Wednesday, June 1, 2011

How To Install PhpMyAdmin On CentOS

CentOS 5.5 version :

1. import key :

rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt

2. install rpm :

cd /tmp
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.1-1.el5.rf.i386.rpm ( https://rpmrepo.org/RPMforge/Using )
rpm -ivh rpmforge-release-0.5.1-1.el5.rf.i386.rpm

3. install phpmyadmin using yum :

yum install phpmyadmin

4. config phpmyadmin :

4.1 Now we configure phpMyAdmin. We change the Apache configuration so that phpMyAdmin allows connections not just from localhost (by commenting out the stanza):

vi /etc/httpd/conf.d/phpmyadmin.conf


# Web application to manage MySQL
#
#
# Order Deny,Allow
# Deny from all
# Allow from 127.0.0.1
#
Alias /phpmyadmin /usr/share/phpmyadmin
Alias /phpMyAdmin /usr/share/phpmyadmin
Alias /mysqladmin /usr/share/phpmyadmin

4.2 Next we change the authentication in phpMyAdmin from cookie to http:

vi /usr/share/phpmyadmin/config.inc.php

[...]
/* Authentication type */
$cfg['Servers'][$i]['auth_type'] = 'http';
[...]

5. restart apache

========================================================================================================================

Additional case :

1. Error : The configuration file now needs a secret passphrase (blowfish_secret)

To fix:

nano /usr/share/phpmyadmin/conf.inc.php

Look for a line and enter any password. Just dont leave it empty!

$cfg['blowfish_secret'] = 'mydemopass'; /* YOU MUST FILL IN THIS FOR COOKIE AUTH! */

ClamAV Error On CPanel

Solution :

1. Install cpanel pro dahulu
2. baru install clamav
3. http://forums.cpanel.net/f5/cron-root-usr-bin-freshclam-quiet-no-warnings-117753.html#post681037

I went into ssh and did the following:

cd /usr/local/cpanel/modules-install/

ls -al|grep clam

cd clamavconnector-Linux-x86_64 #(your's may be different)

sh install

ls -al /usr/bin/freshclam

When I ran the installer from command line, I noticed it took quite a bit longer to run then it did in whm, and everything was installed correctly.

It's a bit early, so I've not investigated any further, but my hunch is that is has something to do with the path difference in shell over whm.

Hope this helps someone else too.

LINUX Security :

1. http://www.linux.org/docs/ldp/howto/Postfix-Cyrus-Web-cyradm-HOWTO/installing-anti-spam.html

2. http://geobaby.in

3. http://mysql-apache-php.com/basic-linux-security.htm

How To Configure DELL iDRAG - iLO

Reboot
Press f10
Go to hardware configuration > Configuration wizard > iDRAC configuration >

1. Use default : enabled,disabled,shared
2. Next
3. Fill the ip configuration
4. Next
5. Next
6. Set password
7. Summary, just apply
8. Finish

Back to Main
Exit and restart

Cannot Umount /tmp : Drive Is Busy

umount: /tmp: device is busy + Resolved

Guys,

Just check who is accessing the device. Here are the commands to check who are using it.

=======
lsof |grep /tmp
=======

You'll get the process ID and kill the processes like kill -9 PID. Here is an example(Second column is PID) :

=======
root@server [~]# lsof |grep /tmp
mysqld 2579 mysql 4u REG 7,0 0 6098 /tmp/ibZGlGm2 (deleted)
mysqld 2579 mysql 5u REG 7,0 68 6100 /tmp/ibgWnlrp (deleted)
mysqld 2579 mysql 6u REG 7,0 0 6101 /tmp/ib7XB0vM (deleted)
mysqld 2579 mysql 7u REG 7,0 0 6102 /tmp/ibQx1jB9 (deleted)
mysqld 2579 mysql 11u REG 7,0 0 6103 /tmp/ibBSaB7w (deleted)
=======

Then retry to umount the device like : umount /tmp_device_name //You'll get device from /etc/fstab. This file contains the mounting file system table information after system reboot and /etc/mtab holds the current mounted table information.

