nginx+負載均衡+keepalive+雙機熱備

時間 2019-11-08

標籤 nginx 負載均衡 keepalive 欄目 Nginx 简体版

原文原文鏈接

最近搭建keepalived雙機熱備, 在網上博採衆之所長, 整理一下本身的筆記!html

在新搭建的centos6.x下最好下載一下阿里雲的源配置:linux

　　centos：http://mirrors.aliyun.com/help/centosnginx

一、備份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backupc++

二、下載新的CentOS-Base.repo 到/etc/yum.repos.d/

CentOS 5

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repoweb

或者vim

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repocentos

CentOS 6

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo緩存

或者tomcat

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repobash

CentOS 7

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

或者

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

三、以後運行yum makecache生成緩存

===============================================================================================================================

　　準備2臺電腦來作這個實驗:

　　192.168.232.137 web服務器　　keepalived nginx
　　192.168.232.138 web服務器　　keepalived nginx

　　虛擬IP (VIP)：192.168.232.17

　　虛擬IP (VIP)：192.168.232.18

nginx下載地址:　　http://nginx.org/en/download.html

keepallived下載地址: http://www.keepalived.org/download.html

在137上:(ngnix和keepalived須要的依賴環境)

　　安裝依賴:

　　　　　　su - root

　　　　　　　yum -y install gcc gcc+ gcc-c++

　　OpenSSL: yum install -y openssl openssl-*

　　pcre庫:　　yum install -y pcre pcre-devel

　　zlib庫: 　　yum install -y zlib zlib-devel

　　　　　　　yum -y install lrzsz

　　　　　　 yum -y install openssh-clients

　　　　　　　yum -y install libssl-dev libnl libnl-devel

　　　　　　　yum -y install popt popt-devel

　　安裝內核:

　　　　　　　yum -y install kernel kernel-devel*

===================================================================================================================================

1. 安裝keepalived

/usr/local/下:　　wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz

　　　　　　　 tar -zxvf keepalived-1.2.2.tar.gz

　　　　　　　　cd keepalived-1.2.2
　　　　　　　　./configure --prefix=/usr/local/keepalived
　　　　　　　　make
　　　　　　　　make install

拷貝相應的文件

1.拷貝執行文件

　　cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

2.將init.d文件拷貝到etc下,加入開機啓動項

　　cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/keepalived

3.將keepalived文件拷貝到etc下，加入網卡配置

　　cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/

4.建立keepalived文件夾

　　mkdir -p /etc/keepalived

5.將keepalived配置文件拷貝到etc下

　　cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf

6.添加可執行權限

　　chmod +x /etc/init.d/keepalived

2.啓動keepalived

啓動：service keepalived start

中止：service keepalived stop

重啓：service keepalived restart

3. 配置日誌文件

1.將keepalived日誌輸出到local0：

　　vim /etc/sysconfig/keepalived

　　KEEPALIVED_OPTIONS="-D -d -S 0"

2.在/etc/rsyslog.conf裏添加:

　　local0.* /var/log/keepalived.log

3.從新啓動keepalived和rsyslog服務：

　　service rsyslog restart

　　service keepalived restart

4. 打開防火牆的通信地址

iptables -A INPUT -d 224.0.0.18 -j ACCEPT

/etc/rc.d/init.d/iptables save

===================================================================================================================================

1. 安裝nginx

/usr/local/下: 　　wget http://nginx.org/download/nginx-1.10.3.tar.gz

　　　　　　　　tar -zxvf linux-nginx-1.10.2.tar.gz　　　

　　　　　　　　mkdir -p /var/temp/nginx　　　　

./configure \
--prefix=/usr/local/nginx \
--pid-path=/var/run/nginx/nginx.pid \
--lock-path=/var/lock/nginx.lock \
--error-log-path=/var/log/nginx/error.log \
--http-log-path=/var/log/nginx/access.log \
--with-http_gzip_static_module \
--http-client-body-temp-path=/var/temp/nginx/client \
--http-proxy-temp-path=/var/temp/nginx/proxy \
--http-fastcgi-temp-path=/var/temp/nginx/fastcgi \
--http-uwsgi-temp-path=/var/temp/nginx/uwsgi \
--http-scgi-temp-path=/var/temp/nginx/scgi

　　　　　　　　make
　　　　　　　　make install
　　　　　　　　whereis nginx

2.啓動nginx

cd /usr/local/nginx/sbin/
./nginx

./nginx -s quit

查看進程: ps -ef|grep nginx

3.測試nginx

service iptables stop

chkconfig iptables off

訪問: 192.168.200.137

4.配置nginx

配置虛擬主機
反向代理
負載均衡
upstream tomcat_server_pool{
server 192.168.101.5:8080 weight=10;
server 192.168.101.6:8080 weight=10;
}

server {
listen 80;
server_name aaa.test.com;
location / {
proxy_pass http://tomcat_server_pool;
index index.jsp index.html index.htm;
}
}

