Cloudera CDH/CDP 및 Hadoop EcoSystem, Semantic IoT등의 개발/운영 기술을 정리합니다. gooper@gooper.com로 문의 주세요.
1. rdate를 설치한다.
root@master:/app/hdd# apt-get install rdate
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
rdate
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 16.4 kB of archives.
After this operation, 65.5 kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
rdate
Authentication warning overridden.
Get:1 http://ports.ubuntu.com/ubuntu-ports/ quantal/main rdate armhf 1:1.2-5 [16.4 kB]
Fetched 16.4 kB in 1s (13.9 kB/s)
Selecting previously unselected package rdate.
(Reading database ... 59871 files and directories currently installed.)
Unpacking rdate (from .../rdate_1%3a1.2-5_armhf.deb) ...
Processing triggers for man-db ...
Setting up rdate (1:1.2-5) ...
localepurge: Disk space freed in /usr/share/locale: 45316 KiB
localepurge: Disk space freed in /usr/share/man: 4252 KiB
localepurge: Disk space freed in /usr/share/gnome/help: 564 KiB
localepurge: Disk space freed in /usr/share/omf: 8 KiB
Total disk space freed by localepurge: 50140 KiB
2. 설정할 사이트의 주소를 이용하여 날자를 현재 시간과 동기화 한다.
root@master:/root# rdate -s time.nist.gov
3. CST를 KST로 적용하도록 변경
mv /etc/localtime /etc/localtime_old
cp /usr/share/zoneinfo/Asia/Seoul /etc/localtime
4. 시간을 hw에 기록
root@master:/root# hwclock -w
#확인
root@master:~# date
Sun Aug 24 22:26:58 CST 2014
# 주기적으로 실행하려면 root로 로그인하여
crontab -e하여 아래 줄을 입력한다.
00 01 * * * /usr/bin/rdate -s time.nist.gov
00 01 * * * /sbin/hwclock -w
---------------time server list--------------
time.nist.gov
time.bora.net
* 참고 :rdate용 시간 제공 서버가 많이 없어짐 그래서 ntpdate를 이용하는 방법을 사용할것
-------------------------------------ntpdate사용-----------------
ntpdate time.nuri.net
ntpdate time.bora.net