=======
fuser -m /dev/sda3 //You can also get the PID from here also. But note that deleting all the PID related to this device may cause the problem on the system and you may need to restart the machine.
=======

That's it. Try :)

How To Clear /tmp For Over Period Of Time

You may need to use a command called tmpwatch which removes files which haven’t been accessed for a period of time. Normally, it’s used to clean up directories which are used for temporary holding space such as /tmp.

Following code will remove all files/dirs from /tmp if they are not accessed in last 2 weeks (24 * 14 days = 336)

Code:
tmpwatch --mtime --all 336 /tmp

You can also add this command to the crontab.

Common SSH Commands - Linux Shell Commands

Common SSH Commands - Linux Shell Commands :

ls : list files/directories in a directory, comparable to dir in windows/dos.
ls -al : shows all files (including ones that start with a period), directories, and details attributes for each file.

cd : change directory · · cd /usr/local/apache : go to /usr/local/apache/ directory
cd ~ : go to your home directory
cd - : go to the last directory you were in
cd .. : go up a directory cat : print file contents to the screen

cat filename.txt : cat the contents of filename.txt to your screen

chmod: changes file access permissions
The set of 3 go in this order from left to right:
USER - GROUP - EVERONE

0 = --- No permission
1 = --X Execute only
2 = -W- Write only
3 = -WX Write and execute
4 = R-- Read only
5 = R-X Read and execute
6 = RW- Read and write
7 = RWX Read, write and execute

Usage:
chmod numberpermissions filename

chmod 000 : No one can access
chmod 644: Usually for HTML pages
chmod 755: Usually for CGI scripts


chown: changes file ownership permissions
The set of 2 go in this order from left to right:
USER - GROUP

chown root myfile.txt : Changes the owner of the file to root
chown root.root myfile.txt : Changes the owner and group of the file to root


tail : like cat, but only reads the end of the file
tail /var/log/messages : see the last 20 (by default) lines of /var/log/messages
tail -f /var/log/messages : watch the file continuously, while it's being updated
tail -200 /var/log/messages : print the last 200 lines of the file to the screen

more : like cat, but opens the file one screen at a time rather than all at once
more /etc/userdomains : browse through the userdomains file. hit Spaceto go to the next page, q to quit

pico : friendly, easy to use file editor
pico /home/burst/public_html/index.html : edit the index page for the user's website.


File Editing with VI ssh commands
vi : another editor, tons of features, harder to use at first than pico
vi /home/burst/public_html/index.html : edit the index page for the user's website.
Whie in the vi program you can use the following useful commands, you will need to hit SHIFT + : to go into command mode

:q! : This force quits the file without saving and exits vi
:w : This writes the file to disk, saves it
:wq : This saves the file to disk and exists vi
:LINENUMBER : EG :25 : Takes you to line 25 within the file
:$ : Takes you to the last line of the file
:0 : Takes you to the first line of the file

grep : looks for patterns in files
grep root /etc/passwd : shows all matches of root in /etc/passwd
grep -v root /etc/passwd : shows all lines that do not match root

ln : create's "links" between files and directories
ln -s /usr/local/apache/conf/httpd.conf /etc/httpd.conf : Now you can edit /etc/httpd.conf rather than the original. changes will affect the orginal, however you can delete the link and it will not delete the original.


last : shows who logged in and when
last -20 : shows only the last 20 logins
last -20 -a : shows last 20 logins, with the hostname in the last field

w : shows who is currently logged in and where they are logged in from.
who : This also shows who is on the server in an shell.

netstat : shows all current network connections.
netstat -an : shows all connections to the server, the source and destination ips and ports.
netstat -rn : shows routing table for all ips bound to the server.

