这里有两台HAProxy机器,分别安装keepalived,组成热备形式。作用:当一台有问题,另一台可以在1秒内接管。
xinetd服务的作用是检测端口,本文中使用8890端口。HAProxy用http协议检测这个端口是否正常。
MySQL同步状态脚本,是放在从库本地,由xinetd服务来激活脚本,正常就会输出200状态码给HAProxy,证明从库正常;否则,就剔除。(这里就可以加上短信报警了)
系统架构图
使用软件
一、系统约定
系统环境
工作流程
准备工作:应用配置好slave的VIP 192.168.1.67 端口3306
(1)应用服务器
(2)连接HAProxy的vip 192.168.1.67:3306,根据算法,分配到一台slave。
(3)检测slave的8890端口是否返回http 200状态码。
(4)返回200 状态码,HAProxy 返回正常,继续服务。
(5)返回503,剔除该slave,并将mysql请求转发到另外一台slave。
(6)有问题的slave,发送短信报警,相关人员检查。
二、Keepalived 1.1.20的安装于配置
#cd /var/tmp/#wget http://www.keepalived.org/software/keepalived-1.1.20.tar.gz#tar zxvf keepalived-1.1.20.tar.gz#cd keepalived-1.1.20#./configure –prefix=/usr#make && make install#cp /usr/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/#cp /usr/etc/sysconfig/keepalived /etc/sysconfig/#mkdir /etc/keepalivedvim /etc/keepalived/keepalived.conf! Configuration File for keepalivedglobal_defs { notification_email { coralzd@gmail.com } notification_email_from coralzd@gmail.com smtp_server 192.168.1.1 smtp_connect_timeout 30 router_id LVS_DEVEL}vrrp_script chk_HAProxy { script "killall -0 HAProxy" interval 2 weight 2 }vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 50 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_interface { eth0 } virtual_ipaddress { 192.168.1.67 } track_script { chk_HAProxy } }
三、HAProxy 1.4.16的安装与配置
#cd /var/tmp/#wget http://HAProxy.1wt.eu/download/1.4/src/HAProxy-1.4.16.tar.gz#tar -zxvf HAProxy-1.4.16.tar.gz#cd HAProxy-1.4.16#make install#mkdir -p /usr/local/HAProxy/etc#mkdir -p /usr/local/HAProxy/sbin#cp examples/HAProxy.cfg /usr/local/HAProxy/etc#ln -s /usr/local/sbin/HAProxy /usr/local/HAProxy/sbin/HAProxy#mkdir /usr/share/HAProxy/etc/HAProxy/HAProxy.cfgglobal log 127.0.0.1 local1 notice maxconn 4096 chroot /usr/share/HAProxy uid 99 gid 99 daemon #debug #quietdefaults log global mode http #option httplog option dontlognull retries 3 option redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000listen DZW_MYSQL_SLAVE 192.168.1.67:3306 #cookie SERVERID rewrite mode tcp maxconn 200 balance roundrobin option httpchk OPTIONS * HTTP/1.1\r\nHost:\ www server mysql_192_168_1_23 192.168.1.23:3306 check port 8890 inter 5s rise 2 fall 3 server mysql_192_168_1_24 192.168.1.24:3306 check port 8890 inter 5s rise 2 fall 3 srvtimeout 20000 listen admin_status mode http bind 192.168.1.65:8899 option httplog log global stats enable stats refresh 10s stats hide-version stats realm Haproxy\ Statistics stats uri /admin-status stats auth admin:123456 stats admin if TRUE
HAProxy 启动脚本
/etc/init.d/HAProxy#!/bin/sh## chkconfig: - 85 15# description: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited \# for high availability environments.# processname: HAProxy# config: /etc/HAProxy/HAProxy.cfg# pidfile: /var/run/HAProxy.pid# Script Author: Simon Matter <simon.matter@invoca.ch># Version: 2004060600# Source function library.if [ -f /etc/init.d/functions ]; then . /etc/init.d/functionselif [ -f /etc/rc.d/init.d/functions ] ; then . /etc/rc.d/init.d/functionselse exit 0fi# Source networking configuration.. /etc/sysconfig/network# Check that networking is up.