Check for RAM and other requirements

Here's how we check RAM in current platform (although of course minimum requirements are higher in HH): https://github.com/Security-Onion-Solutions/securityonion-setup/blob/master/bin/sosetup#L211-L221

# Check amount of system RAM (MB)
TOTAL_MEM=`grep MemTotal /proc/meminfo | awk '{print $2}' | sed -r 's/.{3}$//'`
# Make RAM # human readable (GB)
HR_MEM=$((TOTAL_MEM / 1000))
# Text for minimum memory check
MEM_TEXT="This machine currently has "$HR_MEM"GB of RAM allocated.\n\nFor best performance, please ensure the machine is allocated at least 8GB of RAM.\n\nPlease consult the following link for more information:\nhttps://securityonion.net/docs/Hardware\n
Select 'No' to stop setup and adjust the amount of RAM allocated to this machine.\n
Otherwise, select 'Yes' to continue."
# Text for minimum core check
CORE_TEXT="This machine currently has "$CORES" processor core(s) allocated.\n\nFor best performance, please ensure the machine is allocated at least 2 processor cores.\n\nPlease consult the following link for more information:\nhttps://securityonion.net/docs/Hardware\n
Select 'No' to stop setup and adjust the number of processor cores allocated to this machine.\n
Otherwise, select 'Yes' to continue."
# CORES is the number of CPU cores in the box
# This is used for limiting IDS_LB_PROCS and BRO_LB_PROCS
CORES=`grep -c ^processor /proc/cpuinfo`
if [ $TOTAL_MEM -lt 8000 ]; then
    promptyesno "$MEM_TEXT"
    [ $? = 1 ] && exit 1
        [ $DEBUG -eq 1 ] && echo "DEBUG: Continuing, despite low RAM."
fi

if [ $CORES -lt 2 ]; then
    promptyesno "$CORE_TEXT"
    [ $? = 1 ] && exit 1
    [ $DEBUG -eq 1 ] && echo "DEBUG: Continuing, despite low core count."
fi

Security-Onion-Solutions / securityonion

Check for RAM and other requirements #579