A single computer using apache web server can serve as multiple websites as if they are on separate hosts using the same concept. There are two ways to do it.

1. Creating an ip-based virtual host

2. Creating a name-based virtual host

For hosting multiple sites using ip addresses.

NameVirtualHost *

<VirtualHost *>

ServerAdmin mail@navindutta.com

DocumentRoot /home/navindutta/public_html

</VirtualHost>

<VirtualHost XXX.XXX.XXX.102>

ServerAdmin mail@navin.com

DocumentRoot /home/navin/public_html

</VirtualHost>

<VirtualHost XXX.XXX.XXX.103>

ServerAdmin mail@nave.com

DocumentRoot /home/nave/public_html

</VirtualHost>

For multiple web domains on the same computer

NameVirtualHost *

<VirtualHost *>

ServerName www.navindutta.com

ServerAlias navindutta.com

ServerAdmin mail@navindutta.com

DocumentRoot /home/navindutta/public_html

</VirtualHost>

<VirtualHost XXX.XXX.XXX.102>

ServerName www.navin.com

ServerAlias navin.com

ServerAdmin mail@navin.com

DocumentRoot /home/navin/public_html

</VirtualHost>

<VirtualHost XXX.XXX.XXX.103>

ServerName www.nave.com

ServerAlias nave.com

ServerAdmin mail@nave.com

DocumentRoot /home/nave/public_html

</VirtualHost>

# Only apply to URLs on this domain
RewriteCond %{HTTP_HOST} ^(www.)?mysite.com$

# Only apply to URLs that aren’t already under folder.
RewriteCond %{REQUEST_URI} !^/moodledir/

# Don’t apply to URLs that go to existing files or folders.
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

# Rewrite all those to insert /folder.
RewriteRule ^(.*)$ /moodledir/$1

# Also redirect the root folder.
RewriteCond %{HTTP_HOST} ^(www.)?mysite.com$
RewriteRule ^(/)?$ moodledir/index.php [L]

Please note that this would work for all file url requests like view.php or index.php but not file.php requests. Another rule needs to be written for that.

#rsync -av -e ssh sourse/ username@newserver.com:/path/to/destination/

2. Dump your Moodle database and import it it new server

#mysqldump –allow-keywords –opt -uMySQL_USERNAME -pPASSWORD DATABASE | ssh username@newserver.com “mysql -uMySQL_USERNAME -pPASSWORD DATABASE”

3. Edit config.php to update all database access details, file paths and web location

Finally test everything and fix any link errors using http://newserver.com/moodle/admin/replace.php Thats all

Options +Indexes
## block a few types of files from showing
IndexIgnore *.wmv *.mp4 *.avi

Disable Directory Browsing

Options All -Indexes

Customize Error Messages

ErrorDocument 403 /forbidden.html
ErrorDocument 404 /notfound.html
ErrorDocument 500 /servererror.html

Get SSI working with HTML/SHTML

AddType text/html .html
AddType text/html .shtml
AddHandler server-parsed .html
AddHandler server-parsed .shtml
# AddHandler server-parsed .htm

Change Default Page (order is followed!)

DirectoryIndex myhome.htm index.htm index.php

Block Users from accessing the site

<limit GET POST PUT>
order deny,allow
deny from 202.54.122.33
deny from 8.70.44.53
deny from .spammers.com
allow from all
</limit>

Allow only LAN users

order deny,allow
deny from all
allow from 192.168.0.0/24

Redirect Visitors to New Page/Directory

Redirect oldpage.html http://www.domainname.com/newpage.html
Redirect /olddir http://www.domainname.com/newdir/

Block site from specific referrers

RewriteEngine on
RewriteCond %{HTTP_REFERER} site-to-block\.com [NC]
RewriteCond %{HTTP_REFERER} site-to-block-2\.com [NC]
RewriteRule .* - [F]

Block Hot Linking/Bandwidth hogging

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?mydomain.com/.*$ [NC]
RewriteRule \.(gif|jpg)$ - [F]

Want to show a “Stealing is Bad” message too?

