docker和centos你需要知道的

https://hub.docker.com/_/centos/

docker pull centos:6

docker pull centos:6.6

yum:

注释掉 /etc/yum.conf 中tsflags=modocs，重装包

systemd for centos 7系
#systemd 包含在centos:7和centos:latest中，默认没有激活
Dockerfile for sytemd base image

FROM centos:7
MAINTAINER "you" <your@email.here>
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"]

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

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

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

run a systemd enabled 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