HaProxy+Keepalived+Mycat高可用群集配置

概述

本章节主要介绍配置HaProxy+Keepalived高可用群集，Mycat的配置就不在这里做介绍，可以参考我前面写的几篇关于Mycat的文章。

部署图：

配置

 HaProxy安装

181和179两台服务器安装haproxy的步骤一致

--创建haproxy用户
useradd haproxy

--解压完后进入haproxy目录
cd haproxy-1.4./

--编译安装
make TARGET=linux26 PREFIX=/usr/local/haproxy ARCH=x86_64

make install PREFIX=/usr/local/haproxy

HaProxy配置

cd /usr/local/haproxy

touch haproxy.cfg

vim haproxy.cfg

global
log 127.0.0.1 local0 ##记日志的功能
maxconn 4096
chroot /usr/local/haproxy
user haproxy
group haproxy
daemon
defaults
log global
option dontlognull
retries 3
option redispatch
maxconn 2000
contimeout 5000
clitimeout 50000
srvtimeout 50000
listen admin_stats 192.168.57.180:48800 ##统计页面
stats uri /admin-status 
stats auth admin:admin
mode http
option httplog
listen mycat_service 192.168.57.180:18066 ##客户端就是通过这个ip和端口进行连接，这个vip和端口绑定的是mycat8066端口
mode tcp
option tcplog
option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www
balance roundrobin
server mycat_181 192.168.57.181:8066 check port 48700 inter 5s rise 2 fall 3
server mycat_179 192.168.57.179:8066 check port 48700 inter 5s rise 2 fall 3
srvtimeout 20000

listen mycat_admin 192.168.57.180:19066 ##客户端就是通过这个ip和端口进行连接，这个vip和端口绑定的是mycat9066端口
mode tcp
option tcplog
option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www
balance roundrobin
server mycat_181 192.168.57.181:9066 check port 48700 inter 5s rise 2 fall 3
server mycat_179 192.168.57.179:9066 check port 48700 inter 5s rise 2 fall 3
srvtimeout 20000

配置haproxy记录日志功能

yum –y install rsyslog

mkdir /etc/rsyslog.d

cd /etc/rsyslog.d/

touch haproxy.conf

vim haproxy.conf

$ModLoad imudp
$UDPServerRun 514
local0.* /var/log/haproxy.log

vim /etc/rsyslog.conf

在#### RULES ####上面一行加入以下内容

# Include all config files in /etc/rsyslog.d/
$IncludeConfig /etc/rsyslog.d/*.conf

在local7.* /var/log/boot.log下面加入以下内容

local0.* /var/log/haproxy.log

重启rsyslog服务

service rsyslog restart

将rsyslog加入自动启动服务

chkconfig --add rsyslog
chkconfig --level 2345 rsyslog on

配置监听mycat是否存活

安装xinetd插件

yum install xinetd -y

cd /etc/xinetd.d

touch mycat_status

vim mycat_status

service mycat_status
{
flags = REUSE
socket_type = stream
port = 48700
wait = no
user = nobody
server =/usr/local/bin/mycat_status
log_on_failure += USERID
disable = no
}

创建xinetd启动服务脚本

vim /usr/local/bin/mycat_status

#!/bin/bash
#/usr/local/bin/mycat_status.sh
# This script checks if a mycat server is healthy running on localhost. It will
# return:
#
# "HTTP/1.x 200 OK\r" (if mycat is running smoothly)
#
# "HTTP/1.x 503 Internal Server Error\r" (else)
mycat=`/usr/local/mycat/bin/mycat status |grep 'not running'| wc -l`
if [ "$mycat" = "0" ];
then
/bin/echo -e "HTTP/1.1 200 OK\r\n"
else
/bin/echo -e "HTTP/1.1 503 Service Unavailable\r\n"
fi

修改脚本文件权限

我就是在这里被坑了很久,根据权威指南上面mycat_status这个脚本里面的内容也有很多问题，好几个地方没有空格.

chmod 777 /usr/local/bin/mycat_status
chmod 777 /etc/xinetd.d/mycat_status

将启动脚本加入服务

vim /etc/services

在末尾加入

mycat_status 48700/tcp # mycat_status

重启xinetd服务

service xinetd restart

将xinetd加入自启动服务

chkconfig --add xinetd
chkconfig --level 2345 xinetd on

页面测试

http://192.168.57.180:48800/admin-status

由于179还没有安装好，所以这里179显示连接失败

创建haproxy启停脚本

启动脚本

touch /usr/local/haproxy/sbin/start
chmod +x /usr/local/haproxy/sbin/start
vim  /usr/local/haproxy/sbin/start

#!/bin/sh
/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg &

关闭脚本

touch /usr/local/haproxy/sbin/stop
chmod +x /usr/local/haproxy/sbin/stop
vim /usr/local/haproxy/sbin/stop

#!/bin/sh
ps -ef | grep sbin/haproxy | grep -v grep |awk '{print $2}'|xargs kill -s 9

