Juju returns no cached images even though there are

[Haw Loeung]

Hi,

On an environment where the controller is running Juju 2.2.9, 'juju cached-images' returns nothing even though there are.

| prodstack-is@somehost:~$ juju cached-images
| No images to display.
| prodstack-is@somehost:~$ juju cached-images --series bionic
| No images to display.

Via the MongoDB shell, you can see that there are some:

| juju:PRIMARY> db.cloudimagemetadata.find({ series: 'bionic'})
| { "_id" : "daily:bootstack-ps45:bionic:amd64:::keystone catalog", "image_id" : "524c30cc-6936-4c40-a70d-1fc9cce4bc90", "stream" : "daily", "region" : "bootstack-ps45", "version" : "18.04", "series" : "bionic", "arch" : "amd64", "root_storage_size" : NumberLong(0), "date_created" : NumberLong("1524800885951272146"), "source" : "keystone catalog", "priority" : 20, "txn-revno" : NumberLong(2), "txn-queue" : [ ] }
| { "_id" : "released:bootstack-ps45:bionic:amd64:::keystone catalog", "image_id" : "4d86f175-43d7-40a1-a2b9-8cd8e91d629c", "stream" : "released", "region" : "bootstack-ps45", "version" : "18.04", "series" : "bionic", "arch" : "amd64", "root_storage_size" : NumberLong(0), "date_created" : NumberLong("1524861418065155195"), "source" : "keystone catalog", "priority" : 20, "txn-revno" : NumberLong(2), "txn-queue" : [ ] }

This was discovered when trying to remove cached OS images in Juju to work around that known caching bug.

[Haw Loeung (hloeung)]

Also, for future travellers, this command below (via MongoDB shell) removes the cached OS images:

| db.cloudimagemetadata.deleteMany({ series: 'bionic' })

[Anastasia (anastasia-macmood)]

@Haw Loeung (hloeung),

This indeed looks like a bug :(

However, since Juju 2.2.9, we have changed how we deal with OS images. We now expire them often - I think after 5 mins. So this issue should not affect any currently supported versions of Juju (2.3.x and 2.4.x).

Since we are also very unlikely to release another 2.2.x, I'll mark this report as Won't Fix.

I believe that we might still have a problem in that command if the expiration period is configurable. I'll mark the report as Incomplete in hopes to reproduce similar behavior in our current world :D

[Launchpad Janitor (janitor)]

[Expired for juju because there has been no activity for 60 days.]