Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker.

Define Docker Container Networking So Containers Can Communicate

April 10, 2017
Nic Raboy

So I was recently playing with Docker using a mixture of docker-compose and the docker commands and I found myself with a container communication issue. I was trying to spin up a container to communicate with containers launched via docker-compose, but my new container couldn’t find these other containers. This is because there was a networking issue between how the Compose containers were running, versus vanilla.

So what do you need to do when it comes to networking and communication between containers?

April 7, 2017
Nic Raboy

Continuous deployment (CD) is a very interesting subject. Being able to establish a build pipeline that deploys your application once building is complete is a fantastic form of automation. Jenkins is one of the most popular, if not the most popular, continuous integration (CI) and continuous deployment tool available. Traditionally one would create a workflow in Jenkins that pulls from Git, builds, and deploys the packaged application to another server via SSH. However, this process could become even more efficient using Docker and containers.

We’re going to see how to use Jenkins to build a Docker image and deploy the image as a container, replacing any previously existing containers in the process.

April 1, 2017
Nic Raboy

I’ve been on and off when it comes to Docker, but lately I’ve been starting to embrace it. In comparison to virtual machines, containers a lot easier to maintain and are more lightweight. While working with containers are great, their true power aren’t made visible until you start clustering them. There are a few clustering and orchestration options, the most popular being Kubernetes and Docker Swarm.

In this guide we’re going to see how to create a simple Docker Swarm cluster on several server nodes that consist of both manager nodes and worker nodes.

March 18, 2017
Nic Raboy

I’ve been working with Docker for a while now and I’ve found that I’m rarely using one of the vanilla images found on Docker Hub. By rarely, I don’t mean never, but in most cases I find that I’m building my own custom Docker image for any web application that I wish to containerize. This allows me to create an image that meets my needs and deploy it anywhere and anytime that I find necessary.

We’re going to see how to build a simple web application and turn it into a Docker image so it is containerized and easily deployable anywhere that Docker Engine is available.

March 15, 2017
Nic Raboy

You might have noticed that I’m doing quite a bit of Docker related articles lately. This is because I’ve been exploring it as an option for the future of my personal web applications. As of right now I’m serving several web applications on Digital Ocean under a single Apache instance. As requests come into my server, Apache routes them to the appropriate application via virtual hosts. Each application is a different directory on the virtual private server (VPS). If I were to containerize each application, things would behave a bit differently. I would need to set up a reverse proxy to route each request to a different container on the host.

While Apache can work as a reverse proxy, there are other options that work way better. For example NGINX is known for being an awesome reverse proxy solution. We’re going to see how to create several web application containers and route between them with an NGINX reverse proxy container.

March 4, 2017
Nic Raboy

When I use Docker, most of the time I start my containers in detached mode, meaning that the container will deploy in the background without any further interaction from myself. However, every once in a while I find myself needing to connect to the container to view log information.

So how do you connect to a detached container that is already running? We’re going to take a look at how to do this with minimal effort.

February 10, 2017
Nic Raboy

So I was researching object storage and I came across the open source distributed object storage software, Minio. This lightweight software was written with Golang and accomplishes similar things to that of Amazon S3. After all they are both object storage solutions. The difference here is that Minio can be deployed on your own hardware.

Being that Minio was written with Golang, it is cross platform for different computing architectures, ARM included. This means that the server software can be installed on Raspberry Pi micro computing devices. Object storage is great for data backups so it gave me the idea to turn my Raspberry Pi into an object storage backup solution.