Tag: redhat

Linux : Cannot Access …. Input/output error

Posted on by Osama Mustafa in Operating system

/bin/ls: reading directory .: Input/output error
total 0

The above error indicate that i cannot access to the specific file on Linux, Delete not working. with root user as well.
so the error is not a problem to delete files, it’s a problem about the file system itself and/or an hardware problem, but before announce that it’s hardware issue 🙂 try the below solution :-

 Option #1:-

use command dmesg.

(display message or driver message) is a command on most Linux- and Unix-based operating systems that prints the message buffer of the kernel. Read about that command here

Option #2 ( worked for me)

Use Fsck command to detect filesystem error and fix it.

How !!!

  1.  First Umount File system ( that file located ). Using Umount command if it’s not able to un mount the file system use lsof command or fuser to check which user using this filesystem.
  2. run the fsck -y /dev/…………….. 
  3. mount file system again.
Fsck Command here
Cheers
Osama …

Enable FTP On Redhat

Posted on by Osama Mustafa in Operating system
to enable FTP on Redhat on you have to follow to follow the below step,you need to define which user will use the FTP, in this article i will use root user :

Edit the files /etc/vsftpd.ftpusers and /etc/vsftpd.user_list looks like :

#

# List of users denied access to the FTP server, see ftpusers(4).
#
root
daemon
bin
sys
adm
lp
uucp
nuucp
dladm
netadm
netcfg
smmsp
xvm
mysql
openldap
webservd
nobody
noaccess
nobody4
unknown
zfssnap
aiuser

and remove root user from each file.

You can control ftp as services from

/etc/init.d/vsftpd

Thank you
Osama Mustafa

unable to open connection to libvirt management daemon

Posted on by Osama Mustafa in Operating system
This error appear on red hat virtualization , the cause of this error because daemon for red hat virtualization is disabled :

chkconfig libvirtd on
service libvirtd start

Also you can enable it or check the status for libvirtd by :

/etc/init.d/libvirtd [status|start|stop]

Thank you
Osama mustafa

Redhat virtualization (KVM)

Posted on by Osama Mustafa in Operating system
I am So Proud Today to write this topic , after 14 Hours Of continuous working . I Enabled Virtualization On Redhat , Its was challenging to me ,  I feel for moment its impossible to enable it .

But After finishing KVM installation and see everything is working fine i knew its deserve every moments . I believe in what they say now ” Never Give Up ” . I posting this article today for the people who wants to learn something new. And if you face any problem you can contact me here, I Wrote this because there’s no much information about the package that you should install while you are working on Virtualization But Hope you will find this useful.

you can install the package from Redhat Media , some Package will Generate what called Package Dependency , You will start searching for missing Package on media with same name as appear to you . its waste of time , i will post under this topic the most important package that you need to install to avoid this error. 
Some Other Information you need to know To Check If KVM Support : 

Solution One Using :

/proc/cpuinfo , the output :


The flags to look out for are:

  • vmx — Intel VT-x, basic virtualization
  • svm — AMD SVM, basic virtualization
  • ept — Extended Page Tables, an Intel feature to make emulation of guest page tables faster.
  • vpid — VPID, an Intel feature to make expensive TLB flushes unnecessary when context switching between guests.
  • npt — AMD Nested Page Tables, similar to EPT.
  • tpr_shadow and flexpriority — Intel feature that reduces calls into the hypervisor when accessing the Task Priority Register, which helps when running certain types of SMP guests.
  • vnmi — Intel Virtual NMI feature which helps with certain sorts of interrupt events in guests.

Solution Two :

dmesg | less
 

The two messages to look out for are:

kvm: no hardware support and
kvm: disabled by bios

To load KVM:

Intel 

modprobe kvm_intel

 AMD :

modprobe kvm_amd
 
 
 


Package that you need to install (Sorted) :

 etherboot-zroms-kvm-5.4.4-10.el5.x86_64.rpm
 kmod-kvm-83-105.el5.x86_64.rpm
 celt051-0.5.1.3-0.el5.x86_64.rpm
 log4cpp-1.0-4.el5.x86_64.rpm
 qpixman-0.13.3-4.el5.x86_64.rpm
 qcairo-1.8.7.1-3.el5.x86_64.rpm
 qffmpeg-libs-0.4.9-0.15.20080908.el5.x86_64.rpm
 qspice-libs-0.3.0-39.el5.x86_64.rpm
 kvm-83-105.el5.x86_64.rpm
 cyrus-sasl-md5-2.1.22-5.el5.x86_64.rpm
 iscsi-initiator-utils-6.2.0.871-0.10.el5.x86_64.rpm
 bridge-utils-1.1-2.x86_64.rpm
 kvm-qemu-img-83-105.el5.x86_64.rpm
 gnome-python2-gnomekeyring-2.16.0-3.el5.x86_64.rpm
 gtk-vnc-0.3.8-3.el5.x86_64.rpm
 gtk-vnc-python-0.3.8-3.el5.x86_64.rpm
 xen-libs-3.0.3-94.el5.x86_64.rpm
 xen-devel-3.0.3-94.el5.x86_64.rpm
 libvirt-0.6.3-20.el5.x86_64.rpm
 virt-viewer-0.0.2-3.el5.x86_64.rpm
 libvirt-python-0.6.3-20.el5.x86_64.rpm
 python-virtinst-0.400.3-5.el5.noarch.rpm
 virt-manager-0.6.1-8.el5.x86_64.rpm

Some Other package you need to install for avoiding dependency error : 

xz-lib-***

xz-4.***

If you need to Run  convirt install the below package also (Sorted) :

kernel-xen-2.6.18-164.el5
xen-3.0.3-94.el5
gpg-pubkey-32a349c9-493c185a
socat-1.6.0.1-1.el5.rf
tunctl-1.5-2.el5
python-crypto-2.0.1-13.1.el5.kb.1
python-paramiko-1.7.4-1.el5
convirt-1.1-1.fedora 

 Thank you
Osama Mustafa

Oracle EBS installation

Posted on by Osama Mustafa in Application

Hi all ,
its taking long time for me to write new blog , any way in this article i am gonna talk about how to install oracle EBS on Linux – 64 V5 update 4, take in your consideration there’s no difference oracle ebs installation step,the difference is changing is the prerequisites for platforms .

you can check the prerequisites on meta-link DOC [ID 761566.1]
i will post link in the bottom of this article .

