nginx的高可用---Keepalived
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目录
3、进入解压后的keepalived目录并构建环境然后进行编译安装
5、编辑主机的keepalived.conf核心配置文件如下
9、由于安装keepalived时是自定义的安装位置因此需要拷贝一些文件在系统目录中
4、进入解压后的keepalived目录并构建环境然后进行编译安装
6、编辑从机的keepalived.conf核心配置文件如下
10、由于安装keepalived时是自定义的安装位置因此需要拷贝一些文件在系统目录中
12、只有当主设备宕机后从设备才能启用此时主设备已经宕机检测VIP是否生效
环境
centos作为主设备ubuntu作为从设备
一、centos安装keepalived
Keepalived官方下载链接https://www.keepalived.org/download.html
1、下载keepalived压缩文件
# wget https://www.keepalived.org/software/keepalived-2.2.7.tar.gz2、解压
# tar -zxvf keepalived-2.2.7.tar.gz3、进入解压后的keepalived目录并构建环境然后进行编译安装
# cd keepalived-2.2.7
# ./configure
# make && make install4、进入配置目录并进行编辑配置文件
# cd /root/keepalived/keepalived/etc/keepalived/
# vim keepalived.conf5、编辑主机的keepalived.conf核心配置文件如下
global_defs {
# 自带的邮件提醒服务建议用独立的监控或第三方SMTP也可选择配置邮件发送。
notification_email {
root@localhost
}
notification_email_from root@localhost
smtp_server localhost
smtp_connect_timeout 30
# 高可用集群主机身份标识(集群中主机身份标识名称不能重复建议配置成本机IP)
router_id 192.168.75.132
}
# 定时运行的脚本文件配置
vrrp_script check_nginx_pid_restart {
# 之前编写的nginx重启脚本的所在位置
script "check_nginx_pid.sh"
# 每间隔3秒执行一次
interval 3
# 如果脚本中的条件成立重启一次则权重-20
weight -20
}
# 定义虚拟路由VI_1为虚拟路由的标示符可自定义名称
vrrp_instance VI_1 {
# 当前节点的身份标识用来决定主从MASTER为主机BACKUP为从机
state BACKUP
# 绑定虚拟IP的网络接口根据自己的机器的网卡配置
interface ens33
# 虚拟路由的ID号主从两个节点设置必须一样
virtual_router_id 240
# 填写本机IP
mcast_src_ip 192.168.75.132
# 节点权重优先级主节点要比从节点优先级高
priority 90
# 优先级高的设置nopreempt解决异常恢复后再次抢占造成的脑裂问题
nopreempt
# 组播信息发送间隔两个节点设置必须一样默认1s类似于心跳检测
advert_int 1
authentication {
auth_type PASS
auth_pass root
}
# 将track_script块加入instance配置块
track_script {
# 执行Nginx监控的脚本
check_nginx_pid_restart
}
virtual_ipaddress {
# 虚拟IP(VIP)也可扩展可配置多个。
192.168.75.240
}
}6、创建Nginx的重启脚本
# vim check_nginx_pid.sh7、给脚本赋予执行权限
# chmod +x /root/keepalived/keepalived/etc/keepalived/check_nginx_pid.sh8、编辑脚本
#!/bin/sh
# 通过ps指令查询后台的nginx进程数并将其保存在变量nginx_number中
nginx_number=`ps -C nginx --no-header | wc -l`
# 判断后台是否还有Nginx进程在运行
if [ $nginx_number -eq 0 ];then
# 如果后台查询不到`Nginx`进程存在则执行重启指令
/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
# 重启后等待1s后再次查询后台进程数
sleep 1
# 如果重启后依旧无法查询到nginx进程
if [ `ps -C nginx --no-header | wc -l` -eq 0 ];then
# 将keepalived主机下线将虚拟IP漂移给从机从机上线接管Nginx服务
systemctl stop keepalived.service
fi
fi9、由于安装keepalived时是自定义的安装位置因此需要拷贝一些文件在系统目录中
# mkdir /etc/keepalived/
# cp /root/keepalived/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
# cp /root/keepalived/keepalived/etc/init.d/keepalived /etc/init.d/
# cp /root/keepalived/keepalived/etc/sysconfig/keepalived /etc/sysconfig10、将keepalived加入系统服务并设置开启自启动
# systemctl enable keepalived.service
# systemctl daemon-reload
# systemctl start keepalived.service11、测试VIP是否生效
二、在ubuntu上安装keepalived
