Docker

Finally, they’re available! Wait a moment.. Actually they’re available for few months, just nobody published information about moving them to quay.io and dropped poor guys using hub.docker.com without any updates! Yes, that how they did! I found new place accidentally, reading some news about CentOS Stream 9 on their blog. There was reference to CentOS 9 Stream dev builds of Docker images and I found “missing” stream and stream8 tags too....

It’s sometimes useful to quickly connect to JMX console, to checkout what’s going on in your application, but the whole thing get’s tricky if you’re running your app in a container. I need it from time to time and I keep myself few times searching for set of params below: ~/2021/02/how-to-run-jmx-monitoring-in-docker-image/ java \ ... -Dcom.sun.management.jmxremote \ -Dcom.sun.management.jmxremote.rmi.port=${PORT1} \ -Dcom.sun.management.jmxremote.port=${PORT1} \ -Dcom.sun.management.jmxremote.local.only=false \ -Dcom.sun.management.jmxremote.authenticate=false \ -Dcom.sun.management.jmxremote.ssl=false \ -Djava....

We’re all divided with recent decision to focus on CentOS Stream, which essentially means that stable, professional distro will turn into rolling release now. Also CentOS board members don’t gave us more confidence for the future. I don’t want to be totally sceptic, I would like to test it on my own and only then, decide if it’s stable enough. But I work mostly with Docker containers and there are no official Docker images with Stream variant....

TL;DR CentOS base images sucks! They’re old, not updated for months! As a professional DevOps I concern about a lot of things… but security is always close to the top of the list. With Docker build environments and deployments became much more stable, which often is a result of just being stale ;/ I’ve been talking about this for long time but it’s still hard for people to believe it....

I’m playing a lot with Docker lately. Building images, and then rebuilding, and then building again… It’s pretty boring. To automate this task a little I used inotify to build automatically after I changed any file. This trick could be used in many different situations. You will need inotify-tools package: sudo apt-get install -y inotify-tools Then run something like this: while inotifywait -e modify -r .; do docker-compose build; done This commands will rebuild my Docker images after any file change in current directory....

When I started playing with Docker I was running a lot of commands to build image, delete containers running on old image, run containers based on new image, etc… A lot of log commands with links, volumes, etc… Then I started searching for something to automate this task and here I get to docker-compse command, this is how you may install it: pip install docker-compose And install additional bash completions (run as root):...

I’ve played with Docker a little in it early days but didn’t stick for longer with it. It’s stable now so I wanted to check how it’s running now. I really can’t accept this method of installation: curl -fsSL https://get.docker.com/ | sh I think that world is going to it’s end when I see such scritps… I prefer to do this manually, knowing exactly what I have to do. Install prerequisites:...

I started playing with Docker and here I will write some commands that where not so obvious at beginning 😃 List running containers: docker ps List also not running containers: docker ps -a Remove all containers (be careful with that): docker rm $(docker ps -a -q) Remove all images: docker rmi $(docker images -q) Docker won’t remove any old volumes used by containers, so after some time you may be interested in deleting them all:...