Swarm Service Service is the definition of the tasks to execute on the worker nodes. It is the central structure of the swarm system and the primary root of user interaction with the swarm. When you create a service, you specify which container image to use and which commands to execute inside running containers. Running …

Docker Swarm Swarm is native clustering for the Docker. When the Docker Engine runs is swarm mode, manager nodes implement the Raft Consensus Algorithm to manage the global cluster state. The reason why Docker swarm mode is using a consensus algorithm is to make sure that all the manager nodes that are in charge of …

Docker Swarm Swarm is native clustering for the Docker. in the context of swarm, a cluster is a poll of Docker hosts that acts as a bit like a single large docker host. You can also run swarm services and standalone containers on the same Docker instances. Features of Swarm Swarm setup is very quick …

Docker Image Docker image can be described as a template with all required configurations Whereas a container is a  running instance of Docker image. Like containers, image are not bound to the states i.e. Image does not have states. There are different images available from the OS/Application vendor along with the custom images from the …

  Why to use custom Network Subnet for Docker Networking? Docker container makes use of default subnet “172.17.0.0/16” for Networking. There may be many scenarios where we can’t use the default network due to some restrictions or in case subnet already used in the network.   Lab Tasks In this quick session, we will change …

What is Docker? Docker is an open platform for developers and system engineers to build, ship, and run distributed applications, whether on Bare Metal System (Physical), VMs, or the Cloud, Docker is not a container technology like Xen/KVM etc. Docker provides an additional layer abstraction and automation of operating system I virtualization on Linux. Advantages …

Introduction

netstat (network statistics) is a command line tool for monitoring network connections both incoming and outgoing as well as viewing routing tables, interface statistics etc. netstat is available on all Unix-like Operating Systems and also available on Windows OS as well. It is very useful in terms of network troubleshooting and performance measurement. netstat is one of the most basic network service debugging tools, telling you what ports are open and whether any programs are listening on ports.

Introduction The step by step command example below show the process of using SMART disk monitoring tool that provide us with the information of overall hard disk health status. The SMART it self stand for Self Monitoring Analysis and Reporting Tool and on Linux, the smartctl command is use to display and manipulate SMART. The …

  I came across Pushover recently which makes it easy to send real-time notifications to your Android and iOS devices. And easy it is. It also allows you to set up applications with logos so that you can have multiple Nagios installations shunting alerts to you via Pushover with each one easily identifiable. After just …

Introduction CentOS 7 comes with services which saves logging information. Some services write their own logs directly to their log information files, e.g. apache maintain their own logs. Some of the service maintain their logs through systemctl. Systemctl is a services that take care of starting, stopping or monitoring the status of a process. systemctl …