linux | clipping de internet

Archivo

Archive for the ‘linux’ Category

centos: Another MySQL daemon already running with the same unix socket

20 marzo 2014 clippingme Deja un comentario

Fuente: http://stackoverflow.com/questions/20407292/centos-another-mysql-daemon-already-running-with-the-same-unix-socket

I have a strange error when starting mysqld service

«Another MySQL daemon already running with the same unix socket.»

I’ve tried to list running services and stopping them but the same error happens when starting mysqld service

by the way I may remove the mysqld and reinstall it but will this remove the database too ?

your help is very appreciated

Solution:

To prevent the problem from occurring, you must perform a graceful shutdown of the server from the command line rather than powering off the server.

# shutdown -h now

This will stop the running services before powering down the machine.

Based on Centos, an additional method for getting it back up again when you run into this problem is to move mysql.sock:

# mv /var/lib/mysql/mysql.sock /var/lib/mysql/mysql.sock.bak

# service mysqld start

Restarting the service creates a new entry called mqsql.sock

Categorías: linux Etiquetas: centOS, mysql

Ver tráfico interface red en VMWare & Linux host

8 enero 2014 clippingme Deja un comentario

Primero activar el modo promiscuo en los adaptadores de red de VMWare: aká: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004099

Segundo: desde el Shell de un guest en Linux con privilegios root, ejecutar: «tcpdump -env -ttt -i <interface de red> host <ip a sniffar>»

p.e:

– «tcpdump -env -ttt -i eth0 host 192.168.0.169»

– «tcpdump -env -ttt -i eth0 host 192.168.0.169 and port 445»

Categorías: linux Etiquetas: esxi, howto, vmware

Linux increasing or decreasing TCP sockets timeouts (suse rcp connection timeout)

10 diciembre 2013 clippingme Deja un comentario

Fuente: http://www.cyberciti.biz/tips/linux-increasing-or-decreasing-tcp-sockets-timeouts.HTML

Fuente: http://www.cyberciti.biz/faq/making-changes-to-proc-filesystem-permanently/

Some time it is necessary to increase or decrease timeouts on TCP sockets. You can use /proc/sys/net/ipv4/tcp_keepalive_time to setup new value.

The number of seconds a connection needs to be idle before TCP begins sending out keep-alive probes. Keep-alives are only sent when the SO_KEEPALIVE socket option is enabled. The default value is 7200 seconds (2 hours).

For example set value to 2400 seconds:

echo 2400 > /proc/sys/net/ipv4/tcp_keepalive_time

You can make changes to /proc filesystem permanently using /etc/sysctl.conf

CentOS & mutt: instalación y configuración

22 enero 2013 clippingme Deja un comentario

En esta entrada vamos a instalar y configurar correctamente el envío de emails autenticados desde la línea de comandos.

Supongamos que haremos el envío desde el usuario linux «backups»

1- Instalar cliente de correo electrónico para enviar emails desde la línea de comandos

Instalar mutt

#sudo yum install mutt

2- configuración del fichero de mutt para la autenticación del email

guardar el fichero en el home del usuario, p.e. ~/backups/.muttrc

—-inicio susodicho fichero———–

set from = «backups@midominio.com»

set realname = «backups de midominio»

set imap_user = «backups@midominio.com»

set imap_pass = «blablabla»

set folder = «imaps://imap.1and1.es:993»

set spoolfile = «+INBOX»

set header_cache =~/.mutt/cache/headers

set message_cachedir =~/.mutt/cache/bodies

set smtp_url = «smtp://backups@midominio.com@smtp.1and1.es/»

set smtp_pass = «blablabla»

set from = «backups@midominio.com»

set move = no

set imap_keepalive = 900

—-final susodicho fichero———–

3- Es posible que en función de la plataforma, mutt devuelva un pete de error (p.e. “violación de segmento”, “Permission denied”, etc… . Para solventar este problema:

a) copy cp /etc/Muttrc to your users home directory and rename the file .muttrc-1.5.20

cp /etc/Muttrc /home/<usuario>/.muttrc-1.5.20

b) Assisgn the .muttrc-1.5.20 file the necessary permissions

chown <usuario>: <usuario> /home/<usuario>/.muttrc-1.5.20

c) open the file with your favorite text editor.

vi .muttrc-1.5.20

d) now replace Quote:

#set tmpdir=»»

with

Quote:

set tmpdir=»/tmp»

e) et voilà !

