systemd在docker容器中使用
以centos 7.2容器中运行httpd服务为例子，默认下直接运行# systemctl start httpd.service
Failed to get D-Bus connection: Operation not permitted 在网上找到的解决方法：
[*] 创建Dockerfile创建一个基础镜像
FROMcentos:7.2
MAINTAINER hpsfpcca@163.com
ENV container docker
RUN yum -y update && \
yum clean all && \
yum -y install systemd && \
yum clean all && \
(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 -t centos_test_systemctl . 2.在上面镜像的基础上再构建apache镜像
FROM centos_test_systemctl
MAINTAINER hpsfpcca@163.com
RUN yum -y install httpd && \
yum clean all && \
systemctl enable httpd.service
EXPOSE 80
CMD ["/usr/sbin/init"]# docker build -t centos_test_httpd .
3.然后就启动容器
# docker run --privileged -it -v /sys/fs/cgroup:/sys/fs/cgroup:ro -p 80:80 centos_test_httpd
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