Runtime metrics Docker stats You can use the docker stats command to live stream a container’s runtime metrics. The command supports CPU, memory usage, memory limit, and network IO metrics. The following is a sample output from the docker stats command $ docker stats redis1 redis2 CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O redis1 0.07% 796 KB / 64 MB 1.21% 788 B / 648 B 3.5

Journald logging driver The journald logging driver sends container logs to the systemd journal. Log entries can be retrieved using the journalctl command, through use of the journal API, or using the docker logs command. In addition to the text of the log message itself, the journald log driver stores the following metadata in the journal with each message: Field Description CONTAINER_ID The container ID truncated to 12 characters. CONTAINER_ID_FULL The full 64-character container ID. CONTAINE

Customize the docker0 bridge The information in this section explains how to customize the Docker default bridge. This is a bridge network named bridge created automatically when you install Docker. Note: The Docker networks feature allows you to create user-defined networks in addition to the default bridge network. By default, the Docker server creates and configures the host system’s docker0 interface as an Ethernet bridge inside the Linux kernel that can pass packets back and forth between

port Usage: docker port [OPTIONS] CONTAINER [PRIVATE_PORT[/PROTO]] List port mappings for the CONTAINER, or lookup the public-facing port that is NAT-ed to the PRIVATE_PORT --help Print usage You can find out all the ports mapped by not specifying a PRIVATE_PORT, or just a specific mapping: $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES b650456536c7 busybo

Docker and OverlayFS in practice OverlayFS is a modern union filesystem that is similar to AUFS. In comparison to AUFS, OverlayFS: has a simpler design has been in the mainline Linux kernel since version 3.18 is potentially faster As a result, OverlayFS is rapidly gaining popularity in the Docker community and is seen by many as a natural successor to AUFS. As promising as OverlayFS is, it is still relatively young. Therefore caution should be taken before using it in production Docker enviro

Provision a Swarm cluster with Docker Machine You can use Docker Machine to provision a Docker Swarm cluster. Machine is the Docker provisioning tool. Machine provisions the hosts, installs Docker Engine on them, and then configures the Docker CLI client. With Machine’s Swarm options, you can also quickly configure a Swarm cluster as part of this provisioning. This page explains the commands you need to provision a basic Swarm cluster on a local Mac or Windows computer using Machine. Once you u

pause Usage: docker pause [OPTIONS] CONTAINER [CONTAINER...] Pause all processes within a container --help Print usage The docker pause command uses the cgroups freezer to suspend all processes in a container. Traditionally, when suspending a process the SIGSTOP signal is used, which is observable by the process being suspended. With the cgroups freezer the process is unaware, and unable to capture, that it is being suspended, and subsequently resumed. See the cgroups freezer docu

Frequently Asked Questions (FAQ) If you don’t see your question here, feel free to submit new ones to docs@docker.com. Or, you can fork the repo and contribute them yourself by editing the documentation sources. How much does Engine cost? Docker Engine is 100% free. It is open source, so you can use it without paying. What open source license are you using? We are using the Apache License Version 2.0, see it here: https://github.com/docker/docker/blob/master/LICENSE Does Docker run on Mac OS X

volume create Usage: docker volume create [OPTIONS] Create a volume -d, --driver=local Specify volume driver name --help Print usage --label=[] Set metadata for a volume --name= Specify volume name -o, --opt=map[] Set driver specific options Creates a new volume that containers can consume and store data in. If a name is not specified, Docker generates a random name. You create a volume and then configure the container to use it, for

Store images on Docker Hub So far you’ve learned how to use the command line to run Docker on your local host. You’ve learned how to pull down images to build containers from existing images and you’ve learned how to create your own images. Next, you’re going to learn how to use the Docker Hub to simplify and enhance your Docker workflows. The Docker Hub is a public registry maintained by Docker, Inc. It contains images you can download and use to build containers. It also provides authenticati