Install Alpine on LXD: Difference between revisions

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== LXD ==
== LXD ==


LXD is an easy to use daemon and client for managing LXC containers.  It is included by default in Ubuntu 16.04 and later versions.  It may become available in other distributions, such as debian.  If you are not familiar at all with LXC or LXD, start directly with LXD. For detailed instructions on how to use it, lookup Stéphane Graber's blog post series on LXD.
LXD is an easy to use daemon and client for managing LXC containers.  It is included by default in Ubuntu 16.04 and later versions.  It may become available in other distributions, such as debian.  If you are not familiar at all with LXC or LXD, start directly with LXD. For detailed instructions on how to use it, see https://linuxcontainers.org/lxd/introduction/


With LXD you can start an Alpine Linux container in seconds, in practically any Ubuntu 16.04 (or later) system, including:
With LXD you can start an Alpine Linux container in seconds, in practically any Ubuntu 16.04 (or later) system, including:
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* An Amazon EC2 instance
* An Amazon EC2 instance
* An OpenStack KVM VPS
* An OpenStack KVM VPS
With LXD, you can easily run Alpine in all those environments, on top of an Ubuntu Host.


These instructions assume you are running on an amd64 (x86_64) platform.
These instructions assume you are running on an amd64 (x86_64) platform.
== LXD installation ==
On Ubuntu 18.04 there are two versions of LXD available:
* From apt packages, included by default on a new installation
* From snap.  The snap version of LXD has a higher version and more features than the apt version.  Future versions of LXD will be distributed only via snap.
If you want to use the latest LXD, remove the apt version and install the snap version:
{{Cmd|sudo apt-get remove lxd lxd-client
sudo snap install lxd
}}
Add yourself to the lxd group, so you can run ''lxc'' without being root:
{{Cmd|sudo adduser `whoami` lxd}}
Then logout and login again.


== LXD configuration ==
== LXD configuration ==
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The ZFS storage method is recommended, because of its ability to create instant snapshots and copies of containers, but it requires additional configuration and it is not available everywhere (e.g. in a VPS host).  dir will do just fine for a demo.
The ZFS storage method is recommended, because of its ability to create instant snapshots and copies of containers, but it requires additional configuration and it is not available everywhere (e.g. in a VPS host).  dir will do just fine for a demo.


To change the networking configuration:
== Container creation ==
{{Cmd|sudo dpkg-reconfigure -p medium lxd}}


 
To install Alpine Linux 3.8 run:
== Container creation ==
{{Cmd|lxc launch images:alpine/3.8 a1}}


To install Alpine Linux edge version run:
To install Alpine Linux edge version run:
{{Cmd|lxc launch images:alpine/edge a1}}
{{Cmd|lxc launch images:alpine/edge a2}}
 
To install Alpine Linux 3.5 run:
{{Cmd|lxc launch images:alpine/3.5 a2}}
 


To enter a shell in the container:
To enter a shell in the container:
{{Cmd|lxc exec a1 ash}}
{{Cmd|lxc exec a1 ash}}
== Fixing the container ==
Once you create the container, edit /etc/inittab and comment out all lines that start with "tty".  Otherwise, the container will keep writing warnings on /var/log/messages.  Here's a script to automate this:
<pre>
#!/bin/sh
sed -i 's/^tty/# tty/g' /etc/inittab
# clean messages
rm /var/log/messages
</pre>
Let's say this script is called fixgetty.sh.  To copy it to the container, use the following:
{{Cmd|lxc file push fixgetty.sh a1/root/}}
After you fix /etc/inittab, reboot the container:
{{Cmd|reboot}}


== Networking ==
== Networking ==
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* On a LAN, it suffices to add a route through the host LXD node
* On a LAN, it suffices to add a route through the host LXD node
* Use an iptables configurator, such as shorewall
* Use an iptables configurator, such as shorewall
* For HTTP/HTTPS access, use an HTTP reverse proxy/load balancer, such as pound, to redirect HTTP requests to various containers.  You can run the HTTP reverse proxy in an Alpine container, once you redirect the ports that you want to it, (using iptables).
* For HTTP/HTTPS access, use an HTTP reverse proxy/load balancer, such as haproxy or pound, to redirect HTTP requests to various containers.  You can run the HTTP reverse proxy in an Alpine container, once you redirect the ports that you want to it, (using iptables).






[[Category:Virtualization]]
[[Category:Virtualization]]

Latest revision as of 20:43, 14 November 2020

LXD

LXD is an easy to use daemon and client for managing LXC containers. It is included by default in Ubuntu 16.04 and later versions. It may become available in other distributions, such as debian. If you are not familiar at all with LXC or LXD, start directly with LXD. For detailed instructions on how to use it, see https://linuxcontainers.org/lxd/introduction/

With LXD you can start an Alpine Linux container in seconds, in practically any Ubuntu 16.04 (or later) system, including:

  • A standalone system
  • An Amazon EC2 instance
  • An OpenStack KVM VPS

With LXD, you can easily run Alpine in all those environments, on top of an Ubuntu Host.

These instructions assume you are running on an amd64 (x86_64) platform.

LXD installation

On Ubuntu 18.04 there are two versions of LXD available:

  • From apt packages, included by default on a new installation
  • From snap. The snap version of LXD has a higher version and more features than the apt version. Future versions of LXD will be distributed only via snap.

If you want to use the latest LXD, remove the apt version and install the snap version:

sudo apt-get remove lxd lxd-client sudo snap install lxd

Add yourself to the lxd group, so you can run lxc without being root:

sudo adduser `whoami` lxd

Then logout and login again.

LXD configuration

Before you launch LXD containers, you must configure LXD:

sudo lxd init

Accept all the defaults. You can rerun this if you have no containers. The ZFS storage method is recommended, because of its ability to create instant snapshots and copies of containers, but it requires additional configuration and it is not available everywhere (e.g. in a VPS host). dir will do just fine for a demo.

Container creation

To install Alpine Linux 3.8 run:

lxc launch images:alpine/3.8 a1

To install Alpine Linux edge version run:

lxc launch images:alpine/edge a2

To enter a shell in the container:

lxc exec a1 ash

Networking

The container has outgoing access to the network, but no incoming public access, since it doesn't have a public ip. You can provide incoming access using several networking techniques:

  • On a LAN, it suffices to add a route through the host LXD node
  • Use an iptables configurator, such as shorewall
  • For HTTP/HTTPS access, use an HTTP reverse proxy/load balancer, such as haproxy or pound, to redirect HTTP requests to various containers. You can run the HTTP reverse proxy in an Alpine container, once you redirect the ports that you want to it, (using iptables).
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