Whilst Docker is a containerisation technology, it's not just about running applications - there's also networking. When you add a container to a docker network, it magically becomes discoverable by other containers on the same network with DNS. All containers use Docker's magical internal DNS server to achieve this. However,ā¦
Self-hosting is a big hobby for me (and a big source of content for my website). Not only is it a great source of entertainment and fun, but I find it incredibly interesting, vaguely relevant to my job, and a good way to regain a little privacy. Over the lastā¦
For me, every Monday is updates day. All machines have OS updates, and the handful which run docker get their containers pulled. However, pulling containers merely updates the underlying container OS, or maybe patch versions of the application (because I do container pinning properly). Updating actual versions can be aā¦
Docker containers (like onions) have layers. In your Dockerfile, each new RUN, COPY or ADD line creates a new layer (so do the others, but not ones which affect the filesystem). Each layer contains only the files which changed from the previous layer, which allows layers to be shared betweenā¦
Docker is a great containerization technology for running applications. It keeps multiple applications completely isolated from each other, only allowing connections exactly when you tell them to. But what if youāre on a hypervisor? You want your host OS to be as lean as possible (else it defeats the point),ā¦
You should back up your data, properly! If youāre not, youāre playing a dangerous game with fate. Computers are pretty reliable, but they also go wrong, often. You should always backup your files, but backing up a containerized application isnāt quite as simple. A container is 3 things:ConfigurationVolumesNetworking The pointā¦
Recently, I started setting up a new application on my docker host. It was late in the day, and I just wanted to get something up and working to play around with. Just my luck, I was met with wonderfully cryptic error:ERROR: could not find an available, non-overlapping IPv4 addressā¦
Docker containers, and containers as a whole, are really just a regular program wrapped in some extra protections provided by the kernel (namely cgroups etc) to create isolation, and other interesting features. Unlike VMs, containers run closer to the host operating system, so close they use the same kernel, meaningā¦
Last year, I switched all of my hosting from arbitrarily installed packages to Docker. This made installing and configuring incredibly simple, but updating a little less defined. Whilst Docker itself is updated through the system package manager (probably), the containers themselves arenāt. Docker container versions are known as ātagsā, andā¦