juju tips

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Add Specified Machine

We could add the specified name of the machine:

$ juju add-machine MaasOpenContrail6.maas

While the name of MaasOpenContrail6.maas is the name which we could get from the MAAS webUI.

Get/Set Constraints

We could dynamically set constraints for adding/removing new machines or unit, get/set it via:

$ juju get-constraints
mem=3072M
$ juju set-constraints "mem=1024M"
$ juju get-constraints
mem=1024M

Tags

Sometimes we need to add tags to specified maas units, the following webpage is for reference:
http://en.community.dell.com/techcenter/os-applications/w/wiki/7432.using-tags-with-maas-and-juju-in-ubuntu-server-14-04-lts
https://maas.ubuntu.com/docs/tags.html

Remove specified service

Get the status of the specified service via:

$ juju status neutron-api
services:
  neutron-api:
    charm: cs:trusty/neutron-api-9
    exposed: false
    life: dying
    units:
      neutron-api/0:
        agent-state: error
        agent-state-info: 'hook failed: "install"'
        agent-version: 1.21.3.1
        life: dying
        machine: "6"
        public-address: MaasOpenContrail7.maas
networks:
  maas-eth0:
    provider-id: maas-eth0
    cidr: 10.17.17.0/24

Resolved this service’s located units first:

Trusty@MassController:~/Code/deploy$ juju resolved neutron-api/0

Now remove the service via:

Trusty@MassController:~/Code/deploy$ juju remove-service neutron-api

Sometimes you need to type in resolved the unit for several times.
Finally, if your machine runs into error state, you could destroy it forcely via:

$ juju destroy-machine x --force