Category: How to

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Jenkins Docker Revisit

After my initial jenkins setup, I thought my system would be good to go for a long time, however I encountered a problem with permissions after my docker cluster reboot. After all my nodes were back up, and jenkins was running, it could no longer access the docker.sock that it used to handle building and pushing containers. I tried a few things, rebuilding the container, updating it, changing some groups, and found quite a few threads on the topic. Some people had chmod’d the docker.sock to 777 (BAD) or had given jenkins root (ALSO BAD). I ended up finding the solution in using a specific entrypoint script that would determine the group to add to the jenkins user, then launch jenkins using the jenkins user from root.

Most of my additions are from sudo-bmitch’s jenkins-docker repository on GitHub. These include the dockerfile changes and the entrypoint.sh script (as well as the healthcheck mentioned later on).

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Docker Cluster Reboot

Due to unforeseen events, I ended up having to shutdown all of my servers. Due to this, my docker VM cluster ended up getting its first chance to reboot the entire stack of all nodes. This ended up showing some problems in my configuration sadly, as well as a docker issue I had previously encountered in my raspberry pi cluster.

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Home Assistant Supervised

I was originally running a home assistant VM using a script that loaded HASS into proxmox, however the HASS.io image didn’t have the tooling that I like having on a machine for general management of the system. I started researching and took a few turns around to find the right installation script, but I did and included the commands below. The following shell commands and script install Home Assistant Supervised on a general X86 machine. This worked fine on Ubuntu 18.04 LTS.

sudo su
apt-get install -y software-properties-common apparmor-utils apt-transport-https avahi-daemon ca-certificates curl dbus jq network-manager socat

systemctl disable ModemManager
systemctl stop ModemManager

curl -fsSL get.docker.com | sh

curl -sL "https://raw.githubusercontent.com/Kanga-Who/home-assistant/master/supervised-installer.sh" | bash -s -- -m qemux86-64

The default port for HASS is 8123, so go to the server IP:8123 to finish configuration. This will give you all the benefits of the HASSio images for raspberry pi and intel nucs but with your own preferred operating system rather than using the build thats included with the home assistant built images (which are very limited).

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Virtualized Docker Swarm

Why

Why not? In reality, I always wanted to play with clustering, originally with proxmox and ceph, but I never had enough hardware to do so. I do however have a proxmox node with enough ram that I can host multiple lightweight nodes.

Docker swarm is lightweight enough that I can virtualize the entire cluster on my single proxmox host. While this isn’t fault tolerant like a cluster across multiple nodes, it does mean I can reboot cluster nodes for kernel updates and maintain my uptime. I also am able to add additional docker swarm nodes on separate hardware if I get additional hardware, and there is the benefit of having the cluster load balance itself for which software is running on which node.

Benefits

Each node in the cluster is identical, each can be replaced by following the exact same process and while I don’t have automated deployment of new nodes, they are still closer to cattle than many of my other virtual machines. Due to the goal of replicated storage between the nodes, I should also be able to take a single node and rebuild the entire cluster if needed, since it would have the entire clusters configuration.

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IRC Botnet and Jenkins

I wrote a number of IRC bots a number of years ago, hosting them on my infrastructure. Since building a 3 node docker swarm, I decided that these would be good candidates to use in learning Jenkins for both auto building the software, and building containers. I hadn’t made my own dockerfiles before, nor had I setup proper builds outside of my IDE for these bots before.

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Sqlite Resolution on UnRaid

Like many, I had issues with sqlite database corruption on Unraid. I found while researching it that it had to do with file locks in the fuse file system unraid uses to merge disks. I found the best way to circumvent this is to use the cache disk for those databases and map them directly. My docker mappings now point to /mnt/cache/share instead of going /mnt/user/share. This solved the issue better than the 6.8.0rc5 fixes. This avoids the system in question completely and solved the stability issues for me.

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NextCloud Setup: Joplin

Joplin was relatively simple to setup on NextCloud. The only difficulty is setting the folder it should run out of. This is done via the webdav url that Joplin connects to. An example is shown below on how to get this going.

https://nextcloud.rapternet.us/remote.php/dav/files/<username>/<path to Joplin directory>

The webdav url just needs your username and the path it should utilize, in my case I just have Joplin setup to go to Documents/Joplin. This would go in the tag above, just add a username and it’s done. This does have to be setup the same way on all Joplin clients or you will end up with files missing from one or another, though they will all be in NextCloud.

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NextCloud Setup: Desktop Client

Setup is easy enough IF http does not redirect to https. The authentication mechanism for the NextCloud desktop client for some reason doesn’t work when http is redirected to https (ex: in the way let’s encrypt sets it up). With the right server setup after that, everything is straight forward.

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Installing OctoPi on an RPi

3D printers have come a long ways in the past few years. The prices have plummeted for basic units, allowing anyone to buy them. The raspberry pi can be setup alongside a basic 3D printer to enable some amazing functionality. They can allow remote control, management, and monitoring of the printers. When combined with a pi cam, you can even create time lapses of the prints.  To do this, we will be running OctoPi on the raspberry pi.

OctoPi is a Raspberry Pi distribution for 3d printers. Out of the box it includes:

  • theOctoPrint host software including all its dependencies and preconfigured with webcam and slicing support,
  • mjpg-streamer for live viewing of prints and timelapse video creation with support for USB webcams and the Raspberry Pi camera,
  • CuraEngine 15.04 for direct slicing on your Raspberry Pi and
  • the LCD app OctoPiPanel plus various scripts to configure supported displays

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Installing MotionEyeOS on an RPi

Raspberry Pis are neat little computers that can be placed just about anywhere assuming there is power and network connectivity nearby. These were made even more convenient with the addition of built in Wi-Fi on the Raspberry Pi 3. One application of these small devices is for home security, as a small motion sensing webcam that can record 24/7, or only when there is motion detected.

There are ways to build up your own system using the basic raspbian distribution and various software packages, or you can use a custom built operating system for this purpose, MotionEyeOS.

MotionEyeOS has everything needed to run a security camera system, or simply a remote webcam monitoring system. This will cover setting up a camera in this tutorial for basic recording and monitoring. This will let us spy on our dog while away at work. Continue reading “Installing MotionEyeOS on an RPi”

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