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Juju 1.x Cheatsheet

Sometimes you don't have all day to figure stuff out, here's a TLDR of how to use Juju. Remember you can always juju help and then any of these subcommands to get the help for the command.

Installing the PPA and all the goodies:

  • sudo add-apt-repository ppa:juju/stable && sudo apt-get update && sudo apt-get install juju juju-local juju-quickstart charm-tools
  • juju quickstart -i - prompts you for all your cloud credentials.
  • juju bootstrap -v - bootstrap a node (always -v so you can see what's going on, drop the -v when you get comfortable with juju, but juju bootstrap since 1.17.0 shows what's going on -v is really verbose at this point)
  • juju debug-log - open this in another terminal or tab, so you can see what juju is doing while you type other commands)

Using Juju

  • juju deploy servicename alias- deploy a service, alias is optional if you want to name it something. If you use aliases you need to refer to the service via the alias from then on:

            juju deploy mediawiki myawesomewiki
  • juju add-unit servicename - add a unit

  • juju add-unit -n 10 servicename - add 10 units.
  • juju deploy servicename --to # - deploy servicename to a specific machine #. Use 0 to deploy to the bootstrap node.
  • juju status - shows what's going on
  • juju status servicename - shows you what's going for a particular server
  • juju ssh servicename/machine# - ssh to a unit, get the # from juju status
  • juju ssh machine# - ssh to a machine number
  • juju run "uname -a" --all - Run a command (uname) on every instance. (1.17.2 and newer)

bundles

  • juju quickstart bundle:~abentley/wiki-bundle/1/wiki - Get the bundle address from jujucharms.com

Relations

  • juju add-relation $service1 $service2 - relate two services
  • juju destroy-relation $service1 $service2 - unrelate 2 services

Deploying to Containers, VMs, and metal

  • juju deploy servicename --to lxc:10 - Deploy service to a container on machine #10
  • juju deploy servicename --to kvm:10 - Deploy service to a KVM on machine #10
  • juju deploy servicename --to 10 - Deploy service to the raw bare metal on machine #10
  • juju deploy servicename --constraints instance-type=m1.small - Deploy to certain AWS types.

Working with Units

  • juju ssh servicename/# - ssh to a specific machine # for a service.
  • juju run --service servicename "uname -a" - run a command on all machines of a service and return results to the console (useful!)
  • juju scp file.sh servicename/0:/tmp - copy file.sh to /tmp on node 0 of servicename.

Destroying Stuff

  • juju destroy-environment $environment-name - destroy an environment
  • juju destroy-service $servicename - destroy a service, DOES NOT REMOVE THE MACHINE, you need to follow up:
  • juju destroy-machine # - destroy machine #

Writing Charms/Bundles

  • charm create foo - create a blank charm template
  • charm add tests - add tests to an existing charm
  • charm test -e $environment - executes all tests found in the charm tests directory in specified environment (amazon, hp, etc.).
  • charm add readme - add a readme template to an existing charm
  • charm proof - lint for charms
  • bundle proof - lint for bundles
  • juju debug-hooks - debug mode for charm writing, this will ssh you into the units and fire off a tmux session to debug (totally awesome, use this).

Clean up

Other

  • Listing of all the charms: https://jujucharms.com/fullscreen/search/?text=
  • juju status -e $environmentname - show me the status of another environment
  • juju switch $environmentname - switch to a different environment
  • juju add-machine - add a blank machine that you can mess with
  • juju ensure-availability - Ensures the state server is HA (+3 nodes) - you only really need this in production.

Useful LXC commands

sudo lxc-ls --fancy - show all the containers on your machine

Plugins

Install plugins:

git clone https://github.com/juju/plugins.git ~/.juju-plugins
echo 'PATH=$PATH:$HOME/.juju-plugins' >> ~/.bash_profile
source ~/.bash_profile
juju help plugins

Plugin Cheats:

  • juju pprint - prettier status, a must for large deployments
  • juju clean - reset and clean all LXC containers and the Juju local provider
  • juju git-deploy https://github.com/charms/haproxy - Deploy charms directly from a git repo.