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    Installing LXC on CentOS 7

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    • A
      Alex Sage
      last edited by Alex Sage

      First, let's make sure we have all the latest packages.

      yum -y update

      Now we can install LVX

      yum install lxc lxc-templates libvirt

      Start libvirtd

      systemctl start libvirtd

      Now let's create our first container

      lxc-create -n <name> -t download

Setting up the GPG keyring
Downloading the image index

---
DIST    RELEASE ARCH    VARIANT BUILD
---
centos  6       amd64   default 20160311_02:16
centos  6       i386    default 20160311_02:16
centos  7       amd64   default 20160311_02:16
debian  jessie  amd64   default 20160311_22:42
debian  jessie  armel   default 20160111_22:42
debian  jessie  armhf   default 20160111_22:42
debian  jessie  i386    default 20160311_22:42
debian  sid     amd64   default 20160311_22:42
debian  sid     armel   default 20160111_22:42
debian  sid     armhf   default 20160111_22:42
debian  sid     i386    default 20160311_22:42
debian  wheezy  amd64   default 20160311_22:42
debian  wheezy  armel   default 20160111_22:42
debian  wheezy  armhf   default 20160111_22:42
debian  wheezy  i386    default 20160311_22:42
fedora  21      amd64   default 20160311_01:27
fedora  21      armhf   default 20160112_01:27
fedora  21      i386    default 20160311_01:27
fedora  22      amd64   default 20160311_01:27
fedora  22      armhf   default 20160112_01:27
fedora  22      i386    default 20160311_01:27
gentoo  current amd64   default 20160311_14:12
gentoo  current armhf   default 20160111_14:12
gentoo  current i386    default 20160311_14:12
oracle  6.5     amd64   default 20160311_11:40
oracle  6.5     i386    default 20160311_11:40
plamo   5.x     amd64   default 20160311_21:36
plamo   5.x     i386    default 20160311_21:36
ubuntu  precise amd64   default 20160311_03:49
ubuntu  precise armel   default 20160112_03:49
ubuntu  precise armhf   default 20160311_03:49
ubuntu  precise i386    default 20160311_03:49
ubuntu  trusty  amd64   default 20160311_03:49
ubuntu  trusty  armhf   default 20160311_03:49
ubuntu  trusty  i386    default 20160311_03:49
ubuntu  wily    amd64   default 20160311_03:49
ubuntu  wily    armhf   default 20160311_03:49
ubuntu  wily    i386    default 20160311_03:49
ubuntu  xenial  amd64   default 20160311_03:49
ubuntu  xenial  armhf   default 20160311_03:49
ubuntu  xenial  i386    default 20160311_03:49
---

Distribution: centos
Release: 7
Architecture: amd64

Downloading the image index
Downloading the rootfs
Downloading the metadata
The image cache is now ready
Unpacking the rootfs

---
 You just created a centos container (release=7, arch=amd64, variant=default)

To enable sshd, run: rc-update add sshd

For security reason, container images ship without user accounts
and without a root password.

Use lxc-attach or chroot directly into the rootfs to set a root password
or create user accounts.

      Set your root password

      [root@localhost ~]# chroot /var/lib/lxc/<name>/rootfs passwd
Changing password for user root.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.

      Start the container

      lxc-start -d -n <name>

      Attach to the container concole

      lxc-attach -n <name>

      Disconnect by tying exit.

      echo "lxc.kmsg = 0" >> /usr/share/lxc/config/fedora.common.conf

      1 Reply Last reply Reply Quote -1
      • stacksofplatesS
        stacksofplates
        last edited by stacksofplates

        last command should be lxc-attach -n

        1 Reply Last reply Reply Quote 1
        • A
          Alex Sage
          last edited by Alex Sage

          Running a CentOS 7 LXC container using lxc-create CentOS 7 results in a 100% CPU loop for the systemd-journald process.

          To fix this issue you must add lxc.kmsg = 0 to the container configuration. This can be done easily for all the CentOS 7 templates in one shot:

          echo "lxc.kmsg = 0" >> /usr/share/lxc/config/fedora.common.conf

          Here is the fix: http://vfamilyserver.org/blog/2015/03/fedora-21-lxc-systemd-journald-at-100/

          1 Reply Last reply Reply Quote 0
          • scottalanmillerS
            scottalanmiller
            last edited by

            Pretty minor it seems, just a config line was left out of the container creation script.

            A 1 Reply Last reply Reply Quote 0
            • A
              Alex Sage @scottalanmiller
              last edited by

              @scottalanmiller it seems like LXC is supported better on Ubuntu then CentOS 7. Do you think that's true?

              scottalanmillerS 1 Reply Last reply Reply Quote 0
              • scottalanmillerS
                scottalanmiller @Alex Sage
                last edited by

                @aaronstuder said:

                @scottalanmiller it seems like LXC is supported better on Ubuntu then CentOS 7. Do you think that's true?

                Very much so. Containers is a massive focus for Ubuntu and LXC is where they put all of their effort. They have gone to great lengths to be the container distro.

                A 1 Reply Last reply Reply Quote 0
                • A
                  Alex Sage @scottalanmiller
                  last edited by

                  @scottalanmiller so maybe I should move to Ubuntu for the host.

                  scottalanmillerS 1 Reply Last reply Reply Quote 0
                  • scottalanmillerS
                    scottalanmiller @Alex Sage
                    last edited by

                    @aaronstuder said:

                    @scottalanmiller so maybe I should move to Ubuntu for the host.

                    That might be an overration to the case. If you plan to containerize CentOS on top of it, I'd be pretty hesitant to move to Ubuntu underneath.

                    A 1 Reply Last reply Reply Quote 1
                    • A
                      Alex Sage @scottalanmiller
                      last edited by

                      @scottalanmiller I'll stick to CentOS 7 🙂

                      1 Reply Last reply Reply Quote 0
                      • A
                        Alex Sage
                        last edited by

                        Problem solved 🙂

                        1 Reply Last reply Reply Quote 1
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