Before we begin the wild ride, there a few modifications that needs to be done to the system, a few packages need to be installed. I’ll assume that you have searched for quite a while and maybe you even tried to install the damn thing and ran into errors, so I’ll get right into the process. Here what we’re going to do:

  1. Install Development Tools
  2. Install required packages
  3. Modify the System Configuration and Kernel (don’t panic)
  4. Create Required Users
  5. Install Oracle Apps

1-install Development Tools

there’s easy way and hard way i prefer hard way since easy way take space on system and some package not needed for oracle

Easy way :

yum groupinstall "Development Tools"
Hard Way :
you need to check every package on OS if its installed or not

  • gcc-4.1.2-14.el5.x86_64
  • gcc-c++-4.1.2-14.el5.x86_64
  • glibc-2.5-18.i686 (32-bit)
  • glibc-2.5-18.x86_64
  • glibc-common-2.5-18.x86_64
  • glibc-devel-2.5-18.i386 (32-bit)
  • glibc-devel-2.5-18.x86_64
  • libgcc-4.1.2-14.el5.i386
  • libgcc-4.1.2-14.el5.x86_64
  • libstdc++-devel-4.1.2-14.el5.i386
  • libstdc++-devel-4.1.2-14.el5.x86_64
  • libstdc++-4.1.2-14.el5.i386
  • libstdc++-4.1.2-14.el5.x86_64
  • make-3.81-1.1.x86_64
  • gdbm-1.8.0-26.2.1.i386
  • gdbm-1.8.0-26.2.1.x86_64
  • libXp-1.0.0-8.1.el5.i386
  • libXp-1.0.0-8.1.el5.x86_64
  • libaio-0.3.106-3.2.i386
  • libaio-0.3.106-3.2.x86_64
  • libgomp-4.1.2-14.el5.x86_64
  • sysstat-7.0.0-3.el5.x86_64
  • util-linux-2.13-0.45.el5.x86_64
  • compat-libstdc++-296-2.96-138.i386
  • compat-libstdc++-33-3.2.3-61.i386

Additionally, the following RPMs are required for an 11gR1 Database (which is bundled with the 12.1.1 release) on the database tier:

  • compat-libstdc++-33-3.2.3-61.x86_64
  • elfutils-libelf-devel-0.125-3.el5.x86_64
  • elfutils-libelf-devel-static-0.125-3.el5.x86_64
  • libaio-devel-0.3.106-3.2.x86_64
  • unixODBC-2.2.11-7.1.i386
  • unixODBC-devel-2.2.11-7.1.i386
  • unixODBC-2.2.11-7.1.x86_64
  • unixODBC-devel-2.2.11-7.1.x86_64
  • kernel-headers-2.6.18-8.el5.x86_64
  • openmotif21-2.1.30-11.EL5.i3861
  • xorg-x11-libs-compat-6.8.2-1.EL.33.0.1.i386

Check Package by command : rpm -qa | grep “package name”
Ex:
rpm -qa | grep kernel-headers

if its installed the name of package will appear as result but if its not you need to install like the following :

rpm -ivh “package name that you need to install”.

* after install package called ” openmotif” you need to make the following command :

unlink /usr/lib/libXtst.so.6
ln -s /usr/X11R6/lib/libXtst.so.6.1 /usr/lib/libXtst.so.6

Modify the System Configuration and Kernel

Open /etc/sysctl.conf as root
then add the following lines at the end of the file :

#Oracle EBS R12.1.1 Kernel Settings
kernel.shmall = 2097152
kernel.shmmax = 4294967295
kernel.shmmni = 4096
kernel.sem = 256 32000 100 142
fs.file-max = 327679
net.ipv4.ip_local_port_range = 10000 65000
net.core.rmem_default=262144
net.core.rmem_max=262144
net.core.wmem_default=262144
net.core.wmem_max=4194304

Now lets apply the new settings
/sbin/sysctl –p

Add the following lines to the /etc/security/limits.conf file:

* hard nofile 65535
* soft nofile 4096
* hard nproc 16384
* soft nproc 2047

Add the following lines to the /etc/resolv.conf file:

options attempts:5
options timeout:15

Create Required Users

we need two Groups : groupadd oinstall groupadd dba
useradd -g oinstall -G dba oracle
passwd oracle
useradd -g oinstall -G dba apps
passwd apps

Create Oracle Base Folder

mkdir -p /u01/oracle/PROD
chown -R oravis:oinstall /u01
chmod -R 775 /u01/

Before installation make sure all media (STAGE) owned by Oracle:oinstall and permission is 775 .
before installation you need to change permission for ./rapidwiz like Following
chmod u+x STAGE_PATH/startCD/DISK1/rapidwiz/

Apply patch number 6078836 before installation becuase if you don’t the Post installation check will fail on HTTP error : RW-50015 , you find this patch in the bottom .

Start the installation and Good luck : ./rapidwiz


If you need patch or any thing please contact me here .

Downloadable Files :
Package May you will need : Redhat 5.4
Patch 6078836