BASH script for increasing file descriptors on linux

increase_file_desc.sh

MAXFILE=65536
CURRENT_MAXFILE=$(ulimit -n)

function update_sysctl(){
    UPDT="fs.file-max = $MAXFILE"
    if ! grep "$UPDT" /etc/sysctl.conf; then
        echo "$UPDT" >> /etc/sysctl.conf
    fi
}

function update_limitsconf(){
        UPDT="* soft    nproc    $MAXFILE"
        if ! grep "$UPDT"  /etc/security/limits.conf; then
                echo "* soft    nproc   $MAXFILE" >>  /etc/security/limits.conf
                echo "* hard    nproc   $MAXFILE" >>  /etc/security/limits.conf
                echo "* soft    nofile  $MAXFILE" >>  /etc/security/limits.conf
                echo "* hard    nofile  $MAXFILE" >>  /etc/security/limits.conf
                echo "root soft nofile  $MAXFILE" >>  /etc/security/limits.conf
                echo "root hard nofile  $MAXFILE" >>  /etc/security/limits.conf
        fi
}

function update_session_perm(){
        UPDT="session required pam_limits.so"
        if ! grep "$UPDT"  /etc/pam.d/common-session; then
                echo "$UPDT" >>  /etc/pam.d/common-session
                echo "$UPDT" >>  /etc/pam.d/common-session-noninteractive
        fi
}

if [ $CURRENT_MAXFILE != $MAXFILE ]; then
    update_sysctl
    update_limitsconf
    update_session_perm
    # reboot ==> MAKE SURE YOU REBOOT!!
fi

Make sure you reboot