ingmarioalberto

60 horas - ultimo viernes y sabado examen
http://diplomado.gnuin0.info
on-premise: datacenter que se encuentra en las empresas

Sistema operativo: Software que gestiona la omunicacion entre una
persona y un sistema. Conj. de progs que trabajan coord para admin de
manera optima los recursos físicos de una computadora.


Como bootea una PC BIOS->MBR->GRUB->Kernel->Init>Runlevel

ingmarioalberto

Hints:
  - El profesor indica que es mejor no tener swap
  - Al instalar oracle en el apartado de Servers -> System Administration Tools, por default no viene ninguno seleccionado, por lo que hay que manualmente agregar: oracle-rdbms-server-12cR1
Profesor: Conde
https://loquecallamoslosdba.wordpress.com/

RTO Recovery Time Objective: tiempo en el cual yo espero recuperarme
RPO Recovery Point Objective: tiempo que transcurre entre el momento del desastre y el último punto de restauración.
  Banco RPO ~= 0
que tanto puedo perder

ingmarioalberto

*Instalación en google cloud, imágen con Centos 7 on 20GB HD, 3.75GB RAM, 1vCPU
sudo yum -y update
sudo yum install -y curl policycoreutils-python openssh-server wget
sudo firewall-cmd --zone=public --permanent --add-service=http
success
sudo firewall-cmd --zone=public --permanent --add-service=https
success
sudo firewall-cmd --zone=public --permanent --list-all
  target: default
  icmp-block-inversion: no

ingmarioalberto

ssh USER@IP tail -f /var/log/haproxy-traffic.log | stdbuf -o0 awk '{print $9" "$6" - - "$7" "$18" "$19" "$20" "$11" "$12}' | sed -u "s/:[0-9]\{4,5\}//g" | sed -u "s/\(:[0-6][0-9]\)\.[0-9]\{3\}/\\1 -400/g" | logstalgia --sync --paddle-mode vhost

ingmarioalberto

dmesg_human () {     $(type -P dmesg) "$@" | perl -w -e 'use strict;
  my ($uptime) = do { local @ARGV="/proc/uptime";<>}; ($uptime) = ($uptime =~ /^(\d+)\./);
  foreach my $line (<>) {
  printf( ($line=~/^\[\s*(\d+)\.\d+\](.+)/) ? ( "[%s]%s\n", scalar localtime(time - $uptime + $1), $2 ) : $line )
}'; }


// https://stackoverflow.com/questions/13890789/convert-dmesg-timestamp-to-custom-date-format
// cred: https://stackoverflow.com/users/636849/lucas-cimon

ingmarioalberto

#ID=google document reference id
FILEID="ID"; wget "https://drive.google.com/uc?export=download&id=${FILEID}&confirm=yes"
#credits: https://stackoverflow.com/questions/37453841/download-a-file-from-google-drive-using-wget#comment127131320_39087286

ingmarioalberto

root ALL=(ALL:ALL) ALL
 |    |    |   |    |
 |    |    |   |    +-Command or All commands (without password?
 |    |    |   |      add NOPASSWD: before keyword)
 |    |    |   +------Run cmd as Group or All groups
 |    |    +----------Run cmd as User or All users
 |    +---------------Host or All hosts
 +--------------------sys user or "sys %group" or "user aliases" to apply rule 
 
 User_Alias ~= groups (first letter must be uppercase)

ingmarioalberto

OVA / OVF import vmware 6.5: Stuck on validating / validando ?
  R= Make sure you are not logged in on the vcenter with the IP address, use FQDN instead.

ingmarioalberto

1. Verify it is a Dynamic Disk || convert it to dynamic 
2. zerotise empty space:
  windows guest: (tested)
    2.1 download sdelete.exe (https://docs.microsoft.com/en-us/sysinternals/downloads/sdelete)
    2.2 as administrator, run: sdelete.exe c: -z
  linux guest: (untested)
    2.1 install zerofree
    2.2 reboot into recovery mode
    2.3 drop to root shell
    2.4 zerofree -v /dev/sdXY

ingmarioalberto

#!/bin/bash
die () {
if [ -z "$1" ]
	then
		echo "something went very wrong..."
	else
		echo "NOK:${1}"
	fi	
	exit 1
}