System Code Geeks Operating System Developers Resource Center

It happens because the docker client (on macOS or Windos 10) allows you to sign in with your email address and password. If you sign out and sign in with your Docker Username and password everything will work. So here’s a better description of the issue Description When trying to pull images from the Docker registry docker: Error response from daemon: ...

Abstract Suppose you want to start multiple Derby network servers on the same host. They need to be listening on different ports and ideally store their data in different locations. The listings below show Linux bash and Windows batch scripts to configure starting a Derby network server. In this example, the Derby network server will listen on port 1110. Each ...

After writing more and more bash scripts for a client, I’ve decided to write down my thoughts about it. This assumes you have some knowledge about bash, as it is not intended as a beginner’s tutorial. Why bash scripts? Bash is present in almost every unix/linux-based stack, now some Windows as well. An exception is the ‘alpine’ docker images, which ...

10 UNIX Productivity tips Have you ever amazed to see someone working very fast in UNIX, firing commands and doing things quickly? Yes, I have seen that a couple of times and I have always inspired to learn from those superstar developers. In this article or tutorial or whatever you call it, I have dedicated to sharing some UNIX command ...

Finally, came across a packaging manger for windows, where I can easily install windows software, the way its meant to be, unobtrusive and smooth. Chocolatey is not the fanciest tool out there, but the one for which I  long felt a need and while you can argue that docker does that much fancier, but on a dev box, this is ...

Xubuntu is one of the most popular among the “lighter” distros as it hardly consumes 200MB when idle and even older machines are able to run with acceptable performance. Ubuntu-MATE which is based on MATE Desktop (a GNOME-2 fork) is also a similar competing distro though its debatable whether its as light as Xubuntu in terms of resource consumption. Making ...

The zsh shell, such as many others, supports aliases to minimize the amount of typing required. Beside simple command aliases, zsh comes with a multitude of extended alias features. Normal, or command aliases are very helpful for commands that you keep typing all over again. How often do you type git status, mvn clean install, or docker build yourself, manually? ...

On my last conference talk (it was about Ansible and Docker at DevOpsCon in Berlin), I was asked what is the best way to run Ansible on a Windows system. Ansible itself requires a Linux-based system as the control machine. When I have to develop on a Windows machine, I install a Linux-based virtual machine to run the Ansible’s playbooks ...

In my previous post, I showed why Cockroach DB might help you if you need a cloud native SQL database for your application. I explained how to install it in Kubernetes/OpenShift and how to validate that the data is replicated correctly. In this post, I am going to show you how to use Cockroach DB in a Spring Boot application. Notice that ...