时间同步

1. 安装ntp服务

    yum -y install ntp
   

2. 设置开机启动

    service ntpd start
    chkconfig ntpd on
   

3. 配置时间服务器
   3.1 主节点: sudo vi /etc/ntp.conf

    driftfile /var/lib/ntp/drift
    restrict default kod nomodify notrap nopeer noquery
    restrict -6 default kod nomodify notrap nopeer noquery
    restrict 127.0.0.1
    restrict -6 ::1
    restrict 192.168.100.0  mask  255.255.255.0 nomodify  notrap  # 给192.168.100.0网段，子网掩码为255.255.255.0的局域网机的机器有同>步时间的权限
    server ntp1.aliyun.com prefer
    server  127.127.1.0  #  localclock
    includefile /etc/ntp/crypto/pw
    keys /etc/ntp/keys
   

3.2 需要同步节点：sudo vi /etc/ntp.conf

	driftfile /var/lib/ntp/drift
	restrict default kod nomodify notrap nopeer noquery
	restrict -6 default kod nomodify notrap nopeer noquery
	restrict 127.0.0.1
	restrict -6 ::1
	server 192.168.100.110  # 主节点IP
	includefile /etc/ntp/crypto/pw
	keys /etc/ntp/keys

4. 重启ntp服务，5-10分钟之后同步成功

    service ntpd restart