Add this below the Hot Link Blocking code:

RewriteRule \.(gif|jpg)$ http://www.mydomain.com/dontsteal.gif [R,L]

Stop .htaccess (or any other file) from being viewed

<files file-name>
order allow,deny
deny from all
</files>

Avoid the 500 Error

# Avoid 500 error by passing charset
AddDefaultCharset utf-8

Grant CGI Access in a directory

Options +ExecCGI
AddHandler cgi-script cgi pl
# To enable all scripts in a directory use the following
# SetHandler cgi-script

Password Protecting Directories

Use the .htaccess Password Generator and follow the brief instructions!

Change Script Extensions

AddType application/x-httpd-php .gne

gne will now be treated as PHP files! Similarly, x-httpd-cgi for CGI files, etc.

Use MD5 Digests

Performance may take a hit but if thats not a problem, this is a nice option to turn on.

ContentDigest On

The CheckSpelling Directive

From Jens Meiert: CheckSpelling corrects simple spelling errors (for example, if someone forgets a letter or if any character is just wrong). Just add CheckSpelling On to your htaccess file.

The ContentDigest Directive

As the Apache core features documentation says: “This directive enables the generation of Content-MD5 headers as defined in RFC1864 respectively RFC2068. The Content-MD5 header provides an end-to-end message integrity check (MIC) of the entity-body. A proxy or client may check this header for detecting accidental modification of the entity-body in transit.

Note that this can cause performance problems on your server since the message digest is computed on every request (the values are not cached). Content-MD5 is only sent for documents served by the core, and not by any module. For example, SSI documents, output from CGI scripts, and byte range responses do not have this header.”

To turn this on, just add ContentDigest On.

Enable Gzip – Save Bandwidth

# BEGIN GZIP
<ifmodule mod_deflate.c>
# Combine the below two lines - I've split it up for presentation
AddOutputFilterByType DEFLATE text/text text/html text/plain text/xml text/css
  application/x-javascript application/javascript
</ifmodule>
# END GZIP

Turn off magic_quotes_gpc

# Only if you use PHP
<ifmodule mod_php4.c>
php_flag magic_quotes_gpc off
</ifmodule>

Set an Expires header and enable Cache-Control

<ifmodule mod_expires.c>
  ExpiresActive On
  ExpiresDefault "access plus 1 seconds"
  ExpiresByType text/html "access plus 7200 seconds"
  ExpiresByType image/gif "access plus 518400 seconds"
  ExpiresByType image/jpeg "access plus 518400 seconds"
  ExpiresByType image/png "access plus 518400 seconds"
  ExpiresByType text/css "access plus 518400 seconds"
  ExpiresByType text/javascript "access plus 216000 seconds"
  ExpiresByType application/x-javascript "access plus 216000 seconds"
</ifmodule>

<ifmodule mod_headers.c>
  # Cache specified files for 6 days
  <filesmatch "\.(ico|flv|jpg|jpeg|png|gif|css|swf)$">
  Header set Cache-Control "max-age=518400, public"
  </filesmatch>
  # Cache HTML files for a couple hours
  <filesmatch "\.(html|htm)$">
  Header set Cache-Control "max-age=7200, private, must-revalidate"
  </filesmatch>
  # Cache PDFs for a day
  <filesmatch "\.(pdf)$">
  Header set Cache-Control "max-age=86400, public"
  </filesmatch>
  # Cache Javascripts for 2.5 days
  <filesmatch "\.(js)$">
  Header set Cache-Control "max-age=216000, private"
  </filesmatch>
</ifmodule>

#yum install sshfs fuse-sshfs

Once you have installed sshfs we can use it to connect to any server which allows ssh access

#mkdir /mnt/moodle_server

#sshfs user@server.com:/home/abcd/public_html/moodle /mnt/moodle_server/

Enter password and you re done.

