Depooling servers
Contains various ways to depool different servers. In a glorious future, we'd just need to do conftool depool <service> <node>
but we aren't there yet!
cp*** machines
These are the varnish frontends, and should be depooled via conftool. To fully depool a server, do as root on any puppetmaster frontend:
confctl select dc=<dc>,cluster=<cluster-name>,name=cp*** set/pooled=no
You can find out <cluster-name>
from looking at conftool-data/nodes/
in the operations/puppet
repository.
An easier option is to ssh into the server and just run
$ sudo -i depool
To re-pool, run:
$ sudo -i pool
Note the use of sudo -i. depool needs environment variables to get access to etcd.
mw* machines (and others)
The mw* application servers and other servers managed via pybal/etcd are depooled by using conftool. This is documented at https://wikitech.wikimedia.org/wiki/LVS#Etcd_as_a_backend_to_Pybal_.28All_of_production.29