Flocker is an open-source container data volume manager for your Dockerized applications.
Codefresh lets you instantly build and test Docker images and compositions.You can start by going to our Getting Started Guide or watching this short video on how to build your first Docker image.
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Docker >
Docker Days - Docker community blog from DBAref.com
Starting, stopping, restarting docker container
PS C:\Program Files\Docker Toolbox> docker start --help Usage: docker start [OPTIONS] CONTAINER [CONTAINER...] Start one or more stopped containers -a, --attach Attach STDOUT/STDERR and forward signals --detach-keys Override the key sequence for detaching a container --help Print usage -i, --interactive Attach container's STDIN PS C:\Program Files\Docker Toolbox> 2. docker stop <container name> PS C:\Program Files\Docker Toolbox> docker stop --help Usage: docker stop [OPTIONS] CONTAINER [CONTAINER...] Stop a running container. Sending SIGTERM and then SIGKILL after a grace period --help Print usage -t, --time=10 Seconds to wait for stop before killing it 3. docker start <container name> PS C:\Program Files\Docker Toolbox> docker restart --help Usage: docker restart [OPTIONS] CONTAINER [CONTAINER...] Restart a container --help Print usage -t, --time=10 Seconds to wait for stop before killing the container PS C:\Program Files\Docker Toolbox> |
Docker Elements
1. Docker Containers: Docker containers wrap up a piece of software in a complete file system that contains everything it needs to run: code, runtime, system tools, system libraries – anything you can install on a server. This guarantees that it will always run the same, regardless of the environment it is running in. A container is basically the actual directory on a computer which contains everything in the docker application which you are going to launch. A container is an active (or inactive if exited) stateful instantiation of an image. 2. Docker Images: Basically snapshot of a container which contains base operating systems and all iterative changes made. An image is an ordered collection of root file system changes and the corresponding execution parameters for use within a container runtime. Images are read-only. ======================================================================================== Images are frozen immutable snapshots of live containers. Containers are running (or stopped) instances of some image. Answering from a Java developer perspective, difference between a Docker Image and a Docker Container is the same as that of difference between a Java Class and an Object. In practice, Object is the runtime instance of a Class. Similarly, Container is the runtime instance of an Image. Object gets created only once it is instantiated. Similarly Container can be running or stopped. And containers are created out of an image. When using docker, we start with a base image. We boot it up, do changes and the changes are saved in layers forming another image. So eventually I have an image for my postgres and an image for my web app, changes to which keep on being persisted. Images are created with the build command, and they'll produce a container when started with run. Images are stored in a Docker registry such as registry.hub.docker.com. Because they can become quite large, images are designed to be composed of layers of other images, allowing a miminal amount of data to be sent when transferring images over the network. ======================================================================================== 3. Docker Files: Docker files are scripts that automates the build process for creating an image. Docker can build images automatically by reading the instructions from a Dockerfile. A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image. Using docker build users can create an automated build that executes several command-line instructions in succession. Best practices for writing Dockerfiles Docker can build images automatically by reading the instructions from a Dockerfile, a text file that contains all the commands, in order, needed to build a given image. Dockerfiles adhere to a specific format and use a specific set of instructions. You can learn the basics on the Dockerfile Reference page. If you’re new to writing Dockerfiles, you should start there. |
Docker parts
1. Docker Daemon: The Docker daemon is the persistent process that manages containers. Docker uses the same binary for both the daemon and client. 2. Docker CLI (command line interface): PS C:\Program Files\Docker Toolbox> docker Usage: docker [OPTIONS] COMMAND [arg...] docker daemon [ --help | ... ] docker [ --help | -v | --version ] A self-sufficient runtime for containers. Options: -b, --bridge Attach containers to a virtual switch --config=%USERPROFILE%\.docker Location of client config files -D, --debug Enable debug mode -H, --host=[] Daemon socket(s) to connect to -h, --help Print usage -l, --log-level=info Set the logging level --tls Use TLS; implied by --tlsverify --tlscacert=%USERPROFILE%\.docker\machine\machines\default\ca.pem Trust certs signed only by this CA --tlscert=%USERPROFILE%\.docker\machine\machines\default\cert.pem Path to TLS certificate file --tlskey=%USERPROFILE%\.docker\machine\machines\default\key.pem Path to TLS key file --tlsverify=true Use TLS and verify the remote -v, --version Print version information and quit Commands: 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 filesystem as a tar archive history Show the history of an image images List images import Import the contents from a tarball to create a filesystem image info Display system-wide information inspect Return low-level information on a container or image kill Kill a running container load Load an image from a tar archive or STDIN login Log in to a Docker registry logout Log out from a Docker registry logs Fetch the logs of a container network Manage Docker networks pause Pause all processes within a container port List port mappings or a specific mapping for the CONTAINER ps List containers pull Pull an image or a repository from a registry push Push an image or a repository to a registry rename Rename a container restart Restart a container rm Remove one or more containers rmi Remove one or more images run Run a command in a new container save Save one or more images to a tar archive search Search the Docker Hub for images start Start one or more stopped containers stats Display a live stream of container(s) resource usage statistics stop Stop a running container tag Tag an image into a repository top Display the running processes of a container unpause Unpause all processes within a container update Update configuration of one or more containers version Show the Docker version information volume Manage Docker volumes wait Block until a container stops, then print its exit code Run 'docker COMMAND --help' for more information on a command. PS C:\Program Files\Docker Toolbox> 3. Docker Image Index |
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