https://github.com/jboero/nomados

An experiment after Hashiconf Digital 2020 for building a minimal Linux Nomad agent.
https://github.com/jboero/nomados

Last synced: 3 months ago
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An experiment after Hashiconf Digital 2020 for building a minimal Linux Nomad agent.

• Host: GitHub
• URL: https://github.com/jboero/nomados
• Owner: jboero
• License: mpl-2.0
• Created: 2020-06-25T14:21:43.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2022-10-10T10:55:49.000Z (about 2 years ago)
• Last Synced: 2024-04-26T06:33:42.444Z (7 months ago)
• Language: Shell
• Size: 8.85 MB
• Stars: 115
• Watchers: 14
• Forks: 17
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Nomad Init

An experiment after Hashiconf Digital 2020 for building a minimal Linux Nomad agent. This build has been developed and tested on Fedora 32, and copies some local dependencies into the qcow image during packaging.  Qemu-img must be installed and the nbd kernel module loaded to mount the qcow2 image created during `buildimg.sh`.  Accompanying blog post on Medium: https://medium.com/@boeroboy/nomad-vs-systemd-e0db80d34e8a

Here we attempt to turn HashiCorp's Cloud Operating Model upside down, using Nomad as a foundation to run everything from scratch rather than Terraform to provision first.

![image](https://user-images.githubusercontent.com/7536012/159683583-618a326d-80ab-4d37-8f9a-d54d6fb18635.png)

Source for sdhcp can be found here: https://git.2f30.org/sdhcp/.  

Source for Linux kernel built directly:

```

git clone --depth=1 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

cd linux

# Some distros require a make allnoconfig first.

make allnoconfig

make kvm_guest.config

make -j

```

Command to run qemu vm:

```

qemu-system-x86_64 -m 2G -smp cpus=4 -nographic \

-kernel bzImage-linux58 -append "console=ttyS0 root=/dev/sda" \

-net nic,model=virtio -net bridge,br=virbr0 \

-hda ~/Desktop/nomadinit/nomados.qcow2 --enable-kvm

```

# Running in Cloud

It's possible to run this in a cloud provided you can get the cloud to regocnize it as bootable media. Using simple EXTLINUX and BIOS may not be enough for some hypervisors requiring UEFI or secure boot.

![image](https://miro.medium.com/max/720/1*Dz6x39NuHnH1leRb6Hp5Og.jpeg)

Nomad is run at boot with config config/init.json.

Jobs can declare services with the "exec" or "raw-exec" task driver with artifacts containing what needs to be run. For example it's easy to declare a system service which downloads Podman and runs it as a daemon on all or some nodes that join the cluster.  Then the Podman driver would be available on all nodes which can successfully download and run Podman -d.

# NomadOS

NomadOS can be built from the Nomad Init project.  It adds the extlinux bootloader and bare minimal OS into a fully-contained QCOW or VMDK for virtualized or cloud compatible image.  It is currently an experimental community project and not supported by HashiCorp.  It can be built on a Linux distribution so long as all dependency paths in the build script are present in the environment.  Note this is not to be confused with NomadBSD which is an unrelated project.  https://nomadbsd.org/