Useful Server Commands

gistfile1.sh

# Check which IPs are hitting a server
netstat -plant | awk '$4~/:80$/{print$5}' | awk -F: '{print$(NF-1)}' | sort | uniq -c | sort -nr | head

# Apache Report
curl -skL apachebuddy.pl | perl

# Last 200 commands of error log
tail -n 200 /var/log/apache2/error.log

# Memory / Max Clients
echo  Processors -- `grep proc  /proc/cpuinfo | wc -l`; echo -e Memory "\t  " -- `free -m | grep Mem | awk '{print $2, "MB"}'`;   ps -H h -ylC apache | perl -lane '$s+=$F[7];$i++;END{printf"Avg %mem / Apache process = %.1fMB\n",$s/$i/1024}' ; echo ""; grep -i maxclients /etc/apache2/apache2.conf | grep -v ^# | head -1 | awk '{print $1, "is set to --", $2}'; echo ""; echo "Current connections :"; pstree -G | grep apache; echo ""; echo "IPs conneting now :"; netstat -ant | grep \:80 | egrep "ESTABLISHED|SYN_RECV" | awk '{ print $5 }' | sed -e 's/\:\:ffff\://g' | awk -F: '{print $1}' | sort | uniq -c | sort -nr |awk '{print $1 " "$2}' | head ; echo -e "\nErrors from apache logs: ";  grep -i maxclients /var/log/apache2/error.log;  echo -e "\nDisk space Status :"; df -h /;

#Fix Shellshock
mkdir src
cd src
wget http://ftp.gnu.org/gnu/bash/bash-4.3.tar.gz
#download all patches
for i in $(seq -f "%03g" 0 26); do wget     http://ftp.gnu.org/gnu/bash/bash-4.3-patches/bash43-$i; done
tar zxvf bash-4.3.tar.gz 
cd bash-4.3
#apply all patches
for i in $(seq -f "%03g" 0 26);do patch -p0 < ../bash43-$i; done
#build and install
./configure && make && make install
cd .. 
cd ..
rm -r src

# Fix Offending key in ~/.ssh/known_hosts file where NUMBER is Offending Key
perl -pi -e 's/\Q$_// if ($. == NUMBER);' ~/.ssh/known_hosts