Docker daemon explanation

Docker daemon explanation. To know more about working of docker refer to the Architecture of Docker . You signed out in another tab or window. The Docker daemon streamed that output to the Docker client, which sent it # to your terminal. s. While bind mounts are dependent on the directory structure and OS of the host machine, volumes are completely managed by Docker. Dec 20, 2022 · Docker REST API - This is an API interface that applications use to talk with the Docker Daemon and provide instructions. Aug 6, 2020 · A full explanation of the docker-proxy is available here. PS E: \> docker stats CONTAINER ID CPU % PRIV WORKING SET NET I / O BLOCK I / O 09d3bb5b1604 6. Note. Sep 13, 2022 · attach Attach to a running container build Build an image from a Dockerfile commit Create a new image from a container's changes cp Copy files/folders between a container and the local filesystem create Create a new container diff Inspect changes on a container's filesystem events Get real time events from the server exec Run a command in a running container export Export a container's Docker inspect provides detailed information on constructs controlled by Docker. json. 57 MB 9db7aa4d986d 9. In simple terms, it’s the main part of the Docker architecture for creating, managing, and running container applications. Volumes have several advantages over bind mounts: Volumes are easier to back up or migrate than bind mounts. It has an API for interacting with the Docker daemon. Jun 24, 2021 · Docker build: docker build is a command that you use to build an image from a Dockerfile. # 4. It is the location where the Docker images are stored. Mar 14, 2023 · Docker Image: In layman terms, Docker Image can be compared to a template which is used to create Docker Containers. Use the following links to navigate key sections of the Compose Specification. It is the user's responsibility to avoid name conflicts. A Docker host is a type of machine that is responsible for running more than one container. The Docker client lets users interact with the Docker daemon with its command-line interface (CLI). To build a Docker Image, we can use the CLI (client) to issue a build command to Daemon data directory The Docker daemon persists all data in a single directory. It offers various Docker objects such as images, containers, networking, and storage. To get started with Docker Engine on Ubuntu, make sure you meet the prerequisites, and then follow the installation steps. This simple tutorial will guide you step-by-step on how to do it. Compose simplifies the control of your entire application stack, making it easy to manage services, networks, and volumes in a single, comprehensible YAML configuration file. Starting the Docker Daemon. By default, docker inspect will render results in a JSON array. The Docker daemon is the process that runs the containers, the Docker client is the command-line interface, and the Docker registry is the storage location for images. Firstly, it’s necessary to understand what exactly A container is a standard unit of software that packages up code and all its dependencies so the application runs quickly and reliably from one computing environment to another. json is the file name which is being used to Configure Docker daemon. Docker CLI - This is a command line interface for interacting with the Docker daemon. You can use docker run to run the image and create a container. There are two ways to Don't want to have to run docker commands with sudo all the time? Follow this guide to add yourself to the docker group. The Docker Daemon, also known as Docker Engine, provides a powerful tool for developing, shipping, and running applications using Aug 11, 2023 · start docker daemon linux. com May 16, 2017 · The Docker daemon is a service that runs on your host operating system. On the other hand, as stated earlier, a Docker Container is a logical entity Jan 23, 2022 · Docker API: This is a REST API exposed by the daemon to accept instructions/commands from tools such as the Docker client. exe Server: Containers: 1 Running: 0 Paused: 0 Stopped: 1 Optionally, limit the number of restart retries the Docker daemon attempts. 6 days ago · You signed in with another tab or window. Docker daemon acts as a bridge between the Docker client and the Docker engine, and integrates with the host OS, registry, and other components. The Docker daemon created a new container from that image which runs the executable that produces the output you are currently reading. The Docker Engine API is used to get the request from the client and send a request to Docker Daemon to manage the container and other components accordingly. To better understand this interaction, let’s talk about what happens when you run the docker run command:. Note Jun 25, 2018 · It is equivalent to running docker stop, but with a default signal of SIGKILL, which forcefully terminates the container. Mar 19, 2024 · docker-compose start. When you use docker run command to start up a container, your docker client will translate that command into http API call, sends it to docker daemon, Docker daemon then evaluates the request, talks to underlying os and provisions your container. Docker Desktop is not supported on server versions of Windows, such as Windows Server 2019 or Windows Server 2022. It comprises the Docker daemon, Images, Containers, Networks, and Storage. – web: Names our service “web”. json file, which is located in /etc/docker/ on Linux hosts or C:\ProgramData\docker\config\ on Windows Server. Docker API is used by Docker commands. You can manage volumes using Docker CLI commands or the Docker API. – services: Defines the services for the application. It's a background service running on the Aug 11, 2023 · check if docker daemon is running. What is Docker Image? Docker daemon attack surface. This article will guide you in starting the Docker daemon in Linux. 