需求：使用Haproxy对两台Nginx做负载均衡，并且两台Haproxy之间做keepalived，Nginx代理后端tomcat
Haproxy（keepalived）主：172.16.10.102
Haproxy（keepalived）备：172.16.10.142
keepalived vip：172.16.10.188
Nginx1:172.16.10.162
Nginx2:172.16.10.167
安装Haproxy并设置日志以及Nginx配置这里就不说了
配置Haproxy（两台一样）
# vim /etc/haproxy/haproxy.cfg
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket/var/lib/haproxy/stats
defaults
mode tcp
log global
option tcplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 100m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
listen nginx-http
bind 0.0.0.0:80
mode tcp
balance source
server s1 172.16.10.167:80check
server s2 172.16.10.162:80check
listen nginx-https
bind 0.0.0.0:443
mode tcp
balance source
server s1 172.16.10.167:443check
server s2 172.16.10.162:443check
安装keepalived
# yum install keepalived -y
配置keepalived主
# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
interval 2
weight 2
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script"/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface eno16777736 #用来发VRRP包的网卡
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 5555
}
track_script {
chk_haproxy #监测haproxy进程状态
}
virtual_ipaddress {
172.16.10.188
}
}
配置keepalived备
# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
interval 2
weight 2
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script"/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eno16777736 #用来发VRRP包的网卡
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 5555
}
track_script {
chk_haproxy #监测haproxy进程状态
}
virtual_ipaddress {
172.16.10.188
}
}
Haproxy进程状态检测脚本
# vim /etc/keepalived/check_haproxy.sh
#!/bin/bash
Hostname=Haproxy-102
date=`date +"%Y-%m-%d %H:%M:%S"`
mail=15001098653@163.com
if [ `ps -C haproxy --no-header | wc -l` -eq 0 ];then
systemctl start haproxy
echo "$date $Hostname Haproxy started by keepalived" | mail -s"$Hostname Haproxy started by keepalived" $mail
fi
Keepalived主从切换状态检测脚本
因为keepalived在vip切换时，在haproxy日志中会有输出，所以检测haproxy日志就可以
# vim /usr/local/shell/check_keepalived.sh
#!/bin/bash
#主机名
Hostname=Haproxy-102
#收件人
mail=********@163.com
#记录上一次的行数
Last_num_d=/tmp/keepalived/lastnum
#日志目录
Log_directory=/var/log/haproxy
#目录判断
d_judge(){
[ ! -d $1 ] && mkdir -p $1
}
d_judge $Last_num_d
for logfile in `ls $Log_directory | grep haproxy.log`; do
#先判断当前日志目录是否为空，为空直接退出循环
[ ! -s $Log_directory/$logfile ]&& echo "`date` $logfile is empty" && continue
#判断记录上一次检查的行数的文件是否存在，不存在则给一个初始值
[ ! -f"$Last_num_d/$logfile" ] && echo 1 > $Last_num_d/$logfile
#将上一次值赋给变量
last_count=`cat$Last_num_d/$logfile`
new_last_count=`expr $last_count+ 1`
#将当前的行数值赋给变量
current_count=`grep -Fc"" $Log_directory/$logfile`
#判断当前行数跟上一次行数是否相等，相等则退出当前循环
[ $last_count -eq $current_count] && echo "`date` $logfile no change" && continue
#由于日志文件每天都会截断，因此会出现当前行数小于上一次行数的情况，此种情况出现则将上一次行数置1
[ $last_count -gt $current_count] && last_count=1 && echo $last_count > $Last_num_d/$logfile&& continue
#截取上一次检查到的行数至当前行数的日志并检索出含有" removed "字段的日志，并重定向到相应的ERROR日志文件
sed -n"$new_last_count,$current_count p" $Log_directory/$logfile | grep ‘IP172.16.10.188 removed‘ > $Error_log/$logfile && echo "`date`$logfile error " || echo "`date` $logfile changed but no error"
#判断ERROR日志是否存在且不为空，不为空则说明有错误日志，继而发送报警信息
[ -s $Error_log/$logfile ] && echo -e"$HOSTNAME \n `cat $Error_log/$logfile`" | mail -s "$HostnameKeepalived VIP Removed" $mail
#截取上一次检查到的行数至当前行数的日志并检索出含有" added "字段的日志，并重定向到相应的ERROR日志文件
sed -n"$new_last_count,$current_count p" $Log_directory/$logfile | grep ‘IP172.16.10.188 added‘ > $Error_log/$logfile && echo "`date`$logfile error " || echo "`date` $logfile changed but no error"
#判断ERROR日志是否存在且不为空，不为空则说明有错误日志，继而发送报警信息
[ -s $Error_log/$logfile ]&& echo -e "$HOSTNAME \n `cat $Error_log/$logfile`" | mail -s"$Hostname Keepalived VIP Added" $mail
#结束本次操作之后把当前的行号作为下一次检索的last number
echo $current_count >$Last_num_d/$logfile
done
添加计划任务每分钟执行
# crontab -e
* * * * * /usr/local/shell/check_keepalived.sh
原文地址：http://12270625.blog.51cto.com/12260625/1885590
