vadirajks

example :
#yumdownloader --source  python-psycopg2-2.5.1-3.amzn2.0.2
yum -y install wget bash-completion bash-completion-extras vim screen sysstat chrony

vadirajks

ssh-keygen authentication key generation, management and conversion
  Generate an RSA SSH keypair with a 4096 bit private key
      $ ssh-keygen -t rsa -b 4096 -C "RSA 4096 bit Keys"
  Generate an DSA SSH keypair with a 2048 bit private key
      $ ssh-keygen -t dsa -b 1024 -C "DSA 1024 bit Keys"
  Generate an ECDSA SSH keypair with a 521 bit private key
      $ ssh-keygen -t ecdsa -b 521 -C "ECDSA 521 bit Keys"
  Generate an ed25519 SSH keypair- this is a new algorithm added in OpenSSH.
      $ ssh-keygen -t ed25519
  Extracting the public key from an RSA keypair

vadirajks

sudo alien --scripts jdk-8u144-linux-x64.rpm
sudo alien --scripts jdk-1.7.0_04-fcs.x86_64.rpm
sudo dpkg -i jdk-8u144-linux-x64.rpm
sudo dpkg -i jdk1.8.0-144_1.8.0144-1_amd64.deb
vadiraj@DevOps:~$ cat /etc/profile.d/jdk.sh
 #!/bin/bash
unset JAVA_HOME
unset JRE_HOME
export PATH=$(echo $PATH | tr -s ":" "\n" | grep -v java| tr -s "\n" ":")
export PATH=$(echo $PATH | tr -s ":" "\n" | grep -v jvm| tr -s "\n" ":")

vadirajks

[root@elasticsearch]# grep -v "^#\|^$" /etc/security/limits.conf 
* soft nofile     100000
* hard nofile     100000
* soft sigpending 1032252
* hard sigpending 1032252
* soft memlock    unlimited
* hard memlock    unlimited
* soft stack      unlimited
* hard stack      unlimited
* soft nproc      unlimited

vadirajks

FILE SPACING:

 # double space a file
 sed G

 # double space a file which already has blank lines in it. Output file
 # should contain no more than one blank line between lines of text.
 sed '/^$/d;G'

vadirajks

$ aws pricing describe-services \
  --region us-east-1 \
| jq -r '.Services[] | select (.ServiceCode=="AmazonEC2") | .AttributeNames[]' \
| sort
LeaseContractLength
OfferingClass
PurchaseOption
capacitystatus
clockSpeed

vadirajks

sudo yum makecache
sudo yum update
sudo yum install epel-release
sudo yum makecache
sudo yum install python-pip
sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-$(rpm -E '%{rhel}').noarch.rpm
sudo yum install https://$(rpm -E '%{?centos:centos}%{!?centos:rhel}%{rhel}').iuscommunity.org/ius-release.rpm
sudo yum makecache
sudo yum install yum-plugin-replace
sudo yum repolist

vadirajks

$ cat  /scripts/graphit_test.sh
#!/bin/bash
#benchmark.statsdtest.random.histograms:${RANDOM} ${epoch}\n  \
#benchmark.statsdtest.random.meters:${RANDOM} ${epoch}\n  \
#benchmark.statsdtest.random.sets:${RANDOM} ${epoch}\n  \
epoch=$(date +%s)
which node || { echo "node missing"; exit 2; }
[ -z "$1" ] && { echo "GRAPHITE_SERVER details missing"; exit 2; }
GRAPHITE_SERVER=$1
GRAPHITE_CARBON_PORT=2003

vadirajks

]# cat  zook.sh 
epoch=$(date +%s)
for zn in $(zookeepercli --servers zook1,zook2,zook3 -c lsr /); do echo "Znode:$zn" && zookeepercli --servers zook1,zook2,zook3 -c get /$zn ; done | sed '/^$/d' > /tmp/z-$epoch.txt 2>&1
cat /tmp/z-$epoch.txt

]# cat create_topic.sh
/opt/kafka/bin/kafka-topics.sh --delete --zookeeper zook1:2181,zook2:2181,zook3:2181 --topic etopic01
/opt/kafka/bin/kafka-topics.sh --create --zookeeper zook1:2181,zook2:2181,zook3:2181 --replication-factor 1 --partitions 2 --topic etopic01
/opt/kafka/bin/kafka-topics.sh --list --zookeeper zook1:2181,zook2:2181,zook3:2181 
/opt/kafka/bin/kafka-configs.sh --alter --zookeeper zook1:2181,zook2:2181,zook3:2181 --entity-type topics --entity-name etopic01 --add-config retention.ms=1000

vadirajks

]# yum -y install perl-XML-Simple perl-YAML-Syck perl-Data-Dumper
]# cat /custom_scripts/xml2yaml.pl
#!/usr/bin/perl

use XML::Simple;
#use Data::Dumper;
use YAML::Syck;

if( ( not defined $ARGV[0]) or ( $ARGV[0] eq "-h" ) or ( $ARGV[0] eq "--help" ) ) {
	print "USAGE: perl xml2yaml.pl file.xml > file.yaml\n";