Now lets say we want to debug this system locally so we will mount our system in the /var/www/html so that our apache can read it

#sshfs user@server.com:/home/abcd/public_html/moodle /var/www/html/moodle_server

ssh-keygen -t rsa

scp ~/.ssh/id_rsa.pub user@server.com:~/.

ssh user@server.com
cat ~/id_*.pub >> ~/.ssh/authorized_keys

 ssh-copy-id -i ~/.ssh/id_rsa.pub user@server.com

sudo gnome-terminal

ssh remoteuser@remote.machine.address
chmod 0600 ~/.ssh/authorized_keys

ssh user@server.com

sudo sshfs user@server:/Directory/to/mount /var/www/html/moodle_server

<div id=”containerdiv1″></div>

<script src=”http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js” type=”text/javascript” charset=”utf-8″></script>

<script type>

// Accepts a url and a callback function to run.

function requestCrossDomain( site, callback ) {

/*

// If no url was passed, exit.

if ( !site ) {

alert(’No site was passed.’);

return false;

}

*/

// Take the provided url, and add it to a YQL query. Make sure you encode it!

var yql = ‘http://query.yahooapis.com/v1/public/yql?q=’ + encodeURIComponent(’select * from html where url=”‘ + site + ‘”‘) + ‘&format=xml&callback=?’;

// Request that YSQL string, and run a callback function.

// Pass a defined function to prevent cache-busting.

$.getJSON( yql, cbFunc );

function cbFunc(data) {

// If we have something to work with…

if ( data.results[0] ) {

// Strip out all script tags, for security reasons.

// BE VERY CAREFUL. This helps, but we should do more.

data = data.results[0].replace(/<script[^>]*>[\s\S]*?<\/script>/gi, ”);

// If the user passed a callback, and it

// is a function, call it, and send through the data var.

if ( typeof callback === ‘function’) {

callback(data);

}

}

// Else, Maybe we requested a site that doesn’t exist, and nothing returned.

else throw new Error(’Nothing returned from getJSON.’);

}

}

</script>

<script type=”text/javascript”>

$(document).ready(function() {

var path = “http://navindutta.com/”;

requestCrossDomain(path, function(results) {

$(’#containerdiv1′).html(results);

});

return false;

});