00 % 28. If you're running Windows 10 or 11, we recommend that you install Docker Desktop instead. 8. It is responsible for running containers to manage docker services. docker cp doesn't create parent directories for DEST_PATH if they don't exist. Shutdown The /var/lib/docker/ directory must be mounted on a ZFS-formatted filesystem. Aug 11, 2023 · Simple docker step by step how to start docker daemon windows with explanation In this tutorial, you’ll learn a straightforward process to start the Docker daemon in Windows. You can connect a running container to multiple networks, either by passing the --network flag multiple times when creating the container, or using the docker network connect command for already By default, Docker containers are "unprivileged" and cannot, for example, run a Docker daemon inside a Docker container. Official Roadmaps Made by subject matter experts Projects Skill-up with real-world projects Best Practices Do's and don'ts Questions Test and Practice your knowledge Guides In-depth articles and tutorials Videos Animated and interactive content Shop Get some cool swag Advertise Promote your product or service The Docker Engine can also be configured by modifying the Docker service with sc config. 64 MiB 64 kB / 6. So customizing Docker via the config file is a Feb 1, 2021 · The Docker daemon pulled the "hello-world" image from the Docker Hub. Docker daemon: Docker daemon is a service that creates and manages Docker images, by using the commands from the client. Before you install Docker, make sure you consider the following security implications and firewall incompatibilities. If our file has a different name than the default one (docker-compose. yml), we can exploit the -f and ––file flags to specify an alternate file name: docker-compose -f custom-compose-file. In simple terms, a Docker Image is a template that contains the application, and all the dependencies required to run that application on Docker. In this self-paced, hands-on tutorial, you will learn how to build images, run containers, use volumes to persist data and mount in source code, and define your application using Docker Compose. If you override this option without specifying a hosts entry in the daemon. Dockerfile: A Dockerfile is a text-based document that holds the instructions for building Docker images. The docker stats reference page has more details about the docker stats command. And 46% directly edit the config file themselves rather than use flags. Docker Desktop Apr 5, 2024 · Docker Architecture includes a Docker client – used to trigger Docker commands, a Docker Host – running the Docker Daemon and a Docker Registry – storing Docker Images. Do not confuse Docker Swarm mode with Docker Classic Swarm which is no longer actively developed. This daemon requires root privileges unless you opt-in to Rootless mode, and you should therefore be aware of some important details. Essentially the Docker Dockerfile. When you install the Docker daemon on Windows Server, the daemon doesn't contain Docker components such as buildx and compose. The Docker client and daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. (arm64v8) 3. If the file does not exist, create it first. All Docker daemon tasks are possible due to the Docker API. Control groups. The image above shows that the currently supported version of the Docker Compose CLI is Compose V2 which is defined by the Compose Specification. Docker follows Client-Server architecture, which Docker Swarm mode is built into the Docker Engine. The Docker API specifies the interface program to communicate with the daemon and instruct it on what to do. Docker Engine acts as a client-server application with: A server with a long-running daemon process dockerd. Start the daemon using operating system utilities. # (amd64) # 3. It is responsible for creating and managing Docker Images, Containers, Networks and Volumes on the Docker Known limitations. 84 kB 4. The Compose Specification on Docker Docs is the Docker Compose implementation. To generate this message, Docker took the following steps: 1. What you'll learn. 7 MB / 3. The Docker daemon pulled the "hello-world" image from the Docker Hub. The summary is that the proxy is used to handle connections originating from the local machine that might otherwise not pass through the iptables rules that Docker configures to handle port forwarding, or when Docker has been configured such that it does not manipulate iptables at all. 19 % 38. The local timezone on the daemon will be used if you do not provide either a Z or a +-00:00 timezone offset at the end of the timestamp. Mar 4, 2016 · Docker Daemon. Use docker save to save containers, and push existing images to Docker Hub or a private repository, so that you do not need to re-create them later. 