摘要：以的網(wǎng)絡(luò)管理，容器的設(shè)置為基礎(chǔ)知識(shí)實(shí)現(xiàn)負(fù)載均衡查看所有網(wǎng)絡(luò)是上一篇介紹時(shí)，文件所在的目錄名，所以，用創(chuàng)建的容器會(huì)默認(rèn)創(chuàng)建一個(gè)以目錄名為網(wǎng)絡(luò)名的網(wǎng)絡(luò)，并且是橋接類型指定容器地址官網(wǎng)文檔地址繼續(xù)編寫(xiě)上一篇使用容器編排工具文章中的

以Docker的網(wǎng)絡(luò)管理，容器的IP設(shè)置為基礎(chǔ)知識(shí)實(shí)現(xiàn)Nginx負(fù)載均衡

查看所有docker網(wǎng)絡(luò)

docker network ls

/*
NETWORK ID          NAME                  DRIVER              SCOPE
b832b168ca9a        bridge                bridge              local
373be82d3a6a        composetest_default   bridge              local
a360425082c4        host                  host                local
154f600f0e90        none                  null                local

*/

// composetest_default 是上一篇介紹Compose時(shí)，docker-compose.yml文件所在的目錄名，
// 所以，用docker-compose創(chuàng)建的容器會(huì)默認(rèn)創(chuàng)建一個(gè)以目錄名為網(wǎng)絡(luò)名的網(wǎng)絡(luò)，并且是dridge（橋接）類型

指定容器IP地址

官網(wǎng)文檔地址：https://docs.docker.com/compo...

繼續(xù)編寫(xiě)上一篇《12.使用Docker Compose容器編排工具》文章中的docker-compose.yml

version: "3"
services:
    web1:
        container_name: web1
        image: "centos:httpd"
        ports:
            - "8080:80"
        privileged: true
        volumes:
            - "/app/www/web1/:/var/www/html/"
        command: ["/usr/sbin/init"]
        networks:
            nginx-lsb:
                ipv4_address: 192.169.0.3
    web2:
        container_name: web2
        image: "centos:httpd"
        ports:
            - "8081:80"
        privileged: true
        volumes:
            - "/app/www/web2/:/var/www/html/"
        command: ["/usr/sbin/init"]
        networks:
            nginx-lsb:
                ipv4_address: 192.169.0.2
networks:
    nginx-lsb:
        driver: bridge
        ipam:
            config:
                - subnet: 192.169.0.0/16

使用docker-compose啟動(dòng)容器

docker-compose up -d

查看容器是否啟動(dòng)，并確認(rèn)是否創(chuàng)建了網(wǎng)絡(luò) nginx-lsb

// 可以查看當(dāng)前docker-compose.yml配置的容器組里的容器狀態(tài)
docker-compose ps

docker network ls

/*
NETWORK ID          NAME                    DRIVER              SCOPE
b832b168ca9a        bridge                  bridge              local
373be82d3a6a        composetest_default     bridge              local
de6f5b8df1c8        composetest_nginx-lsb   bridge              local
a360425082c4        host                    host                local
154f600f0e90        none                    null                local
*/

// 創(chuàng)建了nginx-lsb網(wǎng)絡(luò)，命名是容器組項(xiàng)目的 文件名開(kāi)頭_網(wǎng)絡(luò)名

查看網(wǎng)絡(luò) nginx-lsb的詳情

docker network inspect composetest_nginx-lsb

// 詳情里面可以看到使用這個(gè)網(wǎng)絡(luò)的每個(gè)容器的ip

如：

/*
...
 "Containers": {
            "039aa860ef04f20a7566fdc943fb4398a61d2ad6dd3e373b17c86ac778af89e3": {
                "Name": "web2",
                "EndpointID": "1bc206661179e65999015f132c2889d3d4365b8d42b8a89cf9c260016fedd5ee",
                "MacAddress": "02:42:c0:a9:00:02",
                "IPv4Address": "192.169.0.2/16",
                "IPv6Address": ""
            },
            "437ad7a07da8e46c0abaf845c4b08425338009fbe972bde69478cf47c75c315b": {
                "Name": "web1",
                "EndpointID": "5a36e602a5364ee9ad06e9816d09e3966d56ebf06b9394ebc25b8bcee9546607",
                "MacAddress": "02:42:c0:a9:00:03",
                "IPv4Address": "192.169.0.3/16",
                "IPv6Address": ""
            }
        },
...
*/

使用 env_file環(huán)境文件：

簡(jiǎn)單可以理解為：在docker-compose.yml中定義變量，引用在外部.env文件中進(jìn)行變量定義

官方文檔地址：https://docs.docker.com/compo...

