Docker based reverse proxy with NginX for multiple domains

Question

I'm trying to create a docker based multi-container setup with a reverse proxy for multiple domains to serve, where the websites, the databases and the nginx based reverse proxy run in containers, but I don't know what am I missing (I'm new to nginx).

Details:

• NginX based docker container for reverse proxy
• There are 2 domains I own
  • e.g.: my_example_domain_1.com, my_example_domain_2.net
• I would like to put a container behind each domain name to serve the two domains
  • I would like to run two separated websites: e.g.: two WordPress websites
• I need the NginX route between the two domains and corresponding containers

My example: (basedir: multi-container)

nginx_revproxy/default.conf:

server { listen 80; server_name localhost; location / { root /usr/share/nginx/html; index index.html index.htm; } error_page 500 502 503 504 /50x.html; location = /50x.html { root /usr/share/nginx/html; } } server { listen 80; server_name my_example_domain_1.com; location / { proxy_pass http://wp1:80; } } server { listen 80; server_name my_example_domain_2.net; location / { proxy_pass http://wp2:80; } } 

./nginx_revproxy/Dockerfile:

FROM nginx:stable-alpine COPY default.conf /etc/nginx/conf.d EXPOSE 80/tcp EXPOSE 443/tcp CMD ["/bin/sh", "-c", "exec nginx -g 'daemon off;';"] WORKDIR /usr/share/nginx/html 

./docker-compose.yml

version: '3.7' services: revproxy: container_name: revproxy build: nginx_revproxy restart: always networks: - mynet db1: container_name: db1 image: mysql:5.7 volumes: - "${PWD}/data_mysql1:/var/lib/mysql" - "/tmp/db_site1:/tmp" restart: always environment: MYSQL_ROOT_PASSWORD: somewordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress networks: - mynet db2: container_name: db2 image: mysql:5.7 volumes: - "${PWD}/data_mysql2:/var/lib/mysql" - "/tmp/db_site2:/tmp" restart: always environment: MYSQL_ROOT_PASSWORD: somewordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress networks: - mynet wp1: container_name: wp1 depends_on: - db1 - revproxy image: wordpress:latest ports: - "8081:80" restart: always environment: WORDPRESS_DB_HOST: db1:3306 WORDPRESS_DB_USER: wordpress WORDPRESS_DB_PASSWORD: wordpress WORDPRESS_DB_NAME: wordpress volumes: - "${PWD}/data_wordpress1:/var/www/html" - "/tmp/wp_site1:/tmp" networks: - mynet wp2: container_name: wp2 depends_on: - db2 - revproxy image: wordpress:latest ports: - "8082:80" restart: always environment: WORDPRESS_DB_HOST: db2:3306 WORDPRESS_DB_USER: wordpress WORDPRESS_DB_PASSWORD: wordpress WORDPRESS_DB_NAME: wordpress volumes: - "${PWD}/data_wordpress2:/var/www/html" - "/tmp/wp_site2:/tmp" networks: - mynet volumes: data_mysql1: data_mysql2: data_wordpress1: data_wordpress2: networks: mynet: 

Sidenotes:

• TEST: If I take out the revproxy from the docker-compose.yml file and execute docker-compose up -d on my desktop machine, I can access both websites (without the revproxy) on the container ports: localhost:8081, localhost:8082
• PROD: When I execute docker-compose up -d on my server, the websites can't be reached
• PROD: all containers seem to run without error

$ docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 974fa178b964 wordpress:latest "docker-entrypoint.s…" 45 seconds ago Up 41 seconds 0.0.0.0:8081->80/tcp wp1 bdace64331b7 wordpress:latest "docker-entrypoint.s…" 45 seconds ago Up 41 seconds 0.0.0.0:8082->80/tcp wp2 9877a41d4bfa multi-container-2_revproxy "/bin/sh -c 'exec ng…" 47 seconds ago Up 41 seconds 80/tcp, 443/tcp revproxy e88e226499f2 mysql:5.7 "docker-entrypoint.s…" 47 seconds ago Up 44 seconds 3306/tcp, 33060/tcp db2 9feaec1b2314 mysql:5.7 "docker-entrypoint.s…" 47 seconds ago Up 44 seconds 3306/tcp, 33060/tcp db1 

• PROD:

$ docker logs -f revproxy 2020/04/09 08:34:21 [emerg] 1#1: host not found in upstream "wp1" in /etc/nginx/conf.d/default.conf:20 nginx: [emerg] host not found in upstream "wp1" in /etc/nginx/conf.d/default.conf:20 