top : shows live system processes in a nice table, memory information, uptime and other useful info. This is excellent for managing your system processes, resources and ensure everything is working fine and your server isn't bogged down.
top then type Shift + M to sort by memory usage or Shift + P to sort by CPU usage

ps: ps is short for process status, which is similar to the top command. It's used to show currently running processes and their PID.
A process ID is a unique number that identifies a process, with that you can kill or terminate a running program on your server (see kill command).
ps U username : shows processes for a certain user
ps aux : shows all system processes
ps aux --forest : shows all system processes like the above but organizes in a hierarchy that's very useful!

touch : create an empty file
touch /home/burst/public_html/404.html : create an empty file called 404.html in the directory /home/burst/public_html/

file : attempts to guess what type of file a file is by looking at it's content.
file * : prints out a list of all files/directories in a directory

du : shows disk usage.
du -sh : shows a summary, in human-readble form, of total disk space used in the current directory, including subdirectories.
du -sh * : same thing, but for each file and directory. helpful when finding large files taking up space.

wc : word count
wc -l filename.txt : tells how many lines are in filename.txt

cp : copy a file
cp filename filename.backup : copies filename to filename.backup
cp -a /home/burst/new_design/* /home/burst/public_html/ : copies all files, retaining permissions form one directory to another.
cp -av * ../newdir : Copies all files and directories recurrsively in the current directory INTO newdir

mv : Move a file command
mv oldfilename newfilename : Move a file or directory from oldfilename to newfilename

rm : delete a file
rm filename.txt : deletes filename.txt, will more than likely ask if you really want to delete it
rm -f filename.txt : deletes filename.txt, will not ask for confirmation before deleting.
rm -rf tmp/ : recursively deletes the directory tmp, and all files in it, including subdirectories. BE VERY CAREFULL WITH THIS COMMAND!!!

TAR: Creating and Extracting .tar.gz and .tar files
tar -zxvf file.tar.gz : Extracts the file
tar -xvf file.tar : Extracts the file
tar -cf archive.tar contents/ : Takes everything from contents/ and puts it into archive.tar
gzip -d filename.gz : Decompress the file, extract it

ZIP Files: Extracting .zip files shell command
unzip file.zip


Firewall - iptables commands
iptables -I INPUT -s IPADDRESSHERE -j DROP : This command stops any connections from the IP address
iptables -L : List all rules in iptables
iptables -F : Flushes all iptables rules (clears the firewall)
iptables --save : Saves the currenty ruleset in memory to disk
service iptables restart : Restarts iptables

Apache Shell Commands
httpd -v : Outputs the build date and version of the Apache server.
httpd -l : Lists compiled in Apache modules
httpd status : Only works if mod_status is enabled and shows a page of active connections
service httpd restart : Restarted Apache web server

MySQL Shell Commands
mysqladmin processlist : Shows active mysql connections and queries
mysqladmin drop databasenamehere : Drops/deletes the selected database
mysqladmin create databasenamehere : Creates a mysql database

Restore MySQL Database Shell Command
mysql -u username -p password databasename < databasefile.sql : Restores a MySQL database from databasefile.sql

Backup MySQL Database Shell Command
mysqldump -u username -p password databasename > databasefile.sql : Backup MySQL database to databasefile.sql




kill: terminate a system process
kill -9 PID EG: kill -9 431
kill PID EG: kill 10550
Use top or ps ux to get system PIDs (Process IDs)

EG:
PID TTY TIME COMMAND
10550 pts/3 0:01 /bin/csh
10574 pts/4 0:02 /bin/csh
10590 pts/4 0:09 APP
Each line represents one process, with a process being loosely defined as a running instance of a program. The column headed PID (process ID) shows the assigned process numbers of the processes. The heading COMMAND shows the location of the executed process.

