### Install OpenFaaS Edge with Custom DNS and Remote Registry

Source: https://docs.openfaas.com/edge/airgap

Example installation command for OpenFaaS Edge, using a custom DNS server and assuming a remote registry is available.

```bash
sudo /usr/local/bin/faasd install \
  --dns-server 10.0.0.1

```

--------------------------------

### Install OpenFaaS Edge with Custom DNS and Pull Policy

Source: https://docs.openfaas.com/edge/airgap

Example installation command for OpenFaaS Edge on an air-gapped system, specifying a custom DNS server and a pull policy for images restored to the containerd library.

```bash
sudo /usr/local/bin/faasd install \
  --dns-server 127.0.0.53 \
  --pull-policy=IfNotPresent

```

--------------------------------

### Go Module Dependency Example

Source: https://docs.openfaas.com/languages/go

Shows how a Go module's dependency is recorded in the go.mod file after running `go get`. This example includes an indirect dependency.

```go
module handler/function

go 1.18

require golang.org/x/crypto v0.13.0 // indirect


```

--------------------------------

### Get Help for faas-cli build

Source: https://docs.openfaas.com/cli/build

Run this command to view all available options and examples for the `faas-cli build` command.

```bash
faas-cli build --help

```

--------------------------------

### Install apache2-utils or httpd-tools

Source: https://docs.openfaas.com/edge/builder

Install the necessary utility for creating password files. Use apt for Debian-based systems and dnf for RHEL-based systems.

```bash
# On Debian run:
sudo apt install apache2-utils

# On RHEL run:
sudo dnf install httpd-tools

```

--------------------------------

### Install QEMU User Static

Source: https://docs.openfaas.com/cli/build

Install QEMU utilities to enable cross-compilation for ARM architectures. This command should be run on your local machine, not on the faasd instance.

```bash
docker run --rm --privileged \
  multiarch/qemu-user-static \
  --reset -p yes

```

--------------------------------

### Install cron-connector with arkade

Source: https://docs.openfaas.com/reference/cron

Use arkade for a quick installation of the cron-connector during development or testing. Set 'openfaasPro=true' for OpenFaaS Pro deployments.

```bash
arkade install cron-connector

```

```bash
arkade install cron-connector \
  --set openfaasPro=true

```

--------------------------------

### Install PHP extensions with custom script

Source: https://docs.openfaas.com/languages/php

Customize the PHP function image by adding or compiling extensions using the `php-extension.sh` script. This example shows how to install `pdo_mysql` and compile the Phalcon extension.

```bash
#!/bin/sh

echo "Installing PHP extensions"
docker-php-ext-install pdo_mysql

# Install Phalcon
PHALCON_VERSION=3.4.0
PHALCON_EXT_PATH=php7/64bits

set -xe && \
        # Compile Phalcon
        curl -LO https://github.com/phalcon/cphalcon/archive/v${PHALCON_VERSION}.tar.gz && \
        tar xzf ${PWD}/v${PHALCON_VERSION}.tar.gz && \
        docker-php-ext-install -j $(getconf _NPROCESSORS_ONLN) ${PWD}/cphalcon-${PHALCON_VERSION}/build/${PHALCON_EXT_PATH} && \
        # Remove all temp files
        rm -r \
            ${PWD}/v${PHALCON_VERSION}.tar.gz \
            ${PWD}/cphalcon-${PHALCON_VERSION}


```

--------------------------------

### Download and install arkade

Source: https://docs.openfaas.com/tutorials/local-kind-registry

Use these commands to download and install the arkade CLI tool. You can choose to install it manually or with sudo privileges.

```bash
# Download only, install yourself with sudo
$ curl -sLS https://get.arkade.dev | sh
```

```bash
# Download and install
$ curl -sLS https://get.arkade.dev | sudo sh
```

--------------------------------

### Install CA Certificates during Build

Source: https://docs.openfaas.com/reference/yaml

This example demonstrates how to include `ca-certificates` as a build option in your stack.yml file. This ensures that the necessary certificates are installed in the Docker image, which can be crucial for making secure network requests from your function.

```yaml
build_options:
- ca-certificates

```

--------------------------------

### Install arkade

Source: https://docs.openfaas.com/cli/install

Use this command to install arkade, a tool for easily installing DevOps and Kubernetes tools.

```bash
curl -sSL https://get.arkade.dev | sudo -E sh

```

--------------------------------

### Install OpenFaaS with Arkade

Source: https://docs.openfaas.com/tutorials/local-kind-registry

Install OpenFaaS Pro using arkade, providing a license file for enterprise features. Ensure your license is located at ~/.openfaas/LICENSE.

```bash
$ arkade install openfaas --license-file ~/.openfaas/LICENSE
```

--------------------------------

### Connect to PostgreSQL

Source: https://docs.openfaas.com/openfaas-pro/postgres-events

Connect to your PostgreSQL instance using `psql` to test the setup.

```bash
PGPASSWORD=passwd psql -U postgres -h 127.0.0.1
```