0:2375" Docker Build is one of Docker Engine's most used features. The property HttpHeaders specifies a set of headers to include in all messages sent from the Docker client to the daemon. What is Docker Daemon. Mar 30, 2021 · Master Docker for a career boost! 🚢 This beginner-friendly tutorial covers the essentials for software and DevOps engineers. It helps you to perform tasks such as running, stopping, and terminating containers and images to mention a few. . Only the following storage drivers are supported: overlay2 (only if running with kernel 5. Format the output (--format) If a format is specified, the given template will be executed for each result. 0 Context: default Debug Mode: false Plugins: buildx: Docker Buildx (Docker Inc. Sep 19, 2023 · Docker architecture and components form the foundation of its containerization technology, enabling the efficient packaging, deployment, and management of applications. The Docker project as a whole, which is a platform for developers and sysadmins to develop, ship, and run applications; The docker daemon process running on the host which manages images and containers (also called Docker Engine) Docker Business: Docker Business is a Docker There are other times when you might need to configure systemd with Docker, such as configuring a HTTP or HTTPS proxy. 93 MB If you're new to Docker, this section guides you through the essential resources to get started. Docker Images are stored in the Docker Registry. While the output of docker ps provides you information about disk space consumed by a container's writable layer, it doesn't include information about metadata and log-files stored for each container. Apr 10, 2022 · Now available on Stack Overflow for Teams! AI features where you work: search, IDE, and chat. 73 kB 10. 1 kB / 7. Apr 11, 2024 · Docker Client . For more information on how to run containers on Windows Server, see Microsoft's official Mar 7, 2017 · Docker daemon is the brain behind the whole operation, like aws itself. Whenever you are creating an image you are using Docker Build. This step requires a Linux machine, and doesn't work on Docker Desktop, as it requires access to the Docker Daemon's file storage. Dec 27, 2023 · Tailor Docker functionality for development vs production. Running containers (and applications) with Docker implies running the Docker daemon. Oct 29, 2019 · This article serves as an introduction to the Docker containerization platform, including the Dockerfile, Docker images, Docker engines, and Docker containers. 2 Path: C:\Program Files\Docker\cli-plugins\docker-compose. So, these read-only templates are the building blocks of a Container. Docker Daemon (dockerd) or server is responsible for all the actions related to containers. 65 kB 10. The Docker daemon runs on the host operating system and manages Docker containers. 072 kB Step 1/2 : FROM microsoft/nanoserver ---> 22738ff49c6d Step 2/2 : COPY testfile. 10. Foundations of Docker. And much more! According to Docker‘s 2021 survey, over 75% of respondents modify their Docker daemon settings. Specify target type (--type) Oct 13, 2022 · Docker Engine API is a RESTful API that's used to interact with Docker daemon. Start the daemon manually. Let's dive into Docker's architecture and key components: 1. The Docker client and daemon communicate using a REST API, over UNIX sockets or a network interface. Use the Docker Engine CLI to create a swarm of Docker Engines where you can deploy application services. Docker Registry. Secure computing mode (seccomp) is a Linux kernel feature. A Docker daemon is also capable of communicating with other daemons in Nov 4, 2022 · When any docker commands runs, the client sends them to dockerd daemon, which carries them out. Docker CLI (Client): This is the main way that Docker users interact with What is Docker daemon? Docker daemon runs on the host operating system. After you select enter, the Docker CLI will send the run command and any command-line arguments to the Docker daemon via REST API call. To use the json-file driver as the default logging driver, set the log-driver and log-opts keys to appropriate values in the daemon. The Docker Daemon runs on the host machine, but as a user, you never communicate directly with the Daemon. Docker architecture. : Instructs Docker to build our web server from the current directory. If you are behind an HTTP proxy server, for example in corporate settings, you may have to configure the Docker daemon to use the proxy server for operations such as pulling and pushing images. yml start. ) Version: v2. exe not PowerShell): sc config docker binpath= "\"C:\Program Files\docker\dockerd. 2. Docker client can communicate with more than one daemon. May 15, 2024 · Explanation of the Docker Compose File – version: ‘3. 