Working with Docker Extensions

docker extension install portainer/portainer

$ docker extension ls
ID                    NAME                  VERSION    STATUS
my-extension          My Extension          v1.0.0     enabled
another-extension     Another Extension     v2.1.0     disabled

$ docker extension ls --filter status=enabled
ID                    NAME                  VERSION    STATUS
my-extension          My Extension          v1.0.0     enabled

docker extension update docker/desktop

docker extension remove my-extension

docker extension install my-extension:latest

# Open Docker Desktop
# Navigate to Extensions tab
# Click on "Marketplace" button

# Example CLI command to search extensions (if available)
docker extension search "my-extension"

docker extension install my-extension --permission docker:extension:read,docker:extension:write

{
  "extension": {
    "enabled": true,
    "debug": true
  }
}

docker run -d --name mysql-db \
  -e MYSQL_ROOT_PASSWORD=mypassword \
  -e MYSQL_DATABASE=testdb \
  -p 3306:3306 \
  mysql:8.0

CREATE TABLE users (
  id SERIAL PRIMARY KEY,
  name VARCHAR(100),
  email VARCHAR(100) UNIQUE
);

version: '3'
services:
  prometheus:
    image: prom/prometheus
    ports:
      - "9090:9090"
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml
  docker-exporter:
    image: quay.io/prometheus/node-exporter
    ports:
      - "9100:9100"

{
  "dashboard": {
    "title": "Docker Container Metrics",
    "panels": [
      {
        "title": "CPU Usage",
        "type": "graph",
        "targets": [
          {
            "expr": "rate(container_cpu_usage_seconds_total[5m])"
          }
        ]
      }
    ]
  }
}

docker run --rm -v /var/run/docker.sock:/var/run/docker.sock aquasec/trivy image nginx:latest

{
  "name": "my-docker-extension",
  "version": "1.0.0",
  "description": "A custom Docker extension",
  "icon": "icon.svg",
  "ui": {
    "dashboard": {
      "path": "/dashboard"
    }
  },
  "backend": {
    "binary": "my-extension-binary"
  }
}

<div id="dashboard">
  <h2>My Extension Dashboard</h2>
  <p>This dashboard shows Docker container stats.</p>
</div>

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/stats", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "{"containers": 5}")
    })
    http.ListenAndServe(":8080", nil)
}