--------------------------------

### Install Downloaded RPM Dependencies

Source: https://docs.openfaas.com/edge/airgap

Install the previously downloaded RPM packages and their dependencies on the air-gapped machine.

```bash
sudo dnf install --disablerepo="*" ./rpm/*.rpm

```

--------------------------------

### Download RHEL-like Installation Bundle

Source: https://docs.openfaas.com/edge/airgap

Use arkade to download the OpenFaaS Edge RPM installation bundle to the current directory.

```bash
arkade oci install --path . ghcr.io/openfaasltd/faasd-pro-rpm:latest

```

--------------------------------

### Install OpenFaaS Edge with gVisor

Source: https://docs.openfaas.com/edge/gvisor

Use this command during a new OpenFaaS Edge installation to enable the gVisor runtime.

```bash
faasd install --gvisor

```

--------------------------------

### Install OpenFaaS Edge with Custom DNS

Source: https://docs.openfaas.com/edge/airgap

Install OpenFaaS Edge, specifying a custom DNS server using the --dns-server flag.

```bash
sudo faasd install --dns-server 127.0.0.53

```

--------------------------------

### Install Caddy with arkade

Source: https://docs.openfaas.com/edge/tls

Installs Caddy using the arkade package manager. Ensure you have arkade installed first.

```bash
curl -sLS https://get.arkade.dev | sudo sh
arkade system install caddy
```

--------------------------------

### Create and start KinD cluster

Source: https://docs.openfaas.com/tutorials/local-kind-ingress

Create a KinD cluster named 'openfaas' using the specified configuration file.

```bash
kind create cluster --name openfaas --config kind-config.yaml
```

--------------------------------

### Deploy Function (Example)

Source: https://docs.openfaas.com/reference/rest-api

This example shows how to deploy a function using the `faas-cli` which interacts with the REST API. It demonstrates passing the namespace in the request body for a PUT operation.

```APIDOC
## PUT /system/functions

### Description
Deploys or updates a function. This example uses `faas-cli` to illustrate the process, showing namespace handling in the request body.

### Method
PUT

### Endpoint
/system/functions

### Parameters
#### Request Body
- **service** (string) - Required - The name of the function service.
- **image** (string) - Required - The Docker image for the function.
- **namespace** (string) - Required - The namespace to deploy the function into.
- **envProcess** (string) - Optional - The command to run as the process.
- **labels** (object) - Optional - Key-value pairs for function labels.
- **annotations** (object) - Optional - Key-value pairs for function annotations.

### Request Example
```bash
FAAS_DEBUG=1 faas-cli store deploy -n alex figlet
PUT http://127.0.0.1:8080/system/functions
Content-Type: [application/json]
{"service":"figlet","image":"ghcr.io/openfaas/figlet:latest","namespace":"alex","envProcess":"figlet","labels":{},"annotations":{}}
```

### Response
#### Success Response (200)
Indicates successful deployment or update of the function.
```

--------------------------------

### Install kubectl using arkade

Source: https://docs.openfaas.com/tutorials/local-kind-registry

Installs the kubectl command-line tool, which is used to interact with your Kubernetes cluster.

```bash
$ arkade get kubectl
```

--------------------------------

### Install OpenFaaS CE with arkade

Source: https://docs.openfaas.com/deployment/kubernetes

Use arkade to quickly install the Community Edition of OpenFaaS. This is the recommended method for most users.

```bash
curl -SLsf https://get.arkade.dev/ | sh
arkade install openfaas-ce
```

--------------------------------

### Install airfaas CLI plugin

Source: https://docs.openfaas.com/openfaas-pro/airgap

Installs the airfaas CLI plugin. This is a prerequisite for using airfaas commands.

```bash
faas-cli plugin get airfaas
```

--------------------------------

### Perform Final OpenFaaS Edge Installation

Source: https://docs.openfaas.com/edge/airgap

Execute the final installation command for OpenFaaS Edge.

```bash
sudo -E faasd install

```

--------------------------------

### Example: Scaling up with target proportion

Source: https://docs.openfaas.com/architecture/autoscaling

Demonstrates how the autoscaler calculates the number of desired replicas when the total load is high and a target proportion is used. This example shows scaling from 1 to 2 replicas.

```plaintext
total load = 90
mean per pod = 90 / 1 = 90

2 =  ceil( 1 * ( 90 / ( 100 * 0.7 ) ) )
```

--------------------------------

### Install faas-cli with Bash (non-root)

Source: https://docs.openfaas.com/cli/install

Download the faas-cli binary into the current directory without root privileges. Installation instructions will be printed after download.

```bash
curl -sSL https://cli.openfaas.com | sh

```

--------------------------------

### Install OpenFaaS Edge on Debian-based Systems

Source: https://docs.openfaas.com/edge/airgap

Install the OpenFaaS Edge package using dpkg after transferring the .deb file to the air-gapped machine.

```bash
sudo dpkg -i ./openfaas-edge-*-amd64.deb

```

--------------------------------

### Example Standard Log Output

Source: https://docs.openfaas.com/cli/logs

An example of a log entry from the `nodeinfo` function, showing the standard format with a timestamp, function name, instance ID, and message.

```text
2019-07-21 07:57:14.437219758 +0000 UTC nodeinfo (nodeinfo-867cc95845-p9882) 2019/07/21 07:57:14 Wrote 92 Bytes - Duration: 0.121959 seconds