61 % 38. The Docker daemon is what actually executes commands sent to the Docker Client — like building, running, and distributing your containers. Set up Docker Desktop; Run your first container; Build your first image; Publish your image on Docker Hub; Modules Aug 11, 2023 · Simple docker step by step how to run docker daemon with explanation Running Docker daemon involves a series of steps for effective container management during development. Simple docker step by step how to restart docker daemon with explanation Restarting your Docker daemon can help solve problems and ensure optimal performance. This tracks everything related to Docker, including containers, images, volumes, service definition, and secrets. It currently only runs on Linux because it depends on a number of Linux kernel features, but there are a few ways to run Docker on MacOS and Windows too. A command-line interface (CLI) client (the docker command). Simple docker step by step how to start docker daemon linux with explanation Docker enhances the process of packaging and distributing software, making it an integral part of many DevOps pipelines. It greatly simplifies how you manage container Finally, you will explore how to publish your image on Docker Hub, enabling you to share your work with the broader community and leverage Docker's powerful ecosystem for collaborative development and deployment. 6 MB / 3. Simple docker step by step how to check if docker daemon is running with explanation Docker has definitely changed the world by making it possible for developers to package applications into containers. nanoseconds], where seconds is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (aka Unix epoch or Unix Oct 27, 2017 · To control the virtual machine, you use the docker-machine command. There is also the docker-machine env command which will set the environment variables needed for docker to work. Using this method, Docker Engine flags are set directly on the Docker service. Go's text/template package describes all the details of the format. json on Windows Server. A Dockerfile is a text file containing instructions for building your source code. Apr 11, 2024 · Docker daemon, also known as Dockerd, is a crucial element of the Docker platform. A daemon can also communicate with The Docker daemon attempts to identify naming conflicts but this is not guaranteed. Run Docker in high availability mode across nodes. It also provides a quick snapshot of the differences in file formats, command-line syntax, and top-level elements. Docker Engine Jul 2, 2024 · A server is a long-running program called a daemon process (the dockerd command). Simple docker step by step how to start docker daemon with explanation Starting and using Docker daemon can significantly streamline your containerization activities. Apr 18, 2019 · The Server runs a daemon known as dockerd (Docker Daemon), which is nothing but a process. Simple docker step by step how to start docker daemon mac with explanation Running Docker daemon on your Mac OS X operating system is easier than you might think. Linux Containers rely on control groups which not only track groups of processes, but also expose metrics about CPU, memory, and block I/O usage. Docker API makes networks and volumes possible and manages user permissions and access. Introduction. json or a -H flag when starting Docker manually, Docker fails to start. Prerequisites Firewall limitations. and -d to run the daemon in the By default, the builder clones the latest commit on the default branch of the repository that you specify. The Docker daemon persists all data in a single directory. 2. The Docker client contacted the Docker daemon. Each network also has a default subnet mask and gateway. Docker Daemon is a process or service that is running in the backend. When you use the Docker CLI to pass a command, the Docker client sends the command to the Docker daemon Apr 18, 2019 · Docker Images and Docker Containers are the two essential things that you will come across daily while working with Docker. json? daemon. Aug 11, 2023 · start docker daemon mac. However, before you begin working with these containers, it’s important to ensure that the Docker daemon May 16, 2023 · With the Docker API, you can tell the Docker daemon to perform tasks like starting, stopping and deleting containers or downloading or uploading Docker images. If you specify the -L option, docker cp follows any symbolic link in the SRC_PATH. Build is a key part of your software development life cycle allowing you to package and bundle your code and ship it anywhere. Refer to the Docker Desktop manual if you are running Docker Desktop. By default, the docker Jul 8, 2024 · Start or Run Docker Daemon – FAQs What is the Docker daemon, and why is it important? A Docker daemon (docker) is a background service that manages Docker objects: images, containers, networks, and volumes. 4. Docker Engine: Docker Engine is the core product of Docker, which includes its daemon and CLI. To use a containerd shim, install the shim binary on PATH on the system where the Docker daemon is running. Compose can also run in the background as a daemon when launched with the -d option: docker-compose up -d 7. Docker Engine is an open source containerization technology for building and containerizing your applications. 