基於Docker搭建lvs+keepalived+nginx實現高性能負載均衡集羣

服務器

主：172.17.0.2 master   

備:172.17.0.3 slave1

lvs虛擬IP:172.17.0.100

 

#nginx下載地址 http://nginx.org/download/

本地文件路徑

1.dockerfile構建nginx

FROM centos:7
ADD nginx-1.6.0.tar.gz /usr/local
COPY nginx_install.sh /usr/local
RUN sh /usr/local/nginx_install.sh
EXPOSE 80

2.#安裝nginx的shell腳本 nginx_install.sh

#! /bin/bash
yum install -y gcc -c++ make pcre pcre-devel zlib-devel
cd /usr/local/nginx-1.16.0
./configure --prefix=/usr/local/nginx && make && make install

3.構建鏡像

#master: 
docker build -t mycentos:master-nginx .
#slave
docker build -t mycentos:slave1-nginx .

 4.查看構建的鏡像

docker images

 

 5.啓動容器

#master
docker run -itd --privileged=true -p 80:80 mycentos:master-nginx /usr/sbin/init
#slave1
docker run -itd --privileged=true -p 81:80 mycentos:slave1-nginx /usr/sbin/init

6.安裝 keepalived

#keepalived 下載地址
http://nginx.org/download/nginx-1.9.10.tar.gz

7.複製本地keepalived包到docker容器中

#master 容器ID:cf2efc79462d  /usr/local/:複製到容器對應的路徑下
    docker cp keepalived-1.2.18.tar.gz cf2efc79462d:/usr/local/

#slave1 容器ID: bf0ef0ead87c  /usr/local/:複製到容器對應的路徑下
    docker cp keepalived-1.2.18.tar.gz bf0ef0ead87c:/usr/local/

8.分別進入master slave1容器中

1.進入master slave1 容器中
#master
docker exec -it cf2efc79462d /bin/bash

#slave1
docker exec -it bf0ef0ead87c /bin/bash


2.master slave1分別執行以下操作
    2.1解壓安裝：
    tar -zxvf keepalived-1.2.18.tar.gz -C /usr/local/
    2.2下載插件openssl
    yum install -y openssl openssl-devel
    2.3開始編譯keepalived
    cd keepalived-1.2.18/ && ./configure --prefix=/usr/local/keepalived
    2.4進入keepalived-1.2.18目錄 make一下
    make && make install

 

9.keepalived安裝成Linux系統服務

將keepalived安裝成Linux系統服務，因爲沒有使用keepalived的默認安裝路徑（默認路徑：/usr/local）
創建文件夾，將keepalived配置文件進行復制：
mkdir /etc/keepalived
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
複製keepalived腳本文件：
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/sbin/keepalived /usr/sbin/
#如果提示文件已經存在先做rm操作 時入sbin目錄
rm -rf keepalived
ln -s /usr/local/keepalived/sbin/keepalived /sbin/

10.配置keepalived

# maser  cat keepalived.conf 
vrrp_script chk_nginx {
    script "/etc/keepalived/nginx_check.sh"
    interval 2 
    weight -20
}
vrrp_instance VI_1 {
    state MASTER              #指定master
    interface eth0            #網卡信息 進入相應的容器 輸入命令ip a 可以查看相應的網卡信息
    virtual_router_id 100     #所有服務器指定一致
    mcast_src_ip 172.17.0.2   #容器Ip地址 輸入命令ip a 可以查看相應IP地址
    priority 100              
    nopreempt 
    advert_int 1
    authentication {          
        auth_type PASS     
        auth_pass 1111
    }
    
    track_script {
        chk_nginx 
    }

    virtual_ipaddress {     #設置LVS 虛擬VIP
        172.17.0.100
    }
}


#cat nginx_check.sh  重啓nginx腳本
#!/bin/bash
A=`ps -C nginx ?Cno-header |wc -l`
if [ $A -eq 0 ];then
    /usr/local/nginx/sbin/nginx              #啓動Nginx命令
    sleep 2
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
        killall keepalived
    fi
fi

########################################################################

# slave1  cat keepalived.conf 

vrrp_script chk_nginx {
    script "/etc/keepalived/nginx_check.sh"
    interval 2 
    weight -20
}
vrrp_instance VI_1 {
    state BACKUP              #指定BACKUP
    interface eth0            #網卡信息 進入相應的容器 輸入命令ip a 可以查看相應的網卡信息
    virtual_router_id 100     #所有服務器指定一致
    mcast_src_ip 172.17.0.3   #容器Ip地址 輸入命令ip a 可以查看相應IP地址
    priority 100              
    nopreempt 
    advert_int 1
    authentication {          
        auth_type PASS     
        auth_pass 1111
    }
    
    track_script {
        chk_nginx 
    }

    virtual_ipaddress {     #設置LVS 虛擬VIP
        172.17.0.100
    }
}

#cat nginx_check.sh  重啓nginx腳本
#!/bin/bash
A=`ps -C nginx ?Cno-header |wc -l`
if [ $A -eq 0 ];then
    /usr/local/nginx/sbin/nginx              #啓動Nginx命令
    sleep 2
    if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
        killall keepalived
    fi
fi


##############################################################
#分別將這些宿主機的配置文件複製到相應的docker容器中
#master
docker cp keepalived.conf cf2efc79462d:/etc/keepalived
docker cp nginx_check.sh cf2efc79462d:/etc/keepalived

#slave1
docker cp keepalived.conf bf0ef0ead87c:/etc/keepalived
docker cp nginx_check.sh bf0ef0ead87c:/etc/keepalived

11.分別啓動master,slave1 中keepalived

#啓動
service keepalived start
#關閉
service keepalived stop

 

12進入容器中nginx中修改 /nginx/html/index.html

進入master 容器 ip a

 

進入slave1 容器 ip a 

 

13測試

#進入master slave1容器中輸入
curl 172.17.0.100

 master:

 slave1:

 正常情況下只會訪問master服務器 -- master 掛掉的情況下才會訪問slave1 服務器

master容器中執行

#模擬掛掉
service keepalived stop

 

 請求轉移到slave1 服務器中 (curl 172.17.0.100)

slave1 容中執行 ip a

重啓master

#模擬重啓
service keepalived start

 進入master 輸入 ip a

 輸入curl 172.17.0.100

 slave1容中 輸入ip a

 slave1容器中輸入 curl 172.17.0.100