Con el siguiente tip explicaré cómo instalar un servidor en un PC al que no le estén dando uso.
¿Servidor de que? se estarán preguntado; Con linux pueden hacer muchos tipos de servidores:
- linux pueden hacer muchos servidores:
- LAMP: Instalando apache, php, mysql; pueden hacer un web server profesional.
- NAS: Con Samba para compartir archivos en toda la red.
- Media Server: Con firefly puedes escuchar los temas de tu server con itunes de manera facil, como si estuvieran en tu pc.
- FTP: Puedes subir y bajar archivos a tu servidor desde internet (util para compartir pr0n con tus amigos)
- Y muchas cosas mas, subversion, trac, mldonkey, DHCP, compartir internet, etc; tu imaginación y necesidad es el limite.
El objetivo es crear un servidor ciego. Con esto nos referimos a que una ves que instalemos lo básico, este PC no tendrá teclado, monitor y mouse; simplemente estarán conectados 2 cables, corriente y red. También carecerá de una interfaz grafica (ventanas) por lo que tendremos que acostumbrarnos un poco a usar la consola pero simplemente para instalar las cosas. Al momento de utilizar algo lo haremos vía web, con esto me refiero a que con solo abrir un navegador de Internet nos conectaremos con nuestro servidor y lo manejaremos desde el navegador, para hacer esto no es necesario tener Internet.
El hardware que necesitan no es de muy ultima generación, actualmente en mi casa tengo un Pentium 3 de 850mhz, 386mb de RAM, y un disco rígido de 40gb (mínimo uno de 6gb y están listos), así que no se preocupen tanto por el hardware, linux se arregla con poco.
La distribución elegida de linux es... Debian. En este caso la elegi por que es robusta, confiable y estable. Mucha gente tendrá varios puntos en contra de Debian, desde la falta de documentación con respecto a otras distribuciones de linux, y la falta de actualización a sus paquetes estables. En ambos puntos tienen razón, pero si logras hacer funcionar algo en Debian, funcionara de por vida.
La versión a usar es la Etch, la ultima al momento de escribir esto. Mas precisamente la ISO netinstall. Esta ISO trae los archivos de sistema mínimos y es todo lo que necesitamos para comenzar. Los demás paquetes (programas) se bajaran desde Internet. La pueden bajar de aqui, la versión es la netinstall y la arquitectura depende del PC que utilicen, i386 si es intel, amd64 si es un amd 64 bits, pero luego se cambiara el núcleo si es necesario.
Bajen la versión, son algo de 180mb, pásenla a un CD-rom, y luego, a instalar.
Una ves que tenemos el PC funcionando (que enciende he intenta leer el disco) reiniciamos desde el CD, debian nos pedirá que apretemos Enter y a comenzar a instalar.
Las primeras ventanas son para seleccionar el idioma, la distribución del teclado y la localidad. Luego de que comience a cargar varias cosas vendrá nuestro primer inconveniente, la placa de red.
El instalador tiene un cliente DHCP para la asignación de una IP; si queremos ingresarle una dirección manualmente debemos cancelar el proceso de búsqueda de servidor DHCP y llenar todo lo que pide, que es lo siguiente:
- ip
- mascara de subred
- gateway
- servidor dns
Continua cargando algunas cosas mas y nos pide el hostname (el nombre del PC) y el dominio, el dominio puede ir en blanco.
El otro punto complicado, la partición de disco. Como va a ser nuestro primer server y de uso personal, lo haremos sencillo, lo partiremos en 3 pedazos, una partición de boteo, la memoria de intercambio y el resto del disco.
Cuando nos pregunte como lo particioneramos, le diremos que lo vamos a hacer en forma manual.
En la ventana siguiente se nos informa de los discos y las particiones, seleccionamos el disco y nos preguntara si queremos que borre todas las particiones, diremos que si.
Ahora, nos informara que tenemos el disco libre, seleccionamos el espacio vacío y nos preguntara de cuanto queremos la partición, con 150mb esta bien, luego nos preguntara que tipo de partición (Primaria o lógica) donde eligiéremos "Primaria".
