directory2020-11-20
20:23:18.810182 7f96fa5b48c0 -1 parse_file: cannot open ceph.conf: (2) No such
file or directoryqemu-img: Could not open 'r
bd:rbd/9aaef3ea-4d3a-40d0-ab36-5e3db7393a50@28d4acf2-6886-4da1-925e-62910dcf2fd4:mon_host=ceph.address\\:6789:auth_supported=cephx:id=cloudstack:key=BGCADKsHdh7BWChDABVsp5WHinnDCBOZ91dHfgw==:rbd_default_format=2:client_mount_timeout=30':
invalid conf option Н�I^]
V: No such file or directory
at
org.apache.cloudstack.storage.snapshot.SnapshotServiceImpl.backupSnapshot(SnapshotServiceImpl.java:301)
at
org.apache.cloudstack.storage.snapshot.DefaultSnapshotStrategy.backupSnapshot(DefaultSnapshotStrategy.java:171)
```
#### Proposal of next steps:
There is two things that can be done:
**A.** fix the handling allowing multiple stortage pools to handle snapshot
backup, as described above;
**B.** evaulate alternatives to implement RBD snapshots backup.
My proposal: I will check first the alternative **A** as a bug fix, creating
a PR (for 4.15.1, or 4.16?). Later I can evaluate viability of implementing
**B** as a new feature.
**Note:** I do not consider this issue a blocker for 4.15.
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