Pivotal Cloud Foundry Developer Certification - Cloud Foundry Overview - Starting, Restarting and Restaging applications

Do you know the difference between restarting, restaging and redeploying an application?
How does each of these affect the services, environment-variables available to an application?

Starting an app:
1. '$ cf push YOUR-APP' command with manifest entry of command attribute i.e. command: node YOUR-APP.js
2. '$ cf push YOUR-APP -c "node YOUR_APP.js"', where -c command line option for defining the start command.

First time deployment using 'cf push' uses buildpack start command by default.

Restarting an app:
Restarting your application stops your application and restarts it with the already compiled droplet. Diego cell unpacks, compiles and runs a droplet on a container.

'cf restart YOUR-APP'

Restaging an app:
Restaging your application stops your application and re-stages it, by compiling a new droplet and starting it.

'cf restage YOUR-APP'

For more details refer start-restart-restage

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Pivotal Cloud Foundry Developer Certification - Logging, Scaling and High Availability

 How do you access application logs? cf logs APP_NAME cf start APP_NAME To see the logs of particular pcf sub system. cf logs APP_NAME | grep "API\|CELL" To exclude particular logs cf logs APP_NAME | grep -v "API\|CELL" To see application events i.e. start, stop, crash etc... cf events APP_NAME To display all the lines in the Loggregator buffer cf logs APP_NAME --recent  What are the components of the Loggregator system? Loggregator is the next generation system for aggregating and streaming logs and metrics from all of the user apps and system components in a Cloud Foundry deployment. Primary use: 1. Tail/dump logs using CLI. 2. Stream to 3rd party log archive and analysis service 3. Operators and admins can access Loggregator Firehouse, the combined stream from all the apps and metrics data. 4. Operators can deploy nozzle to the firehouse. A nozzle is a component that monitors the Firehose for specified events and metrics,

Kumaoni Song/Poem - Uttarakhand meri matrebhoomi

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OpenStack - Conceptual architecture showing the relationship b/w services

AWS vs Openstack comparison https://redhatstackblog.redhat.com/2015/05/13/public-vs-private-amazon-compared-to-openstack/

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