Nginx + Keepalived实现应用高可用负载均衡功能

tar -zvxf keepalived-1.4.0.tar.gz
cd keepalived-1.4.0

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

yum -y install libnl libnl-devel

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

yum install -y libnfnetlink-devel

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

make && make install

mkdir /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/etc/init/keepalived.conf /etc/init.d/keepalived
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

vi /etc/init.d/keepalived

#!/bin/sh
#
# keepalived High Availability monitor built upon LVS and VRRP
#
# chkconfig: - 86 14
# description: Robust keepalive facility to the Linux Virtual Server project \
# with multilayer TCP/IP stack checks.### BEGIN INIT INFO
# Provides: keepalived
# Required-Start: $local_fs $network $named $syslog
# Required-Stop: $local_fs $network $named $syslog
# Should-Start: smtpdaemon httpd
# Should-Stop: smtpdaemon httpd
# Default-Start:
# Default-Stop: 0 1 2 3 4 5 6
# Short-Description: High Availability monitor built upon LVS and VRRP
# Description: Robust keepalive facility to the Linux Virtual Server
# project with multilayer TCP/IP stack checks.
### END INIT INFO# Source function library.
. /etc/rc.d/init.d/functionsexec="/usr/local/keepalived/sbin/keepalived"
prog="keepalived"
config="/etc/keepalived/keepalived.conf"[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$proglockfile=/var/lock/subsys/keepalivedstart() {
[ -x $exec ] || exit 5
[ -e $config ] || exit 6
echo -n $"Starting $prog: "
daemon $exec $KEEPALIVED_OPTIONS
retval=$?
echo
[ $retval -eq 0 ] && touch $lock-file
return $retval
}stop() {
echo -n $"Stopping $prog: "
killproc $prog
retval=$?
echo
[ $retval -eq 0 ] && rm -f $lockfile
return $retval
}restart() {
stop
start
}reload() {
echo -n $"Reloading $prog: "
killproc $prog -1
retval=$?
echo
return $retval
}force_reload() {
restart
}rh_status() {
status $prog
}rh_status_q() {
rh_status &>/dev/null
}case "$1" in
start)
rh_status_q && exit 0
$1
;;
stop)
rh_status_q || exit 0
$1
;;
restart)
$1
;;
reload)
rh_status_q || exit 7
$1
;;
force-reload)
force_reload
;;
status)
rh_status
;;
condrestart|try-restart)
rh_status_q || exit 0
restart
;;
*)
echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
exit 2
esac
exit $?

chmod 755 /etc/init.d/keepalived

vi /etc/rc.local

chmod 755 /etc/rc.local

vi /etc/keepalived/keepalived.conf

global_defs {
router_id 30# 设置nginx-master服务器的ID，这个值在整个keepalived高可用架构中是唯一的，此处用IP末尾数标识
}vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh" # 配置keepalived监控nginx负载均衡服务器状态的脚本，看nginx是否挂掉等情况，然后做相应处理
interval 5 # 检测脚本执行的时间间隔，单位是秒
}vrrp_instance VI_1 {
state MASTER # 指定keepalived的角色，MASTER为主，BACKUP为辅
interface eth0# 指定当前进行VRRP通讯的接口卡（此处是centos的网卡）
virtual_router_id 51# 虚拟路由编号，主从要一致，以表明主从服务器属于同一VRRP通讯协议小组
mcast_src_ip 192.168.182.130#本机IP地址
priority 100# 优先级，数值越大，处理请求的优先级越高
advert_int 1# 检查间隔，默认1s（vrrp组播周期秒数）
authentication {
auth_type PASS
auth_pass 1111
}
track_script {# 调用检测脚本
check_nginx
}
virtual_ipaddress {# 定义虚拟IP（VIP）,可设置多个，每行一个，两个节点设置的虚拟IP必须一致
192.168.182.100
}
}

#!/bin/bash
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
/usr/local/nginx/sbin/nginx
sleep 2
counter=$(ps -C nginx --no-heading|wc -l)
if [ "${counter}" = "0" ]; then
/etc/init.d/keepalived stop
fi
fi

#user nobody;
worker_processes 1;#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;#pid logs/nginx.pid;events {
worker_connections 1024;
}http {
include mime.types;
default_type application/octet-stream; #log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"'; #access_log logs/access.log main; sendfile on;
#tcp_nopush on; #keepalive_timeout 0;
keepalive_timeout 65; #gzip on;
upstream serverCluster{
server 192.168.182.131:8080 weight=1;
server 192.168.182.132:8080 weight=1;
}
server {
listen 8888; # 此处默认80修改为8888
server_name localhost; #charset koi8-r; #access_log logs/host.access.log main; location / {
root html;
index index.html index.htm;
} #error_page 404 /404.html; # redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
} # proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#} # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#} # deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
} # another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias; # location / {
# root html;
# index index.html index.htm;
# }
#} server{
listen 80;
server_name localhost; location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://serverCluster;
expires 3d;
}
}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost; # ssl_certificate cert.pem;
# ssl_certificate_key cert.key; # ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m; # ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on; # location / {
# root html;
# index index.html index.htm;
# }
#}}