</script>

ALTER DATABASE

ALTER TABLE

ALTER VIEW

ANALYZE TABLE

BACKUP TABLE

CACHE INDEX

CHANGE MASTER TO

CHECK TABLE

CHECKSUM TABLE

COMMIT

CREATE DATABASE

CREATE INDEX

CREATE TABLE

CREATE VIEW

DELETE

DESCRIBE

DO

DROP DATABASE

DROP INDEX

DROP TABLE

DROP USER

DROP VIEW

EXPLAIN

FLUSH

GRANT

HANDLER

INSERT

JOIN

KILL

LOAD DATA FROM MASTER

LOAD DATA INFILE

LOAD INDEX INTO CACHE

LOAD TABLE...FROM MASTER

LOCK TABLES

OPTIMIZE TABLE

PURGE MASTER LOGS

RENAME TABLE

REPAIR TABLE

REPLACE

RESET

RESET MASTER

RESET SLAVE

RESTORE TABLE

REVOKE

ROLLBACK

ROLLBACK TO SAVEPOINT

SAVEPOINT

SELECT

SET

SET PASSWORD

SET SQL_LOG_BIN

SET TRANSACTION

SHOW BINLOG EVENTS

SHOW CHARACTER SET

SHOW COLLATION

SHOW COLUMNS

SHOW CREATE DATABASE

SHOW CREATE TABLE

SHOW CREATE VIEW

SHOW DATABASES

SHOW ENGINES

SHOW ERRORS

SHOW GRANTS

SHOW INDEX

SHOW INNODB STATUS

SHOW LOGS

SHOW MASTER LOGS

SHOW MASTER STATUS

SHOW PRIVILEGES

SHOW PROCESSLIST

SHOW SLAVE HOSTS

SHOW SLAVE STATUS

SHOW STATUS

SHOW TABLE STATUS

SHOW TABLES

SHOW VARIABLES

SHOW WARNINGS

START SLAVE

START TRANSACTION

STOP SLAVE

TRUNCATE TABLE

UNION

UNLOCK TABLES

USE

String Functions

AES_DECRYPT

AES_ENCRYPT

ASCII

BIN

BINARY

BIT_LENGTH

CHAR

CHAR_LENGTH

CHARACTER_LENGTH

COMPRESS

CONCAT

CONCAT_WS

CONV

DECODE

DES_DECRYPT

DES_ENCRYPT

ELT

ENCODE

ENCRYPT

EXPORT_SET

FIELD

FIND_IN_SET

HEX

INET_ATON

INET_NTOA

INSERT

INSTR

LCASE

LEFT

LENGTH

LOAD_FILE

LOCATE

LOWER

LPAD

LTRIM

MAKE_SET

MATCH    AGAINST

MD5

MID

OCT

OCTET_LENGTH

OLD_PASSWORD

ORD

PASSWORD

POSITION

QUOTE

REPEAT

REPLACE

REVERSE

RIGHT

RPAD

RTRIM

SHA

SHA1

SOUNDEX

SPACE

STRCMP

SUBSTRING

SUBSTRING_INDEX

TRIM

UCASE

UNCOMPRESS

UNCOMPRESSED_LENGTH

UNHEX

UPPER

Date and Time Functions

ADDDATE

ADDTIME

CONVERT_TZ

CURDATE

CURRENT_DATE

CURRENT_TIME

CURRENT_TIMESTAMP

CURTIME

DATE

DATE_ADD

DATE_FORMAT

DATE_SUB

DATEDIFF

DAY

DAYNAME

DAYOFMONTH

DAYOFWEEK

DAYOFYEAR

EXTRACT

FROM_DAYS

FROM_UNIXTIME

GET_FORMAT

HOUR

LAST_DAY

LOCALTIME

LOCALTIMESTAMP

MAKEDATE

MAKETIME

MICROSECOND

MINUTE

MONTH

MONTHNAME

NOW

PERIOD_ADD

PERIOD_DIFF

QUARTER

SEC_TO_TIME

SECOND

STR_TO_DATE

SUBDATE

SUBTIME

SYSDATE

TIME

TIMEDIFF

TIMESTAMP

TIMESTAMPDIFF

TIMESTAMPADD

TIME_FORMAT

TIME_TO_SEC

TO_DAYS

UNIX_TIMESTAMP

UTC_DATE

UTC_TIME

UTC_TIMESTAMP

WEEK

WEEKDAY

WEEKOFYEAR

YEAR

YEARWEEK

Mathematical and Aggregate Functions

ABS

ACOS

ASIN

ATAN

ATAN2

AVG

BIT_AND

BIT_OR

BIT_XOR

CEIL

CEILING

COS

COT

COUNT

CRC32

DEGREES

EXP

FLOOR

FORMAT

GREATEST

GROUP_CONCAT

LEAST

LN

LOG

LOG2

LOG10

MAX

MIN

MOD

PI

POW

POWER

RADIANS

RAND

ROUND

SIGN

SIN

SQRT

STD

STDDEV

SUM

TAN

TRUNCATE

VARIANCE

Flow Control Functions

CASE

IF

IFNULL

NULLIF

Command-Line Utilities

comp_err

isamchk

make_binary_distribution

msql2mysql

my_print_defaults

myisamchk

myisamlog

myisampack

mysqlaccess

mysqladmin

mysqlbinlog

mysqlbug

mysqlcheck

mysqldump

mysqldumpslow

mysqlhotcopy

mysqlimport

mysqlshow

perror

Perl API – using functions and methods built into the Perl DBI with MySQL

available_drivers

begin_work

bind_col

bind_columns

bind_param

bind_param_array

bind_param_inout

can

clone

column_info

commit

connect

connect_cached

