Notes, summaries, assignments, exams, and problems for Technology

#useradd nombredeusuario :: para crear usuarios

#passwd :: nombredelusuario

#groupadd :: nombredelgrupo :: (forma normal)

#groupadd -g 600 nombredelgrupo :: (guid sobre 650)

#userdel nombredelusuario :: para deletear usuarios

#groupdelnombredelgrupo :: borrar el grupo

#usermod -G nombredelgrupo nombredeusuario :: para asignar usuario a grupo.

opcion 2: editar archivo /etc/group -> grupo:x:600:usuarioqueseagregara

#nano /etc/shadow :: para poder ver los usuarios y poder bloquearlos

#passwd -l nombredeusuario :: para bloquear usuario

#passwd -u nombredeusuario :: para desbloquear usuario

#sudo passwd :: para cambiar la contraseña de root

# tail /etc/passwd :: paraver informacion de usuarios

#su nombredelotrousuario :: para iniciar sesion como el usuario... Continue reading "Centos 5.5" »

INSERT INTO Donors(DonorName, DonorSex, DonorID)

SELECT Iname, Isex, Iid FROM [HHSourceDB].INDIVIDUAL;

INSERT INTO HHDW.Donors(DonorKey, DonorName, DonorSex, DonorID)

SELECT DonorKey, DonorName, DonorSex, DonorID FROM Donors;

-- One example of a One-Way Aggregate:


CREATE TABLE OneWayAggregateByGenderFactTable ASSELECT rm.CalendarKey, rm.CityKey, rm.VehicleKey, rm.DriverKey, SUM(rm.MilesDriven) AS TotalMilesDriven, SUM(rm.AmountCharged) AS TotalAmountCharged, p.PassengerGenderFROM RevenueandMileageFactTable rm, PassengerDimension pWHERE p.PassengerKey = rm.PassengerKeyGROUP BY rm.CalendarKey, rm.CityKey, rm.VehicleKey, rm.DriverKey, p.PassengerGender;

-- Creating daily city snapshot

CREATE TABLE DailyCitySnapshot ASSELECT rm.CityKey, rm.CalendarKey,

1. Clonación de máquinas virtuales

ssh root@dirección

virt-clone --original ESTACION1 --name ESTACION2 --file /var/lib/libvirt/estacion2.qcow2 --mac RANDOM

Comprobarlo: virsh dumpxml ESTACION1 | grep 'mac'

2. Configuración de una red virtual

virsh net-dumpxml default > red2.xml

vi red2.xml

<name>RED2</name> (nombre)

<forward mode='nat'/> (tipo de envío; puede cambiarse a route si es enrutada o bridge si es de tipo bridge)

<bridge name='virbr2' stp='on' delay='0'/> (a dónde se asocia el switch)

<ip address='192.168.200.1' netmask='255.255.255.0'> (dirección IP de la red)

<range start='192.168.200.20' end='192.168.200.254'/> (rango de IPs de la red)

virsh net-define red2.xml

virsh net-start RED2

virsh net-autostart... Continue reading "Virtualización con KVM y libvirt: clonación, redes, almacenamiento e iSCSI" »

Glosario de términos de logística y cadena de suministro

A continuación encontrará un glosario de términos de logística en inglés con su traducción y explicación en español, útil para profesionales del transporte, el almacenaje y el comercio internacional.

Términos de la A a la C

• 3PL: third-party logistics (logística de terceros)
• Air waybill (también conocido como consignment note): conocimiento aéreo
• Assembling / assemble: organizar
• Assembly: ensamblaje
• Bendable: flexible
• Break-bulk: carga fraccionada
• Bundling: agrupar
• Cargo customs clearance: pasar la aduana
• Carriage: transporte
• Carrier: transportista
• Collection: recogida
• Collections: recogidas
• Comprehensive: completos, amplios
• Consolidation: agrupamiento de pequeños envíos en un solo contenedor
• Consignee:

Maneuverability of a ship can be defined as the percentage of efficiency that allows the vessel to maintain a course or vary its bow, with the purpose of achieving a certain position with respect to its environment.

