vkhatri

## Client:

# Environment Variables to Forward to Remote Host
# .ssh/config

SendEnv VARIABLE1
SendEnv VARIABLE2
..
SendEnv VARIABLEn

vkhatri

# Remote Gateway Node to Login to App Servers - 192.168.1.1
Host app_proxy1
  Hostname 192.168.1.1
  LocalForward 8080 192.168.1.100:8080
  LocalForward 8081 192.168.1.101:8080
  LocalForward 8082 192.168.1.102:8080
  
Host app_proxy2
  Hostname 192.168.1.1
  LocalForward 8090 192.168.1.100:8081

vkhatri

response=$(cat -)
payload=$(echo $response | sed -e 's/^.*"Payload":"\([^"]*\)".*$/\1/')
# action string "runme" == byte "cnVubWU=" , replace "runme" with your payload data

if [ "$payload" == "cnVubWU=" ]; then
  logger restarting ntpd, consul triggered by payload $payload
  # /usr/bin/sudo /sbin/service ntpd restart
else
  logger skipping ntpd restart, consul triggered by payload $payload
fi

vkhatri

Resources

KUBERNETES CLUSTER

• local https://github.com/kubernetes-sigs/kind (or just use minikube if it works for you)
• cloud https://cloud.google.com/kubernetes-engine (for PersistentVolume and Ingress, I needed to try the real deal)
• practice environment: https://github.com/arush-sal/cka-practice-environment

PRACTICE

vkhatri

#!/bin/bash
PEER_LIST_FILE=/etc/asg-peer-instances
SELF_IP=$(ifconfig eth0 | grep -o "inet .*  netmask" | cut -f2 -d' ')
SELF_INSTANCE_ID=$(curl http://169.254.169.254/latest/meta-data/instance-id)
SELF_PLACEMENT=$(curl http://169.254.169.254/latest/meta-data/placement/availability-zone)
SELF_REGION="${SELF_PLACEMENT%?}"
SELF_ASG=$(aws ec2 describe-tags --filters "Name=resource-id,Values=${SELF_INSTANCE_ID}" --region $SELF_REGION --query 'Tags[?Key==`aws:autoscaling:groupName`].Value' --output text)
ASG_INSTANCE_IDS=$(aws autoscaling describe-auto-scaling-groups --auto-scaling-group-name $SELF_ASG --region $SELF_REGION --query 'AutoScalingGroups[*].Instances[*].InstanceId' --output text | xargs)
AWS_INSTANCE_IPS=$(aws ec2 describe-instances --instance-ids $ASG_INSTANCE_IDS --region $SELF_REGION --query 'Reservations[*].Instances[*].PrivateIpAddress' --filters 'Name=instance-state-name,Values=running' --output text)
PEER_LIST=$(echo $AWS_INSTANCE_IPS | sed "s/${SELF_IP}//g" | xargs)

vkhatri

# Module Source - https://github.com/vkhatri/aws-transit-vpc/tree/feature-vrf
# Change Module Source accordingly, currently
import os
import ast
import logging
import sys
# symlink transit-vpc-poller.py module for import workaround
# ln -s transit-vpc-poller.py transit_vpc_poller.py
import transit_vpc_poller

vkhatri

# Module Source - https://github.com/vkhatri/aws-transit-vpc/tree/feature-vrf
# http://docs.aws.amazon.com/AmazonS3/latest/dev/notification-content-structure.html
import ast
import logging
import sys
# symlink transit-vpc-poller.py module for import workaround
# ln -s transit-vpc-push-cisco-config.py transit_vpc_push_cisco_config.py
import transit_vpc_push_cisco_config

# Set Logging stream to STDOUT

vkhatri

---
exhibitor_storage_backend: static
oauth_enabled: false
telemetry_enabled: false
bootstrap_url: http://192.168.1.100:80
cluster_name: dev
master_discovery: static
master_list:
  - 192.168.1.1
  - 192.168.1.2

vkhatri

#!/bin/bash

set -e

if [ -f "/usr/bin/docker" ]; then
  exited=$(docker ps -a -q -f status=exited | wc -l)
  if [ $exited == "0" ]; then
    echo "No exited container to Remove"
  else
    echo "Removing exited docker containers..."

vkhatri

#!/bin/bash

# Info: Shell Wrapper to populate Marathon Application
# Containers IP & Port ENV Variables.
#
# Variables:
# MARATHON_GROUP: marathon group name
# 	    e.g. Marathon APP - /group0/app
#            MARATHON_GROUP=group0
#       e.g. Marathon APP - /group0/group1/app