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-1.4.25/
--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
$UDPServerRun 514local0.* /var/log/haproxy.logvim /etc/rsyslog.conf
在#### RULES ####上面一行加入以下内容
# Include all config files in /etc/rsyslog.d/$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 rsyslogchkconfig --level 2345 rsyslog on
配置监听mycat是否存活
安装xinetd插件
yum install xinetd -ycd etc
service mycat_status
{
flags = REUSE
socket_type = stream
port = 48700wait = nouser = 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 xinetdchkconfig --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/opensslvdso.so. ( lib64libdl.so. ( lib64libc.so. (lib64ldlinuxx86.so. (which openssl/usr/bin/opensslopenssl versionOpenSSL 1.0.0-fips 29 Mar 2010keepalived安装
./configure --prefix=/usr/local/keepalivedmake
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 etckeepalivedscripts
cd /etc/keepalived/scriptsvim /etc/keepalived/keepalived.conf
master
! Configuration Fileforkeepalived
vrrp_script chk_http_port {
script"/etc/keepalived/scripts/check_haproxy.sh"
interval 2weight 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VIP192.168.57.180 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 2weight 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 >> $LOGFILEif [ $A -eq 0 ];thenecho $STARTHAPROXY >> $LOGFILE
$STARTHAPROXY >> $LOGFILE 2>&1sleep 5
fiif [ `ps -C haproxy --no-header |wc -l` -eq 0 ];thenexit 0elseexit 1fi
vim /etc/keepalived/scripts/haproxy_master.sh
#!bin`usrlocalhaproxysbinhaproxy f usrlocalhaproxy"usrlocalkeepalivedkeepalivedhaproxystate." $LOGFILE $LOGFILE $LOGFILE $LOGFILE $LOGFILE $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>&1echo "stop haproxy...." >> $LOGFILE 2>&1$STOPHAPROXY >> $LOGFILE 2>&1echo "start haproxy...." >> $LOGFILE 2>&1$STARTHAPROXY >> $LOGFILE 2>&1echo "haproxy stared ..." >> $LOGFILE
vim /etc/keepalived/scripts/haproxy_fault.sh
#!/bin/bash
LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.logecho "[fault]" >> $LOGFILE
date >> $LOGFILEvim /etc/keepalived/scripts/haproxy_stop.sh
#!/bin/bash
LOGFILE=/usr/local/keepalived/var/log/keepalived-haproxy-state.logecho "[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 keepalivedchkconfig --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。