Nos preguntara donde la queremos, begining (comienzo) esta bien. La próxima ventana es informativa, pero debemos cambiar algo, debemos ponerle la marca de boteable, (con seleccionarla alcanza) y debemos decirle que el punto de montaje (mounting point) es /boot; tiene un menú para elegir asi que no es muy difícil. Una ves echo todo esto, ya esta lista la partición, seleccionando "Done bla bla" aceptamos.
Otra ves con la ventana informativa, pero ahora vemos la partición de 150mb y el resto del espacio libre debajo. Seleccionamos otra ves el espacio vacío, esta ves el tamaño sera igual o el doble de la memoria RAM (ustedes eligen), la partición sera lógica y estará al principio de la partición. En la ventana informativa, cambiaremos el tipo de archivos (filesystem) de ext3 a swap y listo, nada mas para esta partición.
Nos falta definir la ultima. Seleccionamos el espacio sin particionar, el espacio sera el resto del disco, asi que con el espacio que nos propone esta bien. La partición es del tipo lógica y como es la última no nos preguntara donde la queremos. A la pantalla informativa de la partición no le cambiamos nada.
Ya estamos listo, a escribir los cambios.
Luego de algunas cosas que haga llegara el momento de los usuarios.
Nos pedirá la clave para root, luego que la confirmemos. Luego, tendremos que crearle un usuario (Nombre completo, nombre de usuario, password) por mas que siempre usemos root para todo.
Lo ante ultimo por hacer, es seleccionar que paquetes queremos por defecto, simplemente destildamos todos los que haya tildado, los seleccionaremos individualmente luego. Lo siguiente es seleccionar un mirror de un repositorio; elegiremos alguno cerca de nuestro domicilio y si nos llega a pedir algo de http con proxi, apretaremos Enter.
Lo ultimo por hacer, es decir que si queremos un gestor de arranque. Diremos que si.
Listo, el sistema reinicia!
Espero que les sea fácil y útil, el próximo numero sera más breve, "Acceso remoto"
¿Sabes SQL? ¿No-SQL? Aprende MySQL, PostgreSQL, MongoDB, Redis y más con el Curso Profesional de Bases de Datos que empieza el martes, en vivo.
Por Gzaloprgm el 08 de Enero de 2008
Por Yaraher el 08 de Enero de 2008
Excelente aporte Dientuki, y aunque normalmente prefiero el enfoque de crear máquinas virtuales dentro de un servidor para que cumplan con esa función (retornar las páginas XHTML), creo que de todas formas es una buena introducción al tema.
Por Gzaloprgm el 09 de Enero de 2008
Alguien sabe si funcionaría con una pentium 233mhz con 64mb de ram ?
Por Dientuki el 09 de Enero de 2008
Gzaloprgm_blog :
No entiendo que quieres decir, ¿poco o mucho? En realidad el booteo pesa algo de 23 mb, las demas cosas del sistema estan en otra particion. Particionando podemos ganar rendimiento al disco; una ves que inicie la pc nunca mas leera esa particion, por lo el movimiento del brazo del disco sera menor.
Gzaloprgm_blog :
Por gzaloprgm el 09 de Enero de 2008
No entiendo que quieres decir, ¿poco o mucho? En realidad el booteo pesa algo de 23 mb, las demas cosas del sistema estan en otra particion. [...]
Si lo dejás en la misma partición ganás algo?
lo he hecho funcionar en una pentium 166mhz con 32mb de ram... 8 segundos para mostrar el home del wordpress
Ok, gracias, ya estoy bajando el netinstall para ponerle debian a una pc vieja que tengo guardada.
Por Dientuki el 11 de Enero de 2008
gzaloprgm_blog :
No entiendo que quieres decir, ¿poco o mucho? En realidad el booteo pesa algo de 23 mb, las demas cosas del sistema estan en otra particion. [...]
Si lo dejás en la misma partición ganás algo?
Si. Rendimiento.
El disco rigido es la parte mas lenta de la pc, fisicamente tiene el mismo principio que los discos de pasta, o sea, una superficie redonda que gira a cierta velocidad y una punta que lee esa superficie. La parte mas lenta de toda la pc es el brazo mecanico que tiene la punta.
