CentOS7 NTP Server + keepalived

NTP installation

Yum-y Install NTP

Systemctl Enable NTPD

Synchronize one time first

Ntpdate time.windows.com

NTP configuration (Host1 Host2)

/etc/ntp.conf

server time.windows.com prefer
server 0.asia.pool.ntp.org
server 1.asia.pool.ntp.org
server 2.asia.pool.ntp.org


#Record the time it took for the last NTP server to connect to the upper NTP server
driftfile /var/lib/ntp/drift


#Set the default policy to allow any host to synchronize time
restrict 0.0.0.0 mask 0.0.0.0 nomodify


#Set the path of the ntp log
statsdir /var/log/ntp/


#Set ntp log file
logfile /var/log/ntp/ntp.log

mkdir/var/log/ntp/; Touch/var/log/ntp/ntp.log; Chown Ntp:ntp/var/log/ntp/ntp.log

Systemctl Start NTPD

Keepalived Installation

Yum-y Install keepalived

HOST1 Configuration

/etc/keepalived/keepalived.conf

global_defs {
         notification_email {
                 [email protected]
         }

         notification_email_from [email protected]
         smtp_server 127.0.0.1
         smtp_connect_timeout 30
         router_id LVS_DEVEL
}




vrrp_instance VI_1 {
         state MASTER ############ MASTER/BACKUP
         interface eno16777984
         virtual_router_id 51
         mcast_src_ip 172.16.0.2
         priority 150 ########### MASTER weight is higher than BACKUP
         advert_int 1

         authentication {
                 auth_type PASS
                 auth_pass GSksLAyTX9ylwG86U2Ez
         }

         virtual_ipaddress {
                 172.16.0.10
         }

}

HOST2 Configuration

global_defs {
         notification_email {
                 [email protected]
         }

         notification_email_from [email protected]
         smtp_server 127.0.0.1
         smtp_connect_timeout 30
         router_id LVS_DEVEL
}




vrrp_instance VI_1 {
         state BACKUP ############ MASTER/BACKUP
         interface eno16777984
         virtual_router_id 51
         mcast_src_ip 172.16.0.3
         priority 150 ########### MASTER weight is higher than BACKUP
         advert_int 1

         authentication {
                 auth_type PASS
                 auth_pass GSksLAyTX9ylwG86U2Ez
         }

         virtual_ipaddress {
                 172.16.0.10
         }

} 

Systemctl Enable keepalived

Systemctl Start keepalived

1 windowsClient toNtpevery10minute synchronization Time

Gpedit.msc Open Group Policy

1.1StartWindows NTPClient

1.2ConfigurationWindows NTPClient

1.3 Internetspecify time server in time settings

Click Update Now

2 LinuxClient toNtpevery10minute synchronization Time2.1installationNtp

Yum-y Install NTP

2.2set up time synchronization

Execute the following command

Echo-e "\n\n## Sync TIME\N*/10 * * * * * root ntpdate 172.16.0.10 && hwclock-w" >>/etc/crontab

CentOS7 NTP Server + keepalived