changing the cloud URL on a live controller via cli

[Dmitrii Shcherbakov]

I recently upgraded MAAS as follows: 2.3.x -> 2.4.x -> 2.5.x and in that process the URL to access MAAS has changed (see lp:1804070).

After that a Juju controller (2.4.1) partially continued functioning (status worked but I could not ssh into any machine).

ubuntu@maas:~$ juju ssh neutron-openvswitch/0
ERROR opening environment: could not connect to MAAS controller - check the endpoint is correct (not supported)

There doesn't seem to be a command to update an endpoint of an existing cloud (update-clouds only works for public clouds).

I did some database surgery which worked but I think the same needs to be supported via CLI.

# ssh to the controller
ssh ubuntu@192.0.2.60

root@controller-juju:~# conf=/var/lib/juju/agents/machine-*/agent.conf
root@controller-juju:~# user=`sudo grep tag $conf | cut -d' ' -f2`
root@controller-juju:~# password=`sudo grep statepassword $conf | cut -d' ' -f2`
root@controller-juju:~# mongodb --host 127.0.0.1 --port 37017 --authenticationDatabase admin --ssl --sslAllowInvalidCertificates --username "$user" --password "$password"

root@controller-juju:~# /usr/lib/juju/mongo3.2/bin/mongo --host 127.0.0.1 --port 37017 --authenticationDatabase admin --ssl --sslAllowInvalidCertificates --username "$user" --password "$password"
MongoDB shell version: 3.2.15
connecting to: 127.0.0.1:37017/test
2018-11-25T13:40:19.983+0000 W NETWORK [thread1] SSL peer certificate validation failed: unable to get local issuer certificate
2018-11-25T13:40:19.983+0000 W NETWORK [thread1] The server certificate does not match the host name 127.0.0.1
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
 http://docs.mongodb.org/
Questions? Try the support group
 http://groups.google.com/group/mongodb-user
Server has startup warnings:
2018-08-08T20:59:31.952+0000 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2018-08-08T20:59:31.952+0000 I CONTROL [initandlisten]
2018-08-08T20:59:31.953+0000 I CONTROL [initandlisten]
2018-08-08T20:59:31.953+0000 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 20000 processes, 65000 files. Number of processes should be at least 32500 : 0.5 times number of files.
juju:PRIMARY> use juju;
switched to db juju

juju:PRIMARY> db.clouds.find({"_id": "samaas"})
{ "_id" : "samaas", "name" : "samaas", "type" : "maas", "auth-types" : [ "oauth1" ], "endpoint" : "http://192.0.2.2/MAAS/", "txn-revno" : NumberLong(2), "txn-queue" : [ ] }

juju:PRIMARY> db.clouds.find({"_id": "samaas"})
{ "_id" : "samaas", "name" : "samaas", "type" : "maas", "auth-types" : [ "oauth1" ], "endpoint" : "http://192.0.2.2:5240/MAAS/", "txn-revno" : NumberLong(2), "txn-queue" : [ ] }

[Richard Harding (rharding)]

There's some existing work around allowing updating clouds/credentials that this would fall under. The biggest thing will be distributing changes to new users/etc. Will include this as a test case under that work.