Por otro lado, cuando grabas un archivo en el disco, puede ser que este archivo se fragmente, es decir, que se parta en varios pedazos y que estos pedazos esten sueltos por todo el disco. A la hora de leer ese archivo, tendras que recorrer varias partes del disco.
Si un archivo se te fragmenta, le estas diciendo a la parte mas lenta de la pc que lo busque, con lo cual se te alenta todo.
Ahora, si particionas como indica el tip, tendras algo como esto en tu disco
0 ---- 150 ----- 300 -------- 4gb
|--------|---------|-------------|
- boot - swap - resto
Cuando el sistema inicie leera lo que hay entre 0 y 150, luego el brazo se mantendra entre los 4gb y los 150 - 300; nunca mas ira al inicio del disco, con lo que ganaras un poco de rendimiento.
Lo ideal es particionar linux en mas partes, para evitar la fragmentacion, ganar orden, y obtener mucho mejor rendimiento.
Actualmente mi pc con linux tiene 9 particiones
Por joel jerez el 21 de Enero de 2008
Por Leandro el 24 de Enero de 2008
El instalador tiene un cliente DHCP para la asignación de una IP; si queremos ingresarle una dirección manualmente debemos cancelar el proceso de búsqueda de servidor DHCP y llenar todo lo que pide, que es lo siguiente.....
Que poner en lo que sigue, que direccion IP, una local o que?
Por KLAUDIO el 24 de Enero de 2008
SERVIDOR PERO SIN PROGRAMAS LO KIIERO HACER MAUAPLMENTE ESKE NO KONFIO EN LOS PROGRAMAS UN 100% Y ESO GRASIAS
RESPONDAN LUEGO PORFA
Por Dientuki el 25 de Enero de 2008
@KLAUDIO: especifica un poco tus miedos, por el bien de todos. Puedes hacer desde 0 tu propio servidor (sistema operativo, servidor, lenguaje de servidor, etc) pero cuando lo termines tendras algunos nietos.
Por Clemo el 25 de Febrero de 2008
Por Dientuki el 25 de Febrero de 2008
Por Jonatan el 10 de Junio de 2008
* ip
* mascara de subred
* gateway
* servidor dns
no tengo ni la menor idea, de donde saco estos numeros. Gracias me siper copa esto.
Saludos
Por lili el 06 de Agosto de 2008
Por supermercado13 el 29 de Agosto de 2008
Por Bernardo Socha Acost el 04 de Marzo de 2009
Está muy interesante el instructivo
www.bersoa.com/
Por alejandro el 06 de Mayo de 2009
Por rumr el 17 de Julio de 2009
Por diegop el 05 de Marzo de 2010
Por braggar el 16 de Mayo de 2010
Por Ustensmoco el 06 de Mayo de 2011
Por davo el 16 de Junio de 2011
voy a probar y despues le comento gracias!!!!!!!!!
Por Isaac el 27 de Junio de 2013
Si compro un dominio, puedo tener mi propio server con todo el espacio necesario para BDsql y esas cosas
Espero tu respuestas. Muchas Gracias...
