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- Configure Docker to use the certificates you generated in Step 1. Find or create the /etc/docker/daemon.json file. Add the following properties to the daemon.json file.
- The config.json file stores a JSON encoding of several properties: The HttpHeaders property specifies a set of headers to include in all messages sent from the Docker client to the daemon. Docker does not try to interpret or understand these header; it simply puts them into the messages.
- The config.json file stores a JSON encoding of several properties: The HttpHeaders property specifies a set of headers to include in all messages sent from the Docker client to the daemon. Docker does not try to interpret or understand these header; it simply puts them into the messages.
- The json-file logging driver has a few more options, and we can even change to other logging drivers such as syslog. For more information, please refer to the Docker Docs — Configure logging drivers. Execute the following commands to reload the updated daemon.json. The new configuration will apply to all newly created containers after restart.
The Docker Engine and client aren't included with Windows and need to be installed and configured individually. Furthermore, the Docker Engine can accept many custom configurations. Some examples include configuring how the daemon accepts incoming requests, default networking options, and debug/log settings. On Windows, these configurations can be specified in a configuration file or by using Windows Service control manager. This document details how to install and configure the Docker Engine, and also provides some examples of commonly used configurations.
When you start Docker Desktop in Windows container mode, if C: ProgramData Docker config daemon.json does not exist, it will get created with some default values. You can create it beforehand or edit it afterwards (and restart Docker Desktop). Or you can use the UI (Settings / Docker Engine), which validates the changes.
Install Docker
You need Docker in order to work with Windows Containers. Docker consists of the Docker Engine (dockerd.exe), and the Docker client (docker.exe). The easiest way to get everything installed is in the quickstart guide, which will help you get everything set up and run your first container.
For scripted installations, see Use a script to install Docker EE.
Before you can use Docker, you'll need to install the container images. For more information, see docs for our container base images.
Configure Docker with a configuration file
The preferred method for configuring the Docker Engine on Windows is using a configuration file. The configuration file can be found at 'C:ProgramDataDockerconfigdaemon.json'. You can create this file if it doesn't already exist.
Note
Not every available Docker configuration option applies to Docker on Windows. The following example shows the configuration options that do apply. For more information about Docker Engine configuration, see Docker daemon configuration file.
You only need to add the desired configuration changes to the configuration file. For example, the following sample configures the Docker Engine to accept incoming connections on port 2375. All other configuration options will use default values.
Likewise, the following sample configures the Docker daemon to keep images and containers in an alternate path. If not specified, thedefault is c:programdatadocker.
The following sample configures the Docker daemon to only accept secured connections over port 2376.
Configure Docker on the Docker service
The Docker Engine can also be configured by modifying the Docker service with sc config. Using this method, Docker Engine flags are set directly on the Docker service. Run the following command in a command prompt (cmd.exe not PowerShell):
Note
You don't need to run this command if your daemon.json file already contains the 'hosts': ['tcp://0.0.0.0:2375'] entry.
Common configuration
The following configuration file examples show common Docker configurations. These can be combined into a single configuration file.
Default network creation
To configure the Docker Engine so that it doesn't create a default NAT network, use the following configuration.
For more information, see Manage Docker Networks.
Set Docker security group
When you've signed in to the Docker host and are locally running Docker commands, these commands are run through a named pipe. By default, only members of the Administrators group can access the Docker Engine through the named pipe. To specify a security group that has this access, use the group flag.
Proxy configuration
To set proxy information for docker search and docker pull, create a Windows environment variable with the name HTTP_PROXY or HTTPS_PROXY, and a value of the proxy information. This can be completed with PowerShell using a command similar to this:
Once the variable has been set, restart the Docker service.
For more information, see Windows Configuration File on Docker.com.
How to uninstall Docker
This section will tell you how to uninstall Docker and perform a full cleanup of Docker system components from your Windows 10 or Windows Server 2016 system.
Note
You must run all commands in these instructions from an elevated PowerShell session.
Prepare your system for Docker's removal
Before you uninstall Docker, make sure no containers are running on your system.
Run the following cmdlets to check for running containers:
It's also good practice to remove all containers, container images, networks, and volumes from your system before removing Docker. You can do this by running the following cmdlet:
Uninstall Docker
Next, you'll need to actually uninstall Docker.
To uninstall Docker on Windows 10
- Go to Settings > Apps on your Windows 10 machine
- Under Apps & Features, find Docker for Windows
- Go to Docker for Windows > Uninstall
To uninstall Docker on Windows Server 2016:
From an elevated PowerShell session, use the Uninstall-Package and Uninstall-Module cmdlets to remove the Docker module and its corresponding Package Management Provider from your system, as shown in the following example:
Tip
You can find the Package Provider that you used to install Docker with PS C:> Get-PackageProvider -Name *Docker*
Clean up Docker data and system components
After you uninstall Docker, you'll need to remove Docker's default networks so their configuration won't remain on your system after Docker is gone. You can do this by running the following cmdlet:
To remove Docker's default networks on Windows Server 2016.
