ntp설치
[root@localhost]# yum -y install ntp
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirror.cdnetworks.com
* extras: centos.mirror.cdnetworks.com
* updates: centos.mirror.cdnetworks.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package ntp.x86_64 0:4.2.6p5-10.el6.centos.1 will be installed
--> Processing Dependency: ntpdate = 4.2.6p5-10.el6.centos.1 for package: ntp-4.2.6p5-10.el6.centos.1.x86_64
--> Running transaction check
---> Package ntpdate.x86_64 0:4.2.6p5-10.el6.centos.1 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
===============================================================================
Package Arch Version Repository Size
===============================================================================
Installing:
ntp x86_64 4.2.6p5-10.el6.centos.1 updates 598 k
Installing for dependencies:
ntpdate x86_64 4.2.6p5-10.el6.centos.1 updates 78 k
Transaction Summary
===============================================================================
Install 2 Package(s)
Total download size: 677 k
Installed size: 1.8 M
Downloading Packages:
(1/2): ntp-4.2.6p5-10.el6.centos.1.x86_64.rpm | 598 kB 00:00
(2/2): ntpdate-4.2.6p5-10.el6.centos.1.x86_64.rpm | 78 kB 00:00
----------------------------------------------------------------------------------------
Total 129 kB/s | 677 kB 00:05
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : ntpdate-4.2.6p5-10.el6.centos.1.x86_64 1/2
Installing : ntp-4.2.6p5-10.el6.centos.1.x86_64 2/2
Verifying : ntpdate-4.2.6p5-10.el6.centos.1.x86_64 1/2
Verifying : ntp-4.2.6p5-10.el6.centos.1.x86_64 2/2
Installed:
ntp.x86_64 0:4.2.6p5-10.el6.centos.1
Dependency Installed:
ntpdate.x86_64 0:4.2.6p5-10.el6.centos.1
Complete!
[root@localhost]#
시간동기화할 서버 설정.
동기화할 서버 주소 : http://www.pool.ntp.org/ 에서 확인 가능.
[root@localhost]# vi /etc/ntp.conf
# For more information about this file, see the man pages
# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).
driftfile /var/lib/ntp/drift
# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
restrict -6 ::1
# Hosts on local network are less restricted.
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
server 0.asia.pool.ntp.org
server 1.asia.pool.ntp.org
server 2.asia.pool.ntp.org
server 3.asia.pool.ntp.org
#broadcast 192.168.1.255 autokey # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 autokey # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 autokey # manycast client
# Enable public key cryptography.
#crypto
includefile /etc/ntp/crypto/pw
# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys
# Specify the key identifiers which are trusted.
#trustedkey 4 8 42
# Specify the key identifier to use with the ntpdc utility.
#requestkey 8
# Specify the key identifier to use with the ntpq utility.
#controlkey 8
# Enable writing of statistics records.
#statistics clockstats cryptostats loopstats peerstats
ntp 서비스를 사용할 수 있도록 방화벽을 설정
[root@localhost]# vi /etc/sysconfig/iptables
ntp 서비스 시작
[root@localhost]# service ntpd start
시스템 재부팅시에도 서비스가 시작할수 있도록 설정.
[root@localhost]# chkconfig --list ## 재부팅시 서비스 시작 목록 확인.
[root@localhost]# chkconfig --level 2345 ntpd on ## 재부팅시 서비스 시작하도록 설정.
ntp 작동 여부 확인 - 시간 동기화 여부 확인
[root@localhost]# ntpq -p
