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howtos:misc:lxc [2018/09/15 20:54 (UTC)]
montagdude [Network] Clarify that lxcpath is a variable
howtos:misc:lxc [2019/12/28 02:27 (UTC)]
montagdude Add running GUI applications
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 slackpkg install slackware64 slackpkg install slackware64
 </​code>​ </​code>​
 +
 +==== Custom Container Boot Process ====
 +
 +In order to customize the boot process you can add or modify the init scripts listed in /​usr/​share/​lxc/​scripts/​slackware. ​ Any changes you make to the existing scripts will be copied to /etc/rc.d/ in each freshly created LXC container. ​ This will allow you to easily customize the boot process if you create many LXC containers. ​ A good example is if you add a custom rc.inet1.conf. ​ It can become a bit tedious if you wish to create several LXC containers that all use DHCP network addressing. ​ The solution is to create your own rc.inet1.conf,​ set **USE_DHCP[0]="​yes"​**,​ named it rc.inet1.conf.lxc,​ and save it in /​usr/​share/​lxc/​scripts/​slackware. ​ Your custom rc.inet1.conf will be copied to each new container.
  
 ==== Sharing Directories with the Host ==== ==== Sharing Directories with the Host ====
  
-Because an LXC container'​s filesystem is just a directory on the host, if you only need to transfer files from the host to the container, you can simply copy them over. However, often you will want to share the files both ways, or rather, be able to access //the same files// within the container without having to actually transfer anything, and this is a little more difficult ​because ​the container ​is isolated. LXC provides utilities to mount host directories on containers for this purpose. We will assume that the directory to be shared is at /​home/​username/​foo on the host. To share a user directory with the host, first log into the container and create the top-level of the directory to be shared. Then log out and stop the container. Add the following lines to the container'​s config file (lxcpath/​container_name/​config):​+Because an LXC container'​s filesystem is just a directory on the host, if you only need to transfer files from the host to the container, you can simply copy them over. However, often you will want to share the files both ways, or rather, be able to access //the same files// within the container without having to actually transfer anything, and this is a little more difficult ​due to the isolation of the container. LXC provides utilities to mount host directories on containers for this purpose. We will assume that the directory to be shared is at /​home/​username/​foo on the host. To share a user directory with the host, first log into the container and create the top-level of the directory to be shared. Then log out and stop the container. Add the following lines to the container'​s config file ($lxcpath/​container_name/​config):​
  
 <​code>​ <​code>​
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 Note that the second path intentionally lacks a leading slash. This is because it is a relative path -- relative to the container'​s rootfs. Once you start the container again and log in, you should see that the directory has been mounted at /​home/​container_user/​foo. In general, it is best if the username on the host is the same as the container'​s username, because it avoids any conflicts in file ownership between the host and container user. Note that the second path intentionally lacks a leading slash. This is because it is a relative path -- relative to the container'​s rootfs. Once you start the container again and log in, you should see that the directory has been mounted at /​home/​container_user/​foo. In general, it is best if the username on the host is the same as the container'​s username, because it avoids any conflicts in file ownership between the host and container user.
 +
 +==== Running GUI Applications ====
 +
 +Without taking additional steps, it will not be possible to run GUI applications installed in the container. The simplest way to accomplish this is to run them using SSH with X forwarding to the host. However, there are still a few steps required to make this happen. In the container, in /​etc/​ssh/​sshd_config,​ set the following:
 +
 +<​code>​
 +X11Forwarding yes                                                                                                                      ​
 +X11UseLocalhost yes
 +</​code>​
 +
 +This will allow X forwarding via SSH from the container. (Note: X11UseLocalhost yes is required; otherwise X will give an error about the DISPLAY not existing.) It is also necessary to bind-mount the host's /​tmp/​.X11-unix directory in the container. Add this line to the container'​s config file ($lxcpath/​container_name/​config):​
 +
 +<​code>​
 +lxc.mount.entry = /​tmp/​.X11-unix tmp/​.X11-unix none bind,​optional,​create=dir
 +</​code>​
 +
 +Next, restart the container. Upon restart, use `lxc-ls --fancy` to determine the container'​s IP address. You can then run GUI apps from the container as follows:
 +
 +<​code>​
 +ssh -Y user@IP appname
 +</​code>​
 +
 +This is probably the simplest way to run GUI apps in the container. However, more advanced usage is possible, including using LXC to "​sandbox"​ applications in an unprivileged container and/or running GUI applications directly in the container without connecting over SSH. For more information,​ the following page is a good start:
 +
 +[[https://​stgraber.org/​2014/​02/​09/​lxc-1-0-gui-in-containers/​|LXC 1.0: GUI in containers [9/10]]]
  
 ====== See Also ====== ====== See Also ======
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 [[https://​www.linuxquestions.org/​questions/​slackware-14/​starting-lxc-container-in-slackware-14-2-a-4175614421/​|LQ thread]] [[https://​www.linuxquestions.org/​questions/​slackware-14/​starting-lxc-container-in-slackware-14-2-a-4175614421/​|LQ thread]]
 +
 +[[https://​stgraber.org/​2014/​02/​09/​lxc-1-0-gui-in-containers/​|LXC 1.0: GUI in containers [9/10]]]
  
 ====== Sources ====== ====== Sources ======

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