1、安装一些依赖包
# apt-get install libssl-dev
# apt-get install openssl
# apt-get install libpopt-dev
# apt-get install libnl-3-dev
# apt-get install libnl-genl-3-dev2、下载keepalived压缩文件
# wget https://www.keepalived.org/software/keepalived-2.2.7.tar.gz3、解压
# tar -zxvf keepalived-2.2.7.tar.gz4、进入解压后的keepalived目录并构建环境然后进行编译安装
# cd keepalived-2.2.7
# ./configure --profix=/usr/local/keepalived
# make && make install5、进入配置目录并进行编辑配置文件
# /usr/local/keepalived/etc/keepalived
# vim keepalived.conf6、编辑从机的keepalived.conf核心配置文件如下
global_defs {
# 自带的邮件提醒服务建议用独立的监控或第三方SMTP也可选择配置邮件发送。
notification_email {
root@localhost
}
notification_email_from root@localhost
smtp_server localhost
smtp_connect_timeout 30
# 高可用集群主机身份标识(集群中主机身份标识名称不能重复建议配置成本机IP)
router_id 192.168.75.132
}
# 定时运行的脚本文件配置
vrrp_script check_nginx_pid_restart {
# 之前编写的nginx重启脚本的所在位置
script "/usr/local/keepalived/etc/keepalived/check_nginx_pid.sh"
# 每间隔3秒执行一次
interval 3
# 如果脚本中的条件成立重启一次则权重-20
weight -20
}
# 定义虚拟路由VI_1为虚拟路由的标示符可自定义名称
vrrp_instance VI_1 {
# 当前节点的身份标识用来决定主从MASTER为主机BACKUP为从机
state BACKUP
# 绑定虚拟IP的网络接口根据自己的机器的网卡配置
interface ens33
# 虚拟路由的ID号主从两个节点设置必须一样
virtual_router_id 240
# 填写本机IP
mcast_src_ip 192.168.75.132
# 节点权重优先级主节点要比从节点优先级高
priority 90
# 优先级高的设置nopreempt解决异常恢复后再次抢占造成的脑裂问题
nopreempt
# 组播信息发送间隔两个节点设置必须一样默认1s类似于心跳检测
advert_int 1
authentication {
auth_type PASS
auth_pass root
}
# 将track_script块加入instance配置块
track_script {
# 执行Nginx监控的脚本
check_nginx_pid_restart
}
virtual_ipaddress {
# 虚拟IP(VIP)也可扩展可配置多个。
192.168.75.240
}
}7、创建Nginx的重启脚本
# /usr/local/keepalived/etc/keepalived
# vim check_nginx_pid.sh8、给脚本赋予执行权限
# chmod +x /usr/local/keepalived/etc/keepalived/check_nginx_pid.sh9、编辑脚本
#!/bin/sh
# 通过ps指令查询后台的nginx进程数并将其保存在变量nginx_number中
nginx_number=`ps -C nginx --no-header | wc -l`
# 判断后台是否还有Nginx进程在运行
if [ $nginx_number -eq 0 ];then
# 如果后台查询不到`Nginx`进程存在则执行重启指令
/usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
# 重启后等待1s后再次查询后台进程数
sleep 1
# 如果重启后依旧无法查询到nginx进程
if [ `ps -C nginx --no-header | wc -l` -eq 0 ];then
# 将keepalived主机下线将虚拟IP漂移给从机从机上线接管Nginx服务
systemctl stop keepalived.service
fi
fi10、由于安装keepalived时是自定义的安装位置因此需要拷贝一些文件在系统目录中
# mkdir /etc/sysconfig
# mkdir /etc/keepalived
# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/init.d/
# cp /usr/local/keepalived/sbin/keepalived /sbin/
# cp /usr/local/keepalived/etc/keepalived/..keepalived.conf /etc/keepalived/
# cp /root/keepalived/keepalived/keepalived.service /lib/systemd/system/12、将keepalived加入系统服务并设置开启自启动
# systemctl enable keepalived
# systemctl start keepalived12、只有当主设备宕机后从设备才能启用此时主设备已经宕机检测VIP是否生效
主设备未宕机时
当主设备宕机后
