guerzon

#!/usr/bin/env bash
# Usage: ./verify_ciphers.sh IP:PORT
# Credits: http://superuser.com/a/224263/204745

# OpenSSL requires the port number.
SERVER=$1
DELAY=1
ciphers=$(openssl ciphers 'ALL:eNULL' | sed -e 's/:/ /g')
 
echo Obtaining cipher list from $(openssl version).

guerzon

## Important Documentation

Documentation: https://docs.ansible.com/ansible/latest/index.html
Modules: https://docs.ansible.com/ansible/latest/modules/modules_by_category.html
Community: https://docs.ansible.com/ansible/latest/community/index.html

## Other resources

Ansible for the Windows Admin: https://www.youtube.com/watch?v=ZI20Y10OKd0

guerzon

#!/bin/bash

set -e

UPDATES_URL="http://updates.jenkins-ci.org/download/plugins/"

if [ $# -lt 2 ]; then
  echo "USAGE: $0 plugin-list-file destination-directory"
  exit 1
fi

guerzon

### On RHEL5 servers ###
1. Check the login failure count
pam_tally --user username
2. Reset the login failures
pam_tally --user username --reset
3. Retry logging in.

### On RHEL6 and RHEL7 servers ###
1. Check the login failure count
pam_tally2 --user username

guerzon

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD