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For deb based distributions like Debian, Ubuntu, it is advisable to purge old packages (have status rc, r=removed, c=config).

Kibana is the visual web interface for elasticsearch. You can create searches, visualisations and dashboards. Sometimes you spend a lot of valuable work into them. Therefore is essential to have some kind of backup for Kibana. The Kibana data itself, is stored in Elasticsearch in the .kibana index. One way is to use the snapshot and restore capability of Elasticsearch.

To purge all data from a user schema, I simply generate a drop table statement for each user table.

I have to deal with a German software vendor, which gives us some SQLs scripts for Oracle DB. Between Germany and Switzerland, there are minor differences, which led to error ORA-01830. The script contained some insert statements with timestamps.

An Java application uses log4j. Since I use logback all the time, it was quite a challenge to look up the docs for log4j 1.2.17. This application also writes statistical logs. To separate the statistic, we can use a different appender in log4j. The crucial point is to set the additivity to false, so the log won’t be logged twice in the root logger.

I needed to backup my data, rsync is the right tool for that. But since it has so many options, I look out for a graphical user interface, that could set up my settings. I found it at grsync.

I am more than satisfied with my Macbook Pro, but I am still quite fond of working with Linux. I saw a cheap opportunity, and assembled a nice micro barebone. Runs perfectly. The Intel NUC need only RAM and disk storage. I chose the NUC6I5SYH, thus it offers me to use a fast NAND storage for the OS (M.2 22x80) and a 1 TB Fusion drive for storage.

Every three months, security compliance requires to change the password. This also applies for the proxy authentication. If you have a bunch of tools, like Eclipse, IntelliJ or any other applications that needs proxy auth for updates and access, it can be a hassle to change the settings in all applications. For Windows, cntlm is a relief. It stands between your applications and the corporate proxy, adding NTLM authentication on-the-fly. So basically you change the auth data only for cntlm, and all other applications using it to bypass the proxy.

If you have JBoss EAP or Wildfly and you are using Java 8, you will receive in the logs, this warning: