basic coverage for elastic beanstalk (#669)

* basic coverage for elastic beanstalk

README.md

@@ -43,6 +43,7 @@ Table of Contents
 | [ECS](#ecs) | [📗](#ecs-basics) | [📘](#ecs-tips) |  |
 | [EKS](#eks) | [📗](#eks-basics) | [📘](#eks-tips) | [📙](#eks-gotchas-limitations)  |
 | [EFS](#efs) | [📗](#efs-basics) | [📘](#efs-tips) | [📙](#efs-gotchas-and-limitations) |
+| [Elastic Beanstalk](#elastic-beanstalk) | [📗](#elastic-beanstalk-basics) | [📘](#elastic-beanstalk-tips) | [📙](#elastic-beanstalk-gotchas-and-limitations) |
 | [Elastic IPs](#elastic-ips) | [📗](#elastic-ip-basics) | [📘](#elastic-ip-tips) | [📙](#elastic-ip-gotchas-and-limitations) |
 | [ElastiCache](#elasticache) | [📗](#elasticache-basics) | [📘](#elasticache-tips) | [📙](#elasticache-gotchas-and-limitations) |
 | [EMR](#emr) | [📗](#emr-basics) | [📘](#emr-tips) | [📙](#emr-gotchas-and-limitations) |
@@ -873,7 +874,6 @@ EC2
 
 
 
-
 CloudWatch
 -------------------
 
@@ -1142,6 +1142,29 @@ ALB
 -	In a target group, if there is no healthy target, all requests are routed to all targets. For example, if you point a listener at a target group containing a single service that has a long initialization phase (during which the health checks would fail), requests will reach the service while it is still starting up.
 - 📜 Although ALBs [now support SNI](https://aws.amazon.com/about-aws/whats-new/2017/10/elastic-load-balancing-application-load-balancers-now-support-multiple-ssl-certificates-and-smart-certificate-selection-using-server-name-indication-sni/), they only support 25 HTTPS certificates per Load Balancer. This limitation is not described [here](http://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-limits.html), so it might be subject to change.
 
+Elastic Beanstalk
+----------------
+
+### Elastic Beanstalk Basics
+- 📒 [Homepage](https://aws.amazon.com/elasticloadbalancing/) ∙ [Developer guide](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/Welcome.html) ∙ [FAQ](https://aws.amazon.com/elasticbeanstalk/faqs/) ∙ [Pricing](https://aws.amazon.com/elasticbeanstalk/pricing/)
+- **EB** (Elastic Beanstalk) is a PaaS (Platform as a Service) that helps developers create, deploy and scale web applications
+- EB handles deployment, configuration, provisioning, load balancing, auto-scaling, monitoring, and logging
+- EB creates AWS resources on your behalf but you retain full access and control of the underlying resources
+- 💸 There is no cost to use EB but you will still be charged the full cost of the underlying AWS resources created by EB
+
+### Elastic Beanstalk Tips
+- To speed up deployment before launch or in a dev stage, turn off health checks and set the `Deployment policy` to `All at once`
+- If you have a configuration you want to re-use for multiple EB apps, you can save the current configuration using `eb config save --cfg myEBConfig`
+- By default, EB doesn't have any alarms. You'll need to add them yourself on metrics that you're monitoring.
+- By default, EB doesn't enable [managed platform updates](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/environment-platform-update-managed.html?icmpid=docs_elasticbeanstalk_console). Enable them in configuration to have EB automatically apply updates during a pre-specified maintenance window
+
+### Elastic Beanstalk Gotchas and Limitations
+- 🔸 Don't edit [apache|nginx] conf files manually on ec2 instances as they will be re-written on each deployment (use [ebextensions](https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/ebextensions.html) instead)
+- 🔸 After creating an EB environment, it's no longer possible to change the `Name` tag
+- 🔸 EB will sometimes quarantine instances that cause multiple deployment issues. Despite being quarantined, EB will still deploy to them on subsequent deployments. To prevent this behavior, said instances will need to be terminated (or the underlying issue fixed)
+- File uploads are capped at 10MB for most default eb configurations - update [nginx config](https://stackoverflow.com/questions/18908426/increasing-client-max-body-size-in-nginx-conf-on-aws-elastic-beanstalk) to change
+- If you edit `.elasticbeanstalk/saved_configs/`, be aware that this is not kept in sync with the EB environment config. You'll need to manually fetch and save for changes to take effect
+
 Elastic IPs
 -----------
 
@@ -2005,7 +2028,6 @@ IoT
 - 	**IoT** is a platform for allowing clients such as IoT devices or software applications ([examples](http://internetofthingswiki.com/iot-applications-examples/541/)) to communicate with the AWS cloud.
 - 	Clients are also called **devices** (or **things**) and include a wide variety of device types.  Roughly there are three categories of device types that interact with IoT services by sending message over an IoT protocol to the IoT Pub/Sub-style message broker, which is called the IoT **Device Gateway**:
     * 	Send messages only: For example, the [AWS IoT Button](https://aws.amazon.com/iot/button/) on an [eddystone beacon](http://developer.estimote.com/eddystone/).
-    * 	Send and receive messages: For example, the [Phillips Home Safe Medical Alert device](http://rethink-iot.com/2015/10/16/philips-uses-new-aws-iot-platform-to-expand-its-healthsuite-cloud/)
     * 	Send, receive, and process messages: For example, a simple processing board, such as a **Raspberry Pi** ([quick start guide](http://docs.aws.amazon.com/iot/latest/developerguide/iot-device-sdk-c.html)), or an AWS device, such as [Echo or Echo Dot](https://developer.amazon.com/echo), which are designed to work with the [AWS Alexa skills kit](https://developer.amazon.com/alexa-skills-kit) (a programmable voice-enabled service from AWS).
 - 	AWS has a useful [quick-start](http://docs.aws.amazon.com/iot/latest/developerguide/iot-gs.html) (using the Console) and a [slide presentation](http://www.slideshare.net/AmazonWebServices/connecting-to-aws-iot) on core topics.
 * **IoT terms:**