• PROD: all of the containers seem to share the same network interface

$ docker inspect multi-container_mynet docker inspect multi-container_mynet [ { "Name": "multi-container_mynet", "Id": "24e1dd604427db695709056290b9c86021674916d57133b24e33fe765cd26165", "Created": "2020-04-09T10:44:59.568919008+02:00", "Scope": "local", "Driver": "bridge", "EnableIPv6": false, "IPAM": { "Driver": "default", "Options": null, "Config": [ { "Subnet": "172.31.0.0/16", "Gateway": "172.31.0.1" } ] }, "Internal": false, "Attachable": true, "Ingress": false, "ConfigFrom": { "Network": "" }, "ConfigOnly": false, "Containers": { "18d60a010dafca22dd03c2f60cf1b2a607f7ac19ea00e88cd6baff6ada392545": { "Name": "revproxy", "EndpointID": "14974557d1876df15e35ffacb333a4d15883b7645cd90fe819cc2763118c7151", "MacAddress": "02:42:ac:1f:00:02", "IPv4Address": "172.31.0.2/16", "IPv6Address": "" }, "4b591fcb01c464d9ce932ab8e67e9409c2e19e725ab75faa5bcfd2c322ced1b8": { "Name": "db1", "EndpointID": "a3631f7943701b333b203e48d816853ef7da4739cfbd265edc6126aad9fbc832", "MacAddress": "02:42:ac:1f:00:04", "IPv4Address": "172.31.0.4/16", "IPv6Address": "" }, "885434c047c3eb2f5794a307a51dc5057384744a5483857474e41c697d2c954d": { "Name": "db2", "EndpointID": "d1840498f59f96840f44e1b91be0a69ff00cd78e06fea736e8f22f01e7fb8a94", "MacAddress": "02:42:ac:1f:00:03", "IPv4Address": "172.31.0.3/16", "IPv6Address": "" }, "9d90045cfe089418cb1886af89f79780f0d52f08bb876241c3d90d5fa5ab0dfd": { "Name": "wp1", "EndpointID": "2052ae635d5317e6928bb961d183c280add219b09ac042fc56a6f26c3410531e", "MacAddress": "02:42:ac:1f:00:06", "IPv4Address": "172.31.0.6/16", "IPv6Address": "" }, "b9caf876f7f4f8bbf2d77c422f0179e647bcfd22b0129de0a83c90360df54612": { "Name": "wp2", "EndpointID": "479bbd8d29cff9644c008316c91cdecac75f3f8ef107ad59f0d2e4683cd4b81c", "MacAddress": "02:42:ac:1f:00:05", "IPv4Address": "172.31.0.5/16", "IPv6Address": "" } }, "Options": {}, "Labels": { "com.docker.compose.network": "mynet", "com.docker.compose.project": "multi-container", "com.docker.compose.version": "1.23.1" } } ] 

Does anyone have any idea?

Answer 1

Meanwhile I've figured it out on my own..
This is a working configuration (if anyone interested in the future):

nginx_revproxy/default.conf:

upstream domain1 { server wp1:80; } upstream domain2 { server wp2:80; } server { listen 80; server_name domain1.com; location / { proxy_pass http://domain1/; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } server { listen 80; server_name domain2.com; location / { proxy_pass http://domain2/; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } 

nginx_revproxy/Dockerfile:

FROM nginx:stable-alpine COPY default.conf /etc/nginx/conf.d EXPOSE 80/tcp EXPOSE 443/tcp CMD ["/bin/sh", "-c", "exec nginx -g 'daemon off;';"] WORKDIR /usr/share/nginx/html 

docker-compose.yml:

version: '3.7' services: revproxy: container_name: revproxy build: nginx_revproxy depends_on: - wp1 - wp2 restart: always ports: - 80:80 networks: - mynet db1: container_name: db1 image: mysql:5.7 volumes: - "${PWD}/data_mysql1:/var/lib/mysql" - "/tmp/db_site1:/tmp" restart: always environment: MYSQL_ROOT_PASSWORD: somewordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress networks: - mynet db2: container_name: db2 image: mysql:5.7 volumes: - "${PWD}/data_mysql2:/var/lib/mysql" - "/tmp/db_site2:/tmp" restart: always environment: MYSQL_ROOT_PASSWORD: somewordpress MYSQL_DATABASE: wordpress MYSQL_USER: wordpress MYSQL_PASSWORD: wordpress networks: - mynet wp1: container_name: wp1 depends_on: - db1 image: wordpress:latest ports: - "8081:80" restart: always environment: WORDPRESS_DB_HOST: db1:3306 WORDPRESS_DB_USER: wordpress WORDPRESS_DB_PASSWORD: wordpress WORDPRESS_DB_NAME: wordpress volumes: - "${PWD}/data_wordpress1:/var/www/html" - "/tmp/wp_site1:/tmp" networks: - mynet wp2: container_name: wp2 depends_on: - db2 image: wordpress:latest ports: - "8082:80" restart: always environment: WORDPRESS_DB_HOST: db2:3306 WORDPRESS_DB_USER: wordpress WORDPRESS_DB_PASSWORD: wordpress WORDPRESS_DB_NAME: wordpress volumes: - "${PWD}/data_wordpress2:/var/www/html" - "/tmp/wp_site2:/tmp" networks: - mynet volumes: data_mysql1: data_mysql2: data_wordpress1: data_wordpress2: networks: mynet: 

Thank you for all your help!

Answer 2

This is repeating the good work done by Traefik, Hitch and Others.