Multiple websites on a single host with Docker

It is not possible to run multiple web applications in Docker at the same time. Since all of them use port 80, only one Docker instance is accessible.

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Submitted by Masood Lodin on Sun, 11/19/2017 - 01:47
3 answers

The problem can be solved by using a Nginx reverse proxy. Each application will be exposed through a corresponding sub-domain.

Dockerfile:

FROM nginx:alpine
COPY nginx.conf /etc/nginx/conf.d/default.conf
COPY proxy.conf /etc/nginx/includes/proxy.conf

proxy.conf:

proxy_redirect off;
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_set_header X-Forwarded-Proto $scheme;
proxy_buffering off;
proxy_request_buffering off;
proxy_http_version 1.1;
proxy_intercept_errors off;

nginx.conf:

# pm config.
server {
listen 80;
server_name site1.myproject.com;
location / {
include /etc/nginx/includes/proxy.conf;
proxy_pass http://site1_webserver_1;
}
access_log off;
error_log /var/log/nginx/error.log error;
}
# api config.
server {
listen 80;
server_name site1.myproject.com;
location / {
include /etc/nginx/includes/proxy.conf;
proxy_pass http://site2_webserver_1;
}
access_log off;
error_log /var/log/nginx/error.log error;
}
# Default
server {
listen 80 default_server;
server_name _;
root /var/www/html;
charset UTF-8;
access_log off;
log_not_found off;
error_log /var/log/nginx/error.log error;
}

The proxy_pass is the name of the application's docker container.

Submitted by Masood Lodin on Sun, 11/19/2017 - 01:57

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I think you misunderstood the problem. There are multiple independent docker instances, but all have to listen on port 80 on the same machine at the same time.

Submitted by Masood Lodin on Thu, 11/30/2017 - 23:52

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Serving multiple websites on a single host with Docker is against the principles of Docker and micro service architecture. Sure you can do it but what is blocking you from separating it into multiple docker instances. That way, if there is a problem not all of the sites go down. By separating the hosts, you make it easier the diagnose possible problems and minimize down time.

Submitted by Can Özgür Yilmaz on Thu, 11/30/2017 - 11:18

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