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Docker Tip #4 - Scrub dangling containers

When running Docker you pull down images. Those images can take up quite a bit of space. After tagging / retagging / untagging you can end up with dangling containers. So a bit of house keeping needs to be done.

The following command line will get rid of the so-called dangling containers:

docker mi $(docker images -q -f "dangling=true")

For bash users the following alias will come in handy

alias docker-scrub='docker mi $(docker images -q -f "dangling=true")'

Enjoy!

Docker Tip #3 - Kill and remove all containers

Using the 2 previous blog entries this becomes trivial if you use bash:

alias docker-down='docker-kill ; docker-rm'

Enjoy!

Docker Tip #2 - Remove all containers

After you have killed all you containers you might wonder how you would go about removing all those killed containers.

Well it is really very easy and similar to killing all the containers.

docker rm $(docker ps -q -a)

And for bash users the alias would be

alias docker-rm='docker rm $(docker ps -q -a)'

Enjoy!

Docker Tip #1 - Kill all your containers

When developing with Docker you'll probably find a need to kill all your docker containers at once. While you certainly can kill them one by one the following commandline takes care of it in a one-liner

docker kill $(docker ps -q)

If you use a bash shell I would recommend you create an alias for it so you can issue the commandline in one go

alias docker-kill='docker kill $(docker ps -q)'

Enjoy!

Do we really think about software?

I have been thinking a lot lately about how we approach software.

OK let me ask you a REALLY important question. When you are writing software that fulfills a business need do you think about how long your software is going to be around?

If you answer NO then you are doing yourself a disservice. While you can be solving the business in the short term you SHOULD also think about the long term.

Or maybe I should ask the business owner the following question? How long are the developers you asked to fulfill your business need going to be around? In our industry you have turnover and as business owner you need to make sure that you set yourself up for SUCCESS which means making sure the software that is chosen to fullfill your business need is used by more than just your current developers.

What do you think are other things we need to keep in mind when writing software?

I would love to hear from you!

 

End of another era

Java.net is going dark!

And it is the end of another era, Java.net is going dark, read about it at https://community.oracle.com/community/java/javanet-forge-sunset

Enjoy!

 

 

JAX-RS wish

 Just like the previous blog entry I have a wish for JAX-RS which would intersect with the CDI specification. I wish that @Inject would work on JAX-RS methods.

What do you think?

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CDI wish

While working with CDI I have always wondered why the CDI JSR does not take over the responsibility of JSR 330 by merging it into the CDI specification.

Do you think the CDI JSR should merge JSR 330 into the CDI specification?

Leave your comments!

 

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Simplifying

As I have been contemplating what to best spend my time on I have decided while for large scale projects you need infrastructure for continous integration, source control, issue tracking, code quality and what not more I do NOT need it for my pet projects.

So I have decided to ramp down on those so I do not have to maintain them. If one of the pet projects would eventually need it then GitHub, Gitlab, Bitbucket or the like might be a good fit.

While for some folks this might seem a step backwards I say "Less is more!"

Enjoy!

Trying out SonarQube

Keeping your code neat and tidy is a challenge. If you think that you can keep all the little things that make code readable in your head, well, kudos to you. I cannot. 

But with SonarQube it is quite a bit easier. I installed it to try it out on the Mojarra codebase and I have to say I am impressed. 

I would definitely recommend to give it a try. See http://www.sonarqube.org for more information.

And that is that.

Enjoy!

 

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