1. 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 …


  2. 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 …


  3. 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 …


  4. 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 …


  5. 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 …


  6. 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 …


  7. Prometheus consul service discovery

    as published a few months ago I worked out a dockerized a jenkins farm where both master as slaves are docker containers working together with services like nexus and such. Next to that setup I've dockerized my home setup where services like pi-hole, home-assistant and others are running as docker containers on a thin client I promoted to my home lab.

    To have an overview about all those containers and the resources they are consuming I pulled in the git repo of Brian Christner which spins up a whole prometheus stack with some exporters and a grafana instance to visualize …


  8. dockerized DNS over HTTPS using pi-hole through cloudflared proxy-dns

    a few months ago I configured a thin client as my home server to replace the previous raspberry pi setup.

    During that migration I moved over all native services within docker containers. One of those services being a pi-hole setup to block ad serving domains on dns level and to have a dns cache within our LAN to gain a bit of speed.

    It has been running ever since without any issue and worked pretty well.

    When cloudflare announced their fast and privacy based DNS resolver I got a bit intrigued by their DNS over HTTPS feature. Especially since our …


  9. NRPE troubleshooting

    When refactoring a check_memory I wrote a few years ago I bumped into the feared

    NRPE: Unable to read output
    

    error message on our nagios instance.

    When looking for a solution I went through most possible debug steps I could think of and which are nicely described by nagios support but didn't found any solution.

    I almost grabbed to some anti depressants when I thought of the thing I always forget about.

    SELINUX

    When crawling through the audit log it became clear I forgot to configure the proper selinux context type for the new script.

    type=PATH msg=audit(1518702310 …

  10. Test ansible playbooks with docker

    recently I started working at a new project where the infra is maintained by ansible. When been asked to write some functionality in a playbook I missed my vagrant puppet setup where I could easily test my puppet code on my local machine.

    Due to my previous project I felt like maybe I could use docker for this purpose on the ansible part. So I looked a bit around and stumbled on the docker-ansible github repository of William Yeh. He already did a great job by creating a docker container with ansible preinstalled for a lot of linux distributions.

    I …


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