Categories
Linux

Linux- Free and opensource

Linux is a UNIX-like computer operating system assembled under the model of free and opensource Software development and distribution.

Linux is one of the leading operating system used in servers both in small scale and even large scale mission critical projects. More than 90% of the supercomputers existing in this century runs on one or the other variants of Linux.

The development of Linux is one of the most prominent examples of free and opensource software collaboration.: the underlying linux source code may be used, modified, and distributed – commercially or non commercially – by anyone under licenses such as GNU General public licenses..

Some popular mainstream linux distributions include Debian(And it’s derivatives such as ubuntu), Fedora, redhat and openSUSE. Linux distributions include the linux kernel, supporting utilities and libraries and a lot of other application software.

Free download links for various linux distro.

  1. Ubuntu desktop edition
  2. Ubuntu server edition
  3. Debian
  4. Fedora
  5. OpenSuse

 For more details on installing ubuntu, please visit here. Even you can experince the flavour of a linux distro with out installing it into your machine. Nowadays almost all linux distribution allows you to expereince it without installing.

For experiencing ubuntu  please visit UBUNTU TOUR or just download the ubuntu image from ubuntu official website, burn into a CD or DVD and just boot from the CD/DVD

Categories
Android

Android on it’s fifth Birthday

Android is a Linux-based operating system designed primarily for touchscreen mobile devices such as smartphones and tablet computers, developed by Google in

conjunction with the Open Handset Alliance.Initially developed by Android Inc, whom Google financially backed and later purchased in 2005.
Google releases the Android code as open source, under the Apache License.Android has a large community of developers writing applications (“apps”) that extend the functionality of devices, written primarily in a customized version of Java.They are available for download through Google Play.

Short History
1. The first android phone was sold in 2008.
2. And by 2010 end android has become the world’s leading smartphone platform overtaking Symbian.
3. Android holds about 70% of the market share as per the latest results out.

Different android versions released
1. 1.5 cupcake
2. 1.6 donut
3. 2.0, 2.1 Eclair
4. 2.2 Froyo
5. 2.3.X Gingerbread
6. 3.X.X Honeycomb
7. 4.0.X IcreamSandwich
8. 4.1.X, 4.2 JellyBean

Please see the usage share of different version of android released, (Data courtsey : Wikipedia)

Categories
Windows Windows 8

Great upgrade, great deal – windows 8 upgrade offer (limited)

Great upgrade, great deal – windows 8 upgrade offer (limited)

This offer is valid from October 26, 2012 until January 31, 2013 and is limited to five upgrade licenses per customer. To install Windows 8 Pro, customers must be running Windows XP SP3,Windows Vista, or Windows 7. Pricing varies by region and each independent reseller, and it depends on a variety of specific factors including exchange rate, local taxes, duties, fees, local market conditions, and other pricing considerations.

Please refer to the terms and conditions for windows 8 upgrade offer.

Clicking the below image link will download windows 8 Upgrade Assistant, which lets you know if your PC can upgrade to Windows 8 Pro, provides you with a compatibility report, and then walks you through the steps to purchase, download, and install. Run the Windows 8 Upgrade Assistant to make sure your PC can upgrade to Windows 8 Pro before purchase—you can run it without purchasing. Upgrade Assistant will collect certain information about your potential upgrade experience.

 

Categories
Linux

Extending a logical volume in a virtual machine running Red Hat or Cent OS

To extend the logical volume:Note: These steps only apply to EXT3 file systems.

Caution: VMware recommends having a complete backup of the virtual machine prior making these changes.
  1. Power off the virtual machine.
  2. Edit the virtual machine settings and extend the virtual disk size. For more information, see Increasing the size of a virtual disk (1004047). [Vmware Link ]
  3. Power on the virtual machine.
  4. Identify the device name, which is by default /dev/sda, and confirm the new size by running the command:# fdisk -l 
    Continue reading “Extending a logical volume in a virtual machine running Red Hat or Cent OS”
Categories
Databases

ORA-12162 TNS:net service name is incorrectly specified

This error mainly occurs due to incorrect ORACLE_SID value set.  Make sure you have set the ORACLE_HOME & ORACLE_SID value set properly.

Categories
Databases Errors oracle

ORA-01034: ORACLE Not Available

What to do when we get  errors  like ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist.

