Docker 容器间时间同步

一、实现原理：首先宿主机间实现时间同步，然后容器启动时以只读方式挂载宿主机的/etc/localtime文件实现各宿主机上的Docker容器间的时间同步。
二、操作步骤
1、宿主机修改时区

[root@flume002 ~]# cp -f /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
cp: overwrite ‘/etc/localtime’? y
[root@flume002 ~]# date
Sun Jan  3 11:49:33 CST 2016

2、安装ntpd服务，并设置开机自启动

[root@flume002 ~]# yum install ntp -y
[root@flume002 ~]# systemctl enable ntpd
ln -s '/usr/lib/systemd/system/ntpd.service' '/etc/systemd/system/multi-user.target.wants/ntpd.service'

3、宿主机与ntp.api.bz同步

[root@flume002 ~]# ntpdate   ntp.api.bz
3 Jan 11:52:33 ntpdate[12298]: adjust time server 61.153.197.226 offset 0.034242 sec

4、启动ntpd service

[root@flume002 ~]# systemctl start ntpd.service

5、启动容器

[root@flume002 ~]# docker run -ti -d  --name test registry.tingyun.com/tingyun/common/centos:7 -v /etc/localtime:/etc/localtime:ro /bin/bash
fd8e9ab132d3802b2c8eee3caf79dc547a1e3f025adc3ee5316eda7d967a1b11
[root@flume002 ~]# date
Sun Jan  3 12:07:21 CST 2016
[root@flume002 ~]# docker  exec -ti test /bin/bash
[root@fd8e9ab132d3 /]# date
Sun Jan  3 12:07:34 CST 2016