Diff for "Running/LXC"

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⇤ ← Revision 21 as of 2011-06-22 06:02:31 →
Size: 3684
Editor: lifeless
Comment: i386 support
← Revision 80 as of 2012-01-10 15:42:57 → ⇥
Size: 8555
Editor: bac
Comment:
Deletions are marked like this. Additions are marked like this.
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## page was copied from Running/VirtualMachine
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 1. Do not have dnsmasq installed (it is not by default). (dnsmasq-base is o.k. as it will be installed by the next step anyway.) If you do, and you want to keep it, see the "Problems" section below for some workarounds.
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{{{
sudo apt-get install lxc		  {{{
sudo apt-get install lxc libvirt-bin
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 1. Work around Bug:800456
{{{
sudo apt-get install cgroup-bin
}}}

 1. Work around Bug:784093

{{{
sudo dd of=/etc/cgconfig.conf << EOF
mount {
 cpu = /sys/fs//cgroup/cpu;
 cpuacct = /sys/fs/cgroup/cpu;
 devices = /sys/fs/cgroup/cpu;
 memory = /sys/fs/cgroup/cpu;
}
EOF
sudo service cgconfig restart
}}}

 1. Work around Bug:798476 (optional if you run i386 or have a -tonne- of memory and don't care about 64-bit footprint.
    Grab the patch from the bug and apply it to /usr/lib/lxc/templates/lxc-lucid. If you're running i386 already or want a 64-bit lxc then do not pass arch= on the lxc-create command line.
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{{{  {{{
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 1. Create a container
{{{
sudo arch=i386 lxc-create -n lucid-test-lp -t lucid -f /etc/lxc/local.conf		  1. Create a container. In the following commands, replace ''$username'' with your username on the host.
 {{{
sudo lxc-create -t ubuntu -n lpdev -f /etc/lxc/local.conf -- -r lucid -a i386 -b $username
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    If you want to use a proxy
{{{
sudo arch=i386 http_proxy=http://host:port/ lxc-create -n lucid-test-lp -t lucid -f /etc/lxc/local.conf
    * Some people have used '''{{{-a i686}}}''' instead of '''{{{-a i386}}}''' on a 64 bit machine and it seems fine so far.

    * If you want a proxy:
 {{{
sudo http_proxy=http://host:port/ lxc-create -t ubuntu -n lpdev -f /etc/lxc/local.conf -- -r lucid -a i386 -b $username
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    And if you want to set a custom mirror, similar to http_proxy, but set MIRROR= instead.     * And if you want to set a custom mirror, similar to http_proxy, but set MIRROR= instead.
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 1. Start it
{{{
sudo lxc-start -n lucid-test-lp		  1. Start the container
 {{{
sudo lxc-start -n lpdev
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    The initial credentials are root:root.       1. '''[Inside the container]''' Log in as root (password "root").
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 1. To stop it log in and run 'poweroff -n'.     Alternatively, you can log in as your user, but without sudo powers (then use "su root" with password "root" to become root).
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 1. '''[Inside the container]''' Grab the ip address (handed out via libvirt's dhcp server) - you may wish to ssh in rather than using the console (seems to have better termcap experience).
 {{{
ip addr show dev eth0 | grep 'inet'
}}}
    Alternatively, if you add '192.168.122.1' (libvirt's dnsmasq default address) to your /etc/resolv.conf you can use:
 {{{
ssh <container-name>.
}}}
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 1. below this is not yet updated from the vm instructions     [XXX Another alternative may be to use avahi. This should be tested and documented if desired. {{{sudo apt-get install avahi-daemon}}} is the start...]
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 1. After its installed, connect to the image and install {{{acpid}}} and {{{openssh-server}}}  1. '''[Inside the container]''' The new container won't have your proxy / mirror settings preserved. Customise it at this point before going further if you care about this.
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 1. Use ssh-copy-id to copy your public key into the VM.  1. '''[Inside the container]''' Enable multiverse (rocketfuel-setup wants it, but no one has said why lately) and -updates. Here's an example minimal /etc/apt/sources.list.
 {{{
deb http://archive.ubuntu.com/ubuntu lucid main universe multiverse
deb http://archive.ubuntu.com/ubuntu lucid-updates main universe multiverse
deb http://archive.ubuntu.com/ubuntu lucid-security main universe multiverse
}}}
 If you are going to develop in this LXC you might very well want sources available. If so, add these too.
 {{{
deb-src http://archive.ubuntu.com/ubuntu lucid main universe multiverse
deb-src http://archive.ubuntu.com/ubuntu lucid-updates main universe multiverse
deb-src http://archive.ubuntu.com/ubuntu lucid-security main universe multiverse
}}}
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 1. ssh -A <vm IP address> to connect to the VM.  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}}}'''
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 1. {{{bzr whoami "Your Name <your.email@example.com>"}}} to set your bzr identity in the VM.     If your locale is not English, or if you want more details, try/read this.
 {{{
apt-get install bzr
# 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.
apt-get install language-pack-en
}}}
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 1. You can now follow the [[Getting|getting-started]] on LP instructions.  1. '''[Inside the container]''' Grant the user sudo rights:
 {{{
adduser $username sudo
}}}