// 還是在composetest目錄中定義個(gè) .env文件，用來(lái)存放變量
web1_addr=192.169.0.2
web2_addr=192.169.0.3

// 修改docker-compose.yml文件，加入變量定義
version: "3"
services:
    web1:
        container_name: web1
        image: "centos:httpd"
        ports:
            - "8080:80"
        privileged: true
        volumes:
            - "/app/www/web1/:/var/www/html/"
        command: ["/usr/sbin/init"]
        networks:
            nginx-lsb:
                ipv4_address: ${web1_addr}
    web2:
        container_name: web2
        image: "centos:httpd"
        ports:
            - "8081:80"
        privileged: true
        volumes:
            - "/app/www/web2/:/var/www/html/"
        command: ["/usr/sbin/init"]
        networks:
            nginx-lsb:
                ipv4_address: ${web2_addr}
networks:
    nginx-lsb:
        driver: bridge
        ipam:
            config:
                - subnet: 192.169.0.0/16

重新啟動(dòng)composetest項(xiàng)目，并查看網(wǎng)絡(luò)詳情，確認(rèn)容器ip是否設(shè)置成功

// 重新啟動(dòng)composetest項(xiàng)目
docker-compose up -d

// 查看網(wǎng)絡(luò)詳情
docker network inspect composetest_nginx-lsb

在composetest項(xiàng)目中添加一臺(tái)nginx服務(wù)器作為負(fù)載均衡服務(wù)器

// 在.env文件里添加一個(gè)變量 nginx_lsb
web1_addr=192.169.0.2
web2_addr=192.169.0.3
nginx_lsb=192.169.0.100

// 修改docker-compose.yml文件，加入變量定義
version: "3"
services:
    nginx-lsb:
        container_name: nginx-lsb
        image: "centos:nginx"
        ports: 
            - "8000:80"
        privileged: true
        volumes:
            - "/app/nginx/nginx.conf:/etc/nginx/nginx.conf"
        networks:
            nginx-lsb:
                ipv4_address: ${nginx_lsb}
    web1:
        container_name: web1
        image: "centos:httpd"
        ports:
            - "8080:80"
        privileged: true
        volumes:
            - "/app/www/web1/:/var/www/html/"
        command: ["/usr/sbin/init"]
        networks:
            nginx-lsb:
                ipv4_address: ${web1_addr}
    web2:
        container_name: web2
        image: "centos:httpd"
        ports:
            - "8081:80"
        privileged: true
        volumes:
            - "/app/www/web2/:/var/www/html/"
        command: ["/usr/sbin/init"]
        networks:
            nginx-lsb:
                ipv4_address: ${web2_addr}
networks:
    nginx-lsb:
        driver: bridge
        ipam:
            config:
                - subnet: 192.169.0.0/16

// 重新啟動(dòng)composetest項(xiàng)目
docker-compose up -d

修改nginx.conf配置文件，配置負(fù)載均衡

upstream mydocker {
    server 192.169.0.2;
    server 192.169.0.3;
}

server {
    listen 80；
    server_name mydocker;
    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_buffering off;
        proxy_pass http://mydocker;
    }
}

重新啟動(dòng)nginx-lsb，加載配置文件

docker-composer restart nginx-lsb

訪問(wèn) http://服務(wù)器IP地址:8000，測(cè)試服務(wù)器負(fù)載均衡！

注意：上一篇已經(jīng)在兩臺(tái)httpd服務(wù)器上放置了不同的web文件

原文鏈接：http://www.mi#/articles/20