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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 prefer server 0.asia.pool.ntp.org server 1.asia.pool.ntp.org server 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path statsdir /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 success status="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" fi fi
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IP import smtplib from email.mime.text import MIMEText from email.header import Header import 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]
WantedBy=multi-user.target
#####
systemctl enable keepalived
systemctl start keepalived
gpedit.msc打开组策略
点击立即更新
yum -y install ntp
执行下面的命令
echo -e "\n\n## sync time\n*/10 * * * * root ntpdate 172.16.0.10 > /dev/null && hwclock-w > /dev/null" >> /etc/crontab