CentOS7 NTP server + keepalived

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发布时间：2019-06-18

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NTP安装

yum -y install ntp

systemctl enable ntpd

首先同步一次时间

ntpdate time.windows.com

ntp配置(Host1 Host2)

/etc/ntp.conf

server time.windows.com preferserver 0.asia.pool.ntp.orgserver 1.asia.pool.ntp.orgserver 2.asia.pool.ntp.org#记录上次的NTP server与上层NTP server连接接所花费的时间driftfile /var/lib/ntp/drift#设置默认策略为允许任何主机进行时间同步restrict 0.0.0.0 mask 0.0.0.0 nomodify#设置ntp日志的pathstatsdir /var/log/ntp/#设置ntp日志文件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安装

（host1、host2）

yum -y install Keepalived

NTP健康检测脚本：

cat /script/check_ntp.sh

#!/bin/bash# status="ntp_failed" check failed, status="ntp_success" check ntp successstatus="ntp_failed"if [ $(ps -C ntpd --no-header |wc -l) != 0 ]; then    status="ntp_success"else    /bin/systemctl restart ntpd    if [ $(ps -C ntpd --no-header |wc -l) != 0 ]; then        status="ntp_success"    fifi

chmod +x /script/check_ntp.sh

向外发送邮件告警python脚本：

cat /script/keepalived_notify.py

#!/usr/bin/env python# -*- coding:utf-8 -*-# use: /bin/python /script/keepalived_notify.py 角色{master/backup} 本机IP 虚拟机IPimport smtplibfrom email.mime.text import MIMETextfrom email.header import Headerimport sys, time, subprocess# 第三方 SMTP 服务mail_host="smtp.exmail.qq.com"  #设置服务器mail_user="xx@qq.com"    #用户名mail_pass="mail_password"   #口令sender = 'xx@qq.com'receivers = ['xx1@qq.com', 'xx@163.com']  # 接收告警邮件地址，可设置为你的QQ邮箱或者其他邮箱p = subprocess.Popen('hostname', shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)hostname = p.stdout.readline().split('\n')[0]message_to = ''for i in receivers:    message_to += i + ';'def print_help():    note = '''python script.py role ip vip    '''    print(note)    exit(1)time_stamp = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))if len(sys.argv) != 4:    print_help()elif sys.argv[1] == 'master':    message_content = '%s server: %s(%s) change to Master, vIP: %s' %(time_stamp, sys.argv[2], hostname, sys.argv[3])    subject = '%s change to Master -- keepalived notify' %(sys.argv[2])elif sys.argv[1] == 'backup':    message_content = '%s server: %s(%s) change to Backup, vIP: %s' %(time_stamp, sys.argv[2], hostname, sys.argv[3])    subject = '%s change to Backup -- keepalived notify' %(sys.argv[2])else:    print_help()message = MIMEText(message_content, 'plain', 'utf-8')message['From'] = Header(sender, 'utf-8')message['To'] =  Header(message_to, 'utf-8')message['Subject'] = Header(subject, 'utf-8')try:    smtpObj = smtplib.SMTP()    smtpObj.connect(mail_host, 25)    # 25 为 SMTP 端口号    smtpObj.login(mail_user,mail_pass)    smtpObj.sendmail(sender, receivers, message.as_string())    print("邮件发送成功")except smtplib.SMTPException as e:    print("Error: 无法发送邮件")    print(e)

host1配置

/etc/keepalived/keepalived.conf

global_defs {        notification_email {                xx@xx.com        }        notification_email_from keepalived@xx.com        smtp_server 127.0.0.1        smtp_connect_timeout 30        router_id LVS_DEVEL}vrrp_script chk_ntp {        script "/script/check_ntp.sh |grep 'ntp_success' "        interval 4        weight -60    ## 当检测失败时，优先级减60，该值的绝对要大于主备优先级差的绝对值}vrrp_instance VI_1 {        state BACKUP        ############ MASTER/BACKUP        interface ens160        virtual_router_id 51        mcast_src_ip 172.16.0.2        priority 150                  ########### MASTER权值要比BACKUP高        advert_int 1        authentication {                auth_type PASS                auth_pass GSksLAyTX9ylwG86U2Ez        }        track_script {                 chk_http_port ### 执行NTP健康检测        }                virtual_ipaddress {                172.16.0.10        }        notify_master "/bin/python /script/keepalived_notify.py master 172.16.0.2 172.16.0.10"    ## 当切换为master时执行脚本        notify_backup "/bin/python /script/keepalived_notify.py backup 172.16.0.2 172.16.0.10"    ## 当切换为backup时执行脚本}

Host2配置

global_defs {        notification_email {                xx@xx.com        }        notification_email_from keepalived@xx.com        smtp_server 127.0.0.1        smtp_connect_timeout 30        router_id LVS_DEVEL}vrrp_script chk_ntp {        script "/script/check_ntp.sh |grep 'ntp_success' "        interval 4        weight -60    ## 当检测失败时，优先级减60，该值的绝对要大于主备优先级差的绝对值}vrrp_instance VI_1 {        state MASTER        ############ MASTER/BACKUP        interface ens160        virtual_router_id 51        mcast_src_ip 172.16.0.3        priority 100                  ########### MASTER权值要比BACKUP高        advert_int 1        authentication {                auth_type PASS                auth_pass GSksLAyTX9ylwG86U2Ez        }        track_script {                 chk_http_port ### 执行NTP健康检测        }        virtual_ipaddress {                172.16.0.10        }                notify_master "/bin/python /script/keepalived_notify.py master 172.16.0.3 172.16.0.10"    ## 当切换为master时执行脚本        notify_backup "/bin/python /script/keepalived_notify.py backup 172.16.0.3 172.16.0.10"    ## 当切换为backup时执行脚本}

keepalived CentOS 7 启动脚本

#####

[Unit]

Description=Keepalived, LVS and VRRP High Availability Monitor

After=syslog.target network.target

[Service]

Type=forking

KillMode=process

EnvironmentFile=-/etc/sysconfig/keepalived

ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS

ExecReload=/bin/kill -HUP $MAINPID

[Install]