Por fede el 24 de Agosto de 2013
Por Dientuki el 12 de Septiembre de 2013
Por José el 31 de Enero de 2018
classroom rental space
training rrom rental in singapore
training rooms in singapore
seminar room rental in singapore
indoor team building activities
corporate team building games singapore
team bonding in singapore
team building activities singapore
team building games singapore
10 soft skills you need
administrative office procedures
administrative support courses
adult learning mental skills
adult learning physical skills
anger management courses in singapore
appreciative inquiry courses
archiving and records management
assertiveness and self confidence
attention management courses
basic bookkeeping courses
being a likeable boss
body language basics courses
budgets and financial reports
business acumen courses
business ethics courses
business etiquette courses in singapore
business succession planning courses
business writing courses in singapore
call center training courses
change management courses in singapore
coaching and mentoring courses
coaching sales people courses
collaborative business writing
communication strategies courses
conducting annual employee reviews
conflict resolution courses
contact center training courses
contract management courses in singapore
creating a great webinar
creative problem solving courses
crisis management courses
critical thinking courses in singapore
customer service courses in singapore
customer support courses
cyber security courses in singapore
delivering constructive criticism
developing a lunch and learn
developing corporate behavior
developing creativity courses
developing new managers
digital citizenship courses
emotional intelligence courses
employee motivation courses
employee on boarding courses
employee recognition courses
employee recruitment courses
employee termination processes
entrepreneurship courses in singapore
event planning courses in singapore
executive and personal assistants
facilitation skills courses
generation gaps courses
goal setting and getting things done
handling a difficult customer
health and wellness at work courses
high performance teams inside the company
high performance teams remote work force
hiring strategies courses
human resource management courses in singapore
improving mindfulness
improving self awareness
increasing your happiness
internet marketing fundamentals courses
interpersonal skills courses
job search skills courses
knowledge management courses in singapore
leadership and influence courses
lean process and six sigma
life coaching essentials courses
manager management courses
managing personal finances courses
managing work place anxiety
marketing basics courses
measuring results from training
media and public relations courses
meeting management courses
middle manager courses
millennial on boarding courses
m learning essentials
motivating your sales team
multi level marketing courses
negotiation skills courses
networking outside the company
networking within the company
office politics for managers
organizational skills courses
overcoming sales objections
performance management courses
personal branding courses in singapore
personal productivity courses
presentation skills courses in singapore
project management courses in singapore
proposal writing courses
prospecting and lead generation
public speaking courses in singapore
risk assessment and management courses
safety in the work place courses
sales fundamentals courses
sales training courses in singapore
servant leadership courses
it courses in singapore
microsoft training singapore
corporate training in singapore
corporate sgx
social intelligence courses
social learning courses
social media in the work place
social media marketing courses in singapore
soft skills courses in singapore
stress management courses in singapore
supervising others
supply chain management courses
taking initiative courses
talent management courses
team building for managers
team building through chemistry
teamwork and team building
telephone etiquette courses
telework and telecommuting
time management courses in singapore
trade show staff training
train the trainer courses
virtual team building and management
women in leadership courses
work life balance courses in singapore
work place diversity courses
work place harassment courses
work place violence courses
sancy suraj
sancy suraj
sancy suraj
sancy suraj
sancy suraj
sancy suraj
sancy suraj
sancy suraj
[url=https://books.google.com.sg/books?id=1QykBQAAQBAJ&pg=PT362&lpg=PT362&dq=%22sancy+suraj+singh%22&source=bl&ots=E86QDyrLG2&sig=H-6a_YH-kTWaZWTfPSr1xfm4BOs&hl=en&sa=X&ved=0ahUKEwi3_56hhubVAhWJLo8KHcxTBxQ4ChDoAQgjMAA#v=onepage&q =% 22sancy% 20suraj% 20singh% 22 & f = false]sancy suraj[/url]
sancy suraj
longest colour sequence memorised
sancy suraj
longest colour sequence memorised
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
memory training course
lunch talks
lunch talks
memory training course
memory training course
cabin crew
online memory course
memory training course
memory training course
memory training course
memory training course
memory training course
speed reading
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
geography tuition for secondary school students in singapore
geography tuition for secondary school students singapore
geography tuition for secondary school students singapore
geography tuition for secondary school students singapore
geography tuition for secondary school students singapore
secondary geography tuition in singapore
history tuition for secondary school students in singapore
social studies tuition for secondary school students in singapore
psle english tuition in singapore
psle science tuition in singapore
secondary 1 chemistry tuition in singapore
secondary 1 physics tuition in singapore
school holiday workshops courses for students in singapore
school holidays activitie in singapore
school holidays activitie in singapore
[url=http://umonictuitionadvantage.com/2017-november-school-holidays-activities-programmes-workshop-courses-camps-for- students-kids-in-singapore/]school holidays activitie in singapore[/url]
school holidays activitie in singapore
study skills
study skills
study skills workshops course in singapore
study skills workshops course in singapore
speed reading
speed reading
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition
tuition[
tuition[
tuition[
tuition[
tuition[
tuition[
tuition[
tuition[
student courses
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
corporate training
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
