I am currently setting up a POC network of dockerised services using DC/OS. As this is a POC, I have had to make many revisions to the containers in order to get things working.
Consequently, when drilling into some services using the DC/OS (v1.8.7) web UI, I can see hundreds of old tasks - the vast majority of which have a status of 'finished'.
I realise that I can filter out and just see the 'active' containers by clicking on the appropriate tab, but this is not what I am after because I would like to be able to see when a container is staging, and also - all the history for the finished tasks is worthless to me.
How do I purge DC/OS of these finished tasks, as they are clogging up the UI?
Is there a CLI command for this, or do I have to clear out stuff on the master nodes... or is there an handy plug-in that will manage this for me? I've been looking around both on the web and the master nodes, but can't work out what I need to do.
In DC/OS 1.8.x there is no UI or CLI method to influence garbage collection. You can however, with a custom install, influence some parameter, such as gc_delay (default value: 2 days in DC/OS) and others are using the Mesos defaults, like gc_disk_headroom (which is unchanged set to 0.1, which means, Mesos targets to have 10% of the assigned disk as free space).
For parameters you can change at install time see the Install Configuration Parameters docs for more details.