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This page explains how to set up and run Launchpad (for development) inside an LXC container. LXC is the recommended environment for doing Launchpad development in; the core Launchpad team and CI infrastructure all use LXC extensively. If your setup permits it, you should use [[Running/LXD]] instead, which is the recommended setup and what most developers currently use.

= Why? =

Launchpad development setup makes significant changes to your machine; it's nice to be unaffected by those when you're not doing such development. Also, multiple containers can be used to work around Launchpad's limitations regarding concurrent test runs on a single machine.

These instructions should work Ubuntu 14.04 LTS or later, and with some adaptation on any Linux distribution that uses LXC 1.0.0 or later. Older versions of LXC are significantly less reliable and polished, so we recommend upgrading to 14.04 LTS and removing `/var/cache/lxc` to ensure a clean, working start.

= Create an LXC container =

 1. Install LXC's userspace tools.
sudo apt-get install lxc

 1. Create a container. You can use an HTTP proxy or alternate Ubuntu mirror by specifying an http_proxy or MIRROR environment variable after `sudo`. (amd64 works fine too, although it will use more RAM.)
sudo lxc-create -t ubuntu -n lpdev -- -r xenial -a i386 -b $USER

 1. Start the container in the background.
sudo lxc-start -n lpdev -d

 1. Find its IP address.
sudo lxc-ls --fancy
 1. `ssh -A IP_ADDRESS_FROM_LXC_LS` to connect to the container. Your username and password will match your account on the host system. If your SSH key is in your local `authorized_keys` file you shouldn't be prompted for a password, as your home directory (including public and private keys) is bind mounted into the container. The `-A` permits you to access Launchpad code hosting from within the container without needing to reenter passphrases.

 1. '''[Inside the container]''' Install Bazaar so you can run `rocketfuel-setup`.
 sudo apt-get install bzr

 1. '''[Inside the container]''' You can now follow the normal [[Running|LP installation instructions]]. Be warned that changes in your home directory will also be seen outside the container and vice versa. If your home directory already has a Launchpad work area set up you'll want to run `rocketfuel-setup --no-workspace` to avoid trying to recreate it, but all subsequent steps are still required.

 1. Follow [[Running/RemoteAccess]] to set up access from the host's applications to the container's Launchpad instance.

== Assigning a static IP to the container ==

If you would like to assign a static IP to the container via dhcp:

  1. In `/etc/default/lxc-net` ensure the following lines are uncommented:
  2. Create `/etc/lxc/dnsmasq.conf` and add the following line (change IP to suit):
  3. Stop '''all''' lxc containers (lxc-net may not correctly restart if any containers are running):
sudo lxc-stop --name lpdev
  4. Run `sudo service lxc-net restart` and start the container.

The lpdev container should restart with the specified IP.

Alternatively, a static IP can be configured directly in the container from `/var/lib/lxc/lpdev/rootfs/etc/network/interfaces`.

= Troubleshooting =

== launchpad-database-setup fails ==

PostgreSQL will fail to create a cluster during installation if your
locale is configured to something non-C but not supported by the
container, so you need to install the relevant language pack.

Modern LXC container templates do this automatically, but you will know
you need to do it manually if bzr or apt commands have been spewing locale

For instance, if your computer has a localised English locale, use this:

apt-get install language-pack-en

If you didn't install the language pack before running rocketfuel-setup,
you'll need to run `sudo pg_createcluster 9.3 main` afterwards to fix
the damage.