This post has been republished via RSS; it originally appeared at: New blog articles in Microsoft Community Hub.
Sometimes we want to have applications developed in various languages in one App Service. There is a solution - Docker Compose. However, it is still in Preview status, so it is not recommended to use it in Production environment. There are also some limitations. In this article, I would like to use a sample app service to introduce a method to do the same thing by using nginx and custom docker container.
The current method does not obey the recommendation of Docker that a docker container should host only one service, and we actually recommend customers use Azure Container App for hosting multiple applications.
We will create a Docker container to have nginx installed and use it as a reverse proxy to redirect the request from external to different applications.
The above picture shows that the request comes from outside firstly arrived at the nginx service at port 8082 in the container. If the request url is ending with /php/, the request will be direct to the Apache server listening 80 port. Otherwise, the request will be processed in node express server.
Firstly, we need to create a Docker image. I use below Dockerfile for creating the image:
- Use an Apache image container so I do not need to install Apache 8.0.
- Then install node.js, npm and nginx.
- "RUN echo "ServerName localhost:80" >> /etc/apache2/apache2.conf" will configure Apache server to use port 80 to recieve the request.
- Copy modified nginx.conf, defaut files to configure the nginx to use reverse proxy and expected port to receive request.
- Change the start.sh file permission to make sure it can run properly.
- At the end of the Dockerfile, it will launch start.sh file.
Below is the modified part of the nginx.conf:
Below is the modified default file which change the nginx default port to 8081 to avoid port conflicts with Apache which uses port 80.
Below is the start.sh file which is created to start the related application and service. Explanations are in comments.
In the example, I simply use php.info file as a PHP application and express_demo.js as a node application. Please refer to below public GitHub repository for the whole project:
After you create the docker image and use app service to pull it from your docker repository. You need to make sure that a application setting WEBSITES_PORT is set to 8082 as your nginx is listening to 8082.
This example is just for your reference. Actually, to host a PHP application, you do not need to have a separated Apache service but just need to use the existing nginx web server. You may refer to below document for setting this:
PHP FastCGI Example | NGINX
However, purely using Nginx as a reverse proxy is totally OK as you can have flexibility to choose other applications' web servers.