/LXC_Rootfs

LXC_Rootfs for CloudEngine Switches

Primary LanguageShell

Root filesystem building guide

What do you need for building a rootfs file?

A server which operation system is Ubuntu 14.04 or Debian 8.

How to build a rootfs file in a server?

  • Get a LXC_Rootfs directory with a shell script by git command.
    git clone https://github.com/HuaweiSwitch/LXC_Rootfs.git
  • Add permission for the LXC_Rootfs directory.
    chmod 777 -R LXC_Rootfs/
  • Configure repo and source of apt-get before building process.
    apt-get update
  • Install docker by install the docker-io package in server.
    apt-get install -y docker.io qemu qemu-user-static
  • Add the docker package links.
    ln -sf /usr/bin/docker.io /usr/local/bin/docker
  • Pull the specific image from a docker registry server, for example:1587/osc-builder.
    docker pull 1587/osc-builder
  • Launch a container which build by the image.
    sudo docker run -v ~/LXC_Rootfs:/data -v /dev:/dev -v /lib/modules/:/lib/modules/ --add-host='osc:127.0.0.1' --privileged -i -t 1587/osc-builder:latest /bin/bash
  • Enter into the /data/ directory and execute the shell script with the parameter to make file system folder.
    cd /data
    ./create_rootfs.sh {powerpc|armel} (PS: The passwd for osc-builder is osc-buidler.)
    Attention:If the architecture of device is arm, please choose the “armel” as parameter, otherwise choose the “powerpc”.
  • Install qemu and qemu-user-static package.     apt-get install qemu qemu-user-static
  • Install squashfs-tools package in server.
    apt-get install squashfs-tools
  • Create root file system into a rootfs file with sqfs format.
    mksquashfs {powerpc|armel}-rootfs/ rootfs.sqfs (PS: If the "armel" has been selected as a parameter, the command should be executed:chmod 100000:100000 -R rootfs/ before executing the mksquashfs command.)

How to start a lxc container with rootfs file in CE switch?

  • Transfer the rootfs file to CE switch.
    using ftp tools to transfer rootfs.sqfs from local computer to CE switch.
  • Load the lxc firmware with command.
    bash shell rootfs.sqfs
  • Enter the container with command.
    bash
  • Exit from the container.
    Ctrl + a q
  • Unable the container with command.
    undo bash shell rootfs.sqfs

Q&A

  • When you set or change your password for user in linux container with the armel rootfs, you may meet error information as below: passwd: System error passwd: password unchanged

To solve this problem, you should compile the passwd ball in armel cross compile tool again with "--without-libpam" and "--without-audit", which will be installed in linux container.

References

[1] For docker instruction: https://opensource.com/recources/what-docker

[2] For docker details: https://www.docker.com