負載均衡特色:
轉發
故障移除
恢復添加
高可用(keepalived + nginx實現主備)

配置高可用

! Configuration File for keepalived

global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
#smtp_server 192.168.200.1 #指定smtp服務器地址
#smtp_connect_timeout 30 #指定smtp鏈接超時時間
router_id LVS_DEVEL #運行keepalived機器的一個標識
}

vrrp_script check_nginx {
script "/etc/keepalived/check_nginx.sh" ##監控腳本
interval 2 ##時間間隔，2秒
weight 2 ##權重
}

vrrp_instance VI_1 {
state MASTER #標示狀態爲MASTER 備份機爲BACKUP
interface eth0 #設置實例綁定的網卡
virtual_router_id 51 #同一實例下virtual_router_id必須相同
priority 100 #MASTER權重要高於BACKUP 好比BACKUP爲99
advert_int 1 #MASTER與BACKUP負載均衡器之間同步檢查的時間間隔，單位是秒
authentication { #設置認證
auth_type PASS #主從服務器驗證方式
auth_pass 1111
}
track_script {
check_nginx ##監控腳本
}
virtual_ipaddress { #設置vip
#192.168.200.16 #能夠多個虛擬IP，換行便可
192.168.200.17
}
}

vrrp_instance VI_2 {
state BACKUP
interface eth1
virtual_router_id 52
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.200.18
}
}

---------------------------------

vim /etc/keepalived/check_nginx.sh

#!/bin/bash
# 若是進程中沒有nginx則將keepalived進程kill掉
A=`ps -C nginx --no-header |wc -l` ## 查看是否有 nginx進程把值賦給變量A
if [ $A -eq 0 ];then ## 若是沒有進程值得爲零
service keepalived stop ## 則結束 keepalived 進程
fi

chmod a+x /etc/keepalived/check_nginx.sh

配置nginx和keepalived開機啓動:

https://www.cnblogs.com/whatmiss/p/7091220.html

vim /etc/init.d/nginx

#!/bin/bash

# nginx Startup script for the Nginx HTTP Server

# it is v.0.0.2 version.

# chkconfig: - 85 15

# description: Nginx is a high-performance web and proxy server.

# It has a lot of features, but it's not for everyone.

# processname: nginx

# pidfile: /var/run/nginx.pid

# config: /usr/local/nginx/conf/nginx.conf

nginxd=/usr/local/nginx/sbin/nginx

nginx_config=/usr/local/nginx/conf/nginx.conf

nginx_pid=/var/run/nginx.pid

RETVAL=0

prog="nginx"

# Source function library.

. /etc/rc.d/init.d/functions

# Source networking configuration.

. /etc/sysconfig/network

# Check that networking is up.

[ ${NETWORKING} = "no" ] && exit 0

[ -x $nginxd ] || exit 0

# Start nginx daemons functions.

start() {

if [ -e $nginx_pid ];then

echo "nginx already running...."

exit 1

echo -n $"Starting $prog: "

daemon $nginxd -c ${nginx_config}

RETVAL=$?

echo

[ $RETVAL = 0 ] && touch /var/lock/subsys/nginx

return $RETVAL

}

# Stop nginx daemons functions.

stop() {

echo -n $"Stopping $prog: "

killproc $nginxd

RETVAL=$?

echo

[ $RETVAL = 0 ] && rm -f /var/lock/subsys/nginx /var/run/nginx.pid

}

# reload nginx service functions.

reload() {

echo -n $"Reloading $prog: "

#kill -HUP `cat ${nginx_pid}`

killproc $nginxd -HUP

RETVAL=$?

echo

}

# See how we were called.

case "$1" in

start)

start

;;

stop)

stop

;;

reload)

reload

;;

restart)

stop

start

;;

status)

status $prog

RETVAL=$?

;;

echo $"Usage: $prog {start|stop|restart|reload|status|help}"

exit 1

esac

exit $RETVAL

-----------------------------------------------------------------

chmod a+x /etc/init.d/nginx

chmod a+x /etc/init.d/keepalived

[root@localhost keepalived]# vim /etc/rc.local
#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local
/usr/bin/fdfs_trackerd /etc/fdfs/tracker.conf restart

/usr/bin/fdfs_storaged /etc/fdfs/storage.conf restart

/etc/init.d/nginx start

sleep 1

/etc/init.d/keepalived start