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Docker Swarm & Machine
The document provides an overview of Docker Swarm and Docker Machine, highlighting their functionality in container clustering and management. It explains the Docker architecture, including the client-server model, and details the installation and use of Docker Machine for provisioning Docker hosts. Docker Swarm enables multiple Docker hosts to function as a single virtual host, supporting the standard Docker API for easier scalability and management.
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Docker Swarm & Machine
- 1. Docker Swarm +Machine Docker - Container Clustering Eueung Mulyana http://eueung.github.io/docker-stuff/swarm CodeLabs | Attribution-ShareAlike CC BY-SA 1 / 31
- 2. Outline Docker Engine -Revisited Docker Machine Docker Swarm 2 / 31
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- 4. Docker Engine When peoplesay "Docker" they typically mean Docker Engine, the client-server application made up of the Docker daemon, a REST API that speci es interfaces for interacting with the daemon, and a command line interface (CLI) client that talks to the daemon (through the REST API wrapper). Docker Engine accepts docker commands from the CLI, such as dockerrun<image>, dockerpsto list running containers, dockerimagesto list images, and so on. Engine is the core of Docker and nothing else will run without it. Ref: docker.com 4 / 31
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- 6. Docker daemon The Dockerdaemon runs on a host machine. The user does not directly interact with the daemon, but instead through the Docker client. Docker client The Docker client, in the form of the docker binary, is the primary user interface to Docker. It accepts commands from the user and communicates back and forth with a Docker daemon. Ref: docker.com 6 / 31 Docker Architecture Docker uses a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing your Docker containers. Both the Docker client and the daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. The Docker client and daemon communicate via sockets or through a RESTful API.
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- 9. Docker Machine isa tool for provisioning and managing your Dockerized hosts (hosts with Docker Engine on them). Typically, you install Docker Machine on your local system. Docker Machine has its own command line client docker-machineand the Docker Engine client, docker. You can use Machine to install Docker Engine on one or more virtual systems. These virtual systems can be local (as when you use Machine to install and run Docker Engine in VirtualBox on Mac or Windows) or remote (as when you use Machine to provision Dockerized hosts on cloud providers). The Dockerized hosts themselves can be thought of, and are sometimes referred to as, managed "machines". Using docker-machinecommands, you can start, inspect, stop, and restart a managed host, upgrade the Docker client and daemon, and con gure a Docker client to talk to your host. Point the Machine CLI at a running, managed host, and you can run docker commands directly on that host. For example, run docker-machineenvdefaultto point to a host called default, follow on-screen instructions to complete env setup, and run dockerps, dockerrunhello-world, and so forth. 9 / 31 Docker Machine vs. Docker Engine Ref: Machine Overview
- 10. Docker Machine 10 /31 Install and run Docker on Mac or Windows Provision and manage multiple remote Docker hosts Provision Swarm clusters
- 11. Let's Try It... 11 / 31
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- 14. Connect $docker-machineenvdefault exportDOCKER_TLS_VERIFY="1" exportDOCKER_HOST="tcp://192.168.99.100:2376" exportDOCKER_CERT_PATH="/home/em/.docker/machine/machines/default" exportDOCKER_MACHINE_NAME="default" #Runthiscommandtoconfigureyourshell: #eval$(docker-machineenvdefault) $eval$(docker-machineenvdefault) $dockerimages REPOSITORY TAG IMAGEIDCREATED SIZE $env|grepDOCKER DOCKER_HOST=tcp://192.168.99.100:2376 DOCKER_MACHINE_NAME=default DOCKER_TLS_VERIFY=1 DOCKER_CERT_PATH=/home/em/.docker/machine/machines/default $docker-machinels NAME ACTIVE DRIVER STATE URL SWARM DOCKER default * virtualbox Running tcp://192.168.99.100:2376 v1.11.1 14 / 31