Solution:

The ORA-01034 is  simple error, it means that your database is down!  Oracle oerr utility notes this about the ORA-01034 error:

ORA-01034: ORACLE not available

Cause:

 Oracle was not started up. Possible causes include the following:

  • The SGA requires more space than was allocated for it.
  • The operating-system variable pointing to the instance is improperly defined.

Action: 

Refer to accompanying messages for possible causes and correct the problem mentioned in the other messages. If Oracle has been initialized, then on some operating systems, verify that Oracle was linked correctly. See the platform specific Oracle documentation.

You may find that you are experiencing ORA-01034 when attempting to upgrade your Oracle database.ORA-01034 is thrown during the attempt to upgrade because there is an invalid entry in one of the following files:

  1. /etc/oratab
  2. /var/opt/oracle/oratab

The ORA-01034 is a result of a discrepancy between ORACLE_HOME andORACLE_SID

To resolve ORA-01034, be sure that the ORACLE_HOME and ORACLE_SIDproperly match within the files /etc/oratab or /var/opt/oracle/oratab .

 

Categories
Databases

RCU:6107 DB Init Param error

While Installing Repository Creation Utility (RCU) Installation the following error occurs:

RCU:6107 DB Init Param Error

This can be removed simply by the following:

1. Login on your database with system user.

2. Write > show parameters processes (which will show the current value of processes).

3. If its value is less than 500 then write the following command:

ALTER SYSTEM SET PROCESSES=500 SCOPE=SPFILE;

4. Write > show parameters open_cursors (which will show the current value of open_cursors).

5. If its value is less than 500 then write the following command:

ALTER SYSTEM SET OPEN_CURSORS=500 SCOPE=SPFILE;

6. Restart your DB or system.

7. Start the installation now….

Categories
Databases

Oracle 11G: Starting the DB, listener and the enterprise manager console

Make sure all the necessary environment variables are set, especially the following variables.

  1. ORACLE_SID
  2. ORACLE_HOME
And follow the below steps to start, database, listener and enterprise manager(em) console
  • For db startup: 

             oracle@root.com$ sqlplus / as sysdba
SQL*Plus: Release 11.1.0.6.0 – Production on Sun Nov 9 22:52:26 2008
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to an idle instance.

SQL> startup;
ORACLE instance started.
Total System Global Area 1389391872 bytes
Fixed Size 1299848 bytes
Variable Size 838863480 bytes
Database Buffers 536870912 bytes
Redo Buffers 12357632 bytes
Database mounted.
Database opened.

SQL> exit
Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 – Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

  • Starting listener
              oracle@root.com$ lsnrctl start
  • Oracle Enterprise manager start
              oracle@root.com$  emctl start dbconsole
Now the enterprise manager server is started and can be accessed using the link on browser : https://hostname:1158/em
Thank u 🙂
Categories
Linux

Local Yum Setup for RHEL

The Yellowdog Updater, Modfied (YUM) is an Open-source command line package-management utility for RPM based Linux systems. YUM allows automatic updates, package and dependency management.

This article helps you in YUM setup in RHEL enviroments

1. Create RPM directory

root@technix#mkdir /RPMS

2. Copy all the rpm packages from disk to “/RPMS" directory

3. Install createrepo rpm

root@technix#rpm -ivh createrepo-0.4.11-3.el5.noarch.rpm

4. createrepo

root@technix# createrepo /RPMS

5. create a local repo file in /etc/yum.repos.d

root@technix#vi /etc/yum.repos.d/local.repo

& save the below lines

[local]
name=RHEL-$releasever - Local
baseurl=file:///RPMS/
gpgcheck=0
enabled=1

6. Make yum Cache, by executing

root@technix#yum makecache

Enjoy software updates locally.

Categories
Linux

Samba basic configuration in RHEL

The key to configuring Samba is its lone configuration file: smb.conf. A basic samba configuration for the smb.conf file is given below.

[global]
workgroup = SIMPLE
[SHARE]
comment = Common Share
path = /SHARE
read only = no
guest ok = yes

Prior to adding the confifuration to the smb.conf file, take a backup of the current smb.conf file.

and then add the directory to be shared.

******Keeping a local backup of smb.conf file***********

#cp /etc/samba/smb.conf /etc/samba/smb.conf.backup

******Create a share folder******

#mkdir /SHARE
******Give necessary permission********

#chmod 777 /SHARE

*******Add user for Share access*******

#smbpasswd -a root

give password, restart smb service enjoy sharing. 🙂