授权

chown -R haproxy.haproxy /usr/local/haproxy/*

Keepalived安装步骤

keepalived的安装步骤过程在两台服务器上除了keepalived.conf配置文件稍微有点区别外其他的地方都一致。

openssl安装

./config --prefix=/usr/local/openssl
./config -t
make depend
make
make test
make install
ln -s /usr/local/openssl /usr/local/ssl

vim /etc/ld.so.conf

在文件末尾加入以下内容

/usr/local/openssl/lib

修改环境变量

vim /etc/profile

在文件末尾加入以下内容

export OPENSSL=/usr/local/openssl/bin
export PATH=$PATH:$OPENSSL

使环境变量立刻生效

source /etc/profile

安装openssl-devel

yum install openssl-devel -y

测试

ldd /usr/local/openssl/bin/openssl

linux-vdso.so.1 => (0x00007fff996b9000)
libdl.so.2 =>/lib64/libdl.so.2 (0x00000030efc00000)
libc.so.6 =>/lib64/libc.so.6 (0x00000030f0000000)
/lib64/ld-linux-x86-64.so.2 (0x00000030ef800000)

which openssl

/usr/bin/openssl

openssl version

OpenSSL 1.0.0-fips 29 Mar 2010

keepalived安装

./configure --prefix=/usr/local/keepalived
make
make install
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

创建配置文件和脚本

mkdir /etc/keepalived/scripts

cd /etc/keepalived/scripts

vim /etc/keepalived/keepalived.conf

master

! Configuration Fileforkeepalived
vrrp_script chk_http_port {
script"/etc/keepalived/scripts/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER #192.168.57.179上改为BACKUP
interface eth0 #对外提供服务的网络接口
virtual_router_id 51 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
priority 150 #数值愈大，优先级越高,backup上改为120
advert_int 1 #同步通知间隔
authentication { #包含验证类型和验证密码。类型主要有PASS、AH两种，通常使用的类型为PASS，据说AH使用时有问题
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port #调用脚本check_haproxy.sh检查haproxy是否存活
}
virtual_ipaddress { #vip地址，haproxy配置的使用的就是这里配置的VIP
192.168.57.180 dev eth0 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
}

backup

! Configuration Fileforkeepalived
vrrp_script chk_http_port {
script"/etc/keepalived/scripts/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP #192.168.57.179上改为BACKUP
interface eth0 #对外提供服务的网络接口
virtual_router_id 51 #VRRP组名，两个节点的设置必须一样，以指明各个节点属于同一VRRP组
priority 120 #数值愈大，优先级越高,backup上改为120
advert_int 1 #同步通知间隔
authentication { #包含验证类型和验证密码。类型主要有PASS、AH两种，通常使用的类型为PASS，据说AH使用时有问题
auth_type PASS
auth_pass 1111
}
track_script {
chk_http_port #调用脚本check_haproxy.sh检查haproxy是否存活
}
virtual_ipaddress { #vip地址
192.168.57.180 dev eth0 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
}

vim /etc/keepalived/scripts/check_haproxy.sh

#!/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 "[check_haproxy status]" >> $LOGFILE
A=`ps -C haproxy --no-header |wc -l`
echo "[check_haproxy status]" >> $LOGFILE
date >> $LOGFILE
if [ $A -eq 0 ];then
echo $STARTHAPROXY >> $LOGFILE
$STARTHAPROXY >> $LOGFILE 2>&1
sleep 5
fi
if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then
exit 0
else
exit 1
fi

vim /etc/keepalived/scripts/haproxy_master.sh

#!/bin/bash
STARTHAPROXY=`/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg`
STOPHAPROXY=`ps -ef | grep sbin/haproxy | grep -v grep | awk '{print $2}'| xargs kill -s 9`
LOGFILE="/usr/local/keepalived/var/log/keepalived-haproxy-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "stop haproxy...." >> $LOGFILE 2>&1
$STOPHAPROXY >> $LOGFILE 2>&1
echo "start haproxy...." >> $LOGFILE 2>&1
$STARTHAPROXY >> $LOGFILE 2>&1
echo "haproxy stared ..." >> $LOGFILE

vim /etc/keepalived/scripts/haproxy_backup.sh

#!/bin/bash
STARTHAPROXY=`/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/haproxy.cfg`
STOPHAPROXY=`ps -ef | grep sbin/haproxy | grep -v grep | awk '{print $2}'| xargs kill -s 9`
LOGFILE="/usr/local/keepalived/var/log/keepalived-haproxy-state.log"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being backup...." >> $LOGFILE 2>&1
echo "stop haproxy...." >> $LOGFILE 2>&1
$STOPHAPROXY >> $LOGFILE 2>&1
echo "start haproxy...." >> $LOGFILE 2>&1
$STARTHAPROXY >> $LOGFILE 2>&1
echo "haproxy stared ..." >> $LOGFILE

vim /etc/keepalived/scripts/haproxy_fault.sh

#!/bin/bash
LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.log
echo "[fault]" >> $LOGFILE
date >> $LOGFILE

vim /etc/keepalived/scripts/haproxy_stop.sh

#!/bin/bash
LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.log
echo "[stop]" >> $LOGFILE
date >> $LOGFILE

 赋予脚本可执行权限

chmod 777 /etc/keepalived/scripts/*

将keepalived加入自启动服务

chkconfig --add keepalived
chkconfig --level 2345 keepalived on

--启动服务
service keepalived start

总结

权威指南上面代码部分好多处都存在问题，几乎每一块代码都存在问题，有时候往往一个空格需要花很长的时间去找这个问题，所以在代码方面要细心；特别是复制别人的代码不要原本照抄最好是检查一下，除了代码本身的问题权限有时候也是容易忽略的错误，特别是可执行文件要注意是否有可执行权限。

备注：

作者：pursuer.chen

博客：http://www.cnblogs.com/chenmh

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