集群 day-44 （集群介绍, 18.2 keepalived介绍, 18.3/18.4/18.5 用keepalived配置高可用集群 ）

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18.1 集群介绍

18.2 keepalived介绍

18.3 用keepalived配置高可用集群（上）

清空配置文件，粘贴模板

global_defs {notification_email {aming@aminglinux.com}notification_email_from root@aminglinux.comsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL
}vrrp_script chk_nginx {script "/usr/local/sbin/check_ng.sh"interval 3
}vrrp_instance VI_1 {state MASTERinterface ens33virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass aminglinux>com}virtual_ipaddress {192.168.188.100}track_script {chk_nginx}}

#!/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 startn2=`ps -C nginx --no-heading|wc -l`if [ $n2 -eq "0"  ]; thenecho "$d nginx down,keepalived will stop" >> /var/log/check_ng.logsystemctl stop keepalivedfi
fi

18.4 用keepalived配置高可用集群（中）

主和备 都 要把防火墙关闭

从的设备

global_defs {notification_email {aming@aminglinux.com}notification_email_from root@aminglinux.comsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL
}vrrp_script chk_nginx {script "/usr/local/sbin/check_ng.sh"interval 3
}vrrp_instance VI_1 {state BACKUPinterface ens33virtual_router_id 51priority 90advert_int 1authentication {auth_type PASSauth_pass aminglinux>com}virtual_ipaddress {192.168.188.100}track_script {chk_nginx}}

#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" ]; thensystemctl start nginxn2=`ps -C nginx --no-heading|wc -l`if [ $n2 -eq "0"  ]; thenecho "$d nginx down,keepalived will stop" >> /var/log/check_ng.logsystemctl stop keepalivedfi
fi

默认页配置文件


默认页配置文件

18.5 用keepalived配置高可用集群（下）

模拟测试

如果有多台backup 服务器角色时，把权重设置不同级别
vi /etc/keepalived/keepalived.conf

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