Defining Government Capacity

It is the property that the ship must have so that it can change course in the shortest possible time and space.

Maneuvers for Recovery Capacity

The Kempf Maneuver

The Kempf maneuver consists of the following actions:

• When the yaw rate reaches a constant value, the rudder is placed at 20° to the opposite side.
• When the yaw rate reaches a value identical to the previous one in the direction of the turn, the rudder is changed to the opposite side again.

Among the most important factors in this maneuver are:

• Time

Core Concepts of Palo Alto Networks

Strata

PA-Series: PA-220, PA-800, PA-3200, PA-5200, PA-7000

VM Series: VM-50, VM-100, VM-300, VM-500, VM-700

• Amazon Web Services
• Cisco ACI
• Citrix NetScaler SDX
• Google Cloud Platform
• Kernel-based Virtual Machine (KVM)
• Microsoft Azure and Microsoft Hyper-V
• OpenStack
• VMware ESXi, VMware NSX, and VMware vCloud Air

Panorama

• Policy Management
• Centralized Visibility
• Network Security Insights
• Automated Threat Response
• Network Security Management
• Enterprise-Level Reporting and Administration

Prisma (Cloud, SASE, SaaS, VM Series ML-Powered NGFWs)

• Cloud Security - Delivers complete security across the development lifecycle on any cloud.
• Prisma Cloud - Cloud Security Posture Management and Workload Protection (Uses API)
  • Alibaba Cloud
  • Amazon

Computer Network and Its Types

A network refers to a collection of interconnected nodes or entities that can communicate and share information with each other. These nodes can be computers, devices, or even people. Networks are used to facilitate the exchange of data, resources, or services among the connected entities.

Types of Networks

There are several types of networks, including:

• Local Area Network (LAN): LANs are typically limited to a small geographic area, such as a home, office, or campus. They are used for connecting devices within a relatively close proximity, often using Ethernet cables or Wi-Fi.
• Wide Area Network (WAN): WANs cover larger geographical areas and connect LANs over long distances. The internet is the most extensive example

I. Types of Fibres

There are two types of fibres:

• Natural fibres: Obtained from natural sources (e.g., cotton, silk, wool).
• Synthetic fibres: Man-made fibres (e.g., rayon, nylon, acrylic).

II. Understanding Polymers

A synthetic fibre is a chain of small units of chemical substances joined together. Many such single units combine to form a single unit called a polymer. The term polymer means "made of many units joined together."

III. Types of Synthetic Fibres

• Rayon: Synthesized from wood pulp. It resembles silk, so it is also known as artificial silk. Rayon can be dyed in different colours and is much cheaper than silk.
• Nylon: The first commercially synthesized fibre. It is made from coal, water, and air. Nylon is very strong and its fabric resembles

Introduction

In the coming years, the manufacture of mirrors and glass will grow because the demand will be higher.

The process of making glass consists of melting certain substances until they solidify. This process dates back to a time before 2000 BC when glass was worked by hand using molds. Over time, glass has been used to make containers, decorative objects such as jewelry, and also in architecture and industry. At present, its recycling provides an important benefit to conserve the environment and reduce pollution.

Hypothesis

How viable is it to assemble a glass processing plant in Ecuador?

Ecuador does not manufacture glass; it is always imported. What they do in Ecuador is the processing of glass, such as:

• Polishing
• Vice-lane
• Stacking and

Understanding Sound Types

Analogue Sound Explained

Analogue sound imitates the vibrations of real sound. Its electrical signal has an analogue curve similar to a real sound wave.

Digital Sound Explained

Digital sound recording does not imitate vibrations but converts them into a binary code, the language computers use.

Digital sound is obtained through a converter. It transforms real sound (analogue) into a computer-readable format.

The Digitization Process

Role of the Converter

A converter is a device that transforms real sound into digital sound. The process is called sampling.

Sound Reproduction

To reproduce sound, the converter follows the inverse process, transforming the digital information back into real sound.

The MIDI System: Digital Communication