Add SRI exam documentation.
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								2/SRI/exams/examen-nortega.txt
									
									
									
									
									
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					================================
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					*** Ejercicio Apache Examen  ***
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					***           ---            ***
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					*** Nicolás A. Ortega Froysa ***
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					================================
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					# Formato
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					---------
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					Dónde poner los comandos:
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					[máquina:usuario]
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					Salida de un comando:
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					```
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					<salida>
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					```
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					# Paso I: Instalación de SSH y Apache
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					-------------------------------------
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					[servidor:root]
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					# Instalar OpenSSH (sshd)
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					apt install openssh-server
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					# Comprobar funcionamiento de sshd
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					systemctl status sshd
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					[cliente:-]
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					# decir que sí a reconocer el host y entrar con la contraseña
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					ssh examen@172.16.40.26
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					# usar `su -` para entrar como root
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					[servidor:root] (via ssh para el resto del examen)
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					# instalar apache2
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					apt update
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					apt install apache2
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					# comprobar funcionamiento de apache2
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					apt install curl
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					curl localhost
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					# configurar dominio examen.es
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					echo "127.0.0.1     examen.es" >> /etc/hosts
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					[cliente:root]
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					echo "172.16.40.26     examen.es" >> /etc/hosts
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					[servidor:root]
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					cd /etc/apache2/sites-available/
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					cp 000-default.conf examen.es.conf
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					# editar el archivo para que salga como aparece en el `cat`
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					vi examen.es.conf
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					cat examen.es.conf
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					```
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					<VirtualHost *:80>
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					        # The ServerName directive sets the request scheme, hostname and port that
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					        # the server uses to identify itself. This is used when creating
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					        # redirection URLs. In the context of virtual hosts, the ServerName
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					        # specifies what hostname must appear in the request's Host: header to
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					        # match this virtual host. For the default virtual host (this file) this
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					        # value is not decisive as it is used as a last resort host regardless.
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					        # However, you must set it for any further virtual host explicitly.
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					        ServerName examen.es
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					        ServerAdmin webmaster@localhost
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					        DocumentRoot /var/www/html
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					        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
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					        # error, crit, alert, emerg.
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					        # It is also possible to configure the loglevel for particular
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					        # modules, e.g.
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					        #LogLevel info ssl:warn
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					        ErrorLog ${APACHE_LOG_DIR}/error.log
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					        CustomLog ${APACHE_LOG_DIR}/access.log combined
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					        # For most configuration files from conf-available/, which are
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					        # enabled or disabled at a global level, it is possible to
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					        # include a line for only one particular virtual host. For example the
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					        # following line enables the CGI configuration for this host only
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					        # after it has been globally disabled with "a2disconf".
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					        #Include conf-available/serve-cgi-bin.conf
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					</VirtualHost>
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					```
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					cd ../sites-enabled/
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					rm 000-default.conf
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					ln -s ../sites-available/examen.es.conf examen.es.conf
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					systemctl restart apache2
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					echo "Mi HTML" > /var/www/html/index.html
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					[cliente:-]
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					curl examen.es
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					```
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					Mi HTML
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					```
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					[servidor:root]
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					mkdir /home/examen.es
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					echo "Bienvenido a tu examen" > /home/examen.es/indice.html
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					echo "Error 404..." > /home/examen.es/error403.html
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					mkdir /home/enlace
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					touch /home/enlace/enlace.html
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					cd ..
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					htpasswd -c passwd admin
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					cd sites-enabled/
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					vi examen.es.conf
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					cat examen.es.conf
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					```
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					<VirtualHost *:8081>
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					        # The ServerName directive sets the request scheme, hostname and port that
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					        # the server uses to identify itself. This is used when creating
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					        # redirection URLs. In the context of virtual hosts, the ServerName
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					        # specifies what hostname must appear in the request's Host: header to
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					        # match this virtual host. For the default virtual host (this file) this
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					        # value is not decisive as it is used as a last resort host regardless.
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					        # However, you must set it for any further virtual host explicitly.
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					        ServerName examen.es
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					        ServerAdmin webmaster@localhost
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					        DocumentRoot /home/examen.es
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					        DirectoryIndex indice.html
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					        ErrorDocument 403 /error403.html
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					        Alias /enlace/ /home/enlace/enlace.html
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					        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
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					        # error, crit, alert, emerg.
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					        # It is also possible to configure the loglevel for particular
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					        # modules, e.g.
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					        #LogLevel info ssl:warn
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					        ErrorLog ${APACHE_LOG_DIR}/error.log
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					        CustomLog ${APACHE_LOG_DIR}/access.log combined
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					        # For most configuration files from conf-available/, which are
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					        # enabled or disabled at a global level, it is possible to
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					        # include a line for only one particular virtual host. For example the
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					        # following line enables the CGI configuration for this host only
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					        # after it has been globally disabled with "a2disconf".
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					        #Include conf-available/serve-cgi-bin.conf
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					</VirtualHost>
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					<Directory /home/enlace/>
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					        Options FollowSymLinks
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					        AllowOverride None
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					        Require all granted
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					</Directory>
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					<Directory /home/examen.es/>
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					        Options FollowSymLinks
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					        AllowOverride None
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					        Require all granted
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					</Directory>
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					```
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					cat ../ports.conf
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					```
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					# If you just change the port or add more ports here, you will likely also
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					# have to change the VirtualHost statement in
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					# /etc/apache2/sites-enabled/000-default.conf
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					Listen 80
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					Listen 8081
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					<IfModule ssl_module>
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					        Listen 443
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					</IfModule>
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					<IfModule mod_gnutls.c>
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					        Listen 443
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					</IfModule>
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					# vim: syntax=apache ts=4 sw=4 sts=4 sr noet
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					```
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