If you are facing any issue while installing the LAMP, you can refer the below URL
http://www.howtoforge.com/ubuntu_lamp_for_newbies
cd /var/www/
wget http://rapidleech.googlecode.com/files/rapidleech-svn322.zip
unzip rapidleech-svn322.zip
mv r322 leech
cd leech
chmod 777 -R files/ configs/
Run a browser and access the address leech, http://localhost/leech .
On the web Rapidleech content Link to Tranload dialog box with a link that will be downloaded as hotfile or rapidshare, and then click the link to transload;
There can be different reasons why one wants to repair a MySQL database. Database corruption maybe due to a lack of disk space or an unexpected server shutdown that caused the database to go bad. Queries that worked before suddenly stopped working and overall the database is not behaving anymore as expected. This guide shall not be a full database troubleshooting guide, but rather give you a hand on doing a MySQL repair on all databases on a cPanel/WHM server (or any other server running MySQL).
The situation: Your server crashed hard and when it is back up the MySQL side of the house is not working anymore. You do your normal troubleshooting. If all other troubleshooting and verifications are done, you come to the conclusion that you will need to run a repair as the next step. A full database restore from a (hopefully existing) good database backup would be your last choice.
Repairing one MySQL database is fairly easy, but how do you do this for an entire server holding20, 30, 50 or over 100 databases? You will need SSH access as the root user to the server running MySQL. So, log in as the root user and then do the following to repair your MySQL databases:
Please be advised that you should backup critical databases before running any of the commands below:
Option #1
Check if you any need DB repair:
#myisamchk –check /var/lib/mysql/*/*.MYI
Then try a ‘safe-recover’ as the first step:
#myisamchk –safe-recover /var/lib/mysql/*/*.MYI
If the ‘safe-recover’ does not work, run a full recover:
#myisamchk –recover /var/lib/mysql/*/*.MYI
Then use the ‘force’ flag to get things back to normal:
#myisamchk –safe-recover –extend-check –force /var/lib/mysql/*/*.MYI
or
Use the mysqlcheck tool to repair your databases.
#mysqlcheck -–all-databases -r #repair
#mysqlcheck -–all-databases -a #analyze
#mysqlcheck -–all-databases -o #optimize
There you have it. By using one of these two options you should be able to repair and recover your databases. Please be advised that you should backup critical databases before running any of the commands above. If something goes wrong you can revert back and try again.
Chkrootkit is a tool to locally check for signs of a rootkit. It contains a chkrootkit: shell script that checks system binaries for rootkit modification.
Installation:– Login to your server as root. (SSH)
cd /usr/local/src
– Down load the chkrootkit.# wget ftp://ftp.pangeia.com.br/pub/seg/pac/chkrootkit.tar.gz
- Unpack the chkrootkit you just downloaded.# tar -xvzf chkrootkit.tar.gz
- Change to new directory# cd chkrootkit*
- Compile chkrootkit# make sense
- Run chkrootkit# ./chkrootkit
How to setup a daily scan report?
- Load crontab# crontab -e
- Add this line to the top:==========================================================================
0 1 * * * (cd /path/to/chkrootkit; ./chkrootkit 2>&1 | mail -s “chkrootkit output” email@domain.com)
==========================================================================
This will run CHKROOTKIT at 1am every day, and e-mail the output to root. (you need change the time whenever you want it to run and the email id according to your needs.)
Nginx (engine x) is an HTTP(S) server, reverse proxy and IMAP/POP3 proxy server written by Igor Sysoev. It is known for its high performance, stability, rich feature set, simple configuration, and low resource consumption.
This manual is useful for those wishing to install Nginx web server in Cpanel to manage static content using less cpu and ram, so we just loaded PHP to Apache.
