keepalived + haproxy + mysql 构建高可用
1、keepalived 的高可用是主备，有一台作为备用
2、keepalived + haproxy 搭建的高可用是可以两台都会调度的高可用
拓扑图：
keepalived：负责抢占虚拟ip，使用vrrp协议
haproxy：负责做访问调度，减轻单点压力，单独监听一个端口，这里用23306
1.安装mysql
分别在两台机器上面搭建mysql，并做主从配置，这里不做介绍
2.搭建haproxy
1、download 源码包，下载地址：http://www.haproxy.org/#down
2、在81.128和81.129解压缩安装
tar xf haproxy-1.8.4.tar.gz
cd haproxy-1.8.4
yum install -y gcc
make TARGET=linux310 ARCH=x86_64 # uname -a查看主机信息填写
make install SBINDIR=/usr/sbin/ MANDIR=/usr/share/man/ DOCDIR=/usr/share/doc/
3、提供启动脚本
#!/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.
[ "$NETWORKING" = "no" ] && exit 0
exec="/usr/sbin/haproxy"
prog=$(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
esac4、提供配置文件
mkdir /etc/haproxy
mkdir /var/lib/haproxy
useradd -r haproxy
vim /etc/haproxy/haproxy.cfg
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
defaults
mode tcp
log global
option dontlognull
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 600
listen stats
mode http
bind :6677
stats enable
stats hide-version
stats uri /haproxyadmin?stats
stats realm Haproxy\ Statistics
stats auth admin:admin
stats admin if TRUE
frontend main
bind *:23306
default_backend mysql
backend mysql
balance leastconn
server m1 192.168.81.128:3306 check port 3306 maxconn 300
server m2 192.168.81.129:3306 check port 3306 maxconn 300
5、修改日志系统
###Provides UDP syslog reception //去掉下面两行注释，开启UDP监听
$ModLoad imudp
$UDPServerRun 514
local2.* /var/log/haproxy.log //添加此行
service rsyslog restart
6、启动测试haproxy
service haproxy start
chkconfig --add haproxy
chkconfig haproxy on
netstat -tnlp
mysql -P23306 -uroot -p123456 -h192.168.81.129 # 查看server_id，判断是否成功
3.搭建keepalived
1、download 源码包，下载地址：http://www.keepalived.org/download.html
2、在81.128和81.129解压缩安装
tar xf keepalived-1.2.7.tar.gz
cd keepalived-1.2.7
./configure --prefix=/usr/local/keepalived --sbindir=/usr/sbin/ --sysconfdir=/etc/ --mandir=/usr/local/share/man/
make && make install
chkconfig --add keepalived
chkconfig keepalived on
3、提供配置文件
vim /etc/keepalived/keepalived.conf # 两个机器配置文件不同
! Configuration File for keepalived
global_defs {
notification_email { # 忽略
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
script "/etc/keepalived/chk.sh" # 检查haproxy的脚本
interval 2 # 每两秒检查一次
}
vrrp_instance VI_1 {
state BACKUP # 定义为BACKUP节点
nopreempt # 开启不抢占，另一个不写
interface ens33
virtual_router_id 51
priority 100 # 开启了不抢占，所以此处优先级必须高于另一台，另一个写99
advert_int 1
authentication {
auth_type PASS
auth_pass abcd
}
virtual_ipaddress {
192.168.81.150 # 配置VIP
}
track_script {
chk_haproxy # 调用检查脚本
}
notify_backup "/etc/init.d/haproxy restart"
notify_fault "/etc/init.d/haproxy stop"
}
4、创建check文件
vim /etc/keepalived/chk.sh
#!/bin/bash
if [ $(ps -C haproxy --no-header | wc -l) -eq 0 ]; then
/etc/init.d/keepalived stop
fichmod +x /etc/keepalived/chk.sh
service keepalived start
5、测试
ip addr # 查看是否绑定了虚ip
tcpdump -nn -i ens33 vrrp # 抓包查看
http://192.168.81.128:6677/haproxyadmin?stats # 通过haproxy查看状态