Files
moby/client
Cory Snider 9ebbf652bd client: do not modify user-provided HTTP client
The http.Client passed into client.WithHTTPClient() is modified by the
constructor in-place: the value of its Transport field is mutated and
wrapped in an OpenTelemetry decorator. This can lead to very surprising
behaviour when a second client is constructed reusing the same
http.Client value. If the http.Client is configured for TLS, the second
client will fail to detect that and will incorrectly dial the Engine API
socket as cleartext HTTP. Copy the provided http.Client so our
modifications don't leak out to unexpected places.

Signed-off-by: Cory Snider <csnider@mirantis.com>
2026-01-06 18:14:13 -05:00
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Go client for the Docker Engine API

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The docker command uses this package to communicate with the daemon. It can also be used by your own Go applications to do anything the command-line interface does; running containers, pulling or pushing images, etc.

For example, to list all containers (the equivalent of docker ps --all):

package main

import (
	"context"
	"fmt"

	"github.com/moby/moby/client"
)

func main() {
	// Create a new client that handles common environment variables
	// for configuration (DOCKER_HOST, DOCKER_API_VERSION), and does
	// API-version negotiation to allow downgrading the API version
	// when connecting with an older daemon version.
	apiClient, err := client.New(client.FromEnv)
	if err != nil {
		panic(err)
	}
	defer apiClient.Close()

	// List all containers (both stopped and running).
	result, err := apiClient.ContainerList(context.Background(), client.ContainerListOptions{
		All: true,
	})
	if err != nil {
		panic(err)
	}

	// Print each container's ID, status and the image it was created from.
	fmt.Printf("%s  %-22s  %s\n", "ID", "STATUS", "IMAGE")
	for _, ctr := range result.Items {
		fmt.Printf("%s  %-22s  %s\n", ctr.ID, ctr.Status, ctr.Image)
	}
}

Full documentation is available on pkg.go.dev.