- rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
- rpm -Uvh http://li.nux.ro/download/nux/dextop/el6/x86_64/nux-dextop-release-0-2.el6.nux.noarch.rpm
- yum info vlc
- yum install vlc
learn linux, linux expert
Sunday 12 June 2016
Install VLC PLAYER IN CENTOS
Wednesday 21 October 2015
Reinstall a corrupted or destroyed boot partition. How to install Adobe Reader on Centos 6
How to install Adobe Reader on Centos 6
yum localinstall http://linuxdownload.adobe.com/linux/i386/AdbeRdr9.5.5-1_i486linux_enu.rpm
or
yum localinstall http://linuxdownload.adobe.com/linux/x86_64/adobe-release-x86_64-1.0-1.noarch.rpm
or
yum localinstall http://linuxdownload.adobe.com/linux/x86_64/adobe-release-x86_64-1.0-1.noarch.rpm
cannot create key change index database disk image is malformed
#yum clean all
#yum clean metadata
#yum clean dbcache
or
#yum history new
then
#yum makecache
#yum clean metadata
#yum clean dbcache
or
#yum history new
then
#yum makecache
Yum segmentation fault ( core dumped )
#rm -rf /var/lib/rpm/__db.*
#rpm --rebuilddb
#yum clean all
#yum makecache
Error : cannot retreive metalink for repository : epel. Please verify its path and try again
#sed -i "s/mirrorlist=https/mirrorlist=http/" /etc/yum.repos.d/epel.repo
#yum check-update
Running these commands will update the repo to use HTTP rather than HTTPS
#yum check-update
Running these commands will update the repo to use HTTP rather than HTTPS
ftp issue 500: oops : cannot change directory
#getenforce ( Selinux status )
enforcing ( if output)
#getsebool -a | grep ftp
check for ftp_home_dir ---- off
if it is in off state then
#setsebool -P ftp_home_dir 1 ( or on )
hence problem solved
enforcing ( if output)
#getsebool -a | grep ftp
check for ftp_home_dir ---- off
if it is in off state then
#setsebool -P ftp_home_dir 1 ( or on )
hence problem solved
Reinstall a corrupted or destroyed boot partition.
deleted mistakenly. Even though I could not boot the system, I did not want to reinstall the whole
system and recover the data from backups.
1. Boot the computer into rescue mode with the relevant CD/DVD by typing "linux rescue" at the boot prompt.
2. Mount the / partition of the system. On CentOS this is automatically done and the / is mounted on /mnt/sysimage.
Otherwise just do (assuming the root partition is on /dev/sda2)
mount /dev/sda2 /mnt/sysimage |
chroot /mnt/sysimage |
e2label /dev/sda1 /boot |
mount /dev/sda1 /boot |
mkdir /media/cdrom mount -o loop,ro /dev/hdc /media/cdrom |
cd /media/cdrom/CentOS (this will vary depending on the distro) rpm -ivh --force kernel-2.6.18-164.el5.i686.rpm rpm -Uvh --force grub-0.97-13.5.i386.rpm rpm -Uvh --force redhat-logos-4.9.99-11.el5.centos.noarch.rpm |
grub-install /dev/sda1 (or whichever partition boot is mounted on) |
vim /boot/grub/grub.conf
default=0 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS root (hd0,0) kernel /vmlinuz-6.18-164.el5 ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.18-164.el5.img |
cd /boot/grub ln -s grub.conf menu.lst |
Wednesday 12 August 2015
How to Set or Increase Memory Heap Size in Apache Tomcat
By default Tomcat server sets its own memory heap size 64MB but its not
enough for run your application, so we can set size by CATALINA_OPTS or
JAVA_OPTS,
-Xmx set Maximum Java Heap Size
-Xms set Initial Java Heap Size
-Xms set Initial Java Heap Size
Option 1:
Open the catalina.sh script file under $CATALINA_HOME/bin/catalina.sh
directory assign it,
1
2
| export CATALINA_OPTS= "-Xms128M -Xmx512M" |
or simply export,
1
2
| export CATALINA_OPTS= "-Xms128M -Xmx512MB" |
The heap size has been set to Minumum 128MB and maximum 512MB
Option 2:
$CATALINA_HOME/bin/setenv.sh
Another option is create a setenv.sh file and add below line,
1
2
| export CATALINA_OPTS= "${CATALINA_OPTS}
-Djava.awt.headless=true
-Dorg.apache.jasper.runtime.BodyContentImpl.LIMIT_BUFFER=true
-Dmail.mime.decodeparameters=true -Xms128m -Xmx512m -XX:PermSize=256m
-XX:MaxPermSize=950m -XX:+CMSClassUnloadingEnabled
-XX:+CMSPermGenSweepingEnabled" |
or
1
| export CATALINA_OPTS= "-Xms128M -Xmx512MB" |
You might restart tomcat server,
# pkill -9 java
# /usr/local/apache-tomcat/bin/startup.sh
# ps aux | grep java
# /usr/local/apache-tomcat/bin/startup.sh
# ps aux | grep java
1
