Yum install -y yum-utils device-mapper-persistent-data lvm2Īfter that, we will have the latest stable packages from docker-ce repository.I’ve been helping a team to improve its Continuous Delivery pipeline and as part of this work, we’re introducing BDD-style test automation using Serenity. Install Docker-CEįirst we need to install yum-utils in order to install Docker-CE repository andĭevicemapper because it is use by Docker storage driver.
Yum remove docker docker-common docker-selinux docker-engineĭon’t worry if you have images, volumes or any data in your existing docker installation it will be preserve anyway. The service we are deploying is a Apache Server. Because of Docker Swarm nature it will Load Balance all applications within all cluster nodes. We recommend to run nodes with at least 4GB of RAM. We will perform a simple deployment with 1 Manager node and 2 Worker(Compute) nodes. We will be talking about the installation of Docker Swarm Cluster in CentOS 7 and how to deploy our first service and replicated along the cluster.
Cluster management integrated with Docker Engine.
This gives a significant performance boost and reduces the size of the application. But unlike a virtual machine, rather than creating a whole virtual operating system, Docker allows applications to use the same Linux kernel as the system that they’re running on and only requires applications be shipped with things not already running on the host computer. In a way, Docker is a bit like a virtual machine. By doing so, thanks to the container, the developer can rest assured that the application will run on any other Linux machine regardless of any customized settings that machine might have that could differ from the machine used for writing and testing the code. Containers allow a developer to package up an application with all of the parts it needs, such as libraries and other dependencies, and ship it all out as one package. Docker is a tool designed to make it easier to create, deploy, and run applications by using containers.
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