- 15. Work $dockerrunbusyboxechohelloworld Unabletofindimage'busybox:latest'locally latest:Pullingfromlibrary/busybox...385e281300cc:Pullcomplete...a3ed95caeb02:P Digest:sha256:4a887a2326ec9e0fa90cce7b4764b0e627b5d6afcb81a3f73c85dc29cea00048 Status:Downloadednewerimageforbusybox:latest helloworld $dockerimages REPOSITORY TAG IMAGEIDCREATED SIZE busybox latest 47bcc53f74dc 6weeksago 1.113 $docker-machineipdefault 192.168.99.100 $dockerps-a CONTAINERID IMAGE COMMAND CREATED STATUS 0fb8afca05ea busybox "echohelloworld" 2minutesago Exited $dockerrun-d-p8000:80nginx Unabletofindimage'nginx:latest'locally latest:Pullingfromlibrary/nginx efd26ecc9548:Pullcomplete...8ddc2d7beb91:Pullcomplete Digest:sha256:2ca2638e55319b7bc0c7d028209ea69b1368e95b01383e66dfe7e4f43780926d Status:Downloadednewerimagefornginx:latest a8eb8f257cc1a747ff5bd30c056fcf5fe173de8fb0781265eed595ab7cd69b40 $dockerps CONTAINERID IMAGE COMMAND CREATED STA a8eb8f257cc1 nginx "nginx-g'daemonoff" 10secondsago Up 15 / 31
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- 17. Work #or $curl$(docker-machineipdefault):8000 $docker-machinestop Stopping"default"... Machine"default"wasstopped. #withoutexplicitname->default $env|grepDOCKER DOCKER_HOST=tcp://192.168.99.100:2376 DOCKER_MACHINE_NAME=default DOCKER_TLS_VERIFY=1 DOCKER_CERT_PATH=/home/em/.docker/machine/machines/default $dockerimages Anerroroccurredtryingtoconnect:Gethttps://192.168.99.100:2376/v1.23/images/json: $eval$(docker-machineenv-u) $env|grepDOCKER $dockerimages REPOSITORY TAG IMAGEIDCREATED composetest_web latest e7d62ba30c20 4daysago web latest d6f25a9bf632 4daysago redis latest 9a450ae418d8 4daysago 17 / 31
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- 19. Docker Swarm isnative clustering for Docker. It turns a pool of Docker hosts into a single, virtual Docker host. Because Docker Swarm serves the standard Docker API, any tool that already communicates with a Docker daemon can use Swarm to transparently scale to multiple hosts. 19 / 31 Docker Swarm Ref: Mike Goelzer, Swarm: Docker Native Clustering, Swarm Overview
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- 22. Back to Console... 22 / 31
- 23. $docker-machinecreate-dvirtualboxmanager $docker-machinecreate-dvirtualboxagent1 $docker-machinecreate-dvirtualboxagent2 $docker-machinels NAME ACTIVE DRIVERSTATE URL SWARM DOCKER agent1 - virtualbox Running tcp://192.168.99.101:2376 v1.11.1 agent2 - virtualbox Running tcp://192.168.99.102:2376 v1.11.1 default - virtualbox Stopped Unknown manager - virtualbox Running tcp://192.168.99.100:2376 v1.11.1 23 / 31 Create Nodes
- 24. $eval$(docker-machineenvmanager) $dockerrun--rmswarmcreate Unabletofindimage'swarm:latest'locally latest:Pullingfromlibrary/swarm dd2ca02feeef:Pullcomplete...a3ed95caeb02:Pullcomplete Digest:sha256:69363272443f4080e0623e78ced41bf38273535ee7f422b26bbc555db2b5d4a4 Status:Downloadednewerimageforswarm:latest 323517cd62f3b9697152e09bdcfe8714 $dockerps CONTAINERID IMAGE COMMANDCREATED STATUS $dockerimages REPOSITORY TAG IMAGEID CREATED SIZE swarm latest 47dc182ea74b 32hoursago 19.32 $dockerrun-d-p3376:3376-t-v/var/lib/boot2docker:/certs:roswarmmanage-H0.0. 20824649fd03351da2f8b77270332c2d94983664a7a2733a776d48b64b409655 24 / 31 Run Swarm Manager
- 25. In this case,we are using the discovery backend hosted on Docker Hub to create a unique discovery token for the cluster. This discovery backend is only for low-volume development and testing purposes. The discovery backend maintains an up-to- date list of cluster members and shares that list with the Swarm manager. The Swarm manager uses this list to assign tasks to the nodes. 25 / 31 Swarm Discovery Token
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- 28. $dockerrunhello-world HellofromDocker. ... $dockerps-a CONTAINERID IMAGE COMMANDCREATED STA 81ea366b46e5 hello-world "/hello" 18secondsago Exi abbfbcc8de62 swarm "/swarmjoin--addr=1" 20minutesago Up 2f929cdff3e9 swarm "/swarmjoin--addr=1" 22minutesago Up 28 / 31 Use Swarm
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- 30. Refs 1. Machine Overview 2.Get started with a local VM 3. Swarm Overview 4. Evaluate Swarm in a sandbox 5. Mike Goelzer, Swarm: Docker Native Clustering 6. Docker Machine - Reference env 30 / 31
- 31. END Eueung Mulyana http://eueung.github.io/docker-stuff/swarm CodeLabs |Attribution-ShareAlike CC BY-SA 31 / 31