Run the following cmdlet to remove Docker's program data from your system:
You may also want to remove the Windows optional features associated with Docker/containers on Windows.
This includes the 'Containers' feature, which is automatically enabled on any Windows 10 or Windows Server 2016 when Docker is installed. It may also include the 'Hyper-V' feature, which is automatically enabled on Windows 10 when Docker is installed, but must be explicitly enabled on Windows Server 2016.
Important
The Hyper-V feature is a general virtualization feature that enables much more than just containers. Before disabling the Hyper-V feature, make sure there are no other virtualized components on your system that require Hyper-V.
To remove Windows features on Windows 10:
- Go to Control Panel > Programs > Programs and Features > Turn Windows features on or off.
- Find the name of the feature or features you want to disable—in this case, Containers and (optionally) Hyper-V.
- Uncheck the box next to the name of the feature you want to disable.
- Select 'OK'
To remove Windows features on Windows Server 2016:
From an elevated PowerShell session, run the following cmdlets to disable the Containers and (optionally) Hyper-V features from your system:
Reboot your system
To finish uninstallation and cleanup, run the following cmdlet from an elevated PowerShell session to reboot your system:
Docker’s out-of-the-box authorization model is all or nothing. But many usersrequire finer-grained access control and Docker’s plugin infrastructure allowsus to do so.
This is an excellent opportunity to see how to policy enable an existingservice.
Goals
This tutorial helps you get started with OPA and introduces you to core conceptsin OPA.
Policy enabling an application decouples the policy implementation from thebusiness logic so that administrators can define policy without changing theapplication while still keeping up with the size, complexity, and dynamicnature of modern applications.
For the purpose of this tutorial, we want to use OPA to enforce a policy thatprevents users from running insecure containers.
This tutorial illustrates two key concepts:
OPA policy definition is decoupled from the implementation of the service(in this case Docker). The administrator is empowered to define and managepolicies without requiring changes to any of the apps.
Both the data relevant to policy and the policy definitions themselves canchange rapidly.
Prerequisites
This tutorial requires:
- Docker Engine 18.06.0-ce or newer
- Docker API version 1.38 or newer
rootorsudoaccess
The tutorial has been tested on the following platforms:
- Ubuntu 18.04 (64-bit)
If you are using a different distro, OS, or architecture, the steps will be thesame. However, there may be slight differences in the commands you need to run.
Steps
Several of the steps below require root or sudo access. When you aremodifying files under /etc/docker or signalling the Docker daemon torestart, you will need root access.
1. Create an empty policy definition that will allow all requests.
This policy defines a single rule named allow that always produces thedecision true. Once all of the components are running, we will come back tothe policy.
2. Install the opa-docker-authz plugin.
You need to configure the Docker daemon to use the plugin for authorization.
Signal the Docker daemon to reload the configuration file.
4. Run a simple Docker command to make sure everything is still working.
If everything is setup correctly, the command should exit successfully. You canexpect to see log messages from OPA and the plugin.
5. Test that the policy definition is working.
Let’s modify our policy to deny all requests:
In OPA, rules defines the content of documents. Documents be boolean values(true/false) or they can represent more complex structures using arrays,objects, strings, etc.
In the example above we modified the policy to always return false so thatrequests will be rejected.
The output should be:
To learn more about how rules define the content of documents, see: How Does OPA Work?
With this policy in place, users will not be able to run any Docker commands. Goahead and try other commands such as docker run or docker pull. They willall be rejected.
Now let’s change the policy so that it’s a bit more useful.
6. Update the policy to reject requests with the unconfined seccomp profile:
7. Test the policy is working by running a simple container:
Now try running the same container but disable seccomp (which should beprevented by the policy):
Congratulations! You have successfully prevented containers from running withoutseccomp!
The rest of the tutorial shows how you can grant fine grained access to specificclients.
8. Identify the user in Docker requests.
Back up your existing Docker configuration, just in case. You can replace youroriginal configuration after you are done with the tutorial.
Docker Docker Daemon Json Configure
To identify the user, include an HTTP header in all of the requests sent to theDocker daemon:
Docker does not currently provide a way to authenticate clients. But in Docker1.12, clients can be authenticated using TLS and there are plans to includeother means of authentication. For the purpose of this tutorial, we assume thatan authentication system is place.
9. Update the policy to include basic user access controls.
10. Attempt to run a container.
Because the configured user is 'bob', the request is rejected:
11. Change the user to “alice” and re-run the container.
Because the configured user is 'alice', the request will succeed:
Docker Docker Daemon Json Config Download
That’s it!