```

--------------------------------

### Download Debian Installation Bundle

Source: https://docs.openfaas.com/edge/airgap

Use arkade to download the OpenFaaS Edge Debian installation bundle to the current directory.

```bash
arkade oci install --path . ghcr.io/openfaasltd/faasd-pro-debian:latest

```

--------------------------------

### Install WSL Utility for Browser Redirection

Source: https://docs.openfaas.com/openfaas-pro/sso/cli

For WSL users, install the `wslu` package to enable browser redirection. This ensures that authentication prompts open on your Windows host and results return to WSL.

```bash
sudo apt update -qy && sudo apt install -qy wslu --no-install-recommends

```

--------------------------------

### Example: Load distribution after scaling

Source: https://docs.openfaas.com/architecture/autoscaling

Shows how the load is distributed across replicas after scaling up and how the autoscaler re-evaluates the desired number of replicas. This example demonstrates the load per pod decreasing.

```plaintext
mean per pod = 25 / 3 = 8.33

5 =  ceil( 3 * ( 8.33 / 5 * 1 ) )
```

--------------------------------

### Install OpenFaaS with ClusterRole

Source: https://docs.openfaas.com/reference/namespaces

Install OpenFaaS with the necessary ClusterRole permissions to manage multiple namespaces. This is a prerequisite for enabling the multi-namespace feature.

```bash
arkade install openfaas --clusterrole

```

--------------------------------

### Install OpenFaaS Edge (faasd-pro)

Source: https://docs.openfaas.com/deployment/edge

Installs the OpenFaaS Edge (faasd-pro) commercial distribution using a utility script. This script fetches the latest version and makes it executable.

```bash
curl -sLSf \
    https://raw.githubusercontent.com/openfaas/faasd/refs/heads/master/hack/install-edge.sh \
    -o install-edge.sh && \
    chmod +x install-edge.sh

sudo -E ./install-edge.sh
```

--------------------------------

### Install airfaas CLI plugin

Source: https://docs.openfaas.com/edge/airgap

Download the `airfaas` CLI plugin to assist with image management for air-gapped environments.

```bash
faas-cli plugin get airfaas

```

--------------------------------

### Example: Scaling up based on load

Source: https://docs.openfaas.com/architecture/autoscaling

Illustrates the calculation for scaling up a function when the current load exceeds the target load. This example shows scaling from 1 to 3 replicas.

```plaintext
mean per pod = 15 / 1

3 = ceil ( 1 * ( 15 / 5 * 1 ) )
```

--------------------------------

### SQL for PostgreSQL Example

Source: https://docs.openfaas.com/languages/python

SQL commands to create a database and table, and insert initial data for testing PostgreSQL integration.

```sql
CREATE DATABASE main;

\c main;

CREATE TABLE users (
    name TEXT,
);

-- Insert the original Postgresql author's name into the test table:

INSERT INTO users (name) VALUES ('Michael Stonebraker');

```

--------------------------------

### Install arkade for MacOS/Linux

Source: https://docs.openfaas.com/deployment/kubernetes

Installs the arkade CLI tool, which is recommended for deploying OpenFaaS and other related software to Kubernetes. This command is for MacOS and Linux systems.

```bash
# For MacOS / Linux:
curl -SLsf https://get.arkade.dev/ | sudo sh
```

--------------------------------

### List Available Templates

Source: https://docs.openfaas.com/cli/templates

Use this command to view all available templates in the default store. It shows template names, whether they are recommended, and a brief description.

```bash
$ faas-cli template store list

NAME                     RECOMMENDED DESCRIPTION        SOURCE
bash-streaming           [x]         openfaas-incubator Bash Streaming template
dockerfile               [x]         openfaas           Classic Dockerfile template
dotnet8-csharp           [x]         openfaas           C# template using WebApplication
golang-middleware        [x]         openfaas           HTTP middleware interface in Go
java11-vert-x            [x]         openfaas           Java 11 Vert.x template
node22                   [x]         openfaas           HTTP-based Node 22 template
php8                     [x]         openfaas           Classic PHP 8 template
python3-http             [x]         openfaas           Python 3 with Flask and HTTP
python3-http-debian      [x]         openfaas           Python 3 with Flask and HTTP based on Debian
ruby-http                [x]         openfaas           Ruby 2.4 HTTP template


```

--------------------------------

### List Functions in a Specific Namespace (GET)

Source: https://docs.openfaas.com/reference/rest-api

When using OpenFaaS for Enterprises, you can specify a namespace for GET operations using the `namespace` query parameter. This example lists functions in the 'alex' namespace.

```bash
FAAS_DEBUG=1 faas-cli list -n alex
GET http://127.0.0.1:8080/system/functions?namespace=alex

```

--------------------------------

### Install NATS CLI using Arkade

Source: https://docs.openfaas.com/openfaas-pro/jetstream

Install the NATS command-line interface tool. This tool is required for managing NATS streams, including deleting them to reset queues.

```bash
arkade get nats