4- Verificar el envío desde la lína de comandos:

$ mutt -s «<subject>» -a <ruta y fichero a anexar> — <email destinatario> < ruta y fichero con el contenido del cuerpo del mensaje>

Categorías: linux Etiquetas: centOS, howto

CentOS & dropbox: instalación completa

22 enero 2013 clippingme Deja un comentario

1- (root) Creación usuario dropbox en centOS:

# useradd -s /bin/bash dropbox

# passwd dropbox

Nueva contraseña: xxxxxx

2- (root) Crear grupo para administración

# groupadd -r admin

3- (root)…Y para asignar un grupo creado a un usuario existente en el sistema operativo:

# gpasswd -a dropbox admin

4- (root) Añadir permisos sudo para el usuario dropbox

# visudo

… y añadir al final del fichero

%admin ALL=(ALL) ALL

5- instalación dropbox (con la cuenta usuario “dropbox”):

5.1- descargar e instalar la versión 64-bit:

cd ~ && wget -O – «https://www.dropbox.com/download?plat=lnx.x86_64» | tar xzf –

5.2- ejecutar el instalador. Es requisito que previamente esté dado de alta en dropbox, y la primera vez Solicitará ejecutar un enlace para vincular la cuenta del servicio local con dropbox.

~/.dropbox-dist/dropboxd

5.3- En la cónsola aparecerá una URL a visitar para realizar la vinculación con la cuenta de dropbox: https://www.dropbox.com/cli_link?host_id=host_id donde HOST_ID es el número de 128 bits correspondiente a nuestro identificador. Copiar toda la url completa ya que accederemos posteriormente para vincular la cuenta.

5.4 Desde un navegador, abrir la sesión correspondiente a la cuenta que queremos vincular con el equipo. Con la sesión abierta, en el navegador pegar la url completa obtenida en la cónsola Linux del paso anterior y acceder a dicha url. En dropbox solicitará de nuevo la contraseña de la cuenta creada previamente.

5.4- Una vez vinculadas las cuentas, tanto en la cónsola como en el navegador saldrá un breve mensaje que confirma que se han vinculado correctamente la cuentas.Comprobar si tenemos dropbox funcionando a estas alturas:

ps -ef |grep dropbox

… deberá salir una línea parecida:

dropbox 2926 2779 1 10:02 pts/2 00:00:05 /home/dropbox/.dropbox-dist/dropbox

6- Si queremos compartir las carpetas de otra aplicación o usuario, modificar los permisos de dicha carpeta para que el usuario «dropbox» tenga acceso

(en plan bestia…) chmod 777 /home/<usuario>

7- accede con la cuenta “dropbox” y crear enlaces simbólicos

# ln -s /home/<usuario>/fitxers / home /dropbox/Dropbox

# ln -s /home/<usuario>/irpf / home /dropbox/Dropbox

# ln -s /home/<usuario>/templates / home /dropbox/Dropbox

# ln -s /home/<usuario>/winsuite /home/dropbox/Dropbox

8- Con el usuario “root”, crear el script que de soporte como servicio a dropbox (gestionar servicio como /etc/init.d/dropbox {start-stop-status-restart})

copiar este script en /etc/init.d/dropbox y dar permisos de ejecución

poner en la variable DROPBOX_USERS=»dropbox» el usuario sobre el que se tiene arrancar el servicio dropbox (si hubiera más de uno, separarlos por espacios)

