Kubernetes Presentation for CZJUG

I had a presentation about kubernetes for CZJUG couple months ago. Here is a video from the presentation. Here are slides:

Kubernetes from Martin Podval

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Git on Windows: MSysGit

I have started to use Git today. I read a lot of discussions that there is no good tool for Windows platform. After forethought I have decided to used TortoiseGit. I also feared of difficult work related with Git as a lot of articles mentioned many instructions. As I already said, I have decided to use TortoiseGit, because I'm used to work with TortoiseSvn, but for start, MSysGit is enought. So this article is about MSysGit, next will be about TortoiseGit.

How to start with MSysgit on local machine?
Download and install Git for WindowsCreate source code directory for your git appRight click the directory at your favorite file browser. Menu should contain item "Git init here". It initializes chosen directory to be git-abled :-)It was your first usage of Git.

Commit data to local Git repository

Now, you can add any file, your first source code, to created directory. If you are prepared to commit any changes to your local git repository, follow next instructions.
Right-click th…

Tomcat 7 remote deployment

I decided to provide automatic deployment of war packaged application using Jenkins and Deployment plugin. The target platform is Amazon with Tomcat 7, see nice set of articles to find out how to setup such environment for free.

Well, there is couple of tutorials but they missing some points so it pushed me to lost one hour of my work.

What I gotFresh installation of Tomcat 7 on remote machine with opened 8080 port on firewallPersonal war file supposed to be deployed
How to push it to tomcat?
1. First of all, there is simple configuration of tomcat users in file tomcat-users.xml - it was my pain in the ass :-) As original comprehensive documentation says, it's necessary to define user, but which one(s)?

Here is working example of tomcat-users.xml:

<tomcat-users>
<user username="manager-gui" password="changeit" roles="manager-gui"/>
<user username="manager-script" password="changeit" roles="manager-script"/>
…

Java, Docker, Spring boot ... and signals

I spend last couple weeks working on java apps running within docker containers deployed on clustered CoreOS machines. It's pretty simple to run java app within a docker container. You just have to choose a base image for your app and write a docker file.

Note that docker registry contains many java distributions usually based on open jdk. We use our internal image for Oracle's Java 8, build on top of something like this docker file. Once you make a decision whether oracle or openjdk, you can start to write your own docker file.

FROM dockerfile/java:oracle-java8
ADD your.jar /opt/your-app
ADD /dependencies /opt/your-app/dependency
WORKDIR /opt/your-app
CMD ["java -jar /opt/your-app/your.jar"]
However, your app would probably require some parameters. Therefore, last line usually calls your shell script. Such script than validates number and format of those parameters among other things. This is also useful during the development phase because none of us want to build …

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