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Dockerizing Nodejs App - 27 Mar 2015 15:36

Tags: configuration docker image nodejs

This is to follow the example from Docker and I'd like to summarize the essential pieces to get an exsiting nodejs app runing in docker.


FROM    centos:centos6

# Enable EPEL for Node.js
RUN     rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
# Install Node.js and npm
RUN     yum install -y npm

# Bundle app source, to /src
COPY . /src
# Install app dependencies
RUN cd /src; npm install

EXPOSE  8080
CMD ["node", "/src/app.js"]

Build Image

$ sudo docker build -t <your username>/centos-node-hello .

$ sudo docker images

# Example
REPOSITORY                          TAG        ID              CREATED
centos                              centos6    539c0211cd76    8 weeks ago
<your username>/centos-node-hello   latest     d64d3505b0d2    2 hours ago

Run the image

Running your image with -d runs the container in detached mode, leaving the container running in the background. The -p flag redirects a public port to a private port in the container. Run the image you previously built:

$ sudo docker run -p 49160:8080 -d <your username>/centos-node-hello

Print the output of your app:

# Get container ID
$ sudo docker ps

# Print app output
$ sudo docker logs <container id>

# Example
Running on http://localhost:8080


To test your app, get the port of your app that Docker mapped:

$ sudo docker ps

# Example
ID            IMAGE                                     COMMAND              ...   PORTS
ecce33b30ebf  <your username>/centos-node-hello:latest  node /src/index.js         49160->8080

In the example above, Docker mapped the 8080 port of the container to 49160.

Now you can call your app using curl (install if needed via: sudo apt-get install curl):

$ curl -i localhost:49160

If you use Boot2docker on OS X, the port is actually mapped to the Docker host VM, and you should use the following command:

$ curl $(boot2docker ip):49160
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