#——— inicio del susodicho script ————-

# chkconfig: 345 85 15

# description: Startup script for dropbox daemon

# processname: dropboxd

# pidfile: /var/run/dropbox.pid

# config: /etc/sysconfig/dropbox

### BEGIN INIT INFO

# Provides: dropboxd

# Required-Start: $local_fs $network $syslog

# Required-Stop: $local_fs $syslog

# Should-Start: $syslog

# Should-Stop: $network $syslog

# Default-Start: 2 3 4 5

# Default-Stop: 0 1 6

# Short-Description: Start up the Dropbox file syncing daemon

# Description: Dropbox is a filesyncing sevice provided by dropbox.com

# This service starts up the dropbox daemon.

### END INIT INFO

# Source function library.

. /etc/rc.d/init.d/functions

# To configure, add line with DROPBOX_USERS=»user1 user2″ to /etc/sysconfig/dropbox

# Probably should use a dropbox group in /etc/groups instead.

DROPBOX_USERS=»dropbox»

# [ -f /etc/sysconfig/dropbox ] && . /etc/sysconfig/dropbox

prog=dropboxd

lockfile=${LOCKFILE-/var/lock/subsys/$prog}

config=${CONFIG-/etc/sysconfig/dropbox}

RETVAL=0

start() {

echo -n $»Starting $prog»

if [ -z $DROPBOX_USERS ] ; then

echo -n «: unconfigured: $config»

echo_failure

echo

rm -f ${lockfile} ${pidfile}

RETURN=6

return $RETVAL

for dbuser in $DROPBOX_USERS; do

dbuser_home=`cat /etc/passwd | grep «$dbuser» | cut -d»:» -f6`

daemon –user $dbuser /bin/sh -c «$dbuser_home/.dropbox-dist/dropboxd&»

done

RETVAL=$?

echo

[ $RETVAL = 0 ] && touch ${lockfile}

return $RETVAL

}

status() {

for dbuser in $DROPBOX_USERS; do

dbpid=`pgrep -u $dbuser dropbox | grep -v grep`

if [ -z $dbpid ] ; then

echo «dropboxd for USER $dbuser: not running.»

else

echo «dropboxd for USER $dbuser: running (pid $dbpid)»

done

}

stop() {

echo -n $»Stopping $prog»

for dbuser in $DROPBOX_USERS; do

dbuser_home=`cat /etc/passwd | grep «^$dbuser:» | cut -d»:» -f6`

killproc $dbuser_home/.dropbox-dist/dropbox

done

RETVAL=$?

echo

[ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}

}

# See how we were called.

case «$1″ in

start)

start

;;

status)

status

;;

stop)

stop

;;

restart)

stop

start

;;

echo $»Usage: $prog {start|status|stop|restart}»

RETVAL=3

esac

exit $RETVAL

#——— fin del susodicho script ————-

8.1- asignar permisos de ejecución a este fichero:

chmod 755 /etc/init.d/dropbox

9- Con la cuenta “dropbox”, incorporar a crontab el arranque automático de dropbox como servicio

chkconfig –add dropbox

chkconfig dropbox on

Categorías: linux Etiquetas: centOS, dropbox, howto

How to send email from the command line – Gmail Mutt

18 enero 2013 clippingme Deja un comentario

Fuente: http://go2linux.garron.me/linux/2010/10/how-send-email-command-line-gmail-mutt-789

Para errores, consultar: http://www.centos.org/modules/newbb/viewtopic.php?topic_id=40210&forum=56

And sending email while working on the command line, is good, I use it to send me notes to myself, and sometimes to send configuration files as attachments.

Is also good to have an option configured to send emails from the command line, as a way to send messages from scripts.

I will show you now how to use mutt and gmail to enable a Linux computer to send email.

Install mutt

Arch Linux

sudo pacman -S mutt

Ubuntu

sudo aptitude install mutt

Configure mutt

To configure it, we need to create ~./muttrc and put inside the file this contents

set from = "user@gmail.com"
set realname = "Guillermo Garron"
set imap_user = "user@gmail.com"
set imap_pass = "password"
set folder = "imaps://imap.gmail.com:993"
set spoolfile = "+INBOX"
set postponed ="+[Gmail]/Drafts"
set header_cache =~/.mutt/cache/headers
set message_cachedir =~/.mutt/cache/bodies
set certificate_file =~/.mutt/certificates
set smtp_url = "smtp://user@smtp.gmail.com:587/"
set smtp_pass = "password"
set move = no 
set imap_keepalive = 900

Create the folders

mkdir -p /.mutt/cache

Change, for your user and your password, and you are done.