tested on ( Cpanel 11.28, CentOS 5 x86_64, PHP 5.2.16 and Apache 2.2 )
Installation:
————————————————————————————————————–
cd /usr/src
wget http://sysoev.ru/nginx/nginx-0.7.63.tar.gz
wget http://stderr.net/apache/rpaf/download/mod_rpaf-0.6.tar.gz
wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-7.9.tar.gz
tar xvzf mod_rpaf-0.6.tar.gz
cd mod_rpaf-0.6
/usr/local/apache/bin/apxs -i -c -n mod_rpaf-2.0.so mod_rpaf-2.0.c
cd /usr/src
tar xvzf pcre-7.9.tar.gz
cd pcre-7.9
./configure
make
make install
cd /usr/src
tar xvzf nginx-0.7.63.tar.gz
cd nginx-0.7.63
./configure –with-http_ssl_module –with-http_realip_module –with-http_dav_module –with-http_flv_module –with-http_gzip_static_module
make
make install
==================================================
-Login to WHM and look for the following route:
Main >> Service Configuration >> Apache Setup > Include Editor > Pre Main Include
- Add the following configuration and save, LIST_OF_YOUR_IPS changing the IP you occupy in your site:
——————————————————————–
LoadModule rpaf_module modules/mod_rpaf-2.0.so
RPAFenable On
# Enable reverse proxy add forward
RPAFproxy_ips 127.0.0.1 LIST_OF_YOUR_IPS
# which ips are forwarding requests to us
RPAFsethostname On
# let rpaf update vhost settings
# allows to have the same hostnames as in the “real”
# configuration for the forwarding Apache
RPAFheader X-Real-IP
# Allows you to change which header mod_rpaf looks
# for when trying to find the ip the that is forwarding
# our requests
——————————————————————–
Change the apache port to 81 (tweak settings)
Open whm – tweak settings and find 0.0.0.0:80 and change it to 0.0.0.0.:81
Run SSH console
# /usr/local/cpanel/whostmgr/bin/whostmgr2 –updatetweaksettings
# /scripts/rebuildhttpdconf
# service httpd restart
wget the automated nginx virtual host creator
wget http://www.hikaro.com/files/nginx.sh
- chmod the file and run it
# chmod 755 nginx.sh
# ./nginx.sh
Here you will get error then follows this steps
Edit nginx.sh
Find & replace the line /usr/local/nginx/conf/nginx.conf <
to /usr/local/nginx/conf/nginx.conf <
Again run the script
# ./nginx.sh
-Now check the configuration
# /usr/local/nginx/sbin/nginx -t
Start nginx
# /usr/local/nginx/sbin/nginx
Until now only the managing nginx connections, but is not serving static content. For the latter you must edit the following file:
/usr/local/nginx/conf/vhost.conf
-Remove the 3 # signs of the following lines, so the final configuration will looks like
————————————————————————————-
location ~* \.(gif|jpg|jpeg|png|wmv|avi|mpg|mpeg|mp4|js|css)$ {
root /home/myweb/public_html;
}
————————————————————————————–
–Restart nginx in SSH
/usr/local/nginx/sbin/nginx -s reload
Advanced Policy Firewall (APF) is an iptables(netfilter) based firewall system designed around the essential needs of today’s Linux servers. The configuration is designed to be very informative and easy to follow. The management on a day-to-day basis is conducted from the command line with the ‘apf’ command, which includes detailed usage information on all the features.
Requirements:
- Root SSH access to your server
Install
Login to your server through SSH and su to the root user.
cd /root/downloads or another temporary folder where you store your files.
Configure the firewall: (i mostly use nano editor) nano /etc/apf/conf.apf
General configuration to get your firewall running. This isn't a complete detailed guide of every feature the firewall has. Look through the README and the configuration for an explanation of each feature.
You may like to use DShield.org's "block" list of top networks that have exhibited suspicious activity.