data_sources

disconnect

do

dump_results

err

errstr

execute

execute_array

execute_for_fetch

fetch

fetchall_arrayref

fetchall_hashref

fetchrow_array

fetchrow_arrayref

fetchrow_hashref

finish

foreign_key_info

func

get_info

installed_versions

last_insert_id

looks_like_number

neat

neat_list

parse_dsn

parse_trace_flag

parse_trace_flags

ping

prepare

prepare_cached

primary_key

primary_key_info

quote

quote_identifier

rollback

rows

selectall_arrayref

selectall_hashref

selectcol_arrayref

selectrow_array

selectrow_arrayref

selectrow_hashref

set_err

state

table_info

table_info_all

tables

trace

trace_msg

type_info

type_info_all

Attributes for Handles

PHP API – using functions built into PHP with MySQL

mysql_affected_rows

mysql_change_user

mysql_client_encoding

mysql_close

mysql_connect

mysql_create_db

mysql_data_seek

mysql_db_name

mysql_db_query

mysql_drop_db

mysql_errno

mysql_error

mysql_escape_string

mysql_fetch_array

mysql_fetch_assoc

mysql_fetch_field

mysql_fetch_lengths

mysql_fetch_object

mysql_fetch_row

mysql_field_flags

mysql_field_len

mysql_field_name

mysql_field_seek

mysql_field_table

mysql_field_type

mysql_free_result

mysql_get_client_info

mysql_get_host_info

mysql_get_proto_info

mysql_get_server_info

mysql_info

mysql_insert_id

mysql_list_dbs

mysql_list_fields

mysql_list_processes

mysql_list_tables

mysql_num_fields

mysql_num_rows

mysql_pconnect

mysql_ping

mysql_query

mysql_real_escape_string

mysql_result

mysql_select_db

mysql_stat

mysql_tablename

mysql_thread_id

mysql_unbuffered_query

Below when you see # it means from the unix shell. When you see mysql> it means from a MySQL prompt after logging into MySQL.

To login (from unix shell) use -h only if needed.

# [mysql dir]/bin/mysql -h hostname -u root -p

Create a database on the sql server.

mysql> create database [databasename];

List all databases on the sql server.

mysql> show databases;

Switch to a database.

mysql> use [db name];

To see all the tables in the db.

mysql> show tables;

To see database’s field formats.

mysql> describe [table name];

To delete a db.

mysql> drop database [database name];

To delete a table.

mysql> drop table [table name];

Show all data in a table.

mysql> SELECT * FROM [table name];

Returns the columns and column information pertaining to the designated table.

mysql> show columns from [table name];

Show certain selected rows with the value “whatever”.

mysql> SELECT * FROM [table name] WHERE [field name] = “whatever”;

Show all records containing the name “Bob” AND the phone number ‘3444444′.

mysql> SELECT * FROM [table name] WHERE name = “Bob” AND phone_number = ‘3444444′;

Show all records not containing the name “Bob” AND the phone number ‘3444444′ order by the phone_number field.

mysql> SELECT * FROM [table name] WHERE name != “Bob” AND phone_number = ‘3444444′ order by phone_number;

Show all records starting with the letters ‘bob’ AND the phone number ‘3444444′.

mysql> SELECT * FROM [table name] WHERE name like “Bob%” AND phone_number = ‘3444444′;

Show all records starting with the letters ‘bob’ AND the phone number ‘3444444′ limit to records 1 through 5.

mysql> SELECT * FROM [table name] WHERE name like “Bob%” AND phone_number = ‘3444444′ limit 1,5;

