Commit Graph

5 Commits

Author SHA1 Message Date
Mehran Kholdi
d1c0d49cf0 Support online volume expansion
Summary:
Online volume expansion is a 2 phase process:

1. The backing storage, in this case the raw file, needs to be resized. (i.e. `truncate -s`)
2. The node should be notified, so that it can both refresh its device capacity (i.e. `losetup -c`) and resize the filesystem (`resize2fs`) accordingly.

Although in our case both steps could be performed on the node itself, for the sake of following the semantics of how volume expansion works, we perform step 1 from the controller, and step 2 from the node.

Also, the `external-resizer` component is added which watches for PVC size updates, and notifies the CSI controller about it.

Test Plan:
Setup:
- Deploy
- Create a rawfile-backed pvc, and attach a Deployment to it
- Keep an eye on `rawfile` pod logs in `kube-system` namespace to see if any errors pop out during all scenarios

Scenario 1:
- Increase the size of the pvc
- Exec into the pod and verify that the volume is resized indeed (using `df`)

Scenario 2:
- Decrease deployment's replica to 0
- Increase the size of the pvc. Wait for a couple of minutes.
- Increase deployment's replica to 1
- Exec into the pod and verify that the volume is resized indeed.

Reviewers: bghadiri, mhyousefi, h.marvi, sina_rad

Reviewed By: bghadiri, mhyousefi, sina_rad

Differential Revision: https://phab.hamravesh.ir/D817
2020-06-14 03:35:17 +04:30
Mehran Kholdi
46bd3565a0 Use immutable tags for running tasks
This way we can run tasks with `IfNotPresent` and be sure it works as intended.
2020-05-29 21:04:40 +04:30
Mehran Kholdi
b49f8304f5 Add component label to controller service 2020-05-03 19:28:55 +04:30
Mehran Kholdi
a2fdcb9756 Deploy controller using statefulset instead of deployment
So that no two controllers are running simultaneously.
2020-04-28 22:54:38 +04:30
Mehran Kholdi
420b0f4ff7 Create helm chart 2020-04-28 22:54:38 +04:30