Docker build NTP server

background

When building a ETCD cluster, synchronization errors occur if the host time varies too much, and internal NTP server synchronization time is required if the external network is not available.

building an NTP imageCreate Dockerfile

# usage:# Docker build-T NTP. # Docker run Docker run-D--name Ntp-server-p123:123-v/etc/localtime:/etc/localtime:ro-v/etc/timezone:/etc/Timezone:ro ntpfrom Nginxrunsed-I. s/archive.ubuntu.com/mirrors.aliyun.com/g/etc/apt/sources.list&&sed-I. s/security.ubuntu.com/mirrors.aliyun.com/g/etc/apt/sources.list&& apt-Get Updaterun apt-getInstallNTP-Yadd./entrypoint.SH/bin/entrypoint.SHADD./ntp.conf/etc/ntp.conf# entrypoint ["/ETC/INIT.D/NTP","Start"]cmd ["SH","/bin/entrypoint.sh"]

Create a entrypoint.sh file

/etc/init.d/'daemon off; '

Create npt.conf

Restrict default nomodify notrap noqueryrestrict127.0.0.1Restrict192.168.0.0Mask255.255.255.0nomodifyrestrict10.10.10.0Mask255.255.255.0Nomodify#server0. Pool.ntp.org#server1. Pool.ntp.org#server2. Pool.ntp.orgserver127.127.1.0# local Clockfudge127.127.1.0StratumTenDriftfile/var/lib/ntp/Driftbroadcastdelay0.008

Build image

Docker build-t NTP.

start the NTP server

Docker run-d--name ntp-server-p 123:123-v/etc/localtime:/etc/localtime:ro-v/etc/timezone:/etc/timezone:ro NTP

View service Status

Docker exec-it ntp-server Service NTP status

Client Configuration

The current running container does not need to configure the client

Client and server cannot run on the same machine

The current server is using the host's time as the standard Time

Installing Ntpdate

sudo Install ntpdate

Synchronize host Time

sudo 192.168. 0.20

The IP here is the host that the NTP container is running on

Configure Scheduled Task update time

By the following command, you can open the user's timing files, files stored in the/var/spool/cron/crontabs folder, and the name of the file named

You can use the following command to list the details of a cron service for a user

Crontab-l

Edit the timed task with the following command

Crontab-e

Add at end of file

192.168. 0.20

Some common cycles

Executes every five minutes */5 * * * * hourly  execution      0 * * * * daily execution         00 * * * Weekly execution c10/>000 monthly execution         001 * *  Annual execution        0011 *

Restart Timed Task Service

sudo service cron restart

View Logs

Ten -f-u cron

Docker build NTP server