Sending emails

Now that mutt is configured it is ready to start sending emails.

mutt -s "Test from mutt" user@yahoo.com < /tmp/message.txt

And if you need to send an attachment

mutt -s "Test from mutt" user@yahoo.com < /tmp/message.txt -a /tmp/file.jpg

*-s «Test from mutt»* is the subject *-a /tmp/file.jpg* is the attachment */tmp/message.txt* is the message itself This is another way to write the test, having the body in the same line.

echo "This is the body" | mutt -s "Testing mutt" user@yahoo.com -a /tmp/XDefd.png

If you need to use send emails from a script, just use that line in the script, but be sure that is the user that has the `.muttrc` file in his / her home directory the one that runs the script.

If you liked this article please share it.

Categorías: linux Etiquetas: howto

Instalar como servicio dropbox en ambiente Linux

17 enero 2013 clippingme Deja un comentario

Fuente: http://archive.ianwinter.co.uk/2011/05/16/centos-and-dropbox/

Fuente: http://ubuntuservergui.com/ubuntu-server-guide/install-dropbox-ubuntu-server

Una vez hecho todos los pasos, incorporar a crontab el arranque automático de dropbox como servicio

@reboot <ruta usuario dropbox>/.dropbox-dist/dropboxd

Just because I can really I setup Dropbox syncing on one of my CentOS 5 servers. It’s a little bit of a faff, but, not that hard. The official guide is online, but, this is a shorten version and might not cover everything but it worked on my headless VM just fine.

First up su to whichever user you want to install Dropbox as. You’ll need two terminal’s open so fire them both up now. You’ll also need lynx, gcc and python installed so if you don’t have, sort that out with yum.

In your home directory grab the correct binary for you (x86 or x86_64).

1 2	`wget -O dropbox.tar.gz http://www.dropbox.com/download/?plat=lnx.x86` `wget -O dropbox.tar.gz http://www.dropbox.com/download/?plat=lnx.x86_64`

Now unpack it and start it up in your first terminal window.

1 2	`tar xvfz dropbox.tar.gz` `~/.dropbox-dist/dropboxd`

Now in your second terminal go to http://dropbox.com using lynx (lynx http://dropbox.com) and login, then using the key shortcut “g” paste in the URL that your first window should now be prompted you to go to. This is to register the machine with your Dropbox account. You’ll need to scroll down the page to re-enter your password. Once done the first window should say hello to you and it’ll quit.

Next up sort out the init.d script. Put the following in /etc/init.d/dropbox and chown 755 it when you’re done.

# chkconfig: 345 85 15

# description: Startup script for dropbox daemon

#

# processname: dropboxd

# pidfile: /var/run/dropbox.pid

# config: /etc/sysconfig/dropbox

#

### BEGIN INIT INFO

# Provides: dropboxd

# Required-Start: $local_fs $network $syslog

# Required-Stop: $local_fs $syslog

# Should-Start: $syslog

# Should-Stop: $network $syslog

# Default-Start: 2 3 4 5

# Default-Stop: 0 1 6

# Short-Description: Start up the Dropbox file syncing daemon

# Description: Dropbox is a filesyncing sevice provided by dropbox.com

# This service starts up the dropbox daemon.

### END INIT INFO

# Source function library.

. /etc/rc.d/init.d/functions

# To configure, add line with DROPBOX_USERS="user1 user2" to /etc/sysconfig/dropbox

# Probably should use a dropbox group in /etc/groups instead.

[ -f /etc/sysconfig/dropbox ] && . /etc/sysconfig/dropbox

prog=dropboxd

lockfile=${LOCKFILE-/var/lock/subsys/$prog}

config=${CONFIG-/etc/sysconfig/dropbox}

RETVAL=0

start() {

echo -n $"Starting $prog"

if [ -z $DROPBOX_USERS ] ; then

echo -n ": unconfigured: $config"

echo_failure

echo

rm -f ${lockfile} ${pidfile}

RETURN=6

return $RETVAL

fi

for dbuser in $DROPBOX_USERS; do

daemon --user $dbuser /bin/sh -c "/home/$dbuser/.dropbox-dist/dropboxd&"

done

RETVAL=$?

