fsouza / go-dockerclient

Go client for the Docker Engine API.

go-dockerclient

This package presents a client for the Docker remote API. It also provides support for the extensions in the Swarm API.

This package also provides support for docker's network API, which is a simple passthrough to the libnetwork remote API.

For more details, check the remote API documentation.

Difference between go-dockerclient and the official SDK

Link for the official SDK: https://docs.docker.com/develop/sdk/

go-dockerclient was created before Docker had an official Go SDK and is still maintained and active because it's still used out there. New features in the Docker API do not get automatically implemented here: it's based on demand, if someone wants it, they can file an issue or a PR and the feature may get implemented/merged.

For new projects, using the official SDK is probably more appropriate as go-dockerclient lags behind the official SDK.

Example

package main

import (
	"fmt"

	docker "github.com/fsouza/go-dockerclient"
)

func main() {
	client, err := docker.NewClientFromEnv()
	if err != nil {
		panic(err)
	}
	imgs, err := client.ListImages(docker.ListImagesOptions{All: false})
	if err != nil {
		panic(err)
	}
	for _, img := range imgs {
		fmt.Println("ID: ", img.ID)
		fmt.Println("RepoTags: ", img.RepoTags)
		fmt.Println("Created: ", img.Created)
		fmt.Println("Size: ", img.Size)
		fmt.Println("VirtualSize: ", img.VirtualSize)
		fmt.Println("ParentId: ", img.ParentID)
	}
}

Using with TLS

In order to instantiate the client for a TLS-enabled daemon, you should use NewTLSClient, passing the endpoint and path for key and certificates as parameters.

package main

import (
	"fmt"

	docker "github.com/fsouza/go-dockerclient"
)

func main() {
	const endpoint = "tcp://[ip]:[port]"
	path := os.Getenv("DOCKER_CERT_PATH")
	ca := fmt.Sprintf("%s/ca.pem", path)
	cert := fmt.Sprintf("%s/cert.pem", path)
	key := fmt.Sprintf("%s/key.pem", path)
	client, _ := docker.NewTLSClient(endpoint, cert, key, ca)
	// use client
}

If using docker-machine, or another application that exports environment variables DOCKER_HOST, DOCKER_TLS_VERIFY, DOCKER_CERT_PATH, DOCKER_API_VERSION, you can use NewClientFromEnv.

package main

import (
	"fmt"

	docker "github.com/fsouza/go-dockerclient"
)

func main() {
	client, err := docker.NewClientFromEnv()
	if err != nil {
		// handle err
	}
	// use client
}

See the documentation for more details.

Developing

All development commands can be seen in the Makefile.

Committed code must pass:

• golangci-lint
• go test
• staticcheck

Running make test will run all checks, as well as install any required dependencies.