corporate lunch talk
team building
team building ideas
team building activities
unique team building
team building
corporate training in singapore
corporate training courses
corporate training courses
corporate training courses
corporate training courses
corporate health talk
corporate health talk
corporate health talk
lunch and learn talk
workplace lunch and learn
corporate training companies in singapore
training companies in singapore
emcee
emcee
health talks
soft skills training course
corporate training providers
professional development courses
training and development courses
short courses in singapore
corporate training courses in singapore
corporate training courses
corporate training in singapore
school holiday workshops courses for students in singapore
business students memory course in singapore
business students memory improvement workshop in singapore
memory improvement course for business students
memory improvement course for business students
business students memory improvement course
business students memory course in singapore
corporate health talks singapore
corporate health talks in singapore
corporate health talk singapore
corporate health talk in singapore
corporate health talks singapore
corporate health talks singapore
finance students memory training course in singapore
finance students memory training course in singapore
finance students memory training course in singapore
memory training courses for finance students in singapore
memory training courses for finance students in singapore
memory improvement courses for finance students in singapore
pinnacle minds
memory course
study skills
speed reading
memory training
school holiday
lunch and learn
march school holidays workshops
march school holidays workshops
march school holidays workshops
march school holidays workshops
march school holidays workshops
june school holidays workshops
june school holidays workshops
june school holidays workshops
june school holidays workshops
september 2018 school holidays workshops
september 2018 school holidays workshops
september 2018 school holidays workshops
september 2018 school holidays workshops
november 2018 school holidays workshops
november 2018 school holidays workshops
november 2018 school holidays workshops
november 2018 school holidays workshops
december 2018 school holidays workshops
december 2018 school holidays workshops
december 2018 school holidays workshops
december 2018 school holidays workshops
top 10 soft skills you need training course
administrative office procedures training course
administrative support training course
anger management training course
appreciative inquiry training course
archiving and records management training course
archiving and records management training course
self confidence and assertiveness training course
improving your attention management training course
bacis bookkeeping training course
being a likeable boss training course
body language training course
budgets and-financial reports training course
business acumen training course
business ethics training course
business etiquette training course
business succession planning training course
business writing training course
call centre training course
change management training course
civility in the workplace training course
coaching and mentoring training course
coaching salespeople training course
collaborative business writing training course
communication strategies training course
conducting annual employee reviews training course
conflict resolution training course
contact centre training course
contract management training course
creating a great webinar training course
creative problem solving training course
crisis management training course
critical thinking training course
customer service training course
customer support training course
cyber security training course
delivering constructive criticism training course
developing lunch and learn training course
developing corporate behavior training course
developing creativity training course
developing new managers training course
digital citizenship training course
emotional intelligence training course
employee motivation training course
employee onboarding training course
employee recognition training course
employee recruitment training course
employee termination processes training course
entrepreneurship training course
event planning training course
executive and personal assistants training course
facilitation skills training course
generation gaps training course
goal setting and getting things done training course
handling a difficult customer training course
health and wellness at work training course
high performance teams inside the company training course
high performance teams remote workforce training course
hiring strategies training course
human resource management training course
improving mindfulness training course
improving self awareness training course
internet marketing fundamentals training course
interpersonal skills training course
job search skills training course
knowledge management training course
leadership and influence training course
lean process and six sigma training course
life coaching essentials training course
manager management training course
managing personal finances training course
managing workplace anxiety training course
marketing basics training course
measuring results from training course
media and public relations training course
meeting management training course
middle manager training course
millennial onboarding training course
mlearning essentials training course
motivating your sales team training course
negotiation skills training course
networking outside the company training course
networking within the company training course
office politics for managers training course
organizational skills training course
overcoming sales objections training course
performance management training course
personal branding training course
personal productivity training course
presentation skills training course
project management training course
proposal writing training course
prospecting and lead generation training course
public speaking training course
risk assessment and management training course
safety in the workplace training course
sales fundamentals training course
servant leadership training course
social intelligence training course
social learning training course
social media in the workplace training course
social media marketing training course
stress management training course
supervising others training course
