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| This page explains how to set up and run Launchpad (for development) inside a LXC. | This page explains how to set up and run Launchpad (for development) inside an LXC container. |
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| Launchpad development setup makes significant changes to your machine; its nice to be unaffected by those except when you are actually doing such development. Also, Launchpad has some limitations on concurrent testing per-machine and so forth - multiple containers can be used to work around this. | 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. |
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| These instructions should work on Ubuntu 12.04 LTS and later. If you've used a version of LXC older than 12.04 LTS's final release on your development machine, you'll want to remove `/var/cache/lxc` first to ensure that you don't have a broken cache. | These instructions should work on Ubuntu 12.04 LTS and later. Older versions of LXC are significantly less reliable and polished, so if you've used a version of LXC older than 12.04 LTS's final release on your development machine, you'll want to remove `/var/cache/lxc` first to ensure that you don't have a broken cache. |
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| 1. Install lxc | 1. Install LXC's userspace tools. |
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| 1. Create a container. In the following commands, replace ''$username'' with your username on the host. | 1. Create a container. You might want to use an HTTP proxy or alternate Ubuntu mirror; you can do this by specifying an http_proxy or MIRROR environment variable after `sudo`. |
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| sudo lxc-create -t ubuntu -n lpdev -- -r lucid -a i386 -b $username | sudo lxc-create -t ubuntu -n lpdev -- -r lucid -a i386 -b $USER |
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| * If you want a proxy: {{{ sudo http_proxy=http://host:port/ lxc-create -t ubuntu -n lpdev -- -r lucid -a i386 -b $username }}} * And if you want to set a custom mirror, similar to http_proxy, but set MIRROR= instead. 1. Start the container |
1. Start the container. You'll probably see a few early warnings about boot processes dying -- they're normal and can be ignored as long as you end up at a login prompt. |
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| Ignore the warning about openssh crashing - it restarts on a later event. | |
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| 1. '''[Inside the container]''' Grab the IP address (handed out via LXC's dnsmasq DHCP server) - you may wish to SSH in rather than using the console (seems to have better termcap experience). | 1. '''[Inside the container]''' Get the container's IP address from the console. You'll generally want to `ssh` in for convenience and better termcap functionality, and the default Ubuntu LXC dnsmasq setup doesn't provide name resolution from the host |
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| 1. '''[Inside the container]''' Install some additional packages we'll need to run rocketfuel-setup etc. Most people with an English locale will simply want to do this: `apt-get install bzr language-pack-en` If your locale is not English, or if you want more details, try/read this. |
1. '''[Inside the container]''' Install some additional packages needed before running `rocketfuel-setup` and the rest of the Launchpad setup process. |
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| # rocketfuel-setup assumes that bzr is already installed. | |
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| # if you have a localised (non-C) locale: # not doing this will cause postgresql to fail to install, with -hilarious- results as database-developer-setup will think you have 8.2 installed. # You can tell if you need this if the prior apt commands spewed locale warnings. # Pick your specific language pack. |
# PostgreSQL will fail to create a cluster during installation if your # locale is configured but not supported by the container, so install # the relevant language pack (this example is only good for English). # You need to do this if the prior apt commands spewed locale warnings. # # If you didn't do this before running rocketfuel-setup, you'll want # to run `sudo pg_createcluster 8.4 main` afterwards to fix the damage. |
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| 1. To stop it now run 'poweroff' in the lxc container. If it works smoothly, you will eventually be dumped back out to your host system. If it looks like it is hanging, then use "{{{sudo lxc-stop -n lpdev}}}" in the host. | 1. '''[Inside the container]''' Shut down by running `poweroff` inside the container, and you should eventually be dumped back out to your host system. If it looks like it's hanging, force it to stop with `sudo lxc-stop -n lpdev` on the host. |
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| 1. Start it up again, headless this time (-d). The previous IP address will be used. | 1. Start it up again, headless this time (`-d`). The same IP address will be used, so you don't need console access. |
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| 1. ssh <vm IP address> to connect to the VM. Your ssh key is already present because of the bind mount to your home dir, though using ssh -A might give you a better ssh agent experience. | 1. `ssh <IP address obtained above>` to connect to the VM. 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. `ssh -A` might give you a better agent experience when dealing with Launchpad code hosting. |
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| 1. You can now follow the [[Getting|getting-started]] on LP instructions. Be warned that changes in ~ will affect you outside the container. You will want to run rocketfuel-setup with --no-workspace if your home already has a workarea. You may need to run utilities/launchpad-database-setup separately too. | 1. '''[Inside the container]''' You can now follow the normal [[Getting|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. |
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| 1. You probably want to follow [[Running/RemoteAccess]] has a discussion for how you can configure things so your non-container browser can access web pages from within the container. | 1. Follow [[Running/RemoteAccess]] to set up access from the host's applications to the container's Launchpad instance. |
This page explains how to set up and run Launchpad (for development) inside an LXC container.