2
3
| root 9447 1.1 13.2 2127844 543868 ? Sl 17:20 3:38 /usr/java/jdk1 .7.0 /bin/java -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.util.logging.config. file = /usr/local/tomcat7/conf/logging .properties -Djava.awt.headless= true -Dorg.apache.jasper.runtime.BodyContentImpl.LIMIT_BUFFER= true -Dmail.mime.decodeparameters= true -Xms128m -Xmx512m -XX:MaxPermSize=512m -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -Djava.endorsed. dirs = /usr/local/tomcat7/endorsed -classpath : /usr/local/tomcat6/bin/bootstrap .jar: /usr/local/tomcat7/bin/commons-logging-api .jar -Dcatalina.base= /usr/local/tomcat7 -Dcatalina.home= /usr/local/tomcat7 -Djava.io.tmpdir= /usr/local/tomcat6/temp org.apache.catalina.startup.Bootstrap start root 12761 0.0 0.0 103244 868 pts /0 S+ 22:24 0:00 grep java |
or can use netstat command,
# netstat -anp | grep java
1
2
3
4
5
6
7
| tcp 0 0 :::8009 :::* LISTEN 9447 /java tcp 0 0 :::8080 :::* LISTEN 9447 /java tcp 0 0 ::ffff:127.0.0.1:8005 :::* LISTEN 9447 /java tcp 0 0 ::ffff:127.0.0.1:35334 ::ffff:127.0.0.1:3306 ESTABLISHED 9447 /java tcp 0 0 ::ffff:127.0.0.1:56156 ::ffff:127.0.0.1:3306 ESTABLISHED 9447 /java unix 2 [ ] STREAM CONNECTED 113825 9447 /java |
Windows Server:
To set in windows operating system, Create a setenv.bat file and add the below line,
1
| export JAVA_OPTS= "-server -Xmx512m" |
or
1
| set JAVA_OPTS= "-Xms256m -Xmx512m" |
Error:
If you may get an error java.lang.OutOfMemoryError: PermGen space in both windows or linux system,
Configure the MaxPermSize value in setenv.sh or catalina.sh like,
1
2
| export JAVA_OPTS= "-Xms256m -Xmx512m -XX:MaxPermSize=128m" |
If you have changed any configuration might restart tomcat server.
Friday 24 July 2015
Webacula Monitoring getting blank page/ How to get the Webacula login page
When you run webacula monitoring :
1.If
you get the blank page then check the below command
#psql
-h localhost -U postgres -d bacula
the
output should be:
psql
(9.2.4)
Type
"help" for help.
bacula=#
if
you get the error like below:
psql:
could not connect to server : connection refused.
Is
the server running on the localhost and accepting Tcp/Ip connection
on port 5432?
Then
run the below command
#setsebool
-P httpd_can_network_connect 1
And
disable selinux:
#cd
/etc/sysconfig
#vi
selinux
Add
the below line and save the file
SELINUX=disabled
#SELINUX=enforcing
/* comment this line*/
2.Error:
In /etc/httpd/conf.d/errorlog /var/www/html/webacula/data/cache not
exists
Solution:
#chmod
-R 777 /var/www/html/webacula/data/cache
3.Error:
httpd could not reliably determine the server's fully qualified
domain
Solution:
Add the below line in /etc/httpd/conf/httpd.conf
#cd
/etc/httpd/conf
#vim
httpd.conf
ServerName
localhost
And
save the file.
Now
restart the httpd
#service
httpd restart
4.While
creating postgresql tables if you get the error like below
role
“root” does not exist
Then
#su
– postgres
#psql
#CREATE
ROLE root;
#ALTER
ROLE root LOGIN;
Now
create postgresql tables.
5.Check
the webacula tables
#su
– postgres
#psql
#\c
bacula
Owner
of webacula tables should be postgres otherwise change it.
#ALTER
TABLE <table name> OWNER TO postgres;
like
this do for all tables.
httpd could not reliably determine the server's fully qualified domain
Error:
httpd could not reliably determine the server's fully qualified
domain
Solution:
Add the below line in /etc/httpd/conf/httpd.conf
#cd
/etc/httpd/conf
#vim
httpd.conf
ServerName
localhost
And
save the file.
Now
restart the httpd
#service
httpd restart
How to upgrade firefox on centos6/Rhel/Fedora
Download repo:
#wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm #rpm -Uvh epel-release-6-8.noarch.rpm
#wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
#rpm -Uvh remi-release-6.rpm
#yum --enablerepo=remi list firefox
#yum --enablerepo=remi install firefox
#firefox
#cd /usr/local
Download firefox 36:
#wget http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/36.0.1/linux-x86_64/en-US/firefox-36.0.1.tar.bz2
#tar xvjf firefox-36.0.1.tar.bz2
#ln -s /usr/local/firefox/firefox /usr/bin/firefox
#firefox &
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