Official Repository

Last pushed: 17 days ago
Short Description
The official build of CentOS.
Full Description

Supported tags and respective Dockerfile links

Quick reference

CentOS

CentOS Linux is a community-supported distribution derived from sources freely provided to the public by Red Hat for Red Hat Enterprise Linux (RHEL). As such, CentOS Linux aims to be functionally compatible with RHEL. The CentOS Project mainly changes packages to remove upstream vendor branding and artwork. CentOS Linux is no-cost and free to redistribute. Each CentOS Linux version is maintained for up to 10 years (by means of security updates -- the duration of the support interval by Red Hat has varied over time with respect to Sources released). A new CentOS Linux version is released approximately every 2 years and each CentOS Linux version is periodically updated (roughly every 6 months) to support newer hardware. This results in a secure, low-maintenance, reliable, predictable, and reproducible Linux environment.

wiki.centos.org

CentOS image documentation

The centos:latest tag is always the most recent version currently available.

Rolling builds

The CentOS Project offers regularly updated images for all active releases. These images will be updated monthly or as needed for emergency fixes. These rolling updates are tagged with the major version number only. For example: docker pull centos:6 or docker pull centos:7

Minor tags

Additionally, images with minor version tags that correspond to install media are also offered. These images DO NOT recieve updates as they are intended to match installation iso contents. If you choose to use these images it is highly recommended that you include RUN yum -y update && yum clean all in your Dockerfile, or otherwise address any potential security concerns. To use these images, please specify the minor version tag:

For example: docker pull centos:5.11 or docker pull centos:6.6

Overlayfs and yum

Recent Docker versions support the overlayfs backend, which is enabled by default on most distros supporting it from Docker 1.13 onwards. On Centos 6 and 7, that backend requires yum-plugin-ovl to be installed and enabled; while it is installed by default in recent centos images, make it sure you retain the plugins=1 option in /etc/yum.conf if you update that file; otherwise, you may encounter errors related to rpmdb checksum failure - see Docker ticket 10180 for more details.

Package documentation

By default, the CentOS containers are built using yum's nodocs option, which helps reduce the size of the image. If you install a package and discover files missing, please comment out the line tsflags=nodocs in /etc/yum.conf and reinstall your package.

Systemd integration

Systemd is now included in both the centos:7 and centos:latest base containers, but it is not active by default. In order to use systemd, you will need to include text similar to the example Dockerfile below:

Dockerfile for systemd base image

FROM centos:7
ENV container docker
RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i == \
systemd-tmpfiles-setup.service ] || rm -f $i; done); \
rm -f /lib/systemd/system/multi-user.target.wants/*;\
rm -f /etc/systemd/system/*.wants/*;\
rm -f /lib/systemd/system/local-fs.target.wants/*; \
rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
rm -f /lib/systemd/system/basic.target.wants/*;\
rm -f /lib/systemd/system/anaconda.target.wants/*;
VOLUME [ "/sys/fs/cgroup" ]
CMD ["/usr/sbin/init"]

This Dockerfile deletes a number of unit files which might cause issues. From here, you are ready to build your base image.

$ docker build --rm -t local/c7-systemd .

Example systemd enabled app container

In order to use the systemd enabled base container created above, you will need to create your Dockerfile similar to the one below.

FROM local/c7-systemd
RUN yum -y install httpd; yum clean all; systemctl enable httpd.service
EXPOSE 80
CMD ["/usr/sbin/init"]

Build this image:

$ docker build --rm -t local/c7-systemd-httpd

Running a systemd enabled app container

In order to run a container with systemd, you will need to mount the cgroups volumes from the host. Below is an example command that will run the systemd enabled httpd container created earlier.

$ docker run -ti -v /sys/fs/cgroup:/sys/fs/cgroup:ro -p 80:80 local/c7-systemd-httpd

This container is running with systemd in a limited context, with the cgroups filesystem mounted. There have been reports that if you're using an Ubuntu host, you will need to add -v /tmp/$(mktemp -d):/run in addition to the cgroups mount.

Docker Pull Command

Comments (149)
renizgo
11 days ago

It's work in compose version 2, in Rancher:

version: '2'
services:
systemd-httpd:
image: renizgo/c7-systemd-httpd
volumes:

- /sys/fs/cgroup:/sys/fs/cgroup:ro
privileged: true
ports:
- 80
labels:
  io.rancher.container.pull_image: always
renizgo
11 days ago

It's work use:

docker run --privileged --name centos7 -v /sys/fs/cgroup:/sys/fs/cgroup:ro -p 80:80 -d renizgo/c7-systemd-httpd /usr/sbin/init

Renato-Mac:centos renato$ docker exec -it 3c84 /bin/bash
[root@3c840edb31cd /]# ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 18:30 ? 00:00:00 /usr/sbin/init
root 24 1 0 18:30 ? 00:00:00 /usr/lib/systemd/systemd-journald
root 28 1 0 18:30 ? 00:00:00 /usr/lib/systemd/systemd-udevd
root 56 1 0 18:30 ? 00:00:00 /usr/sbin/httpd -DFOREGROUND
root 57 1 0 18:30 ? 00:00:00 /usr/lib/systemd/systemd-logind
dbus 59 1 0 18:30 ? 00:00:00 /bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
apache 73 56 0 18:30 ? 00:00:00 /usr/sbin/httpd -DFOREGROUND
apache 74 56 0 18:30 ? 00:00:00 /usr/sbin/httpd -DFOREGROUND
apache 75 56 0 18:30 ? 00:00:00 /usr/sbin/httpd -DFOREGROUND
apache 76 56 0 18:30 ? 00:00:00 /usr/sbin/httpd -DFOREGROUND
apache 77 56 0 18:30 ? 00:00:00 /usr/sbin/httpd -DFOREGROUND
root 78 0 0 18:30 ? 00:00:00 /bin/bash
root 92 78 0 18:30 ? 00:00:00 ps -ef

mcastillo
a month ago

it works, Use this

docker run --privileged --name centos7 -v /sys/fs/cgroup:/sys/fs/cgroup:ro -p 80:80 -d centos /usr/sbin/init

herobigdata
4 months ago

Hello, how to solve : Failed to get D-Bus connection: Operation not permitted ? thanks !

jamshid
4 months ago

If you're having problems with yum / checksum errors, make sure your docker server is using overlay2 and you install yum-plugin-ovl (https://github.com/CentOS/sig-cloud-instance-images/issues/74).

If you are having problems running systemd, see:
https://github.com/docker/docker/issues/28614#issuecomment-261724902

docmiller
5 months ago

For those experiencing issues with systemctl I recommend running "yum reinstall systemd" or dnf if you are using that.

canit0
5 months ago

@jnmik like what does that even mean? If you download an install DVD, are you going to ask that they provide a vulnerability free image, or simply patch it yourself once you install the OS?

jnmik
5 months ago

Any plans to make the latest image vulnerability free ?

ghadsfjkghf
6 months ago

aa

cristo
8 months ago

I have a problem with centos:7.2.1511

Rpmdb checksum is invalid: dCDPT(pkg checksums): perl-HTTP-Tiny.noarch 0:0.033-3.el7 - u

Removing intermediate container f0a55f9f7775
The command '/bin/sh -c yum install -y git' returned a non-zero code: 1