Use a regular expression to find records. Use “REGEXP BINARY” to force case-sensitivity. This finds any record beginning with a.

mysql> SELECT * FROM [table name] WHERE rec RLIKE “^a”;

Show unique records.

mysql> SELECT DISTINCT [column name] FROM [table name];

Show selected records sorted in an ascending (asc) or descending (desc).

mysql> SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;

Return number of rows.

mysql> SELECT COUNT(*) FROM [table name];

Sum column.

mysql> SELECT SUM(*) FROM [table name];

Join tables on common columns.

mysql> select lookup.illustrationid, lookup.personid,person.birthday from lookup left join person on lookup.personid=person.personid=statement to join birthday in person table with primary illustration id;

Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> INSERT INTO user (Host,User,Password) VALUES(’%',’username’,PASSWORD(’password’));
mysql> flush privileges;

Change a users password from unix shell.

# [mysql dir]/bin/mysqladmin -u username -h hostname.blah.org -p password ‘new-password’

Change a users password from MySQL prompt. Login as root. Set the password. Update privs.

# mysql -u root -p
mysql> SET PASSWORD FOR ‘user’@'hostname’ = PASSWORD(’passwordhere’);
mysql> flush privileges;

Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.

# /etc/init.d/mysql stop
# mysqld_safe –skip-grant-tables &
# mysql -u root
mysql> use mysql;
mysql> update user set password=PASSWORD(”newrootpassword”) where User=’root’;
mysql> flush privileges;
mysql> quit
# /etc/init.d/mysql stop
# /etc/init.d/mysql start

Set a root password if there is on root password.

# mysqladmin -u root password newpassword

Update a root password.

# mysqladmin -u root -p oldpassword newpassword

Allow the user “bob” to connect to the server from localhost using the password “passwd”. Login as root. Switch to the MySQL db. Give privs. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> grant usage on *.* to bob@localhost identified by ‘passwd’;
mysql> flush privileges;

Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.

# mysql -u root -p
mysql> use mysql;
mysql> INSERT INTO db (Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv) VALUES (’%',’databasename’,'username’,'Y’,'Y’,'Y’,'Y’,'Y’,'N’);
mysql> flush privileges;

or

mysql> grant all privileges on databasename.* to username@localhost;
mysql> flush privileges;

To update info already in a table.

mysql> UPDATE [table name] SET Select_priv = ‘Y’,Insert_priv = ‘Y’,Update_priv = ‘Y’ where [field name] = ‘user’;

Delete a row(s) from a table.

mysql> DELETE from [table name] where [field name] = ‘whatever’;

Update database permissions/privilages.

mysql> flush privileges;

Delete a column.

mysql> alter table [table name] drop column [column name];

Add a new column to db.

mysql> alter table [table name] add column [new column name] varchar (20);

Change column name.

mysql> alter table [table name] change [old column name] [new column name] varchar (50);

Make a unique column so you get no dupes.

mysql> alter table [table name] add unique ([column name]);

Make a column bigger.

mysql> alter table [table name] modify [column name] VARCHAR(3);

Delete unique from table.

mysql> alter table [table name] drop index [colmn name];

Load a CSV file into a table.

mysql> LOAD DATA INFILE ‘/tmp/filename.csv’ replace INTO TABLE [table name] FIELDS TERMINATED BY ‘,’ LINES TERMINATED BY ‘\n’ (field1,field2,field3);

Dump all databases for backup. Backup file is sql commands to recreate all db’s.

# [mysql dir]/bin/mysqldump -u root -ppassword –opt >/tmp/alldatabases.sql

Dump one database for backup.

# [mysql dir]/bin/mysqldump -u username -ppassword –databases databasename >/tmp/databasename.sql

Dump a table from a database.

# [mysql dir]/bin/mysqldump -c -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql

Restore database (or database table) from backup.