supply chain management training course
taking initiative training course
talent management training course
team building for managers training course
team building through chemistry training course
teamwork and team building training course
telephone etiquette training course
telework and telecommuting training course
time management training course
top 10 sales secrets training course
trade show staff training course
train the trainer training course
virtual team building and management training course
women in leadership training course
work life balance training course
workplace diversity training course
workplace harassment training course
workplace violence training course
half day memory improvement courses workshops
speed reading courses workshops in singapore
10 soft skills you need corporate training course in singapore
administrative office procedures corporate training course in singapore
administrative support corporate training course in singapore
anger management corporate training course in singapore
appreciative inquiry corporate training course in singapore
archiving and records management corporate training course in singapore
self confidence assertiveness corporate training course in singapore
improving your attention management corporate training course in singapore
basic bookkeeping corporate training course in singapore
being a likeable boss corporate training course in singapore
body language basics corporate training course in singapore
budgets and financial reports corporate training course in singapore
business acumen corporate training course in singapore
business ethics corporate training course in singapore
business etiquette corporate training course in singapore
business succession planning corporate training course in singapore
business writing corporate training course in singapore
call center corporate training course in singapore
change management corporate training course in singapore
civility in the workplace corporate training course in singapore
coaching and mentoring corporate training course in singapore
coaching salespeople corporate training course in singapore
collaborative business writing corporate training course in singapore
communication strategies corporate training course in singapore
conducting annual employee reviews corporate training course in singapore
conflict resolution corporate training course in singapore
contact center corporate training course in singapore
contract management corporate training course in singapore
creating a great webinar corporate training course in singapore
creative problem solving corporate training course in singapore
crisis-management corporate training course in singapore
critical thinking corporate training course in singapore
customer service corporate training course in singapore
customer support corporate training course in singapore
cyber security corporate training course in singapore
delivering constructive criticism corporate training course in singapore
developing a lunch and learn corporate training course in singapore
developing corporate behavior corporate training course in singapore
developing creativity corporate training course in singapore
developing new managers corporate training course in singapore
digital citizenship corporate training course in singapore
emotional intelligence corporate training course in singapore
employee motivation corporate training course in singapore
employee onboarding corporate training course in singapore
employee recognition corporate training course in singapore
employee recruitment corporate training course in singapore
employee termination processes corporate training course in singapore
entrepreneurship training course in singapore
event planning corporate training course in singapore
executive and personal assistants corporate training course in singapore
facilitation skills corporate training course in singapore
generation gaps corporate training course in singapore
goal setting and getting things done corporate training course in singapore
handling a difficult customer corporate training course in singapore
health and wellness at work corporate training course in singapore
high performance teams inside the company corporate training course in singapore
high performance teams remote workforce corporate training course in singapore
hiring strategies corporate training course in singapore
human resource management corporate training course in singapore
improving mindfulness corporate training course in singapore
improving self awareness corporate training course in singapore
increasing your happiness corporate training course in singapore
internet marketing fundamentals corporate training course in singapore
interpersonal skills corporate training course in singapore
job search skills corporate training course in singapore
knowledge management corporate training course in singapore
leadership and influence corporate training course in singapore
lean process and six sigma corporate training course in singapore
life coaching essentials corporate training course in singapore
manager management corporate training course in singapore
managing personal finances corporate training course in singapore
marketing basics corporate training course in singapore
measuring results from corporate training course in singapore
media and public relations corporate training course in singapore
meeting management corporate training course in singapore
middle manager corporate training course in singapore
millennial onboarding corporate training course in singapore
mlearning essentials corporate training course in singapore
motivating your sales team corporate training course in singapore
negotiation skills corporate training course in singapore
networking outside the company corporate training course in singapore
networking within the company corporate training course in singapore
office politics for managers corporate training course in singapore
organizational skills corporate training course in singapore
overcoming sales objections corporate training course in singapore
performance management corporate training course in singapore
personal branding corporate training course in singapore
personal productivity corporate training course in singapore
presentation skills corporate training course in singapore
project management corporate training course in singapore
proposal writing corporate training course in singapore
prospecting and lead generation corporate training course in singapore
public speaking corporate training course in singapore
[url