Putting commands together
Often you will find you need to use different commands on the same line. Here are some examples. Note that the | character is called a pipe, it takes date from one program and pipes it to another.
> means create a new file, overwriting any content already there.
>> means tp append data to a file, creating a newone if it doesn not already exist.
< send input from a file back into a command.

grep User /usr/local/apache/conf/httpd.conf |more
This will dump all lines that match User from the httpd.conf, then print the results to your screen one page at a time.

last -a > /root/lastlogins.tmp
This will print all the current login history to a file called lastlogins.tmp in /root/

tail -10000 /var/log/exim_mainlog |grep domain.com |more
This will grab the last 10,000 lines from /var/log/exim_mainlog, find all occurances of domain.com (the period represents 'anything',
-- comment it out with a so it will be interpretted literally), then send it to your screen page by page.

netstat -an |grep :80 |wc -l
Show how many active connections there are to apache (httpd runs on port 80)

mysqladmin processlist |wc -l
Show how many current open connections there are to mysql

Load Monitoring Script For Linux #1

#!/bin/bash
#
# Script to notify admin user if Linux,FreeBSD load crossed certain limit
# It will send an email notification to admin.
#
# Copyright 2005 (c) nixCraft project
# This is free script under GNU GPL version 2.0 or above.
# Support/FeedBack/comment : http://cyberciti.biz/fb/
# Tested os:
# * RedHat Linux
# * Debain Linux
# * FreeBSD
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------

# Set up limit below
NOTIFY="4.0"

# admin user email id
EMAIL="yourmail@mail.com"

# Subject for email
SUBJECT="Alert $(hostname) Load Average Exceeded The Limit"

# -----------------------------------------------------------------

# Os Specifc tweaks do not change anything below ;)
OS="$(uname)"
TRUE="1"
if [ "$OS" == "FreeBSD" ]; then
TEMPFILE="$(mktemp /tmp/$(basename $0).tmp.XXX)"
FTEXT='load averages:'
elif [ "$OS" == "Linux" ]; then
TEMPFILE="$(mktemp)"
FTEXT='load average:'
fi

# get first 5 min load
F5M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f1)"
# 10 min
F10M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f2)"
# 15 min
F15M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3)"

#Save the current running processes in a file
/bin/ps -auxf >> /root/ps_output

# mail message
# keep it short coz we may send it to page or as an short message (SMS)
echo "Load average Crossed allowed limit $NOTIFY." >> $TEMPFILE
echo "Hostname: $(hostname)" >> $TEMPFILE
echo "Local Date & Time : $(date)" >> $TEMPFILE
echo "Load Average :" >> $TEMPFILE
echo -e "\n" >> $TEMPFILE
echo "$(top -n 1 -b|head -20)" >> $TEMPFILE

# Look if it crossed limit
# compare it with last 15 min load average
RESULT=$(echo "$F15M > $NOTIFY" | bc)

# if so send an email
if [ "$RESULT" == "$TRUE" ]; then
mail -s "$SUBJECT" "$EMAIL" < $TEMPFILE
fi

# remove file
rm -f $TEMPFILE

Cpanel Logs

Log file is a file which stores all the information of all files that are accessed and they also have errors which help a system administrator to troubleshoot issues and fixing them. Few log file locations can be found below:

Apache web server :
/usr/local/apache/logs/access_log
/usr/local/apache/logs/error_log
/usr/local/apache/domlogs/domain.com

MySQL database server :
/var/lib/mysql/server.hostname.com.err

Exim mail server :
/var/log/exim_mainlog
/var/log/exim_paniclog
/var/log/exim_rejectlog

Courier-IMAP :
/var/log/maillog

cPanel control panel :
/usr/local/cpanel/logs/error_log
/usr/local/cpanel/logs/access_log
/usr/local/cpanel/logs/license_log
/usr/local/cpanel/logs/login_log
path: /usr/local/cpanel/logs/stats_log

FTP server :
/var/log/messages
/var/log/xferlog

System logs :
/var/log/messages
/var/log/boot.log
/var/log/cron
/var/log/dmesg

Security logs :
/var/log/secure
/var/log/messagesd