juju
juju is devops distilled.
Juju enables you to use Charms to deploy your application architectures to EC2, OpenStack, Azure, GCE, your data center, and even your own Ubuntu based laptop. Moving between models is simple giving you the flexibility to switch hosts whenever you want — for free.
For more information, see the docs.
Getting started
juju is written in Go (http://golang.org), a modern, compiled, statically typed,
concurrent language. This document describes how to build juju from source.
If you are looking for binary releases of juju, they are available in the snap store
snap install juju --classic
Installing Go
Juju's source code currently depends on Go 1.9. One of the easiest ways
to install golang is from a snap. You may need to first install
the snap client. Installing the golang
snap package is then as easy as
snap install go --classic
You can read about the "classic" confinement policy here
If you want to use apt, then you can add the juju-golang PPA and then run the following
sudo apt install golang-1.9
Alternatively, you can always follow the official binary installation instructions
Setting GOPATH
When working with the source of Go programs, you should define a path within
your home directory (or other workspace) which will be your GOPATH. GOPATH
is similar to Java's CLASSPATH or Python's ~/.local. GOPATH is documented
online at http://golang.org/pkg/go/build/ and inside the go tool itself
go help gopath
Various conventions exist for naming the location of your GOPATH, but it should
exist, and be writable by you. For example
export GOPATH=${HOME}/work
mkdir $GOPATH
will define and create $HOME/work as your local GOPATH. The go tool itself
will create three subdirectories inside your GOPATH when required; src, pkg
and bin, which hold the source of Go programs, compiled packages and compiled
binaries, respectively.
Setting GOPATH correctly is critical when developing Go programs. Set and
export it as part of your login script.
Add $GOPATH/bin to your PATH, so you can run the go programs you install:
PATH="$GOPATH/bin:$PATH"
Getting juju
The easiest way to get the source for juju is to use the go get command.
go get -d -v github.com/juju/juju/...
This command will checkout the source of juju and inspect it for any unmet
Go package dependencies, downloading those as well. go get will also build and
install juju and its dependencies. To checkout without installing, use the
-d flag. More details on the go get flags are available using
go help get
At this point you will have the git local repository of the juju source at
$GOPATH/src/github.com/juju/juju. The source for any dependent packages will
also be available inside $GOPATH. You can use git pull --rebase, or the
less convenient go get -u github.com/juju/juju/... to update the source
from time to time.
If you want to know more about contributing to juju, please read the
CONTRIBUTING companion to this file.
Installing prerequisites
Runtime Dependencies
You can use make install-dependencies or, if you prefer to install
them manually, check the Makefile target.
This will add some PPAs to ensure that you can install the required golang and mongodb-server versions for precise onwards, in addition to the other dependencies.
Build Dependencies
Before you can build Juju, see
Dependency management section of
CONTRIBUTING to ensure you have build dependencies setup.
Building juju
go install -v github.com/juju/juju/...
Will build juju and install the binary commands into $GOPATH/bin. It is likely
if you have just completed the previous step to get the juju source, the
install process will produce no output, as the final executables are up-to-date.
If you do see any errors, there is a good chance they are due to changes in
juju's dependencies. See the
Dependency management section of
CONTRIBUTING for more information on getting the dependencies right.
Using juju
After following the steps above you will have the juju client installed in
GOPATH/bin/juju. You should ensure that this version of juju appears earlier
in your path than any packaged versions of juju, or older Python juju
commands. You can verify this using
which juju
You should be able to bootstrap a local model now with the following:
juju bootstrap localhost
Installing bash completion for juju
make install-etc
Will install Bash completion for juju cli to /etc/bash_completion.d/juju. It does
dynamic completion for commands requiring service, unit or machine names (like e.g.
juju status , juju ssh , juju terminate-machine <machine#>, etc),
by parsing cached juju status output for speedup. It also does command flags
completion by parsing juju help ... output.
Building Juju as a Snap Package
Building
Make sure your snapcraft version is >= 2.26. Run snapcraft at the root of the repository. A snap will build.
Current State
Classic mode.
Known Issues
None. The snap shares your current credentials and environments as expected with a debian installed version.
Needed for confinement
To enable strict mode, the following bugs need to be resolved, and the snap updated accordingly.
- Missing support for abstract unix sockets (https://bugs.launchpad.net/snappy/+bug/1604967)
- Needs SSH interface (https://bugs.launchpad.net/snappy/+bug/1606574)
- Bash completion doesn't work (https://launchpad.net/bugs/1612303)
- Juju plugin support (https://bugs.launchpad.net/juju/+bug/1628538)