 1. '''[Inside the container]''' Add their user group:
 {{{
 addgroup --gid NNN $username
 }}}
 where NNN is as reported by
 {{{
 groups $username
 }}}
 
 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. Start it up again - headless now, we have the ip address from before.
 {{{
sudo lxc-start -n lpdev -d
}}}

 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. 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. 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.

= Problems =

== rabbitmq does not start up ==

rabbitmq may fail to start up. If that happens it appears to be a [[http://lists.rabbitmq.com/pipermail/rabbitmq-discuss/2010-April/007024.html|mnesia glitch]] best sorted by zapping mnesia.
 {{{
sudo rm -rf /var/lib/rabbitmq/mnesia/rabbit/*
sudo service rabbit-mq start
}}}

== updating doesn't work ==

Updating deb packages with apt or aptitude in an LXC has a few issues as of this writing. One is already mentioned in the instructions above. This section records others, with workarounds.

[[Bug:892892|Bug 892892]] describes a problem upgrading mountall. Serge Hallyn reports that Stephane Graber has fixed this in Precise, and they will SRU it into Oneiric. A quick workaround is to specify that you don't want to upgrade this package, such as with "=" in aptitude. [Serge suggests that for a quick fix, we can just turn off the devices cgroup - edit the container's config and comment out all 'lxc.cgroup.devices =' lines, but gary was unable to get this to work.]

== lxc-create fails with errors that it is unable to access archive.ubuntu.com ==

See [[Bug:906500| bug 906500]]. gary_poster encountered this problem when trying to create a second lxc container. After trying more careful approaches to a solution, Serge Hallyn recommended that we just wipe out the lxc cache. "rm -rf /var/cache/lxc/*". This made the problem go away.

== 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 fails, complaining that there is "No such device" of "virbr0" ==

Do you have dnsmasq installed? If so, uninstall it, or do one of these two workarounds.

 1. Perhaps [[http://wiki.libvirt.org/page/Libvirtd_and_dnsmasq|this workaround]] will do the trick for you. If you have success, please record it here.

 1. Turn it off when you need lxc ('''{{{/etc/init.d/dnsmasq stop}}}'''). Then use '''{{{sudo virsh net-start default}}}''' and then retry. [[http://mytipsandtricson.blogspot.com/2010/12/kvm-failed-to-start-network-default-in.html|(Source)]]

Slightly more details: Normally, if you look at the "ifconfig" output in the host, you will see a virbr0 interface. If it is not there, you'll have problems. In that case, you'll probably also see that the virtual network is inactive (see the output of '''{{{virsh net-list --all}}}''').

== lxc-start hangs ==

[[http://paste.ubuntu.com/772517/|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.

== 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.
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See also this email thread about [[https://lists.launchpad.net/launchpad-dev/msg03456.html|running Launchpad in a virtual machine]], and this [[https://lists.launchpad.net/launchpad-dev/msg03454.html|discussion of the differences]] between running in a [[Running/Schroot|chroot]] environment and running a VM. [[Running/RemoteAccess]] has a discussion for how you can configure the VM to allow the host machine to access the web pages, etc.
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You can skip some manual steps of installing from an ISO using a command like this:

{{{
sudo ubuntu-vm-builder kvm lucid --domain vm --dest ~/vm/lp-dev \
 --hostname lp-dev \
 --mem 2048 --cpus 2 \
 --components main,universe,multiverse,restricted \
 --mirror http://10.113.3.35:3142/mirror.internode.on.net/pub/ubuntu/ubuntu \
 --libvirt qemu:///system \
 --debug -v \
 --ssh-user-key ~/.ssh/id_rsa.pub --ssh-key ~/.ssh/id_rsa.pub \
 --rootsize 24000 \
 --user $USER
}}}

After installation completes, it should show up in your virt-manager menu.

= In LXC =

It seems like it would be nice to run Launchpad in [[http://lxc.teegra.net/|LXC containers]]: they should be more efficient than a VM (especially with regard to memory and disk) but more isolated than a chroot. More testing or documentation is needed.		 You can also run in a [[Running/Schroot|chroot]] environment or a [[Running/VirtualMachine|VM]].

This page explains how to set up and run Launchpad (for development) inside a LXC.

Why?

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 container's can be used to work around this.

