Author Archives: Juergen Caris

About Juergen Caris

I am 54yo, MSc(Dist) and BSc in Computer Science, German and working as a Senior Server Engineer for the NHS Lothian. I am responsible for the patient management system, called TrakCare. I am a UNIX/Linux guy, working in this sector for more than 20 years now. I am also interested in robotics, microprocessors, system monitoring, Home automation and programming.

LVM: Howto increase the size of a filesystem on-the-fly

Posted on December 22, 2015 by Juergen Caris

Oops, that is not good 🙁 /dev/mapper/database_vg-db_vol 690G 655G 12K 100% <the SHADOW database filesystem> This happened at 4am. What can you do in case that this happens to you? Praying is always a solution. The better solution is checking … Continue reading →

Posted in Apps, Beginner, Linux | Leave a comment

Copy large files between servers

Posted on September 9, 2015 by Juergen Caris

If you have to copy large files between systems and security is not an issue you could use netcat. Netcat is a tool that has been developed in 1996 but it is still one of the best tools for this … Continue reading →

Posted in Bash, Beginner | Leave a comment

Conditions in BASH scripts Pt. 1

Posted on July 22, 2015 by Juergen Caris

This is just a reminder for myself. Usually I have to look this up in Google whenever I want to use it 🙁 Check if string A contains string B: if [[ $A == *”$B”* ]] then echo We have … Continue reading →

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resize2fs: Bad magic number in super-block while trying to open ….

Posted on June 17, 2015 by Juergen Caris

… or how to resize a file system on CentOS 7. Due to moving my home partition to a new disk I gained some space back from the logical volume home. After deleting it I thought that it would be … Continue reading →

Posted in Beginner, Linux | 50 Comments