```

--------------------------------

### Install npm packages for Node.js function

Source: https://docs.openfaas.com/languages/node

To add external dependencies like `axios` to your Node.js function, navigate to the function's directory and use `npm install --save`. This example shows installing `axios` after creating a new function named 'http-req'.

```bash
faas-cli new --lang node22 http-req
cd http-req

npm install --save axios

```

--------------------------------

### Example Builder API Response with Duration

Source: https://docs.openfaas.com/openfaas-pro/builder

An example of a successful build response from the OpenFaaS builder API, including build logs, the image name, and the total duration in seconds.

```json
{
    "log": [
        "2022-06-23T09:10:12Z [ship 15/16] RUN npm test 0.35s",
        "2022-06-23T09:10:13Z [ship 16/16] WORKDIR /home/app/",
        "2022-06-23T09:10:13Z [ship 16/16] WORKDIR /home/app/ 0.09s",
        "2022-06-23T09:10:13Z exporting to image",
        "2022-06-23T09:11:06Z pushing manifest for ttl.sh/openfaas-image:1h@sha256:b077f553245c09d789980d081d33d46b93a23c24a5ec0a9c3c26be2c768db93e 0",
        "2022-06-23T09:11:09Z pushing manifest for ttl.sh/openfaas-image:1h@sha256:b077f553245c09d789980d081d33d46b93a23c24a5ec0a9c3c26be2c768db93e 0",
        "2022-06-23T09:10:13Z exporting to image 5.18s"
    ],
    "image": "ttl.sh/openfaas-image:1h",
    "status": "success",
    "duration": 0.843
}
```

--------------------------------

### Install faasd CE

Source: https://docs.openfaas.com/deployment/edge

Clone the faasd repository and run the installation script to set up faasd CE for non-commercial use. This method is suitable for individuals and requires a stable internet connection.

```bash
git clone https://github.com/openfaas/faasd --depth=1
cd faasd

./hack/install.sh
```

--------------------------------

### Create Example Function with Scale to Zero

Source: https://docs.openfaas.com/openfaas-pro/scale-to-zero

Create a new OpenFaaS function using the golang-middleware template and configure it to scale to zero with a specified duration.

```bash
export OPENFAAS_PREFIX=ttl.sh/daily-job:1h
faas-cli new --lang golang-middleware daily-job

```

--------------------------------

### Get OpenFaaS Info

Source: https://docs.openfaas.com/deployment/kubernetes

Retrieves information about your OpenFaaS installation using arkade. This command is useful for checking the status and configuration.

```bash
arkade info openfaas
```

--------------------------------

### Get faas-cli and Port-Forward Gateway

Source: https://docs.openfaas.com/deployment/kubernetes

Installs the faas-cli and sets up a port-forward to the OpenFaaS gateway. This is useful for interacting with your OpenFaaS deployment locally.

```bash
arkade get faas-cli
kubectl rollout status -n openfaas deploy/gateway
kubectl port-forward -n openfaas svc/gateway 8080:8080 &
```

--------------------------------

### GitLab CI/CD Pipeline for OpenFaaS Deployment

Source: https://docs.openfaas.com/openfaas-pro/iam/gitlab-federation

Example `.gitlab-ci.yml` to deploy to OpenFaaS. It obtains an ID token, installs the `faas-cli pro` plugin, and authenticates to the OpenFaaS gateway.

```yaml
stages:
  - build

services:
  - docker:dind

cache:
  key: ${CI_COMMIT_REF_SLUG} # i.e. master
  paths:
  - ./faas-cli
  - ./template

build_job:
  stage: build
  image: docker:latest
  variables:
    OPENFAAS_URL: https://gw.example.com

  script:
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
    - apk add --no-cache git curl
    - if [ -f "./faas-cli" ] ; then cp ./faas-cli /usr/local/bin/faas-cli || 0 ; fi
    - if [ ! -f "/usr/local/bin/faas-cli" ] ; then apk add --no-cache curl git && curl -sSL https://cli.openfaas.com | sh && chmod +x /usr/local/bin/faas-cli && cp /usr/local/bin/faas-cli ./faas-cli ; fi

    - faas-cli plugin get pro

    - faas-cli pro auth --token=$ID_TOKEN_1

    - faas-cli list -n dev
    - faas-cli ns
    - faas-cli store deploy -n dev printer --name p1

  id_tokens:
    ID_TOKEN_1:
      aud: https://gw.example.com

