if [ `cat $SHMMAX` -lt 2147483648 ]; then
    echo 2147483648 > $SHMMAX;
    if ! grep -q 'kernel.shmmax' $SYSCTLCONF; then
        echo "kernel.shmmax = 2147483648" >> $SYSCTLCONF
    else
        sed -i 's,^kernel.shmmax=.*$,kernel.shmmax = 2147483648,g' $SYSCTLCONF
    fi
fi