Getting started with swarm mode Estimated reading time: 4 minutes This tutorial introduces you to the features of Docker Engine Swarm mode. You may want to familiarize yourself with the before you begin. The tutorial guides you through the following activities: • initializing a cluster of Docker Engines in swarm mode • adding nodes to the swarm • deploying application services to the swarm • managing the swarm once you have everything running This tutorial uses Docker Engine CLI commands entered on the command line of a terminal window. If you are brand new to Docker, see. Set up To run this tutorial, you need the following: • • • • Three networked host machines This tutorial requires three Linux hosts which have Docker installed and can communicate over a network. These can be physical machines, virtual machines, Amazon EC2 instances, or hosted in some other way. You can even use Docker Machine from a Linux, Mac, or Windows host. Check out for one possible set-up for the hosts. One of these machines is a manager (called manager1) and two of them are workers ( worker1 and worker2). Ncert philosophy book in hindi. Note: You can follow many of the tutorial steps to test single-node swarm as well, in which case you need only one host. Multi-node commands do not work, but you can initialize a swarm, create services, and scale them. You can use Docker for Mac or Windows to test single-node features of swarm mode, including initializing a swarm with a single node, creating services, and scaling services. Docker “Moby” on Hyperkit (Mac) or Hyper-V (Windows) serve as the single swarm node. You can test both single-node and multi-node swarm from this computer, but you will need to use Docker Machine to test the multi-node scenarios. * You can use Docker for Mac or Windows to test _single-node_ features of swarm: mode, including initializing a swarm with a single node, creating services, and scaling services. ![]() Docker Engine 1.12 or newer This tutorial requires Docker Engine 1.12 or newer on each of the host machines. Install Docker Engine and verify that the Docker Engine daemon is running on each of the machines. You can get the latest version of Docker Engine as follows: • • Install Docker Engine on Linux machines If you are using Linux based physical computers or cloud-provided computers as hosts, simply follow the for your platform. Spin up the three machines, and you are ready. You can test both single-node and multi-node swarm scenarios on Linux machines. Use Docker for Mac or Docker for Windows Alternatively, install the latest or application on one computer. You can test both single-node and multi-node swarm from this computer, but you need to use Docker Machine to test the multi-node scenarios. • You can use Docker for Mac or Windows to test single-node features of swarm mode, including initializing a swarm with a single node, creating services, and scaling services. Docker “Moby” on Hyperkit (Mac) or Hyper-V (Windows) serve as the single swarm node. • Currently, you cannot use Docker for Mac or Docker for Windows alone to test a multi-node swarm. However, you can use the included version of to create the swarm nodes (see ), then follow the tutorial for all multi-node features. For this scenario, you run commands from a Docker for Mac or Docker for Windows host, but that Docker host itself is not participating in the swarm. After you create the nodes, you can run all swarm commands as shown from the Mac terminal or Windows PowerShell with Docker for Mac or Docker for Windows running. The IP address of the manager machine The IP address must be assigned to a network interface available to the host operating system. All nodes in the swarm need to connect to the manager at the IP address.
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