# If you need Docker to use an HTTP proxy, it can also be specified here. In order to route Docker traffic through a proxy, we will need to uncomment this line and replace the default value with our proxy address. Within the /etc/default/docker file, there is a line that is commented by default which specifies the http_proxy environmental variable. On Ubuntu (which is the OS our Docker host is running), we can configure Docker to do this by simply editing the /etc/default/docker file. This will allow Docker to indirectly communicate with docker.io. In order for this to work within our network, Docker will need to route its request through a proxy. The reason is also pretty obvious: access to docker.io was blocked. INFO Get : dial tcp 52.22.146.88:443: connection refusedįrom the above execution, we can see that the docker build results in a download error of the base ubuntu image. Sending build context to Docker daemon 12.29 kB Let's go ahead and attempt to execute a docker build to see what happens by default in a 'locked down' network. RUN is used to execute commands, in this case apt-get commands. The above Dockerfile only has two instructions: FROM, which is used to specify which base image to build the container from, and RUN. RUN apt-get update & apt-get install -y curl While this example is simple, it will require us to leverage a proxy in several ways.īefore jumping into the proxy settings however, let's take a quick look at the Dockerfile we will be building from. In this article, we will be building a simple ubuntu-based container that uses apt-get to install curl.

For today's article, we will use Docker to build and run a simple container within a 'locked down' network. While this setup is generally transparent to the end user, this type of network environment often neglects command line tools such as Docker. More often than not, a corporate network will route all internet traffic through a proxy. Often in large corporate networks this is simply not the case.

Today I'll show how to use Docker without direct internet access.īy default, Docker assumes that the system running Docker and executing Docker commands has general access to the internet.

In today's article, I am going to explore a common pain point for anyone running Docker in a large corporate environment.

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