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 on Ubuntu 12.04 LTS and later. Older versions of LXC are significantly less reliable and polished, so if you've used a version of LXC older than 12.04 LTS's final release on your development machine, you'll want to remove /var/cache/lxc first to ensure that you don't have a broken cache.
Make a LXC
- Install LXC's userspace tools.
sudo apt-get install lxc
Create a container. You might want to use an HTTP proxy or alternate Ubuntu mirror; you can do this by specifying an http_proxy or MIRROR environment variable after sudo.
sudo lxc-create -t ubuntu -n lpdev -- -r lucid -a i386 -b $USER
- Start the container. You'll probably see a few early warnings about boot processes dying -- they're normal and can be ignored as long as you end up at a login prompt.
sudo lxc-start -n lpdev
[Inside the container] Log in with your normal username and password. You'll have full sudo powers.
[Inside the container] Get the container's IP address from the console. You'll generally want to ssh in for convenience and better termcap functionality, and the default Ubuntu LXC dnsmasq setup doesn't provide name resolution from the host
ip addr show dev eth0 | grep 'inet'
[Inside the container] Install some additional packages needed before running rocketfuel-setup and the rest of the Launchpad setup process.
# rocketfuel-setup assumes that bzr is already installed. apt-get install bzr # PostgreSQL will fail to create a cluster during installation if your # locale is configured but not supported by the container, so install # the relevant language pack (this example is only good for English). # You need to do this if the prior apt commands spewed locale warnings. # # If you didn't do this before running rocketfuel-setup, you'll want # to run `sudo pg_createcluster 8.4 main` afterwards to fix the damage. apt-get install language-pack-en
[Inside the container] Shut down by running poweroff inside the container, and you should eventually be dumped back out to your host system. If it looks like it's hanging, force it to stop with sudo lxc-stop -n lpdev on the host.
Start it up again, headless this time (-d). The same IP address will be used, so you don't need console access.
sudo lxc-start -n lpdev -d
ssh <IP address obtained above> to connect to the VM. 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. ssh -A might give you a better agent experience when dealing with Launchpad code hosting.
[Inside the container] You can now follow the normal 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.
Follow Running/RemoteAccess to set up access from the host's applications to the container's Launchpad instance.
Problems
rabbitmq does not start up
rabbitmq may fail to start up. If that happens it appears to be a mnesia glitch best sorted by zapping mnesia.
sudo rm -rf /var/lib/rabbitmq/mnesia/rabbit/* sudo service rabbit-mq start
database-developer-setup fails, and thinks you are on Postgres 8.2
As noted above, if you have a localised (non-C) locale, you need to install your specific language pack. For instance, if your computer has a localised English locale, use this:
apt-get install language-pack-en
lxc-start hangs
The symptom looks like this. It hangs after that.
No fix or workaround identified yet, other than making a new lxc container.
To debug, try lxc-start -n $containername -l debug -o outout and look at outout.
DNS fails inside the container
After restarting in daemon mode and logging in as a regular user, DNS was not working. Ensure there is a nameserver in the container's /etc/resolv.conf, which is created at startup by resolverconf. Stopping and starting the container solved the problem.
Random flakiness
Using lxc via juju I ran into all sorts of problems with DNS, version mismatches, etc. Since it was via juju I wasn't able to muck around with /etc/resolv.conf (the damage was done before I got the chance to ssh to the guest.) I found sudo rm -rf /var/cache/lxc solved the problem. It is rather brutal but worked. Of course the next run took a long time as all of that previously cached stuff had to be refetched.
Other problems
If other lxc users don't have an idea (known lxc users as of this writing include lifeless, wgrant, frankban and gary_poster) try asking hallyn or Spamaps on #ubuntu-server on freenode.
References
