[CentOS] Grow up load average, zombie processes, uninterruptible sleep

Maybe have u zombie processes ?

try:

top -b -n 1 | awk '{if (NR <=7) print; else if ($8 == "D") {print; count++} } END {print "Total status D: "count}'

ps aux | awk '{ print $8 " " $2 }' | grep -w Z

dmesg

find parent zombie proces ( first column )
 

ps -eo ppid,pid,user,stat,pcpu,comm,wchan:32 | grep pidZombieProcess

kill  [-9 -15]  pidParentZombieProcess

[Linux] Autostart services

chkconfig serviceName [on off]

[CentOS] Customize prompt

export PS1="\[\033[36m\][\t] \[\033[1;33m\]\u\[\033[0m\]@\h:\[\033[36m\][\w]:\[\033[0m\] "

[CentOS] Install google chrome

In terminal:

nano /etc/yum.repos.d/google-chrome.repo

paste for 32-bit

[google-chrome] 
name=google-chrome - 32-bit 
baseurl=http://dl.google.com/linux/chrome/rpm/stable/i386 
enabled=1 
gpgcheck=1 
gpgkey=https://dl-ssl.google.com/linux/linux_signing_key.pub

for 64-bit

[google-chrome] 

name=google-chrome - 64-bit 

baseurl=http://dl.google.com/linux/chrome/rpm/stable/x86_64 

enabled=1 

gpgcheck=1 

gpgkey=https://dl-ssl.google.com/linux/linux_signing_key.pub

and install

## Install Google Chrome Stable version ## 

yum install google-chrome-stable

## Install Google Chrome Beta version ## 

yum install google-chrome-beta

## Install Google Chrome Unstable version ## 

yum install google-chrome-unstable

[CentOS] * is not in the sudoers file. This incident will be reported.

run in terminal : 


su -
echo 'yourUsername ALL=(ALL) ALL' >> /etc/sudoers

[CentOS] Install skype

in terminal :

yum install libXrender.i686 libstdc++.i686 fontconfig.i686 pulseaudio-libs.i686 qt-x11.i686 qt.i686 glib2.i686 zlib.i686 freetype.i686 alsa-lib.i686 libXScrnSaver.i686 libXi.i686 libXv.i686 libXrandr.i686 libSM.i686

cd /tmp
wget http://download.skype.com/linux/skype_static-4.0.0.8.tar.bz2

mkdir /opt/skype
tar -xvf skype_static-4.0.0.8.tar.bz2 -C /opt/skype --strip-components=1

ln -s /usr/lib/libtiff.so.3 /usr/lib/libtiff.so.4

touch /usr/bin/skype
chmod 755 /usr/bin/skype

nano /usr/bin/skype

fill this:

#!/bin/sh
export SKYPE_HOME="/opt/skype"

$SKYPE_HOME/skype --resources=$SKYPE_HOME $*

and run

skype

[CentOS] Don't boot raid5 recover filesystem

When execute line below
 cat /proc/mdstat

you can see _ sign, your raid have fail disk to repair

UUU__

md0 : active raid5 sda1[0] sdb1[4] sdd1[3] sdc1[2](F) sdb1[1](F)



Loop restart with (recover filesystem)# prompt.
To repair try:

mdadm --assemble /dev/md0 --scan --force

[CentOS] Image resize, convert

yum install ImageMagick

Usage:

convert example.png example.jpg

convert example.png -resize 200 example.png

#width

convert example.png -resize x200 example.png

# height

If you have any problems try command below

yum install php-gd glib glib2 libpng libjpeg libtiff ghostscript freetype ImageMagick ImageMagick-perl

[CentOS] Installation from USB in Windows

CentOS Live USB Flash Drive in Windows:


Download liveusb-creator-x-x.zip and extract to your PC


Download CentOS-6*   .iso


Navigate to folder liveusb-creator and click liveusb-creator.exe to launch the tool


If you have any problems try UNetBootIn

[CentOS] Install wifi card

lspci -nn | grep -i net

02:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR8151 v1.0 Gigabit Ethernet [1969:1073] (rev c0) 03:00.0 Network controller [0280]: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) [168c:002a] (rev 01)

grep -i 168c /lib/modules/*/modules.alias | grep -i 002a /lib/modules/2.6.32-220.23.1.el6.x86_64/modules.alias:alias pci:v0000168Cd0000002Asv*sd*bc*sc*i* ath9k /lib/modules/2.6.32-279.5.2.el6.x86_64/modules.alias:alias pci:v0000168Cd0000002Asv*sd*bc*sc*i* ath9k /lib/modules/3.5.2-1.el6.elrepo.x86_64/modules.alias:alias pci:v0000168Cd0000002Asv*sd*bc*sc*i* ath9k

modprobe -r ath5x modprobe ath9x

service NetworkManager restart

[CentOS] unknown filesystem ntfs

wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpm

 

rpm -Uhv rpmforge-release-0.3.6-1.el5.rf.i386.rpm




yum install fuse fuse-ntfs-3g dkms dkms-fuse

[CentOS] Transaction Check Error

Transaction Check Error:
  package XXXXXXX (which is newer than YYYYYY) is already installed

# wykonaj polecenie poniżej

yum downgrade XXXXXXX

[CentOS] Problem z RPM YUM

W przypadku poniżeszego błędu:

unning rpm_check_debug
ERROR with rpm_check_debug vs depsolve:
xxxxx is needed by (installed) xxxx
Complete!
(1, [u'Please report this error in http://xxxx])

# wyświetl problemy

package-cleanup --problems







# zainstaluj ponownie problemowe paczki

rpm -Uvh --force *.rpm

[CentOS] Nie działa Yum "'module' object has no attribute 'HTTPSHandler'"

Reinstalacja yum

wget -c http://vault.centos.org/4.1/os/i386/CentOS/RPMS/yum-2.2.1-1.centos4.noarch.rpm
wget -c http://vault.centos.org/4.1/os/i386/CentOS/RPMS/rpm-python-4.3.3-9_nonptl.i386.rpm
rpm -i rpm-python-4.3.3-9_nonptl.i386.rpm
rpm -i yum-2.2.1-1.centos4.noarch.rpm

rpm -Uvh openssl-0.9.8e-12.el5.x86_64.rpm







Uwaga.
Problemy mogą wystąpić z wersją najlepiej pobrać najnowszą. W przypadku reinstalacji użyć opcji --force wtedy nadpisze pliki.

[CentOS] Openfire, czyli własny server jabber

Pobierz Openfire  http://www.igniterealtime.org/downloads/index.jsp
zainstaluj

rpm -Uvh openfire-3.7.0-1.i386.rpm   

sprawdź czy serwer jest uruchominy z konta root

service openfire status

jeśli nie jest to wykonaj

service openfire reload

sprawdź czy serwer jest uruchominy z konta root

service openfire status

Obsługa przez przeglądarkę internetową 

http://localhost:9090

Uwaga. W przypadku CentOS 64 bit należy wykonać

cd /opt/openfire/jre/bin 
cp java java.bak 
rm java 
ln -s /usr/bin/java java 
service openfire start

[ubuntu] Blokada /var/lib/dpkg/lock

Gdy widzimy napis poniżej to znaczy, że mamy zablokowany instalator innym procesem by go odblokować wykonaj komendę poniżej.

E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
uruchom w terminalu :

sudo fuser -vki /var/lib/dpkg/lock; sudo dpkg --configure -a