David: Created page with "== Setting up a Nginx Webserver with Dockerfile == Let's build a static web server with a Dockerfile. The Dockerfile provides a set of instructions for Docker to run on a cont..."

2016-02-18T21:45:05Z

Created page with "== Setting up a Nginx Webserver with Dockerfile == Let's build a static web server with a Dockerfile. The Dockerfile provides a set of instructions for Docker to run on a cont..."

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== Setting up a Nginx Webserver with Dockerfile ==
Let's build a static web server with a Dockerfile. The Dockerfile provides a set of instructions for Docker to run on a container. This lets us automate installing items as if it were a bash script.

Create a new directory and cd into it. Because we're installing Nginx, let's create a default configuration file that we'll use for it.

Create a file called default (the most basic nginx configuration file)

<syntaxhighlight>
[root@blade02 ~]# mkdir nginx-dockerfile
[root@blade02 ~]# cd nginx-dockerfile/
[root@blade02 nginx-dockerfile]# vi default
[root@blade02 nginx-dockerfile]# cat default
server {
root /var/www;
index index.html index.htm;

# Make site accessible from http://localhost/
server_name localhost;

location / {
# First attempt to serve request as file, then
# as directory, then fall back to index.html
try_files $uri $uri/ /index.html;
}
}
</syntaxhighlight>

Now lets create the Docker file;
<syntaxhighlight>
[root@blade02 nginx-dockerfile]# cat Dockerfile
FROM ubuntu

RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
RUN apt-get update
RUN apt-get -y install nginx

RUN echo "daemon off;" >> /etc/nginx/nginx.conf
RUN mkdir /etc/nginx/ssl
ADD default /etc/nginx/sites-available/default

EXPOSE 80

CMD ["nginx"]
</syntaxhighlight>

What's this doing?

* '''FROM''' will tell Docker what image (and tag in this case) to base this off of
* '''RUN''' will run the given command (as user "root") using sh -c "your-given-command"
* '''ADD''' will copy a file from the host machine into the container. This is handy for configuration files or scripts to run, such as a process watcher like supervisord, systemd, upstart, forever (etc)
* '''EXPOSE''' will expose a port to the host machine. You can expose multiple ports like so: EXPOSE 80 443 8888
* '''CMD''' will run a command (not using sh -c). This is usually your long-running process. In this case, we're simply starting Nginx.

In production, we'd want something watching the nginx process in case it fails

We can now build a new docker image from this Dockerfile
<syntaxhighlight>
docker build -t nginx-example .
</syntaxhighlight>

Docker: Building a Server with Dockerfile - Revision history

David: Created page with "== Setting up a Nginx Webserver with Dockerfile == Let's build a static web server with a Dockerfile. The Dockerfile provides a set of instructions for Docker to run on a cont..."