FIND: USE_DS="0"
CHANGE TO: USE_DS="1"
Configuring Firewall Ports:
Cpanel Servers
recommended settings for Cpanel Servers
Common ingress (inbound) ports
# Common ingress (inbound) TCP ports -3000_3500 = passive port range for Pure FTPD
IG_TCP_CPORTS="21,22,25,53,80,110,143,443,2082,2083, 2086,2087, 2095, 2096,3000_3500"
#
# Common ingress (inbound) UDP ports
IG_UDP_CPORTS="53"
Common egress (outbound) ports
# Common egress (outbound) TCP ports
EG_TCP_CPORTS="21,25,80,443,43,2089"
#
# Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,53"
Ensim Servers
recommended settings for Ensim Servers
Common ingress (inbound) ports
# Common ingress (inbound) TCP ports
IG_TCP_CPORTS="21,22,25,53,80,110,143,443,19638"
#
# Common ingress (inbound) UDP ports
IG_UDP_CPORTS="53"
Common egress (outbound) ports
# Common egress (outbound) TCP ports
EG_TCP_CPORTS="21,25,80,443,43"
#
# Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,53"
Plesk Servers
recommended settings for Plesk Servers
# Common ingress (inbound) TCP ports
IG_TCP_CPORTS="20,21,22,25,53,80,110,143,443,465,993,995,3306,4643,5224,8443,8447,10000,
35000_35999"
# Common ingress (inbound) UDP ports
IG_UDP_CPORTS="20,21,53,1040"
# Common ICMP (inbound) types
# 'internals/icmp.types' for type definition; 'all' is wildcard for any
IG_ICMP_TYPES="3,5,11,0,30,8"
# Egress filtering [0 = Disabled / 1 = Enabled]
EGF="0"
# Common egress (outbound) TCP ports
EG_TCP_CPORTS="20,21,22,25,53,80,110,143,443,465,993,995,3306,5224,8443,10000,35000_35999"
# Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,37,53,123,1040"
# Common ICMP egress (outbound) types
# 'internals/icmp.types' for type definition; 'all' is wildcard for any
EG_ICMP_TYPES="all"
Save your changes! Ctrl + X then y (nano editor)
Starting the firewall
apf -s
Other commands:
usage /usr/local/sbin/apf [OPTION]
-s|--start ............. load firewall policies
-r|--restart ........... flush & load firewall
-f|--flush|--stop ...... flush firewall
-l|--list .............. list chain rules
-st|--status ........... firewall status
-a HOST|--allow HOST ... add host (IP/FQDN) to allow_hosts.rules and
immediately load new rule into firewall
-d HOST|--deny HOST .... add host (IP/FQDN) to deny_hosts.rules and
immediately load new rule into firewall
After everything is fine, change the DEV option
nano /etc/apf/conf.apf
# Set firewall cronjob (devel mode)
# 1 = enabled / 0 = disabled
DEVEL_MODE="0"
It is recommended changing this back to "0" after you've had a chance to ensure everything is working well and tested the server out.
Save your changes! Ctrl + X then y
Restart the firewall: apf -r
Make APF Start automatically at boot time
To autostart apf on reboot, run this:
chkconfig --level 2345 apf on
To remove it from autostart, run this:
chkconfig --del apf
If the server load is high then do the following tricks:
1) top or top -n1
check for the server load and watch for process
2) free -m
it will display the memory status
# vmstat : (virtual memory status)
# mymem : (which services are consuming memory)
3)if a perticular user is causing a high server laod then use “ps U username”: it will display the process that are running by the user . Then you can take action against that user.
4) netstat -an |grep :80 |wc -l :
Show how many active connections there are to apache (httpd runs on port 80)
5) netstat -ntu | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort –n
it will display the no of connections form a certain ip
6)if there is MYSQL taking cpu usage then check for mysql status
# watch mysqladmin proc
# mysqladmin -u root processlist
check for the databases and suspend that user if any database is using high resources.
7)check /tmp if there is any process taking high resources : chown to root for that process and chmod 000 also if .sh process is running then chown it t0 root:root
8)if exim is taking high resources then check for exim logs : use this command :
replace :blackhole: : fail: — /etc/valiases/*
w : Current users
exim -bp | exiqsumm
ps aux | head -1;ps aux –no-headers| sort -rn +3 | head :
Use below mentioned command to get top memory consuming processes
ps aux | head -1;ps aux –no-headers | sort -rn +2
ps aux | head -1;ps aux –no-headers | sort -rn +2
———————————————————————————————————-
If Exim causes
exim –bpc
shows the total no of email in qmail
eximstats -nr -ne /var/log/exim_mainlog
Total mail server report
pidof exim
shows no of exim pids running
exim -bpr | grep frozen | wc -l
Shows no of frozen emails
exiqgrep -z -i | xargs exim –Mrm
exim -bp | exiqgrep -i | xargs exim -Mrm
it deletes the FROZEN mails from the server
tail -f /var/log/exim_mainlog | grep public_html
check for spamming if anybody is using php script for sending mail through public_html
tail -f /var/log/exim_mainlog | grep /tmp
Used for checking for who is spamming through the /tmp
tail -3000 /var/log/exim_mainlog |grep ‘rejected RCPT’ |awk ‘{print$4}’|awk -F\[ '{print $2} '|awk -F\] ‘{print $1} ‘|sort | uniq -c | sort -k 1 -nr | head -n 5
It will display the IP and no of tries done by the IP to send mail but rejected by the server.