4 Path: C:\Program Files\Docker\cli-plugins\docker-buildx. Learn more Explore Teams containerd shims let you use alternative runtimes without having to change the configuration of the Docker daemon. Putting it all together, docker kill $(docker ps -q) stops all running Docker containers by obtaining their IDs from the output of docker ps -q and then using docker kill to send the stop signal to each identified container. Another Docker client is Docker Compose, that lets you work with applications consisting of a set of containers. What is daemon. Dec 16, 2020 · The Docker daemon constantly listens for Docker API requests and processes them. Examples Proxy configuration. You can use it to restrict the actions available within the container. By default this directory is: /var/lib/docker on Linux. 42 MB / 6. If you don't want to use a system utility to manage the Docker daemon, or just want to test things out, you can manually run it using the dockerd command. C:\ProgramData\docker on Windows. The user is added to the docker group. If you wish to implement your own version of the Compose Specification, see the Compose Specification repository . For more advanced concepts and scenarios in Docker, see Guides. It is used to carry out all the heavy tasks such as creating and managing Docker objects including containers, volumes, images, and networks. Docker does not allow these headers to change any headers it sets for itself. For more about configuring Docker using daemon. See full list on howtogeek. Learn how to build and share a containerized app. Reload to refresh your session. json file, which is located in /etc/docker/ on Linux hosts or C:\ProgramData\docker\config\daemon. This will impact the security of your system; the docker group is root equivalent. Understanding Docker Daemon. 🚀 Ready for a deep dive?- Check To use the journald driver as the default logging driver, set the log-driver and log-opts keys to appropriate values in the daemon. This is because by default a container is not allowed to access any devices, but a "privileged" container is given access to all devices (see the documentation on cgroups devices). exe\" --run-service -H tcp://0. 17. Feb 16, 2024 · Learn the key functions, architecture, and configuration of Docker daemon, the service that orchestrates container lifecycle management. always: Always restart the container regardless of the exit status. You can append URL fragments to the Git repository address to make the builder clone a specific branch, tag, and subdirectory of a repository. Mar 27, 2024 · How Docker interacts with containerd. It all starts with a Dockerfile. So, when you use a command like docker build, you're using Docker client, which in turn leverages Docker Engine API to communicate with Docker daemon. The seccomp() system call operates on the seccomp state of the calling process. Docker: The term Docker can refer to. Changing the storage driver makes any containers you have already created inaccessible on the local system. It can be a public docker registry or a private docker registry. To use a shim with docker run, specify the fully qualified name of the runtime as the value to the --runtime flag:. The Docker Client can run on the host machine as well, but it’s not required to Docker Compose is a tool for defining and running multi-container applications. Often, you might face certain issues with Docker, which can usually be fixed by Apr 25, 2023 · The common commands which are used by clients are docker build, docker pull, and docker run. Docker Registries. Running docker stats on all running containers against a Windows daemon. It hosts the Docker containers, images, and network. Docker CLI: A command line interface client for interacting with the Docker daemon. Docker builds images by reading the instructions from a Dockerfile. The simple but annoying solution is to run sudo service docker start whenever you want to use Docker. When you specify always, the Docker daemon tries to restart the container indefinitely. For example docker-machine start to start the machine after you reboot your computer, or docker-machine stop to shut it down. Nov 11, 2022 · Docker Host: The Docker daemon/Host also known asdockerdlistens for Docker client requests and manages Docker objects such as images, containers, and volumes. All the docker images are stored in the docker registry. Sending build context to Docker daemon 3. You switched accounts on another tab or window. For instructions on configuring Docker Desktop to use HTTP/HTTPS proxies, see proxies on Mac, proxies on Windows, and proxies on Linux. It is the key to unlocking a streamlined and efficient development and deployment experience. unless-stopped: Restart the container unless it's explicitly stopped or Docker itself is stopped or restarted. One hiccup with docker in WSL2 is that it doesn't automatically start the Docker service. See Docker Daemon Attack Surface for details. json, see daemon. First of all, only trusted users should be allowed to control your Docker daemon. Docker Engine: Docker engine is a client/server application consisting of the Docker daemon, a Docker API that interacts with the daemon, and a command-line interface (CLI) that talks to the daemon. Docker provides a software platform that allows you to automate the deployment, scaling, and management The daemon command description and usage. 