I’ve not made any posts for a while but it’s not because I haven’t been busy doing some things. I’ve played a little with Bootstrap and you can see where I’m at with that by going to https://www.controlledthinking.com/bootstrap/index.html
I also tinkered around a little bit with my Github repositories and you can find me there at https://github.com/brintoul/
I went through this Spring Framework page describing running a Spring Boot application in a Docker container. Pretty cool. I will investigate Spring Boot some more and also the Dockerfile used to create the image being used. There are a couple of new items I’ve never seen, including “ENTRYPOINT” and “VOLUME”.
What I’d like to do is add a bit of database access to this skeletal project. Maybe utilize the MySQL Docker image I downloaded a few days ago with this new Spring Boot image to make a CRUD-type application with the two images.
I got a Spring Data JPA project going and working against my Docker MySQL image. One difficulty I ran into was the port on which MySQL is running. I’m already running MySQL on this machine, so 3306 is in use. And when I fire up the image, it’s just grabbing a random port which makes it difficult to configure the Spring app’s datasource. Not sure how much I’ll work on that for now…
Today I’m continuing to look at Docker. I am going to look into creating my own images and playing with some existing ones. I’ve pulled the MySQL image and I’m going to poke around on it. I might also look at securing a container or the daemon with some keys.
Hold on! It seems there’s something I don’t quite get about images and containers. I tried to remove one of the images I downloaded during the tutorial, but I was told it was in use by a container. I ran “docker ps” and didn’t see any running. Why are these containers hanging around? I’ve gotta investigate that.
I found a couple relevant pages. Here and here.
So I was browsing Reddit (where I’m a proud member of the 11-year club) and I found this article. Interesting and funny.
I downloaded and installed the new Netbeans IDE (version 8.2) and noticed that it had Docker support. It’s been a while since I looked at Docker, so today I’m going to revisit it.
Got Docker upgraded and running by following the online tutorial. When I tried to add the Docker instance to Netbeans, I noticed I’d have to change the daemon’s configuration to listen on a TCP port (instead of a Unix socket that I think it runs on by default). After modifying /etc/default/docker and adding the instance to Netbeans, I could no longer use the client commands like “docker images”. After sorting through the docs for a while, I found out that the Docker client will use the “DOCKER_HOST” environment variable to set the “-H” option (for “host”).
I also set up a Docker Hub account while going through the tutorial.
In any case, I’ve got a few ideas I’d like to try to exercise Docker a little bit and hopefully I’ll be able to get to it and log what I do on this blog.