Make a LXC

  1. Do not have dnsmasq installed (it is not by default). (dnsmasq-base is o.k. as it will be installed by the next step anyway.) If you do, and you want to keep it, see the "Problems" section below for some workarounds.
  2. Install lxc 
    sudo apt-get install lxc libvirt-bin
  3. Create a config for your containers 
    sudo dd of=/etc/lxc/local.conf << EOF
lxc.network.type=veth
lxc.network.link=virbr0
lxc.network.flags=up
EOF

  4. Create a container. In the following commands, replace $username with your username on the host. 

    sudo lxc-create -t ubuntu -n lpdev -f /etc/lxc/local.conf -- -r lucid -a i386 -b $username

    • Some people have used -a i686 instead of -a i386 on a 64 bit machine and it seems fine so far.

    • If you want a proxy: 
    sudo http_proxy=http://host:port/ lxc-create -t ubuntu -n lpdev -f /etc/lxc/local.conf -- -r lucid -a i386 -b $username
    • And if you want to set a custom mirror, similar to http_proxy, but set MIRROR= instead.
  5. Start the container 
    sudo lxc-start -n lpdev
    • Ignore the warning about openssh crashing - it restarts on a later event.

  6. [Inside the container] Log in as root (password "root").

    • Alternatively, you can log in as your user, but without sudo powers (then use "su root" with password "root" to become root).

  7. [Inside the container] Grab the ip address (handed out via libvirt's dhcp server) - you may wish to ssh in rather than using the console (seems to have better termcap experience). 

    ip addr show dev eth0 | grep 'inet'
    • Alternatively, if you add '192.168.122.1' (libvirt's dnsmasq default address) to your /etc/resolv.conf you can use: 
    ssh <container-name>.

    • [XXX Another alternative may be to use avahi. This should be tested and documented if desired. sudo apt-get install avahi-daemon is the start...]

  8. [Inside the container] The new container won't have your proxy / mirror settings preserved. Customise it at this point before going further if you care about this.

  9. [Inside the container] Enable multiverse (rocketfuel-setup wants it, but no one has said why lately) and -updates. Here's an example minimal /etc/apt/sources.list. 

    deb http://archive.ubuntu.com/ubuntu lucid main universe multiverse
deb http://archive.ubuntu.com/ubuntu lucid-updates main universe multiverse
deb http://archive.ubuntu.com/ubuntu lucid-security main universe multiverse
    If you are going to develop in this LXC you might very well want sources available. If so, add these too. 
    deb-src http://archive.ubuntu.com/ubuntu lucid main universe multiverse
deb-src http://archive.ubuntu.com/ubuntu lucid-updates main universe multiverse
deb-src http://archive.ubuntu.com/ubuntu lucid-security main universe multiverse

  10. [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. 
    apt-get install bzr
# 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.
apt-get install language-pack-en

  11. [Inside the container] Grant the user sudo rights: 

    adduser $username sudo

  12. [Inside the container] Add their user group: 

     addgroup --gid NNN $username
    where NNN is as reported by 
     groups $username

  13. 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.

  14. Start it up again - headless now, we have the ip address from before. 
    sudo lxc-start -n lpdev -d

  15. 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.

  16. You can now follow the 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.

  17. 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.

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

updating doesn't work

Updating deb packages with apt or aptitude in an LXC has a few issues as of this writing. One is already mentioned in the instructions above. This section records others, with workarounds.

Bug 892892 describes a problem upgrading mountall. Serge Hallyn reports that Stephane Graber has fixed this in Precise, and they will SRU it into Oneiric. A quick workaround is to specify that you don't want to upgrade this package, such as with "=" in aptitude. [Serge suggests that for a quick fix, we can just turn off the devices cgroup - edit the container's config and comment out all 'lxc.cgroup.devices =' lines, but gary was unable to get this to work.]

lxc-create fails with errors that it is unable to access archive.ubuntu.com

See bug 906500. gary_poster encountered this problem when trying to create a second lxc container. After trying more careful approaches to a solution, Serge Hallyn recommended that we just wipe out the lxc cache. "rm -rf /var/cache/lxc/*". This made the problem go away.

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 fails, complaining that there is "No such device" of "virbr0"

Do you have dnsmasq installed? If so, uninstall it, or do one of these two workarounds.

  1. Perhaps this workaround will do the trick for you. If you have success, please record it here.

  2. Turn it off when you need lxc (/etc/init.d/dnsmasq stop). Then use sudo virsh net-start default and then retry. (Source)

Slightly more details: Normally, if you look at the "ifconfig" output in the host, you will see a virbr0 interface. If it is not there, you'll have problems. In that case, you'll probably also see that the virtual network is inactive (see the output of virsh net-list --all).

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.

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

Alternatively

You can also run in a chroot environment or a VM.