```

--------------------------------

### List Functions (Basic Auth)

Source: https://docs.openfaas.com/reference/rest-api

This example demonstrates how to list all functions using basic authentication with the root user account.

```APIDOC
## GET /system/functions

### Description
Lists all deployed functions in the OpenFaaS system.

### Method
GET

### Endpoint
/system/functions

### Parameters
#### Query Parameters
- **namespace** (string) - Optional - The namespace to list functions from.

### Request Example
```bash
export HOST="127.0.0.1:8080"
export PASSWORD=""

curl -s \
    http://admin:$PASSWORD@$HOST/system/functions
```

### Response
#### Success Response (200)
- **functions** (array) - A list of function objects.
- **name** (string) - The name of the function.
- **image** (string) - The Docker image used by the function.
- **invocation_url** (string) - The URL to invoke the function.
- **handler** (string) - The handler used by the function.
- **lang** (string) - The language of the function.
- **secrets** (array) - A list of secrets used by the function.
- **environment** (object) - Environment variables for the function.

#### Response Example
```json
[
  {
    "name": "my-function",
    "image": "my-image:latest",
    "invocation_url": "http://127.0.0.1:8080/function/my-function.openfaas-fn",
    "handler": "my-handler",
    "lang": "python3",
    "secrets": [],
    "environment": {}
  }
]
```
```

--------------------------------

### Local Testing Setup for Authenticated Functions

Source: https://docs.openfaas.com/languages/node

Sets up the local environment to test an authenticated function by copying the secret token to the expected directory. Use `faas-cli local-run` to start the function locally.

```bash
mkdir -p .secrets
cp node-fn-token.txt .secrets/node-fn-token

faas-cli local-run -f node-fn.yml
```

--------------------------------

### Enable Pro plugin with GitHub

Source: https://docs.openfaas.com/cli/install

Enable the Pro plugin by authenticating via GitHub. This process opens a browser for device challenge completion.

```bash
faas-cli pro enable

```

--------------------------------

### Install cert-manager

Source: https://docs.openfaas.com/reference/tls-openfaas

Installs the cert-manager operator using arkade. Ensure arkade is installed first.

```bash
$ arkade install cert-manager

```

--------------------------------

### Install OpenFaaS Edge RPM Package

Source: https://docs.openfaas.com/edge/airgap

Install the OpenFaaS Edge RPM package after all its dependencies have been installed.

```bash
sudo dnf install openfaas-edge-*.rpm

```

--------------------------------

### List Available Templates

Source: https://docs.openfaas.com/languages/custom

Run this command to view the templates available in the current directory. This helps in selecting the correct language/framework for your function.

```bash
faas-cli new --list
```

--------------------------------

### Configure Caddyfile for OpenFaaS Gateway

Source: https://docs.openfaas.com/edge/tls

Sets up Caddy to proxy traffic to the OpenFaaS gateway. Replace example.com with your domain.

```plaintext
{
  email example.com


gateway.example.com {
  reverse_proxy localhost:8080
}


```

--------------------------------

### Execute the KinD cluster creation script

Source: https://docs.openfaas.com/tutorials/local-kind-registry

Make the cluster creation script executable and then run it to provision your KinD cluster with a local registry.

```bash
$ chmod +x ./kind-with-registry.sh
$ ./kind-with-registry.sh
```

--------------------------------

### Install OpenFaaS Edge RPM Package

Source: https://docs.openfaas.com/deployment/edge

Installs OpenFaaS Edge on RHEL-like systems using an RPM package. First, the package is downloaded using `arkade oci install`, then installed with `dnf`.

```bash
arkade oci install --path . ghcr.io/openfaasltd/faasd-pro-rpm:latest
```

```bash
sudo dnf install openfaas-edge-*.rpm
```

--------------------------------

### List All Templates from Store

Source: https://docs.openfaas.com/languages/custom

Execute this command to see all available templates, including community-contributed ones, from the OpenFaaS template store. Note that community templates may require due diligence for maintenance status.

```bash
faas-cli template store list
```

--------------------------------

### Build and Run a Go Function Locally

Source: https://docs.openfaas.com/deployment/troubleshooting

Create, build, and run a Go function locally for testing purposes. This example demonstrates using `faas-cli` to create a new function, build it, and then run it using Docker.

```bash
faas-cli new --lang golang-middleware test-this

faas-cli build -f test-this.yml

docker run -p 8081:8080 \
  --rm \
  --name test-this \
  -ti test-this:latest

```

--------------------------------

### Install Required Packages on RHEL-like Systems

Source: https://docs.openfaas.com/edge/airgap

Ensure runc and iptables-services are installed on RHEL-like systems before installing OpenFaaS Edge.

```bash
sudo dnf install runc iptables-services

```

--------------------------------

### Example of Function Handler Folder Structure

Source: https://docs.openfaas.com/reference/yaml

Illustrates the directory structure of a function's build folder after including common, data, and models directories via the 'copy' configuration.

```text
build
└── hello
    ├── Dockerfile
    ├── function
    │   ├── __init__.py
    │   │   └── ...
    │   ├── models
    │   │   └── ...
    │   ├── data
    │   │   └── ...
    │   ├── common
    │   │   └── ...
    │   ├── handler.py
    │   └── requirements.txt
    ├── index.py
    ├── requirements.txt
    └── template.yml
```

--------------------------------

### Deploy and List Functions

Source: https://docs.openfaas.com/deployment/kubernetes

Deploys the 'nodeinfo' function from the store and lists all deployed functions. This is a quick way to test your OpenFaaS setup.

```bash
faas-cli store deploy nodeinfo
faas-cli list
```

