Docker Online Training | Kubernetes Online Training

1. Docker - Orchestrating Containers using Swarm Docker Swarm Docker Swarm is a clustering and a planning tool for Docker Containers. Swarm mode also exists natively for Docker Engine, the layer between the operating system and container images.

2. Why do we want a container orchestration system? imagine that you had to run hundreds of containers. You can easily see that if they are running in a distributed model, there are several features that you will need from a management perspective to make sure the cluster is operational, healthy and more. Some of these necessary features include: Health checks on containers Launch of a fixed set of containers for a specific Docker image Scaling of the number of containers from top to bottom depending on the load Perform a continuous software update on multiple containers Clustering - Clustering is an important feature of Container technology because it creates a cooperative group of systems that can provide redundancy, allowing Docker Swarm failover if one or more nodes fail. What Swarm Offers - A Docker Swarm cluster also offers administrators and developers the ability to add or subtract container iterations as IT demands to evolve. Swarm manager - An IT administrator controls Swarm via a swarm manager, which orchestrates and schedules the containers. The swarm manager allows a user to create a primary manager instance and multiple replica instances if the primary instance fails. In Docker Engine Swarm mode, the user can deploy manager and work nodes at runtime. This allows multiple machines running Docker Engine to participate in a cluster, called swarm. Docker motors contributing to a swarm are expected to operate in swarm mode. The machines enter Swarm mode by initializing a new swarm or joining an existing swarm.

3. Manager Node - The manager node performs the management and orchestration of the cluster while the worker nodes perform the tasks allocated by the manager. Node - A Docker engine participating in the swarm is called a node. A node can be a manager node or a worker node. A node is an instance in the Docker engine participating in the swarm. A manager node itself, unless otherwise configured, is also a worker node. Service - The central entity of the Docker Swarm infrastructure is called service. A Docker swarm performs the services. The user submits a service to the manager node to deploy and run. Task - A service is made up of many tasks. A task is the most basic unit of work in a swarm. A task is allocated to each work node b the manager node. Services can be scaled at run time to handle the additional load. The swarm manager natively supports internal load balancing to distribute tasks among the participating work nodes. In addition, the manager supports input load balancing to control the exposure of Docker services to the outside world. The manager node also supports service discovery by automatically assigning a DNS entry to each service. For More Information about Docker & Kubernetes Online Training ClickHere Ph No: +91-9989971070, E-Mail ID: online@visualpath.in