BerandaComputers and TechnologyShow HN: faasd tutorial with multipass and cloud-init

Show HN: faasd tutorial with multipass and cloud-init

Get up and running with your own faasd installation on your Mac

multipass from Canonical is like Docker Desktop, but for getting Ubuntu instead of a Docker daemon. It works on MacOS, Linux, and Windows with the same consistent UX. It’s not fully open-source, and uses some proprietary add-ons / binaries, but is free to use.

For Linux using Ubuntu, you can install the packages directly, or use sudo snap install multipass --classic and follow this tutorial. For Raspberry Pi, see my tutorial here.

John McCabe has also tested faasd on Windows with multipass, see his tweet.

Use-case:

Try out faasd in a single command using a cloud-config file to get a VM which has:

  • port 22 for administration and
  • port 8080 for the OpenFaaS REST API.

Example

The above screenshot is from my tweet, feel free to comment there.

It took me about 2-3 minutes to run through everything after installing multipass.

Let’s start the tutorial

curl -sSLO https://raw.githubusercontent.com/openfaas/faasd/master/cloud-config.txt
  • Update the SSH key to match your own, edit cloud-config.txt:

Replace the 2nd line with the contents of ~/.ssh/id_rsa.pub:

ssh_authorized_keys:
  - ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC8Q/aUYUr3P1XKVucnO9mlWxOjJm+K01lHJR90MkHC9zbfTqlp8P7C3J26zKAuzHXOeF+VFxETRr6YedQKW9zp5oP7sN+F2gr/pO7GV3VmOqHMV7uKfyUQfq7H1aVzLfCcI7FwN2Zekv3yB7kj35pbsMa1Za58aF6oHRctZU6UWgXXbRxP+B04DoVU7jTstQ4GMoOCaqYhgPHyjEAS3DW0kkPW6HzsvJHkxvVcVlZ/wNJa1Ie/yGpzOzWIN0Ol0t2QT/RSWOhfzO1A2P0XbPuZ04NmriBonO9zR7T1fMNmmtTuK7WazKjQT3inmYRAqU6pe8wfX8WIWNV7OowUjUsv alex@alexr.local
  • Boot the VM
multipass launch --cloud-init cloud-config.txt  --name faasd
  • Get the VM’s IP and connect with ssh
multipass info faasd
Name:           faasd
State:          Running
IPv4:           192.168.64.14
Release:        Ubuntu 18.04.3 LTS
Image hash:     a720c34066dc (Ubuntu 18.04 LTS)
Load:           0.79 0.19 0.06
Disk usage:     1.1G out of 4.7G
Memory usage:   145.6M out of 985.7M

Set the variable IP:

export IP="192.168.64.14"

You can also try to use jq to get the IP into a variable:

export IP=$(multipass info faasd --format json| jq '.info.faasd.ipv4[0]' | tr -d '"')

Connect to the IP listed:

Log out once you know it works.

  • Let’s capture the authentication password into a file for use with faas-cli
ssh ubuntu@$IP "sudo cat /var/lib/faasd/secrets/basic-auth-password" > basic-auth-password

Try faasd (OpenFaaS)

  • Login from your laptop (the host)
export OPENFAAS_URL=http://$IP:8080
cat basic-auth-password | faas-cli login -s
  • Deploy a function and invoke it
faas-cli store deploy figlet --env write_timeout=1s
echo "faasd" | faas-cli invoke figlet

faas-cli describe figlet

# Run async
curl -i -d "faasd-async" $OPENFAAS_URL/async-function/figlet

# Run async with a callback

curl -i -d "faasd-async" -H "X-Callback-Url: http://some-request-bin.com/path" $OPENFAAS_URL/async-function/figlet

You can also checkout the other store functions: faas-cli store list

  • Try the UI

Head over to the UI from your laptop and remember that your password is in the basic-auth-password file. The username is `admin.:

echo http://$IP:8080
  • Stop/start the instance
  • Delete, if you want to:
multipass delete --purge faasd

You now have a faasd appliance on your Mac. You can also use this cloud-init file with public cloud like AWS or DigitalOcean.

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