--------------------------------

### Install Required Packages on Debian-based Systems

Source: https://docs.openfaas.com/edge/airgap

Ensure essential packages like runc, bridge-utils, and iptables are installed before proceeding with the OpenFaaS Edge installation on Debian-based systems.

```bash
sudo apt update && \
  sudo apt install runc bridge-utils iptables iptables-persistent

```

--------------------------------

### Install Profile CRD for OpenFaaS on Kubernetes

Source: https://docs.openfaas.com/reference/profiles

Apply this YAML to install the Custom Resource Definition (CRD) for Profiles when installing OpenFaaS on Kubernetes, if not handled automatically by the Helm chart.

```yaml
# This is a placeholder for the actual YAML content of the CRD.
# The actual CRD definition would be provided in the OpenFaaS documentation.
# Example structure:
# apiVersion: apiextensions.k8s.io/v1
# kind: CustomResourceDefinition
# metadata:
#   name: profiles.openfaas.com
# spec:
#   group: openfaas.com
#   versions:
#     - name: v1alpha1
#       served: true
#       storage: true
#   scope: Namespaced
#   names:
#     plural: profiles
#     singular: profile
#     kind: Profile
#     shortNames:
#       - prof

```

--------------------------------

### Install faas-cli with Curl

Source: https://docs.openfaas.com/tutorials/first-python-function

Installs the OpenFaaS CLI on Linux or macOS using a curl command.

```bash
$ curl -sSL https://cli.openfaas.com | sudo sh
```

--------------------------------

### OpenFaaS Stack Configuration with PostgreSQL

Source: https://docs.openfaas.com/languages/python

Example stack.yml configuration for a function requiring PostgreSQL, including language, handler, image, and build options for 'libpq'.

```yaml
version: 1.0
provider:
  name: openfaas
  gateway: http://127.0.0.1:8080
functions:
  pgfn:
    lang: python3-http-debian
    handler: ./pgfn
    image: pgfn:latest
    build_options:
      - libpq

```

--------------------------------

### Install OpenTelemetry Packages for Node.js

Source: https://docs.openfaas.com/languages/node

Install the necessary OpenTelemetry packages for zero-code instrumentation in your Node.js template.

```bash
npm install --save @opentelemetry/api
npm install --save @opentelemetry/auto-instrumentations-node

```

--------------------------------

### List and Deploy Functions for ARM

Source: https://docs.openfaas.com/deployment/kubernetes

Use these commands to list and deploy functions from the OpenFaaS Function Store, specifying the ARM platform. Ensure OPENFAAS_URL is set.

```bash
export OPENFAAS_URL=http://IP:8080/

faas-cli store list --platform armhf
faas-cli store deploy NAME --platform armhf
```

```bash
export OPENFAAS_URL=http://IP:8080/

faas-cli store list --platform arm64
faas-cli store deploy NAME --platform arm64
```

--------------------------------

### Install faas-cli with arkade

Source: https://docs.openfaas.com/cli/install

Install the faas-cli using arkade. This command can also be run again to update the CLI.

```bash
arkade get faas-cli

```

--------------------------------

### View OpenFaaS Gateway Logs

Source: https://docs.openfaas.com/deployment/troubleshooting

Check the logs for the `gateway` deployment in the `openfaas` namespace to identify startup errors.

```bash
kubectl logs -n openfaas deploy/gateway
```

--------------------------------

### Example JSON log output

Source: https://docs.openfaas.com/reference/rest-api

This is an example of the JSON formatted log output when requesting logs from a function.

```json
{"name":"env","namespace":"","instance":"env-5b6d68d94c-qqdtj","timestamp":"2023-07-04T16:32:22.223912519Z","text":"2023/07/04 16:32:22 Version: 0.1.4\tSHA: 86e85231a20df03bc9187a31c400f4bbc4e2b9ba\n"}
{"name":"env","namespace":"","instance":"env-5b6d68d94c-qqdtj","timestamp":"2023-07-04T16:32:22.223947899Z","text":"2023/07/04 16:32:22 Timeouts: read: 5s, write: 5s hard: 0s.\n"}
{"name":"env","namespace":"","instance":"env-5b6d68d94c-qqdtj","timestamp":"2023-07-04T16:32:22.223954179Z","text":"2023/07/04 16:32:22 Listening on port: 8080\n"}
{"name":"env","namespace":"","instance":"env-5b6d68d94c-qqdtj","timestamp":"2023-07-04T16:32:22.223983229Z","text":"2023/07/04 16:32:22 Writing lock-file to: /tmp/.lock\n"}
{"name":"env","namespace":"","instance":"env-5b6d68d94c-qqdtj","timestamp":"2023-07-04T16:32:22.223987809Z","text":"2023/07/04 16:32:22 Metrics listening on port: 8081\n"}
{"name":"env","namespace":"","instance":"env-5b6d68d94c-qqdtj","timestamp":"2023-07-04T16:32:23.380573646Z","text":"2023/07/04 16:32:23 Forking fprocess.\n"}
{"name":"env","namespace":"","instance":"env-5b6d68d94c-qqdtj","timestamp":"2023-07-04T16:32:23.382405318Z","text":"2023/07/04 16:32:23 Wrote 932 Bytes - Duration: 0.001823s\n"}
```

