mymotd.sh

#!/bin/bash

# Only print for interactive shells.
if [[ $- != *il* ]]; then
    return 0
fi

function get_zpool_status {
    pool_name="$1"
    res=$(zpool list | grep "$pool_name" | awk '{print $3 " / " $2 "\t " $10}')
    pool_status=$(echo "$res" | awk '{print $4}')

    if [ "$pool_status" == "ONLINE" ]; then
        color="\033[0;32m"
    else
        color="\033[0;31m"
    fi

    echo -e "${res//$pool_status/${color}${pool_status}\033[0m}"
}

FAILED=$(systemctl list-units --state=failed --no-legend --plain)

sensor="coretemp-isa-0000"

USER=$(whoami)
HOSTNAME=$(uname -n)
ROOT=$(get_zpool_status "rpool")
TANK=$(get_zpool_status "tank")
TEMPERATURE=$(sensors $sensor | awk 'NR==3{print $4}')

MEMORY1=$(free -t -m | grep "Mem" | awk '{print $3;}')
MEMORY2=$(free -t -m | grep "Mem" | awk '{print $2 " MB";}')
PSA=$(ps -Afl | wc -l)

#System uptime
uptime=$(cut </proc/uptime -f1 -d.)
upDays=$((uptime / 60 / 60 / 24))
upHours=$((uptime / 60 / 60 % 24))
upMins=$((uptime / 60 % 60))
upSecs=$((uptime % 60))

#System load
LOAD=$(awk '{print $1", "$2", "$3}' /proc/loadavg)

IP_BR0=$(ifconfig br0 | grep -E 'inet ' | awk '{print $2}')

# disk temperature
DISKS=($(lsblk -dl | tail -n +2 | grep -F -v "SWAP" | cut -d' ' -f1))
DISK_TEMPS=''

for D in "${DISKS[@]}"; do
    DEV="/dev/${D}"
    temp=$(smartctl -A $DEV | grep 'Temperature' | head -n 1 | grep -oE '\s[0-9]{2}(\s|$)' | xargs)
    health=$(smartctl -H $DEV | grep 'test result' | cut -d':' -f2 | xargs)
    DISK_TEMPS+="$D,$temp,$health\n"
done

# VMs
VMS=$(virsh list --all --name)
VM_OUTPUT=''

for N in $VMS; do
    state=$(virsh domstate "$N" --reason | head -n 1)

    domif=$(virsh domiflist "$N" | awk 'NR==3')
    if=$(echo "$domif" | awk '{print $1}')

    mac=$(echo "$domif" | awk '{print $5}')
    ip=$(arp -n | grep "$mac" | awk '{print $1}')

    #memory
    memstat=$(virsh dommemstat "$N" 2>/dev/null)
    avail=$(echo "$memstat" | grep -oE 'available [0-9]+' | awk '{print $2}')
    usabl=$(virsh dommemstat "$N" 2>/dev/null | grep -oE 'usable [0-9]+' | awk '{print $2}')

    mem="-"
    [ -z "$avail" ] || [ -z "$usabl" ] || mem="$((($avail - $usabl) / 1024)) / $(($avail / 1024))"

    VM_OUTPUT+="$N,$state,$if,$ip,$mem\n"
done

#Return message
[ -z "$TEMPERATURE" ] && TEMPERATURE="not available"
[ -x "$(command -v sensors)" ] || TEMPERATURE="lm_sensors not found"

echo -ne "
  System information
  ------------------
  Hostname:               $HOSTNAME
  Release:                $(</etc/redhat-release)
  Users:                  Currently $(users | wc -w) user(s) logged on
  IPv4 address for br0:   $IP_BR0

  System load:            $LOAD (1, 5, 15 min)
  Memory usage:           $MEMORY1 / $MEMORY2
  Swap usage:             $(free -m | tail -n 1 | awk '{print $3}') MB
  Processes:              $PSA
  Uptime:                 $upDays days $upHours hours $upMins minutes $upSecs seconds
  zpool root:             $ROOT
  zpool tank:             $TANK
  CPU Temperature:        $TEMPERATURE

  Disks
  ------------
"
printf "$DISK_TEMPS" | column --table --table-columns='Device,Temp (°C),Health' --separator=',' | awk '{print "  " $0}'

echo -ne "
  VM Information
  --------------
"
printf "$VM_OUTPUT" | column --table --table-columns='Name,State,Interface,IPv4,Memory (MB)' --separator=',' | awk '{print "  " $0}'
echo

if [[ -n "${FAILED}" ]]; then
    COUNT=$(wc -l <<<"${FAILED}")
    echo -e "  => Systemd: \033[31m${COUNT}\033[39m failed units:"
    awk '{ print "     " $1 }' <<<"${FAILED}"
fi