1255417 - [mozillians.org] Fix KEY_PREFIX in django cache settings

Status: RESOLVED FIXED

(Infrastructure & Operations Graveyard :: WebOps: Community Platform, task)

Description

[John Giannelos [:nemo-yiannis]]

While debugging an issue in mozillians-dev.allizom.org it turned out that there is a misconfiguration in mozillians CACHE settings.

* We need to make sure that CACHE entry in mozillians/settings/local.py has KEY_PREFIX defined eg.
 * mozillians_dev_allizom_org
 * mozillians_allizom_org
 * mozillians_org

For more information regarding the format see the example here [1].

* We need to remove the CACHE_MIDDLEWARE_KEY_PREFIX entry from the configuration since we are not using it and it's kind of misleading regarding the memcache prefix.

Thank you!

[1] https://pastebin.mozilla.org/8863089

Comment 1

[Eric Ziegenhorn :ericz]

That pastebin expired.

Comment 2

[Eric Ziegenhorn :ericz]

So to be clear I'm changing the existing CACHE_MIDDLEWARE_KEY_PREFIX setting name to KEY_PREFIX for all mozillians environments.  And the values should remain the same: 'mozillians_org' for prod, mozillians_allizom_org for stage and mozillians_dev_allizom_org for dev.  Is that correct?

Comment 3

[John Giannelos [:nemo-yiannis]]

Sorry for the expired pastebin :\

Here is the example conf:
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
        'LOCATION': '<URIs>',
        'KEY_PREFIX': '<KEY_PREFIX>'
    }
}

These are the changes we should do:

* Configure the `KEY_PREFIX` entry on each env (dev/stage/prod) (it should be the same value with CACHE_MIDDLEWARE_KEY_PREFIX)
* Remove the CACHE_MIDDLEWARE_KEY_PREFIX config entry

Comment 4

[John Giannelos [:nemo-yiannis]]

Also can we verify these on dev/stage first and then apply it on prod? It is not going to cause any downtime but let's make sure that these config changes work as expected.

Comment 5

[Eric Ziegenhorn :ericz]

dev and stage settings changed and deployed, please test.

Comment 6

[John Giannelos [:nemo-yiannis]]

Everything looks OK on dev/stage. Let's change the settings on prod.

Comment 7

[Eric Ziegenhorn :ericz]

Changed setting and deployed on prod as well.