Linux - :D All About Open Source :) ......

Sunday, December 5, 2010

Create your own Forums on Cent OS AMIs

[ec2-user@ip-10-112-7-1 ~]$ sudo yum install mysql mysql-server httpd php php-mysql php-gd php-imap php-ldap php-odbc php-pear php-xml php-xmlrpc phpmyadmin

[ec2-user@ip-10-112-7-1 ~]$ sudo service httpd restart
Stopping httpd:                                            [FAILED]
Starting httpd:                                            [ OK ]
[ec2-user@ip-10-112-7-1 ~]$ sudo service mysqld restart
Stopping mysqld:                                           [ OK ]
Initializing MySQL database: Installing MySQL system tables...
OK
Filling help tables...
OK

To start mysqld at boot time you have to copy
support-files/mysql.server to the right place for your system

PLEASE REMEMBER TO SET A PASSWORD FOR THE MySQL root USER !
To do so, start the server, then issue the following commands:

/usr/bin/mysqladmin -u root password 'new-password'
/usr/bin/mysqladmin -u root -h ip-10-112-7-1 password 'new-password'

Alternatively you can run:
/usr/bin/mysql_secure_installation

which will also give you the option of removing the test
databases and anonymous user created by default. This is
strongly recommended for production servers.

See the manual for more instructions.

You can start the MySQL daemon with:
cd /usr ; /usr/bin/mysqld_safe &

You can test the MySQL daemon with mysql-test-run.pl
cd /usr/mysql-test ; perl mysql-test-run.pl

Please report any problems with the /usr/bin/mysqlbug script!

                                                           [ OK ]
Starting mysqld:                                           [ OK ]

[ec2-user@ip-10-112-7-1 ~]$ wget http://vanillaforums.org/uploads/addons/LABOJ70HFYO0.zip
--2010-12-06 05:41:39-- http://vanillaforums.org/uploads/addons/LABOJ70HFYO0.zip
Resolving vanillaforums.org... 67.23.13.227
Connecting to vanillaforums.org|67.23.13.227|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2977490 (2.8M) [application/zip]
Saving to: “LABOJ70HFYO0.zip”

100%[======================================>] 2,977,490   3.36M/s   in 0.8s

2010-12-06 05:41:40 (3.36 MB/s) - “LABOJ70HFYO0.zip” saved [2977490/2977490]

[ec2-user@ip-10-112-7-1 ~]$ unzip LABOJ70HFYO0.zip -d /var/www/html

Thursday, December 2, 2010

Backup and Restore a Subversion Repository

First, here's how back up the repository to a compressed file:

$ svnadmin dump /path/to/repo | gzip > backup.gz

And how to restore it:

$ gunzip -c backup.gz | svnadmin load /path/to/repo

Those commands are meant for UNIX or Linux so you will have to adapt 
them if you are running Windows. It shouldn't be too difficult to do so,
 especially if you are using Cygwin.

Wednesday, December 1, 2010

What is the difference between Hard Link and Soft Link in Linux

Hard link: Hard link refers to "The specific location of physical data".

Hard Link is a mirror copy of the original file.
Hard links share the same inode.
Any changes made to the original or Hard linked file will reflect the other.
Even if you delete any one of the files, nothing will happen to the other hard links.
But soft link which points to deleted hard link become a dangling soft link.
You can't link a directory even within the same file system.
Hard links can't cross file systems.

Soft link( also called symbolic link): Soft link refers to "A symbolic path indicating the abstract location of another file".

Soft Link is a symbolic link to the original file.(more like windows shortcuts)
Soft Links will have a different Inode value.
Any changes made to the soft link will reflect the original file and its hard links.
A soft link points to the original file. If you delete the original file, the soft link fails. It would become dangling symbolic link.
If you delete the soft link, nothing will happen.
You can link a directory using soft link on same file system and also on other file system.
Soft links can cross file systems

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