--------------------------------

### Publish and deploy function in one step

Source: https://docs.openfaas.com/openfaas-pro/builder

Combines the build and deployment process into a single command. It first builds the function image using the remote builder and then deploys it to the cluster.

```bash
faas-cli up --remote-builder http://127.0.0.1:8081/build \
  --payload-secret $HOME/.openfaas/payload.txt
```

--------------------------------

### Install ingress-nginx using arkade

Source: https://docs.openfaas.com/tutorials/local-kind-ingress

Install the ingress-nginx controller into your Kubernetes cluster using the arkade CLI tool.

```bash
arkade install ingress-nginx
```

--------------------------------

### Stack.yml for Function Deployment with Git SHA

Source: https://docs.openfaas.com/openfaas-pro/dashboard

Example of a stack.yml configuration for deploying a function, specifically showing how to use environment substitution for the Git SHA. This allows dynamic updates of the SHA during CI/CD.

```yaml
functions:
  cows:
    lang: golang-middleware
    handler: ./cows
    image: alexellis2/cows:0.1
    labels:
      com.openfaas.git-sha: ${GIT_SHA:-dev}
```

--------------------------------

### Install OpenFaaS CLI

Source: https://docs.openfaas.com/tutorials/CLI-with-node

Installs the latest version of the OpenFaaS CLI using curl. This command requires sudo privileges.

```bash
$ curl -sL https://cli.openfaas.com | sudo sh

```

--------------------------------

### Deploy OpenFaaS Function

Source: https://docs.openfaas.com/tutorials/first-python-function

Deploys the 'hello-python' function to the OpenFaaS gateway using the provided YAML configuration.

```bash
$ faas-cli deploy -f ./hello-python.yml
```

--------------------------------

### Install Jenkins with Helm

Source: https://docs.openfaas.com/reference/cicd/jenkins

Use Helm to install Jenkins on a Kubernetes cluster. Ensure RBAC is enabled for proper permissions.

```bash
$ helm install --name cicd stable/jenkins --set rbac.install=true

```

--------------------------------

### List Functions with Basic Authentication

Source: https://docs.openfaas.com/reference/rest-api

Use this command to list all functions when using Basic Authentication with the root user account. Ensure the HOST and PASSWORD environment variables are set correctly.

```bash
export HOST="127.0.0.1:8080"
export PASSWORD=""

curl -s \
    http://admin:$PASSWORD@$HOST/system/functions

```

--------------------------------

### Deploying and Invoking with Debug Output

Source: https://docs.openfaas.com/cli/logs

This sequence demonstrates deploying a function with debug output enabled and then invoking it, showing how to capture and filter the logs.

```bash
faas-cli store deploy SentimentAnalysis --env write_debug=true
echo "i like code" | faas-cli invoke sentimentanalysis
echo "i like functions" | faas-cli invoke sentimentanalysis
echo "i like containers" | faas-cli invoke sentimentanalysis

```

--------------------------------

### Configure OpenFaaS Dashboard in values.yaml

Source: https://docs.openfaas.com/openfaas-pro/dashboard

Example configuration for enabling and setting up the OpenFaaS Dashboard within the `values.yaml` file for the OpenFaaS Helm chart. It includes enabling the dashboard, setting a public URL, and specifying the signing key secret.

```yaml
dashboard:
  enabled: true
  publicURL: https://dashboard.example.com
  # Name of signing key secret for sessions.
  # Can be left blank for development deployments.
  signingKeySecret: "dashboard-jwt"
```

--------------------------------

### Install Bash Completion for MacOS

Source: https://docs.openfaas.com/cli/completion

Install bash-completion@2 and configure your environment for Bash completion on MacOS. Requires Bash 4.1+.

```bash
$ brew install bash-completion@2
```

```bash
export BASH_COMPLETION_COMPAT_DIR="/usr/local/etc/bash_completion.d"
[[ -r "/usr/local/etc/profile.d/bash_completion.sh" ]] && . "/usr/local/etc/profile.d/bash_completion.sh"
```

```bash
$ echo 'source <(faas-cli completion --shell bash)' >>~/.bashrc
```

```bash
$ faas-cli completion --shell bash > /etc/bash_completion.d/faas-cli
```

--------------------------------

### Install faas-cli with Homebrew

Source: https://docs.openfaas.com/cli/install

Install the faas-cli using Homebrew on macOS. Note that the Homebrew version may lag behind the latest release.

```bash
brew install faas-cli

```

--------------------------------

### Build, Push, and Deploy Function

Source: https://docs.openfaas.com/tutorials/local-kind-registry

Use the 'faas-cli up' command to build the function's Docker image, push it to the configured registry, and deploy it to Kubernetes in a single step.

```bash
faas-cli up -f pydict.yml
```

--------------------------------

### Build, Deploy, and Invoke Function

Source: https://docs.openfaas.com/openfaas-pro/scale-to-zero

Build the function, push its image, and deploy it to your OpenFaaS Pro cluster. Then, invoke the function to test its deployment.

```bash
# Build, push and deploy the function:
faas-cli up -f daily-job.yml

# Invoke the function:
echo | faas-cli invoke daily-job