[ ${NETWORKING} = "no" ] && exit 0# This is our service nameBASENAME=HAProxyif [ -L ___FCKpd___2 ]; then BASENAME=`find ___FCKpd___2 -name $BASENAME -printf %l` BASENAME=`basename $BASENAME`fi[ -f /etc/$BASENAME/$BASENAME.cfg ] || exit 1RETVAL=0start() { /usr/sbin/$BASENAME -c -q -f /etc/$BASENAME/$BASENAME.cfg if [ $? -ne 0 ]; then echo "Errors found in configuration file, check it with '$BASENAME check'." return 1 fi echo -n "Starting $BASENAME: " daemon /usr/sbin/$BASENAME -D -f /etc/$BASENAME/$BASENAME.cfg -p /var/run/$BASENAME.pid RETVAL=$? echo [ $RETVAL -eq 0 ] && touch /var/lock/subsys/$BASENAME return $RETVAL}stop() { echo -n "Shutting down $BASENAME: " killproc $BASENAME -USR1 RETVAL=$? echo [ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/$BASENAME [ $RETVAL -eq 0 ] && rm -f /var/run/$BASENAME.pid return $RETVAL}restart() { /usr/sbin/$BASENAME -c -q -f /etc/$BASENAME/$BASENAME.cfg if [ $? -ne 0 ]; then echo "Errors found in configuration file, check it with '$BASENAME check'." return 1 fi stop start}reload() { /usr/sbin/$BASENAME -c -q -f /etc/$BASENAME/$BASENAME.cfg if [ $? -ne 0 ]; then echo "Errors found in configuration file, check it with '$BASENAME check'." return 1 fi /usr/sbin/$BASENAME -D -f /etc/$BASENAME/$BASENAME.cfg -p /var/run/$BASENAME.pid -sf $(cat /var/run/$BASENAME.pid)}check() { /usr/sbin/$BASENAME -c -q -V -f /etc/$BASENAME/$BASENAME.cfg}rhstatus() { status $BASENAME}condrestart() { [ -e /var/lock/subsys/$BASENAME ] && restart || :}# See how we were called.case "$1" in start) start ;; stop) stop ;; restart) restart ;; reload) reload ;; condrestart) condrestart ;; status) rhstatus ;; check) check ;; *) echo ___FCKpd___2quot;Usage: $BASENAME {start|stop|restart|reload|condrestart|status|check}" exit 1esac exit $?chkconfig –add HAProxy chkconfig HAProxy onservice HAProxy start
四、xinetd安装和配置
yum install -y xinetdvim /etc/xinetd.d/mysql_status.shservice mysqlrep_status{ flags = REUSE socket_type = stream port = 8890 wait = no user = nobody server = /usr/local/bin/mysqlrep_status.sh log_on_failure += USERID disable = no }
重启xinetd
service xinetd restart
MySQL同步检测脚本(脚本检测同步sql和IO进程是否都为真,以及select是否达到20个进程以上)
#!/bin/bash # # /usr/local/bin/mysqlchk_status.sh # # This script checks if a mysql server is healthy running on localhost. It will # return: # # "HTTP/1.x 200 OK\r" (if mysql is running smoothly) # # – OR – # # "HTTP/1.x 503 Internal Server Error\r" (else) # MYSQL_HOST="localhost"MYSQL_PORT="3306"MYSQL_USERNAME="repdb63"MYSQL_PASSWORD="mylqs9eyex7s"# # We perform a simple query that should return a few results #/usr/local/mysql/bin/mysql -hlocalhost –urepdb63 –pmylqs9eyex7s -e "show slave status\G;" > /tmp/rep.txtmysql -urepdb63 -pmylqs9eyex7s -e "show full processlist;" >/tmp/processlist.txtmysql -urepdb63 -pmylqs9eyex7s -e "show slave status\G;" >/tmp/rep.txtiostat=`grep "Slave_IO_Running" /tmp/rep.txt |awk '{print $2}'` sqlstat=`grep "Slave_SQL_Running" /tmp/rep.txt |awk '{print $2}'` result=$(cat /tmp/processlist.txt|wc -l)#echo iostat:$iostat and sqlstat:$sqlstat # if slave_IO_Running and Slave_sql_Running ok,then return 200 code if [ "$result" -lt "20" ] && [ "$iostat" = "Yes" ] && [ "$sqlstat" = "Yes" ];then # mysql is fine, return http 200 /bin/echo -e "HTTP/1.1 200 OK\r\n" else # mysql is down, return http 503 /bin/echo -e "HTTP/1.1 503 Service Unavailable\r\n" fi
注意:在mysql slave另行建立一个具有process和slave_client权限的账号。
作者简介:崔晓辉,网名coralzd,大众网系统管理员,精通网站系统架构、Unix技术。gtalk:coralzd@gmail.com