HaProxy+keepalived+mycat集群实战
http://s3.运维网.com/wyfs02/M02/89/93/wKioL1gXW7-ih8EUAAEeIjG9-ME298.png-wh_500x0-wm_3-wmp_4-s_3736225200.png集群部署图的理解：
1、keepalive和haproxy必须装在同一台机器上，keepalived负责为该服务器抢占VIP。
2、192.168.1.107上的keepalived会抢占VIP，抢占VIP有优先级，配置keepalived.conf中参数priority值越大优先越高，在同等情况下，keepalived服务器启动先得会先抢到VIP。
3、Harpoxy负责将对VIP的请求分发到mycat上，起到负载均衡的作用，同时haproxy也能检测到mycat是否存活，haproxy只会将请求转发到存活的mycat上。
4、如果一台服务器（keepalive+mycat）宕机，另外一台上的keepalived会立刻抢占vip并接管服务，如果一台mycat服务器宕机，haproxy转发时候不会转发到宕机的mycat上.
[*]keepalived的安装配置：
两台机器进行keepalived安装，个别参数区别其他一致。
1、 安装：
#tar -zxvfkeepalived-1.2.19.tar.gz
# cd keepalived-1.2.19 &&./configure --prefix=/usr/local/keepalived &&make&& make install
不报错，表示ok，有些系统可能需要安装gcc这个依赖包
Yum –y install gcc
2、 配置
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived/etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived/etc/init.d/
mkdir /etc/keepalived&& cd /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived
mkdir-p /usr/local/keepalived/var/log
vi/etc/keepalived/keepalived.conf ####Master
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server192.168.200.1
smtp_connect_timeout 30
router_idLVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER##把MASTER改成BACKUP
interface eth1 #和本机网卡接口名一致
virtual_router_id 51
priority 100 ###权重 ,SLAVE点改小于100就好
advert_int 1
authentication{
auth_typePASS
auth_pass1111
}
virtual_ipaddress {
192.168.1.219 dev eth1 scope global
}
notify_master /etc/keepalived/scripts/haproxy_master.sh
notify_backup /etc/keepalived/scripts/haproxy_backup.sh
notify_fault /etc/keepalived/scripts/haproxy_fault.sh
notify_stop /etc/keepalived/scripts/haproxy_stop.sh
}
###到这里可以测试下VIP的漂移功能。
二、安装HAPROXY
1、安装HAPROXY：
#useraddhaproxy
tar -zxvfhaproxy-1.4.20.tar.gz
cdhaproxy-1.4.20 && make TARGET=linux26 PREFIX=/usr/local/haproxyARCH=X86_64 && make install PREFIX=/usr/local/haproxy
chown –Rhaproxy.haproxy /usr/local/haprox
cd /usr/local/haproxy
编辑配置文件haproxy.cfg，以提供，修改内容即可
2、haproxy记录日志，默认haproxy是不记录日志的，为了记录日志还需要配置syslog模块，在linux下是rsyslogd服务，
#yum –y installrsyslog先安装rsyslog
若yum安装rsyslog 有这样问题：
http://s4.运维网.com/wyfs02/M01/89/93/wKioL1gXXAPi9kPFAABxhJs4tOA997.png-wh_500x0-wm_3-wmp_4-s_3384979875.png
一般安装好rsyslog会自动生成rsyslog.d这个目录，若无自己创建
#cd /etc/rsyslog.d/ && touch haproxy.conf
#vim /etc/rsyslog.d/haproxy.conf
$ModLoad imudp
$UDPServerRun 514
local0.* /var/log/haproxy.log ###这个必须和haproxy.cfg的配置文件一致。
#vim /etc/rsyslog.cnf
http://s2.运维网.com/wyfs02/M00/89/95/wKiom1gXXCSxPZC9AAB7MGU5SJk178.png-wh_500x0-wm_3-wmp_4-s_1871194254.png
3、重启服务
#service rsyslogrestart
现在你就可以看到日志（/var/log/haproxy.log）了
到此haproxy+keepalived 的结合完毕，只需要在haproxy.cfg添加服务即可。
[*]配置监听 mycat是否存活
在192.168.1.112 和192.168.1.113 上添加检测端口48700，为此需要用到xinetd,xinetd为LINUX系统基础服务
1、若无xinetd服务，则安装
#yum –y installxinetd
2、检查/etc/xined.conf是否有：
http://s5.运维网.com/wyfs02/M02/89/93/wKioL1gXXEejs8mlAAAgos1XvQg213.png-wh_500x0-wm_3-wmp_4-s_712420538.png若无，则添加。
3、添加/etc/xinetd.d/mycat_status，此目录安装后默认存在。
#vimmycat_status
service mycat_status
{
flags = REUSE
socket_type = stream
port = 48700
wait = no
user = root
server =/usr/local/bin/mycat_status
log_on_failure += USERID
disable = no
}
4、把mycat_status添加到/etc/services服务中去
http://s2.运维网.com/wyfs02/M00/89/95/wKiom1gXXHPyhkgYAAA9nJACaRg738.png-wh_500x0-wm_3-wmp_4-s_2209662831.png
5、/usr/local/bin/mycat_status的脚本，并设置权限777
6、重启服务、验证mycat_status服务是否启动成功
#service xinetd restart
#netstat –antup |grep 48700
http://s2.运维网.com/wyfs02/M02/89/96/wKiom1gXXKPRycFuAAAX4GEe1M4675.png-wh_500x0-wm_3-wmp_4-s_3732285218.png
[*]配置haproxy的脚本脚本，在/etc/keepalived目录添加目录sripts，存放haproxy的脚本脚本。
1、check_haproxy.sh
vi/etc/keepalived/scripts/check_haproxy.sh
##脚本含义：如果没有haproxy进程存在，就启动haproxy，停止keepalived
#!/bin/bash
STARTHAPROXY="/usr/local/haproxy/sbin/haproxy -f/usr/local/haproxy/haproxy.cfg"
STOPKEEPALIVED="/etc/init.d/keepalived stop"
LOGFILE="/usr/local/keepalived/var/log/keepalived-haproxy-state.log"
echo "" >>$LOGFILE
A=`ps-C haproxy --no-header |wc-l`
echo "" >>$LOGFILE
date >>$LOGFILE
if [ $A-eq 0 ];then
echo $STARTHAPROXY>> $LOGFILE
$STARTHAPROXY >> $LOGFILE2>&1
sleep5
fi
if [`ps -C haproxy --no-header |wc-l` -eq 0 ];then
exit 0
else
exit 1
fi
2、haproxy_master.sh(master和slave一样)：
3、haproxy_backup.sh(master和slave一样)
4、haproxy_fault.sh(master和slave一样)
5、haproxy_stop.sh
在/etc/keepalived.conf配置文件去掉#好，启动这些脚本
要给脚本的权限：777
http://s2.运维网.com/wyfs02/M00/89/94/wKioL1gXXOiRZa0BAAAerExqxPw625.png-wh_500x0-wm_3-wmp_4-s_3961955892.png
http://s3.运维网.com/wyfs02/M00/89/94/wKioL1gXXOmAhr3iAAA8yOS9ke8298.png-wh_500x0-wm_3-wmp_4-s_593174943.png
5、重启keepalived 服务
#Service keepalived restart
测试~~~Ing~~~~
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