```

--------------------------------

### Example OpenFaaS Pro Telemetry Output

Source: https://docs.openfaas.com/deployment/pro

This is an example of the JSON output you can expect when querying the telemetry endpoint, showing cluster and function statistics.

```json
{
  "s": "0.0.2",
  "v": "0.5.61-8-gc2c68d17",
  "data": {
    "uptime": 5717804906149224,
    "license_email": "admin@example.com",
    "namespace": "openfaas",
    "operator_version": "0.5.61-8-gc2c68d17",
    "k8s_version": "v1.29.3+k3s1",
    "total_fns": 24,
    "total_namespaces": 4,
    "total_replicas": 20,
    "invocations_daily": 3.000266226477385,
    "seconds_daily": 0.014143783188987933
  }
}
```

--------------------------------

### Set up self-hosted PostgreSQL with WAL mode

Source: https://docs.openfaas.com/openfaas-pro/postgres-events

Use Docker to run a PostgreSQL instance, modify its configuration for WAL mode, and restart it.

```bash
docker run --rm --name pg -e POSTGRES_PASSWORD=passwd -p 5432:5432 -ti postgres:latest

docker cp pg:/var/lib/postgresql/data/postgresql.conf postgresql.conf

echo "wal_level = logical" | tee -a postgresql.conf
echo "max_wal_senders = 10" | tee -a postgresql.conf
echo "max_replication_slots = 5" | tee -a postgresql.conf

docker cp postgresql.conf pg:/var/lib/postgresql/data/postgresql.conf

docker restart pg
```

--------------------------------

### Pre-create Secrets Folder and Secret

Source: https://docs.openfaas.com/edge/preloading

Create the secrets folder and a sample secret for a function in the 'openfaas-fn' namespace.

```bash
mkdir -p /var/lib/faasd-provider/secrets/openfaas-fn
echo "secret" | sudo tee /var/lib/faasd-provider/secrets/openfaas-fn/api-key

```

--------------------------------

### Function Timeout Example (stack.yaml)

Source: https://docs.openfaas.com/tutorials/expanded-timeouts

Example of setting environment variables for function timeouts in `stack.yaml`. Note that `exec_timeout` should not exceed the gateway's `upstream_timeout`.

```yaml
functions:
  job:
    environment:
      write_timeout: 5m1s
      read_timeout: 5m1s
      exec_timeout: 5m

```

--------------------------------

### Configure Docker Build Context

Source: https://docs.openfaas.com/openfaas-pro/builder

Sets environment variables for the image registry and owner, then creates a configuration file for the Docker build. The 'platforms' key is optional and specifies the image platform.

```bash
export REGISTRY=ttl.sh
export OWNER=alexellis2
echo -n '{"image": "'$REGISTRY'/'$OWNER'/test-image-hello:0.1.0", "platforms": ["linux/amd64"]}' > com.openfaas.docker.config
```

--------------------------------

### Printer Function Log Output Example

Source: https://docs.openfaas.com/openfaas-pro/rabbitmq-events

Example log output from the 'printer' function after receiving a message from RabbitMQ. Shows connector headers and the message payload.

```text
faas-cli logs printer

2024-12-03T14:36:03Z X-Connector=[connector-sdk openfaasltd/rabbitmq-connector]
2024-12-03T14:36:03Z X-Topic=[queue1]
2024-12-03T14:36:03Z Accept-Encoding=[gzip]
2024-12-03T14:36:03Z Content-Type=[text/plain]
2024-12-03T14:36:03Z X-Call-Id=[d0ab9f9e-0c93-46b1-a4dd-695a037acb38]
2024-12-03T14:36:03Z 2024/12/03 14:36:03 POST / - 202 Accepted - ContentLength: 0B (0.0003s)
2024-12-03T14:36:03Z X-Forwarded-Host=[gateway.openfaas:8080]
2024-12-03T14:36:03Z X-Rabbitmq-Msg-Id=[1]
2024-12-03T14:36:03Z X-Start-Time=[1733236563468386644]
2024-12-03T14:36:03Z X-Forwarded-For=[10.42.0.13:55796]
2024-12-03T14:36:03Z X-Rabbitmq-Routing-Key=[queue1]
2024-12-03T14:36:03Z User-Agent=[openfaas-gateway/0.4.34]
2024-12-03T14:36:03Z 
2024-12-03T14:36:03Z Hello, Task Queue!
2024-12-03T14:36:03Z 

```

--------------------------------

### JSON Log Format Example

Source: https://docs.openfaas.com/cli/logs

This example shows how to retrieve logs in JSON format using the `faas-cli logs` command with the `--format json` flag.

```bash
$ faas-cli logs trove --format json

```

```json
{"name":"trove","namespace":"openfaas-fn","instance":"9174","timestamp":"2021-02-12T17:01:03.088068Z","text":"User requested \"Insiders Update: 1st Feb 2020 - Java, KubeCon, Istio, Crossplane and more!\""}

```