Docker Curl

30-04-2021 by



  1. Docker Curl
  2. Docker Curl Install
  3. Docker Image With Curl
  4. Get Docker Script

We and third parties use cookies or similar technologies ('Cookies') as described below to collect and process personal data, such as your IP address or browser information. Just download the latest Docker image to update curl to the newest version, and don’t worry about its implementation across different systems. Prerequisites are light. First, make sure to have the Docker for Windows app installed (stable or beta are both fine) as well as a semi-recent version of Powershell.

  1. Docker Daemon - The background service running on the host that manages building, running and distributing Docker containers. The daemon is the process that runs in the operating system which clients talk to. Docker Client - The command line tool that allows the user to interact.
  2. Docker allows you to package an application with its environment and all of its dependencies into a 'box', called a container. Usually, a container consists of an application running in a stripped-to-basics version of a Linux operating system. Now you can call your app using curl (install if needed via: sudo apt-get install curl): $ curl-i.

Estimated reading time: 4 minutes

Docker Desktop provides several networking features to make it easier touse.

Features

VPN Passthrough

Docker Desktop networking can work when attached to a VPN. To do this,Docker Desktop intercepts traffic from the containers and injects it intoWindows as if it originated from the Docker application.

Port Mapping

When you run a container with the -p argument, for example:

Docker Desktop makes whatever is running on port 80 in the container (inthis case, nginx) available on port 80 of localhost. In this example, thehost and container ports are the same. What if you need to specify a differenthost port? If, for example, you already have something running on port 80 ofyour host machine, you can connect the container to a different port:

Now, connections to localhost:8000 are sent to port 80 in the container. Thesyntax for -p is HOST_PORT:CLIENT_PORT.

HTTP/HTTPS Proxy Support

See Proxies.

Known limitations, use cases, and workarounds

Docker Curl

Following is a summary of current limitations on the Docker Desktop for Windowsnetworking stack, along with some ideas for workarounds.

There is no docker0 bridge on Windows

Because of the way networking is implemented in Docker Desktop for Windows, you cannotsee a docker0 interface on the host. This interface is actually within thevirtual machine.

I cannot ping my containers

Docker Desktop for Windows can’t route traffic to Linux containers. However, you canping the Windows containers.

Per-container IP addressing is not possible

The docker (Linux) bridge network is not reachable from the Windows host.However, it works with Windows containers.

Docker

Use cases and workarounds

There are two scenarios that the above limitations affect:

I want to connect from a container to a service on the host

Docker Curl

The host has a changing IP address (or none if you have no network access). We recommend that you connect to the special DNS namehost.docker.internal which resolves to the internal IP address used by thehost. This is for development purpose and will not work in a production environment outside of Docker Desktop for Windows.

You can also reach the gateway using gateway.docker.internal.

If you have installed Python on your machine, use the following instructions as an example to connect from a container to a service on the host:

  1. Run the following command to start a simple HTTP server on port 8000.

    python -m http.server 8000

    If you have installed Python 2.x, run python -m SimpleHTTPServer 8000.

  2. Now, run a container, install curl, and try to connect to the host using the following commands:

I want to connect to a container from Windows

Port forwarding works for localhost; --publish, -p, or -P all work.Ports exposed from Linux are forwarded to the host.

Our current recommendation is to publish a port, or to connect from anothercontainer. This is what you need to do even on Linux if the container is on anoverlay network, not a bridge network, as these are not routed.

Docker Curl Install

Docker Curl

The command to run the nginx webserver shown in Getting Startedis an example of this.

Docker Image With Curl

Docker compose curl

To clarify the syntax, the following two commands both publish container’s port 80 to host’s port 8000:

To publish all ports, use the -P flag. For example, the following commandstarts a container (in detached mode) and the -P flag publishes all exposed ports of thecontainer to random ports on the host.

See the run command for more details onpublish options used with docker run.

windows, networking

My platform:
Windows 10; Version 1707
Docker version:
Version: 17.12.0-ce
API version: 1.35
Go version: go1.9.2
Git commit: c97c6d6
Built: Wed Dec 27 20:05:22 2017
OS/Arch: windows/amd64

I have been following a tutorial that requires me to run Ubuntu 16.04, so I downloaded the docker image, and I have started it as follows:

docker run -it ubuntu:16.04 bash

When I get the # prompt, however I’m unable to run curl command, I just get this error:
bash: curl: command not found

Get Docker Script

I’ve tried looking up instructions on how to install the curl command but none of the commands like sudo or wget are found either. Need help to get past this. Thx





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