echo

[ $RETVAL = 0 ] && touch ${lockfile}

return $RETVAL

}

status() {

for dbuser in $DROPBOX_USERS; do

dbpid=`pgrep -u $dbuser dropbox | grep -v grep`

if [ -z $dbpid ] ; then

echo "dropboxd for USER $dbuser: not running."

else

echo "dropboxd for USER $dbuser: running (pid $dbpid)"

fi

done

}

stop() {

echo -n $"Stopping $prog"

for dbuser in $DROPBOX_USERS; do

killproc /home/$dbuser/.dropbox-dist/dropbox

done

RETVAL=$?

echo

[ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}

}

# See how we were called.

case "$1" in

start)

start

;;

status)

status

;;

stop)

stop

;;

restart)

stop

start

;;

*)

echo $"Usage: $prog {start|status|stop|restart}"

RETVAL=3

esac

exit $RETVAL

Edit /etc/sysconfig/dropbox and add the following line to match your linux account where you’ve installed Dropbox.

1	`DROPBOX_USERS="linux_user_name"`

Make sure it starts on boot.

1	`chkconfig dropbox on.`

That’s it. Enjoy.

Jan van der Lugt • a day ago

Great script! Better yet, only grep if $dbuser occurs at the start of the line and ends with a semicolon (to avoid matching of a partial username). Same fix for stopping.

45c45,46
< daemon –user $dbuser /bin/sh -c «/home/$dbuser/.dropbox-dist/dropboxd&»
—
> dbuser_home=`cat /etc/passwd | grep «^$dbuser:» | cut -d»:» -f6`
> daemon –user $dbuser /bin/sh -c «$dbuser_home/.dropbox-dist/dropboxd&»
67c68,69
< killproc /home/$dbuser/.dropbox-dist/dropbox
—
> dbuser_home=`cat /etc/passwd | grep «^$dbuser:» | cut -d»:» -f6`
> killproc $dbuser_home/.dropbox-dist/dropbox
0
•
Reply
•
Share ›
Simon Inglis • 8 months ago

Thanks for the script. Here’s a minor improvement to handle user home directories that aren’t under /home (as is the case with my Jenkins install)

45c45,46
dbuser_home=`cat /etc/passwd | grep «$dbuser» | cut -d»:» -f6`
> daemon –user $dbuser /bin/sh -c «$dbuser_home/.dropbox-dist/dropboxd&»
0
•
Reply
•
Share ›
steve • a year ago

merci!
Put the above in /etc/init.d/dropbox and chmod 755 it when you’re done.
not chown;
thank you!
0
•
Reply
•
Share ›
Robert Son Hedler • a year ago
- −
Thank you very much, it works very well!!!

Categorías: linux Etiquetas: administración sistemas, centOS

Older Entries

clipping de internet

Archivo

centos: Another MySQL daemon already running with the same unix socket

Ver tráfico interface red en VMWare & Linux host

Linux increasing or decreasing TCP sockets timeouts (suse rcp connection timeout)

Further reading

CentOS & mutt: instalación y configuración

CentOS & dropbox: instalación completa

How to send email from the command line – Gmail Mutt

Install mutt

Configure mutt

Sending emails

Instalar como servicio dropbox en ambiente Linux

Random Posts

Categorías

Sitios de interés

Archivos

Meta

Archivo

Further reading

Install mutt

Configure mutt

Sending emails

Random Posts

Nube de etiquetas

Categorías

Sitios de interés

Archivos

Meta