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// cluster http call to json
http://<url>:2113/gossip?format=json

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// Install tfenv
homebrew install tfenv

//Browse Terraform versions

$ tfenv list-remote
0.12.0
0.12.0-rc1
0.12.0-beta2
0.12.0-beta1

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#sample secret yaml with plain text stringData mechanism 
apiVersion: v1
stringData:
    someCredentialName: someSuperSecretCredential
kind: Secret
metadata:
  name: someSecretName
  namespace: someNamespace
type: Opaque

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//Install redis cli for connectivity testing from containers 
apt-get update 
apt-get install redis-tools

//Ping test
redis-cli -c -h redis-cluster-name.xxxxxx.clustercfg.use1.cache.amazonaws.com -p 6379 ping

//Monitor incoming writes
redis-cli -c -h redis-cluster-name.xxxxxxxxxxx.clustercfg.use1.cache.amazonaws.com -p 6379 monitor

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////Install and connect to PostgreSQL via CLI////

//Install the psql cli tool
yum install psql 

//Then connect via the utility with the following flags
psql \
   --host=some-path.cluster-abcdefghijklmnop.us-east-1.rds.amazonaws.com \
   --port=5432 \
   --username=your_username \

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// Find your hostname and IP

hostname -i  //ip
hostname -f  //long host name (FQDN)


TODO: 
netstat 
ifconfig 
dig

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kubectl create namespace <mynamespace>
kubectl get namespaces
kubectl get pods

kubectl config view
kubectl cluster-info dump

#exec into a shell within a running pod
kubectl exec -it <pod_name> -n <namespace>  -- /bin/bash

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//Find EC2 Instnaces by AMI 
aws ec2 describe-instances --query 'Reservations[*].Instances[*].[Placement.AvailabilityZone, State.Name, ImageId, InstanceId]' --filters "Name=image-id, Values=ami-xxxxxx"  --output=text


//// Find EC2 Instances by tag ////

//Instnaces missing the `name` tag 
aws ec2 describe-instances \
  --output text \
  --query 'Reservations[].Instances[?!not_null(Tags[?Key == `Name`].Value)] | [].[InstanceId]'

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Start Zookeeper

bin/zookeeper-server-start.sh config/zookeeper.properties

Start Kafka

bin/kafka-server-start.sh config/server.properties

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Apache Kafka is a highly-scalable publish-subscribe messaging system that can serve as the data backbone in distributed applications. With Kafka’s Producer-Consumer model it becomes easy to implement multiple data consumers that do live monitoring as well persistent data storage for later analysis. You can assume that RabbitMQ is similar to Kafka, You do get an option for message-sending or Broadcasting. The installation process for OSX is as below.

1. The best way to install the latest version of the Kafka server on OS X and to keep it up to date is via Homebrew.

    brew search kafka
    brew install kafka 
   

2. The above commands will install a dependency called zookeeper which is required to run kafka. Start the zookeeper service.

zkserver start