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Docker Overview

Overview

Docker is the organization driving the container movement and the sole container platform provider to address every application over the hybrid cloud. Today's businesses are under great pressure to digitally transform but are controlled by existing applications and infrastructure though rationalizing an ever more diverse portfolio of clouds, datacenters and application architectures. Docker enables right freedom among applications and infrastructure and developers and IT ops to unlock their prospective and creates a product for better collaboration and innovation.

A little intro to LXC: -

LXC (LinuX Containers) is a OS-level virtualization technology that allows creation and running of multiple isolated Linux virtual environments (VE) about the same control host. These isolation levels or containers can be used to either sandbox specific applications, or even to emulate a completely new host. LXC uses Linux's cgroups functionality, that has been introduced in version 2.6.24 to allow the host CPU to higher partition memory portion into remoteness levels called namespaces. Note that a VE is distinct from an electronic machine (VM), as we will see below.

Docker, previously called dotCloud, was started as a part project and only open-sourced in 2013. It is really an extension of LXC's capabilities. This it achieves employing a high-level API that gives a light virtualization solution to perform processes in isolation. Since it's based on LXC, a Docker container does not consist of a separate operating-system, instead it utilizes the operating systems own functionality as supplied by the underlying infrastructure. So Docker acts as a portable container engine, packaging the application and all its dependencies in an electronic container that will operate on any Linux server.

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What's a Container?

A container image is a lightweight, stand-alone, executable wrap up of a software program which includes all required to perform it: code, runtime, system tools, system libraries, settings. Designed for Linux and Windows based apps, containerized software will always run exactly the same. Containers isolate software from its surroundings, for instance differences among development and staging environments and lessen conflicts among teams running different software for a passing fancy infrastructure.

LIGHTWEIGHT

Docker containers running about the same machine share that machine's operating-system kernel; they start instantly and use less compute and RAM. Images are made out of filesystem layers and share common files. This minimizes disk usage and image downloads are much sooner.

STANDARD

Docker containers draw from from open standards and operate on all major Linux distributions, Microsoft Windows, and on at all infrastructure with VMs, bare-metal and in the cloud.

SECURE

Docker containers separate applications from one another and from the core infrastructure. Docker offers the strongest default isolation to limit app issues to a single container rather than the entire machine.

Advantages:

Modern App Platform

The Docker platform is the sole container platform to create, secure and manage the widest array of applications from development to production both on-premises and in the cloud. Docker Community Edition [CE] empowers developers with tools to create applications and Docker Enterprise Edition [EE] provides IT with multi-architecture operations at scale. Docker delivers both a motor for innovation that modernizes without disruption while reducing total costs by significantly more than 50%. Unlike other solutions that specialize in a thin slice of the enterprise IT portfolio, Docker delivers operations at scale by addressing a varied pair of applications and infrastructure for both developers and IT.

Simplicity

Docker makes potent tools for application creation and orchestration, available to everybody.

Openness

Built with open source technology and a modular design allows you to integrate into your existing environment.

Independence

Docker creates a partition of concerns among developers and IT and among applications and infrastructure to unlock innovation.

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Introduction to AWS CloudWatch

Introduction

Amazon CloudWatch is just a component of Amazon Web Services (AWS) that gives monitoring for AWS resources and the consumer applications running on the AWS instances. It allows real time monitoring of AWS resources like AWS EBS, AWS EC2 Instances, AWS RDS etc. In addition it provides matrices for CPU utilization, latency, and other useful parameters. It's used in order to be sure that all of the resources as well the applications work underneath the threshold limit. Once the defined threshold limit changes CloudWatch alarms sends the notification or automatically makes the changes to the resources as the guidelines defined by you. Users can access CloudWatch functions using an API, command-line tools or the AWS Management Console. The CloudWatch interface provides present statistics which can be viewed in graph format.

Amazon CloudWatch Features

The cloudwatch provides some useful features the following:

Collect

Monitor

Act

Analyze

Security

Collect

The Amazon CloudWatch simply collect and store logs i.e. it allows to collect and store logs from your resources, applications, and services in near real-time.

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In adding together it allows you to collect default metrics from AWS services, such as Amazon EC2, Amazon RDS, Amazon S3, AWS Lambda etc lacking the action on your own part.

In addition it allows you to collect custom metrics from your own personal applications to monitor operational performance, troubleshoot issues, and spot trends

Monitor

Amazon CloudWatch dashboards enable you to produce re-usable graphs and visualize your cloud resources and applications in a specific view. Can visualize key metrics, like CPU utilization and memory, and evaluate them to capacity.

Amazon CloudWatch also allows to correlate metrics and logs. This helps you quickly go from diagnosing the issue toward understanding the main cause.

Act

It Supports Auto Scaling. Auto Scaling can help you computerize capacity and resource planning. You can set a entry to alarm on a key metric and trigger an automated Auto Scaling action. Like, you might set up an Auto Scaling workflow to include or remove EC2 instances centered on CPU utilization metrics and optimize resource costs.

Cloud watch allows you to react promptly to operational changes and take corrective action.

Analyze

Amazon CloudWatch allows you to check trends and seasonality with 15 months of metric data. This data allows to perform historical analysis to fine-tune resource utilization.

Security

Amazon CloudWatch is integrated with AWS Identity and Access Management (IAM) so you can control which users and resources have permission to get into your computer data and how they could access it.

Amazon CloudWatch Concepts

Metrics

Metrics are the fundamental concept in CloudWatch. A full represents a time-ordered pair of data points that are published to CloudWatch. Think of a full as a variable to monitor, and the information points represent the values of this variable over time.

Namespaces

A namespace is a box for CloudWatch metrics. Metrics in various namespaces are isolated from each other, so that metrics from different applications aren't incorrectly aggregated into the same statistics.

Dimensions

A dimension is just a name/value pair that uniquely identifies a metric. You can allot up to 10 dimensions to a metric.

Statistics

Statistics are metric data aggregations over particular periods of time. CloudWatch provides statistics based on the metric data points supplied by your custom data or supplied by other AWS services to CloudWatch. Aggregations are made utilizing the namespace, metric name, dimensions, and the information point unit of measure, within the timeframe you specify.

Alarm

You can use an alarm to automatically initiate actions on your own behalf. An alarm watches just one metric over a particular time frame, and performs more than one specified actions, based on the value of the metric in unity with a threshold over time.

Amazon CloudWatch Pricing

As most of us realize that while working together with Amazon web services, the main problem we always used to access learn about may be the pricing and billing for using them.

With Amazon CloudWatch, there's no up-front commitment or minimum fee. i.e. you simply purchase everything you use. You is likely to be charged at the end of the month for your usage.

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