CentOS7NTPserver+keepalived
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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
1 windows客户端向NTP每10分钟同步一次时间
gpedit.msc打开组策略
1.1 启动windows NTP客户端
1.2 配置windows NTP客户端
1.3 Internet时间设置里指定时间服务器
点击立即更新
2 linux客户端向NTP每10分钟同步一次时间
2.1 安装NTP
yum -y install ntp
2.2 设置时间同步
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
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