26 MiB 15. Check the bottom line of it's output To generate this message, Docker took the following steps: 1. Overlay network limitations. Docker daemon communicates with other daemons. Also known as Docker Compose. docker login requires you to use sudo or be root, except when: Connecting to a remote daemon, such as a docker-machine provisioned docker engine. Follow the guides to help you get started and learn how Docker can optimize your development workflows. Here is a step-by-step guideline on how to achieve it. Run the following command in a command prompt (cmd. APIs which specify interfaces that programs can use to talk to and instruct the Docker daemon. This article will provide a simple, step-by-step tutorial on how to accomplish this task. With the help of REST API over a UNIX socket or a network, the docker client and daemon interact with each other. 0. C:\> docker info Client: Docker Engine - Community Version: 24. Docker doesn't try to interpret or understand these headers; it simply puts them into the messages. txt c:\RUN dir c: GetFileAttributesEx c:RUN: The system cannot find the file specified. It operates as a background service on the host machine, acting as a mediator between the Docker client and the Docker engine. 2 kB / 7. Docker client (called docker) is the command line interface used for interacting with Docker daemon. It receives the requests of the Docker API and processes them to build, run, and manage Docker containers. Docker Engine REST API: An API used by applications to interact with the Docker daemon; it can be accessed by an HTTP client. The Docker daemon created a new container from that image which runs the # executable that produces the output you are currently reading. The following section describes how to install the Docker daemon on Windows Server which allows you to run Windows containers only. Apr 8, 2024 · The Docker client and daemon communicate, making it a versatile tool for controlling multiple Docker environments. If you're running Docker Engine without Docker Desktop, refer to Configure the Docker daemon to use a proxy to learn how to configure a proxy server for the Docker daemon (dockerd) itself. 🔍 The Docker Daemon, also known as dockerd, is a persistent background process that manages Docker objects, such as images, containers, volumes, networks, and more. Docker client can be on the same host as a daemon or present on any other host. – build: . Feature highlights Cluster management integrated with Docker Engine. The Docker daemon is a service that runs on your host operating system. If you want Docker to start at boot, see Configure Docker to start on boot. What is Docker Daemon ? Docker daemon is a persistent background process that manages Docker The Docker daemon performs dynamic subnetting and IP address allocation for containers. Without the Docker API, communicating Aug 11, 2023 · start docker daemon. Docker Build is more than a command for building images, and it's not only about packaging your code. 3 MB 3f214c61ad1d 0. However, if you specify the -a option, docker cp sets the ownership to the user and primary group at the source. ) Version: v0. Docker Daemon: The Docker daemon is at the core of Docker's architecture. Docker Host. URL fragments. Aug 13, 2024 · Docker Daemon; The Docker daemon, also known as ‘dockerd’, consistently listens to the requests put forward by the Docker API. Jan 25, 2022 · What is a Docker Daemon? Docker has a client-server architecture. Command Description; docker config create: Create a config from a file or STDIN docker config inspect: Display detailed information on one or more configs Oct 3, 2022 · The Docker daemon is a service that runs on your host operating system. When providing Unix timestamps enter seconds[. In a nutshell, Docker daemon (also called Dockerd) is a persistent Aug 11, 2023 · restart docker daemon. The daemon receives the commands from the Docker client through CLI or REST API. 21 MiB 17. Warning. It acts as the intermediary between the Docker client and the Docker API, handling various tasks involved in container management. Aug 7, 2024 · The Docker client runs with the daemon on the same system or we can connect the Docker client with the Docker daemon remotely. A Docker container image is a lightweight, standalone, executable package of software that includes everything needed to run an application: code, runtime, system tools, system libraries and settings. Docker uses a client-server interaction that is fundamental to Docker’s design, providing a user-friendly interface to the powerful capabilities of the Docker daemon. Install Docker and jump into discovering what Docker is. 18 or later, and fuse-overlayfs is installed) Docker only supports Docker Desktop on Windows for those versions of Windows that are still within Microsoft’s servicing timeline. Feb 13, 2023 · Learn how Docker uses a client-server architecture to build, run, and manage containers. (amd64) 3. exe compose: Docker Compose (Docker Inc. 8’: We’re using Docker Compose version 3. 11 or later, or Ubuntu-flavored kernel); fuse-overlayfs (only if running with kernel 4. The Docker Daemon running within Docker Host is responsible for the images and containers. Here’s a simple tutorial on how to start a Docker daemon. efzfikt gpumv tddg aryjke cuocm wqxdbo fames nnd kdtdx rnpnmsg