1. Plane spotting on a nomad cluster

    Some weeks ago I upgraded my plane spotting setup by moving my antenna to the roof. It was worth every single effort I've made into it. My stats are rocking ever since. Until the corona crisis halted almost every airline to standstill..

    It gave me some time to thinker about my setup, and for some weird coincidence Mike did create a series of docker containers like I was thinking about to implement. I have one pi connected to the USB device which captures the ADB radio signals.

    But in the current situation it also feeds the flightaware service since I …


  2. Httpd semaphores

    Recently we encountered some strange issues with httpd on some of our CentOS 7 machines during my current project.

    Through our pipeline we restart httpd several times which sometimes leads to this error:

    Apache: [error] (28)No space left on device
    

    After some research we found out the semaphores were all being used blocking httpd daemon to restart.

    The list of semaphores can be fetched by issuing

    # ipcs -st
    
    ------ Semaphore Operation/Change Times --------
    semid    owner      last-op                    last-changed
    753664   apache      Not set                    Mon Feb 17 20:20:47 2020
    786433   apache      Not set                    Mon Feb 17 20:20:47 …

  3. Piaware on a nomad cluster

    A couple of years ago I stumbled on the flightaware website and figured out you could capture radio signals from an airplane using a DVB-T dongle which can be bought for about EUR 15.

    As this really triggered me to start monitoring planes above our head I bought myself such a device, hooked it up to a raspberry pi zero, installed the piaware software and started grabbing the messages and pushing the compiled positions through flightaware.

    Through time I managed to upgrade my home lab towards a nomad cluster. So I migrated my piaware setup to a nomad node and …


  4. Nomad ARM cluster

    as I already mentioned a few times before I have some hands on experiences with nomad. A couple of weeks ago I wrote about a local development setup based on nomad.

    Since quite some time I do have a thinclient which is running some docker containers through a docker-compose file I use for personal stuff at home. But this thinclient is suffering from all the containers I'm trying to spin up. While over thinking this issue I did realize I have quite some raspberry pi's laying around and figured I could maybe set up a cluster for those containers.

    Since …


  5. ArchLinux on intel compute stick

    A few months ago we moved into a brand new office which was furnished with a dozen of samsung displays. Unfortunately the basic player included in those displays isn't capable to add a webpage/url as content. Since we've setted up a smashing instance to create dashboards for each team this was a huge bummer.

    While looking for a stable solution many teams brought their own raspberry pi's, chromecasts, airtame devices to at least be able to show something on the displays in the meanwhile.

    Since we already had good experiences with an intel compute stick and an intel NUC …


  6. Nomad local development

    Been using nomad for a few years now at the customer I got the question couple of weeks ago from some colleagues if nomad could be used to replace docker-compose.

    The reason behind the question is mainly to not vendor lock yourself for local development with the whole docker eco system.

    Since I like a certain level of challenge and I do believe it's a valid use case I gave it a try.

    This resulted in a nomad-local-development repository. The 2 major hurdles to take where to use one file like docker-compose.yml and dns resolving between the containers.

    The …


  7. BIOS upgrade lenovo archlinux

    I got some issues with my wired connection lately that the speed wasn't negotiated correctly and it felt back to 10Mb/s as default.

    Did some troubleshooting by eliminating various network devices, restarting them but the results didn't satisfy. Being completely random when and when not auto negotiated.

    Before becoming insane I decided to update the bios of my machine (being a lenovo T460s).

    I did this already in the past and talked about it even on one of our monthly last Friday's at work. So I was quite sure I had something written about it for future reference but …


  8. Archlinux ARM pi zero cups network print server

    Probably like many amongst us the time of the Christmas holidays is perfect to get some IT related stuff back on track. I used to have a print server setup which got broken over time and I didn't found the energy to invest time into fixing it. But the pressure became higher and higher.

    From both my wife and daughter, especially during the holidays where the wife want to use it to print out tickets and the daughter want to print out color plates..

    So during one of the evenings I pulled myself together and installed ArchLinux ARM on a …


  9. Ansible-playbook archlinux upgrade

    Since a few years now I'm a happy Archlinux user. I like their philosophy which was one of the major points why I made the switch back in the days.

    I'm not only using it on my laptop, but do have some devices running at home which are configured with it. From a thin client which I use as a docker node through some raspberry pies running ArchlinuxARM.

    Since Arch is a rolling update distro there are several updates available throughout the day. To keep on top of them I had to log in on all those devices at least …


  10. Prometheus export/import

    bumping into the case where once deployed a full stack application we don't have any direct connection due to no uplink for security reasons.

    So we (you too @Tom) looked into a way to export the prometheus data into a tar.gz which could be transferred and imported into an instance on our local machine.

    After the initial blog post where we created a tar.gz file from the prometheus storage.tsdb.path on the filesystem @roidelapluie pointed me out about the snapshot feature.

    So we did a bit of research and came up with this new procedure.

    First of …


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