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/compose/compose-file/#ipv4_address-ipv6_address
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/compose/compose-file/#env_file
// 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！