# [mysql dir]/bin/mysql -u username -ppassword databasename < /tmp/databasename.sql

Create Table Example 1.

mysql> CREATE TABLE [table name] (firstname VARCHAR(20), middleinitial VARCHAR(3), lastname VARCHAR(35),suffix VARCHAR(3),officeid VARCHAR(10),userid VARCHAR(15),username VARCHAR(8),email VARCHAR(35),phone VARCHAR(25), groups VARCHAR(15),datestamp DATE,timestamp time,pgpemail VARCHAR(255));

Create Table Example 2.

mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default ‘bato’);

Most of our development work is done on Moodle. So we chose Moodle repository to clone and play with.

To install git on our linux servers

#yum install git-core gitk

To Create a git repository create the folders

#mkdir /git
#cd /git/
#mkdir moodle.git
#cd moodle.git/


Lets Initialize a blank repository

#git init --bare --shared=group

Fetch Moodle versions – The same command be run in cron to update at an hourly basis

#git --bare fetch git://git.moodle.org/moodle.git cvshead:cvshead#git --bare fetch git://git.moodle.org/moodle.git MOODLE_19_STABLE:MOODLE_19_STABLE

Make a working copy


#cd /var/www/html/
#git clone file:///git/moodle.git moodlegit
Initialized empty Git repository in /var/www/html/moodlegit/.git/
remote: Counting objects: 354671, done.
remote: Compressing objects: 100% (89253/89253), done.
remote: Total 354671 (delta 261661), reused 352647 (delta 259667)
Receiving objects: 100% (354671/354671), 144.86 MiB | 8.50 MiB/s, done.
Resolving deltas: 100% (261661/261661), done.
warning: remote HEAD refers to nonexistent ref, unable to checkout.

I got an error and check out fails — Warning: Remote HEAD refers to nonexistent ref, unable to checkout. Which means it tries to setup a tracking branch that is not there in your local repository.


#cd moodle19git/#git branch -r ---- When i used this command it showed me two hidden directories for cvshead and MOODLE_19_STABLE

You can do away with this warning by issuing command #git branch master which in this case will be the command below. This will switch it to the master branch.


#git branch cvshead


Now I checked out the two branches


#git checkout -b MOODLE_19_STABLE origin/MOODLE_19_STABLE#git checkout -b cvshead origin/cvshead

Next I created a new branch for edvanta for customizing moodle 1.9+ for a project


#git checkout -b mdl19-edvanta origin/MOODLE_19_STABLE


Now we can any changes on this. and then push it back to the server so that other developers can use it.


#git push origin mdl19-edvanta:mdl19-edvanta


Now others can take my code and work with it on their system locally like this


#git clone file:///git/moodle.git moodlegit
#cd moodlegit
#git checkout -b mdl19-edvanta origin/md19-edvanta


Once they have made their changes they can chose to publish their work to the main repository.


#git add
#git commit -a -m "Changes made by the third party developer"
#git push origin/mdl19-edvanta mdl19-edvanta


To export to moodle2 directory without .git folders

#git checkout-index -a -f --prefix=/var/www/html/moodle2/


#yum list | grep "postgres*"

#yum install -y "postgres*"

To initialize the postgresql

#service postgresql initdb

To start the postgresql service

#service postgresql start

Editing config files and creating new databases using pgadmin3 gui

#yum install -y pgadmin3

pgadmin gets install in /usr/bin/pgadmin3

To run pgadmin3

#pgadmin3

Add server, choose any name, host = localhost, user= postgres, password = ” For others choose default settings and click okay.

Now create a new database
Database name: new_database
user: postgres
pass: ”

click okay and your good to go.

editing config files and creating databases using a terminal

Edit pg_hba.conf in /var/lib/pgsql/data and change the

#vim /var/lib/pgsql/data/pg_hba.conf

This setting

ipv4 local all all ident sameuser

to this

ipv4 local all all trust sameuser

To change other settings you can edit postgresql.conf

#vim /var/lib/pgsql/data/postgresql.conf