Guide to automating a multi-tiered application securely on AWS with Docker and Terraform

A technical guide for building a closed private network on AWS and establish a secure way to access network resources, using a trusted VPN

Source: Guide to automating a multi-tiered application securely on AWS with Docker and Terraform

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Convert Any Server to a Docker Container

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This post is based on material from Docker in Practice, available on Manning’s Early Access Program. Get 39% off with the code: 39miell

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How and Why?

Let’s say you have a server that has been lovingly hand-crafted that you want to containerize.

Figuring out exactly what software is required on there and what config files need adjustment would be quite a task, but fortunately blueprint exists as a solution to that.

What I’ve done here is automate that process down to a few simple steps. Here’s how it works:

Blueprint_Server

You kick off a ShutIt script (as root) that automates the bash interactions required to get a blueprint copy of your server, then this in turn kicks off another ShutIt script which creates a Docker container that provisions the container with the right stuff, then commits it. Got it? Don’t worry, it’s automated and…

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Service Discovery and Load balancing Internals in Docker 1.12

Sreenivas Makam's Blog

Docker 1.12 release has revamped its support for Service Discovery and Load balancing. Prior to 1.12 release, support for Service discovery and Load balancing was pretty primitive in Docker. In this blog, I have covered the internals of Service Discovery and Load balancing in Docker release 1.12. I will cover DNS based load balancing, VIP based load balancing and Routing mesh.

Technology used

Docker service discovery and load balancing uses iptables and ipvs features of Linux kernel. iptables is a packet filtering technology available in Linux kernel. iptables can be used to classify, modify and take decisions based on the packet content. ipvs is a transport level load balancer available in the Linux kernel.

Sample application

Following is the sample application used in this blog:

swarm1

“client” service has 1 client container task. “vote” service has multiple vote container tasks. Client service is used to access multi-container voting service. We will deploy…

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