netstat -plan|grep :25|awk {‘print $5′}|cut -d: -f 1|sort|uniq -c|sort -nk 1
shows the connections from a certain ip to the SMTP server
exim -bp | exiqsumm | more
It shows the domain name and the no of emails sent by that domain
If spamming from outside domain then you can block that domain or email id on the server
pico /etc/antivirus.exim
Add the following lines:
if $header_from: contains “name@domain.com”
then
seen finish
endif
eximstats -nr -ne /var/log/exim_mainlog
Catching spammer
exim -bp | exiqsumm | more
exim -bpr | grep “<*@*>” | awk ‘{print $4}’|grep -v “<>” | sort | uniq -c | sort -n
That will show you the maximum no of email currently in the mail queue have from or to the email address in the mail queue with exact figure.
exim -bpr | grep “<*@*>” | awk ‘{print $4}’|grep -v “<>” |awk -F “@” ‘{ print $2}’ | sort | uniq -c | sort -n
That will show you the maximum no of email currently in the mail queue have for the domain or from the domain with number.
Check if any php script is causing the mass mailing with
cd /var/spool/exim/input
egrep “X-PHP-Script” * -R
Just cat the ID that you get and you will be able to check which script is here causing problem for you.
Use below mentioned command to get top memory consuming processes”
ps aux | head -1;ps aux –no-headers| sort -rn +3 | head
Use below command to get top cpu consuming processes:
ps aux | head -1;ps aux –no-headers | sort -rn +2 |more
You can check if any backup is going on, run the following commands:
# ps aux | grep “pkg”
# ps aux | grep “gzip”
# ps aux | grep “backup”
If any backup process is going on, kill that process.
We can trace the user responsible for high web server resource usage by the folowing command
cat /etc/httpd/logs/access_log | grep mp3
cat /etc/httpd/logs/access_log | grep rar
cat /etc/httpd/logs/access_log | grep wav etc
cat /etc/httpd/logs/access_log | grep 408
Can be used to check for DDOS attacks on the server.
cat /etc/httpd/logs/access_log | grep rar
Port scanning :
root@ [/tmp]# nmap localhost
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2007-10-04 13:22 MYT
Interesting ports on localhost (127.0.0.1):
Not shown: 1664 closed ports
PORT STATE SERVICE
1/tcp open tcpmux
21/tcp open ftp
25/tcp open smtp
53/tcp open domain
80/tcp open http
110/tcp open pop3
111/tcp open rpcbind
143/tcp open imap
443/tcp open https
465/tcp open smtps
631/tcp open ipp
783/tcp open spamassassin
953/tcp open rndc
993/tcp open imaps
995/tcp open pop3s
3306/tcp open mysql
Nmap finished: 1 IP address (1 host up) scanned in 0.125 seconds
root@ [/tmp]#
netstat -anp |grep :3306
DDOS ATTACK :
ps -aux|grep HTTP|wc –l : It will show you no of http connections to the server
netstat -lpn|grep :80 |awk ‘{print $5}’|sort : It will helpful to check the no of connections from a certain ip
Check for the ips and block them with firewalls as apf/csf/iptables
For iptables : iptables -A INPUT -s -j DROP
For apf : apf –d ip_address
For CSF : csf -d ip_adrress
If load due to SPAMD:
Issue
The load issues on a cpanel 11 box (later versions too) because of spamd are quite common, sometimes they may take more than 90% of the CPU. Here are some ways to resolve it.
[edit] Solution
We can use the following steps to resolve the issue in a considerable manner.
1. Edit the /etc/mail/spamassassin/local.cf file
vi /etc/mail/spamassassin/local.cf
then add the following lines to it
a) use_bayes 0 (this will disable some spamassassin functionalities)
b) lock_method flock
(Uncomment these options, if they are commented)
2) Run scripts2/autofixer/spamd_dbm_fix
a) Log into WHM and use another URL as “http://your server IP:2086//scripts2/autofixer”
then type the script name “spamd_dbm_fix” and run
b) Or you can also do the same from server back end as follows.
NOTE : If the load issue is related to a particular user then there is no need for running this,
you can simply enter into the ‘.spamassassin/’ directory for that user and delete the
files ‘__db.bayes_toks.new’ and *.lock.
Shows every process, their pid, % of cpu, memory size, name, and what syscall they are currently executing. Nifty.
whereis locates source/binary and manuals sections for specified files. The supplied names are first stripped of leading pathname components and any (single) trailing
extension of the form .ext, for example, .c. Prefixes of s. resulting from use of source code control are also dealt with. whereis then attempts to locate the desired program in
a list of standard Linux places. For example find out where is ls command?
$ whereis ls
cd /var/spool/exim/input
egrep “X-PHP-Script” * -R
