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Understanding Kubernetes Image Pull Policies

Kubernetes image pull policies control when Kubelet should fetch an updated image version. Pull policies are used when a new Pod is starting up. Kubelet will take the appropriate action indicated by the Pod’s policy….

What Is “GitOps” and Why Does It Matter?

GitOps is an approach to infrastructure that takes the best practices of software development and applies them to IT systems. GitOps builds upon the Infrastructure as Code model to create an automated infrastructure model tha…

How Linux Runlevels Affect Running Services

Linux runlevels distinguish between system operating states. Switching runlevel will change the services which are running. You can customise runlevels so each level starts with a specific set of services….

How and Why to Use A Remote Docker Host

The docker CLI program is independent of the Docker daemon which runs your containers. Although both components usually run on your local machine, you can run docker commands against a remote Docker host….

How to Run MySQL In A Docker Container

Docker containers let you quickly spin up new applications without polluting your system with dependencies. A MySQL database is a common requirement for web-based software. Here’s how to get a new MySQL instance running in Do…

How to Install Docker and Docker Compose on Linux

Docker gives you everything you need to build and run containers on your Linux system. Containers are similar to lightweight virtual machines. They let you create portable application images which run using your host’s operat…

How to Monitor Docker Container Logs

Docker automatically aggregates container standard output and error streams (stdout/stderr) into log feeds which are retained by the Docker daemon. You can easily monitor logs to understand what’s going on in your containers….

Understanding Docker’s “latest” Tag

Docker tags are used to identify images by name. Each image can have multiple tags assigned. Tags look similar to my-image:latest, with the part before the colon defining the image name and the latter section specifying the v…

How to Assess Docker Engine Security

Docker lets software developers and DevOps engineers rapidly package applications for production. Docker containers operate largely independently of their host but aren’t impervious to security threats. Here’s how to audit yo…
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