keepalived介绍、用keepalived配置高可用集群
2018-09-05 22:16
661 查看
一:keepalived介绍
在这里我们使用keepalived来实现高可用集群,因为heartbeat在centos6上有一些问题,影响实验效果keepalived通过VRRP(Virtual Router Redundancy Protocl)来实现高可用。
在这个协议里会将多台功能相同的路由器组成一个小组,这个小组里会有1个master角色和N(N>=1)个backup角色。
master会通过组播的形式向各个backup发送VRRP协议的数据包,当backup收不到master发来的VRRP数据包时,就会认为master宕机了。此时就需要根据各个backup的优先级来决定谁成为新的mater。
Keepalived要有三个模块,分别是core、check和vrrp。其中core模块为keepalived的核心,负责主进程的启动、维护以及全局配置文件的加载和解析,check模块负责健康检查,vrrp模块是来实现VRRP协议的。
二:用keepalived配置高可用集群
准备两台机器130和132,130作为master,132作为backup两台机器都执行yum install -y keepalived
两台机器都安装nginx,其中130上已经编译安装过nginx,132上需要yum安装nginx: yum install -y nginx
设定vip为100
编辑130上keepalived配置文件,内容从
global_defs { notification_email { aming@aminglinux.com } notification_email_from root@aminglinux.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "/usr/local/sbin/check_ng.sh" interval 3 } vrrp_instance VI_1 { state MASTER interface ens33 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass aminglinux>com } virtual_ipaddress { 192.168.188.100 } track_script { chk_nginx } }
130编辑监控脚本,
#!/bin/bash #时间变量,用于记录日志 d=`date --date today +%Y%m%d_%H:%M:%S` #计算nginx进程数量 n=`ps -C nginx --no-heading|wc -l` #如果进程为0,则启动nginx,并且再次检测nginx进程数量, #如果还为0,说明nginx无法启动,此时需要关闭keepalived if [ $n -eq "0" ]; then /etc/init.d/nginx start n2=`ps -C nginx --no-heading|wc -l` if [ $n2 -eq "0" ]; then echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log systemctl stop keepalived fi fi
给脚本755权限
systemctl start keepalived 130启动服务
132上编辑配置文件
global_defs { notification_email { aming@aminglinux.com } notification_email_from root@aminglinux.com smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "/usr/local/sbin/check_ng.sh" interval 3 } vrrp_instance VI_1 { state BACKUP interface ens33 virtual_router_id 51 priority 90 advert_int 1 authentication { auth_type PASS auth_pass aminglinux>com } virtual_ipaddress { 192.168.188.100 } track_script { chk_nginx } }
132上编辑监控脚本
#时间变量,用于记录日志 d=`date --date today +%Y%m%d_%H:%M:%S` #计算nginx进程数量 n=`ps -C nginx --no-heading|wc -l` #如果进程为0,则启动nginx,并且再次检测nginx进程数量, #如果还为0,说明nginx无法启动,此时需要关闭keepalived if [ $n -eq "0" ]; then systemctl start nginx n2=`ps -C nginx --no-heading|wc -l` if [ $n2 -eq "0" ]; then echo "$d nginx down,keepalived will stop" >> /var/log/check_ng.log systemctl stop keepalived fi fi
给脚本755权限
132上也启动服务 systemctl start keepalived
先确定好两台机器上nginx差异,比如可以通过curl -I 来查看nginx版本
测试1:关闭master上的nginx服务
测试2:在master上增加iptabls规则
iptables -I OUTPUT -p vrrp -j DROP
测试3:关闭master上的keepalived服务
测试4:启动master上的keepalived服务
相关文章推荐
- 18.1 集群介绍;18.2 keepalived介绍;18.3,18.4,18.5 用keepalived配置高可用集群(上,中,下);
- 十五周一次课 2018.01.26 集群介绍、keepalived介绍、用keepalived配置高可用集群
- linux集群架构介绍,Keepalived介绍,用keepalived配置高可用集群
- 集群介绍、keepalived介绍、用keepalived配置高可用集群
- linux集群-keepalived介绍-用keepalived配置高可用集群
- 集群介绍+用keepalived配置高可用集群(总结)
- linux学习第五十六篇:集群介绍,keepalived介绍,用keepalived配置高可用集群
- 集群介绍 、keepalived介绍 、 用keepalived配置高可用集群
- 集群介绍,keepalived介绍,用keepalived配置高可用集群
- 集群介绍 、keepalived介绍 、 用keepalived配置高可用集群
- 搭建高可用集群 --- keepalived的介绍及简单配置
- 集群介绍 、keepalived介绍 、 用keepalived配置高可用集群
- 集群介绍,keepalived介绍,用keepalived配置高可用集群
- 集群介绍、keepalived介绍、keepalived配置高可用集群
- 集群介绍、keepalived介绍、用keepalived配置高可用集群
- 18.1 集群介绍 18.2 keepalived介绍 18.3/18.4/18.5 用keepalived配置高可用集群
- 集群介绍 keepalived介绍 用keepalived配置高可用集群
- 集群介绍、keepalived介绍、用keepalived配置高可用集群
- Linux集群架构(集群介绍、keepalived介绍、用keepalived配置高可用集群)
- 集群介绍、keepalived介绍、用Keepalived配置高可用集群