mysql之PXC5.7.18集群系列——2.HAProxy

1. 相关准备

官方网站：http://www.haproxy.org

IP：172.16.3.30

2. 编译安装

# cd /home/soft/haproxy.1.7.8

# make TARGET=linux26 prefix=/home/soft/haproxy

# make install PREFIX=/home/soft/haproxy

备注：uname -r，查看TARGET=linux??

3. 创建用户

# useradd haproxy

4. 开放端口

# iptables -I INPUT -p tcp -m multiport –dport 80,3306,3307 -j ACCEPT

# service iptables save

# service iptables restart

备注：开放端口目的，配置下一步的haproxy.cfg

5. 配置haproxy.cfg

# vim /etc/haproxy/haproxy.cfg

global
log 127.0.0.1 local0
log 127.0.0.1 local1 notice
maxconn 4096
chroot /usr/share/haproxy
user haproxy
group haproxy
daemon

defaults
log global
mode http
option tcplog
option dontlognull
retries 3
option redispatch
maxconn 2000
timeout connect 5s #haproxy端
timeout client  8h #mysql client端
timeout server  1h #mysql server端

frontend pxc-front
bind *:3307
mode tcp
default_backend pxc-back

frontend stats-front
bind *:80
mode http
default_backend stats-back

frontend pxc-onenode-front
bind *:3308
mode tcp
default_backend pxc-onenode-back

backend pxc-back
mode tcp
balance leastconn
option httpchk
server mysql01 172.16.3.31:3306 check port 9200 inter 12000 rise 3 fall 3
server mysql02 172.16.3.32:3306 check port 9200 inter 12000 rise 3 fall 3
server mysql03 172.16.3.33:3306 check port 9200 inter 12000 rise 3 fall 3

backend stats-back
mode http
balance roundrobin
stats uri /haproxy/stats
stats auth admin:haproxy

backend pxc-onenode-back
mode tcp
balance leastconn
option httpchk
server mysql01 172.16.3.31:3306 check port 9200 inter 12000 rise 3 fall 3
server mysql02 172.16.3.32:3306 check port 9200 inter 12000 rise 3 fall 3 backup
server mysql03 172.16.3.33:3306 check port 9200 inter 12000 rise 3 fall 3 backup

备注：1.frontend *** 配置的端口需开放
备注：2.uri /haproxy/stats，配置网页地址
备注：3.auth admin:haproxy，配置账号密码

6. 配置service haproxy

# vim /etc/init.d/haproxy

#!/bin/sh
#
# haproxy
#
# chkconfig:   - 85 15
# description:  HAProxy is a free, very fast and reliable solution \
#               offering high availability, load balancing, and \
#               proxying for TCP and  HTTP-based applications
# processname: haproxy
# config:      /etc/haproxy/haproxy.cfg
# pidfile:     /var/run/haproxy.pid

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

exec="/home/soft/haproxy/sbin/haproxy"
prog=$(basename $exec)

[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog

cfgfile=/etc/haproxy/haproxy.cfg
pidfile=/var/run/haproxy.pid
lockfile=/var/lock/subsys/haproxy

check() {
$exec -c -V -f $cfgfile $OPTIONS
}

start() {
$exec -c -q -f $cfgfile $OPTIONS
if [ $? -ne 0 ]; then
echo "Errors in configuration file, check with $prog check."
return 1
fi

echo -n $"Starting $prog: "
# start it up here, usually something like "daemon $exec"
daemon $exec -D -f $cfgfile -p $pidfile $OPTIONS
retval=$?
echo
[ $retval -eq 0 ] && touch $lockfile
return $retval
}

stop() {
echo -n $"Stopping $prog: "
# stop it here, often "killproc $prog"
killproc $prog
retval=$?
echo
[ $retval -eq 0 ] && rm -f $lockfile
return $retval
}

restart() {
$exec -c -q -f $cfgfile $OPTIONS
if [ $? -ne 0 ]; then
echo "Errors in configuration file, check with $prog check."
return 1
fi
stop
start
}

reload() {
$exec -c -q -f $cfgfile $OPTIONS
if [ $? -ne 0 ]; then
echo "Errors in configuration file, check with $prog check."
return 1
fi
echo -n $"Reloading $prog: "
$exec -D -f $cfgfile -p $pidfile $OPTIONS -sf $(cat $pidfile)
retval=$?
echo
return $retval
}

force_reload() {
restart
}

fdr_status() {
status $prog
}

case "$1" in
start|stop|restart|reload)
$1
;;
force-reload)
force_reload
;;
check)
check
;;
status)
fdr_status
;;
condrestart|try-restart)
[ ! -f $lockfile ] || restart
;;
*)
echo $"Usage: $0 {start|stop|status|restart|try-restart|reload|force-reload}"
exit 2
esac

备注：如果启动错误，请仔细查看错误提示，修改行号22-29的文件路径

7.clustercheck

(1) 添加clustercheck权限

mysql> grant process on *.* to 'clustercheckuser'@'localhost' identified by 'clustercheckpassword!';

mysql> flush privileges;

# clustercheck

HTTP/1.1 200 OK

备注：此时，数据库已处于集群状态，因此在任意一个Node下登陆mysql执行即可

(2) xinetd守护进程

# yum -y install xinetd

# vim /etc/services

mysqlchk 9200/tcp #add mysqlchk

# vim /etc/xinetd.d/mysqlchk

# default: on
# description: mysqlchk
service mysqlchk
{
# this is a config for xinetd, place it in /etc/xinetd.d/
disable = no
flags           = REUSE
socket_type     = stream
type            = UNLISTED
port            = 9200
wait            = no
user            = nobody
server          = /usr/bin/clustercheck
log_on_failure  += USERID
only_from       = 0.0.0.0/0
#
# Passing arguments to clustercheck
# <user> <pass> <available_when_donor=0|1> <log_file> <available_when_readonly=0|1> <defaults_extra_file>"
# Recommended: server_args   = user pass 1 /var/log/log-file 0 /etc/my.cnf.local"
# Compatibility: server_args = user pass 1 /var/log/log-file 1 /etc/my.cnf.local"
# 55-to-56 upgrade: server_args = user pass 1 /var/log/log-file 0 /etc/my.cnf.extra"
#
# recommended to put the IPs that need
# to connect exclusively (security purposes)
per_source      = UNLIMITED
}

# service xinetd restart

备注：PXC每个Node下安装xinetd

8.启动haproxy

# /home/soft/haproxy/sbin/haproxy start

9.监控页面

http://172.16.3.30/haproxy/stats

备注：admin,haproxy