CentOS7 minimal ntp chrony

• ntp服务器(192.168.0.242 node2)(暂时没测试出来，不使用)

1. 下载
   yum install ntp -y
2. 配置
   vi /etc/ntp.conf

...
#restrict default nomodify notrap nopeer noquery
restrict default nomodify  #允许其他任意ip主机同步
...
server 127.0.0.1     # 使用本地时间
fudge  127.0.0.1 stratum 10
...
#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
...

image.png

3. 启动服务
   systemctl start ntpd
systemctl enable ntpd
4. 查看
   ntpq -p
   
   image.png

• ntp客户端(192.168.0.242 nod3)(暂时没测试出来，不使用)

1. 下载
   yum install ntp -y
2. 配置
   vi /etc/ntp.conf

...
#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 node2 iburst
...

image.png

3. 启动服务
   systemctl start ntpd
systemctl enable ntpd
4. 查看
   ntpq -p
   
   image.png
5. 验证

引用：centos7局域网同步时间ntp

• chrony服务器

1. 下载：yum install chrony
2. 配置：vi /etc/chrony.conf

#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 ntp1.aliyun.com iburst #如果是局域网的话就不需要这个
allow 192.168.0.0/24
local stratum 10
bindcmdaddress 127.0.0.1
bindcmdaddress ::1

image.png

3. 启动
   systemctl enable chronyd
systemctl start chronyd
4. 验证
   chronyc sources -v
   
   image.png

• chrony客户端

1. 下载：yum install chrony
2. 配置：vi /etc/chrony.conf

#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 node2 iburst

image.png

3. 启动
   systemctl enable chronyd
systemctl start chronyd
4. 验证
   chronyc sources -v
   注：MS字段中S为*才算连接上
   
   image.png
5. 测试
   修改客户端的时间:date -s 14:00:00
   然后重启chronyd：systemctl restart chronyd
   就可以重新对时
   通过systemctl status chronyd，可以查看日志
   
   image.png