Running Jenkins stages depending on the pipeline status

There are scenarios in which it’s useful to enable or disable stages in a Jenkins pipeline depending on the build status. This is about having different stages in a Jenkinsfile that will be executed depending on the `buildResult` and `stageResult` of the Jenkins pipeline and the different stages inside the Jenkins pipeline. Continue reading

Restarting cloudfoundry apps without downtime

When running an application on Cloudfoundry it’s possible to start multiple instances of an application. This might be for performance reasons, but also by means of reliability. When restarting an application the default behaviour is first stopping all instances of an application and the starting them again. This results in a small downtime when there is no running instance available. Let’s see how to improve this approach. Continue reading

Tunneling socks via http/s

Nowadays many govermental authorities or network administrators think that blocking all the network traffic for security reasons is a good idea. One common approach is to block everything, but allow some traffic that is whitelisted. Thus it is not possible to do all the interesting stuff that the firewall prevents to do. But by blocking http or https no webserver would be available any more. So normally these ports are open and thus this is the way to go. Continue reading

Determining content type with Apache Tika

About Apache Tika

The project is hosted by the Apache Software Foundation. It supports detecting various file and content types. There is a full list of supported formats. When having a look at the list that displays the supported formats, many document formats are listed in there. E.g. text/plain, text/xml, the propritary Microsoft OOXML or the office standard Open Document. Furthermore images (image/gif, image/jpeg, image/bmp or image/tiff), videos (video/avi, video/mpgeg or video/mp4) and audios (audi/ogg, audio/x-wav or audio/mpeg) can be recognized by Tika. Even feeds (application/rss+xml, application/atom+xml) may be recognized. And many, many more … Continue reading

How to debug encrypted HTTP traffic

When developing software, sometime it’s necessary to sniff the traffic that is transmitted between two computer systems. For that purpose tools like wireshark or tcpdump may be useful. Wireshark is a great tool, but when handling encrypted connections it is not possible to decrypt the traffic without having the key used for encryption. When sniffing http traffic the private key of the certificate is required to decrypt the information. But when talking to a foreign server, without having its private key another approach is necessary. Continue reading