As DevOps, we often make quite a lot of mistakes and one of the most oversight mistakes we generally do is forget to expose a port for the container. When you realize that you have not exposed any port for the container then you start looking for ways to change the port mapping of a live container or in other words, …

When we package any application using Docker then either we create Dockerfile or docker-compose.yaml, even you can create both the files and share the files with others. There is one important aspect in both the files .i.e. PORT. Any container which you build and ship to other developers has to have one or more …

I usually work with multiple projects at once and whenever there is a new feature on which I had to work, I usually create a new Branch from my Master branch and once I am done with the new feature I do create a pull request and after the approval, I do merge my changes from my new Branch to my Master branch. Well, …

TL;DR What it means: git sent its first request (GET <your-url>/info/refs?service=git-upload-pack for clone and fetch, git-receive-pack for push) and the server answered with a redirect to a different path. git only follows a redirect that keeps the same /info/refs?service=... tail; anything else, for example …

Terraform worksapces is a very logical concept where you can have multiple states of your infrastructure configuration. To put this in simple words if you are running an infrastructure configuration in development environment then the same infrastructure can be run in the production environment. The main benefit of …

Terraform file always grows as you span your infrastructure and add multiple servers to your cloud-hosted infrastructure. But imagine you have terraform file which contains lots of resources but you only do not want to apply the complete terraform configuration but instead, you just want to run one specific or some …

TL;DR One container: docker restart <name-or-id>. Only that container stops and starts again; the others keep running. Reproduced below with nginx, redis and postgres side by side. Grace period: docker restart --timeout 30 <name> waits up to 30 seconds for the process to exit cleanly before killing it. The …

TL;DR TL;DR A Terraform module is any directory of .tf files; the directory you run terraform apply in is the root module, and every module block calls a child module from it. A module needs three files to be useful: main.tf, variables.tf and outputs.tf, which is the layout the Terraform docs recommend for a minimal …

While working on my Spring Boot Microservices with Docker I felt a need to edit some of the files present under my docker container. But when I tried to edit the file nano application.yaml it throws me an error bash: nano: command not found. So I was not able to edit the file which is present inside my running docker …

TL;DR The message is literal. Failed to start docker.service: Unit docker.service not found. means there is no file called docker.service under /usr/lib/systemd/system/. Docker Engine is not installed, however many docker commands you have run. dnf install docker does not install Docker on CentOS, Rocky or RHEL 9. It …