At home, I run 3 machines as small servers, but I haven’t set up a monitoring system. Honestly, I probably never will.
So I did the next best thing: a nice MOTD.
Inspiration
A friend who’s also an IT engineer showed me this reddit post, and the associated Github repo.
These two articles were also quite useful ownyourbits.com article and linuxconfig.org.
Scripts
RAM usage
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| #!/bin/bash
bar_fill="="
bar_empty="\033[1;90m=\033[0m"
endpost_left="["
endpost_right="]"
line=" "
echo -e "\n\033[1m\e[38;5;117mRAM\e[0m\033[0m"
echo -e " Total\tUsed\t\tFree\t\tBuff/Cache"
free | cut -d':' -f 2 -sz | while read totl used free shared bufc available rest; do
totl_mb=$(echo "scale=2;"$totl" / 1024" | bc -l)
used_mb=$(echo "scale=2;"$used" / 1024" | bc -l)
free_mb=$(echo "scale=2;"$free" / 1024" | bc -l)
bufc_mb=$(echo "scale=2;"$bufc" / 1024" | bc -l)
echo -e "$line"$totl_mb"MB\t"$used_mb"MB\t"$free_mb"MB\t"$bufc_mb"MB"
output=$endpost_left
percent=$(echo "scale=0; 100 * "$used" / "$totl | bc -l)
# 0-69 colored green
for ((i=1; i<=34; i++))
do
if [ $(($percent / 2 + 2)) -gt $i ]
then
output+="\033[1;92m$bar_fill\033[0m"
else
output+=$bar_empty
fi
done
# 70-84 colored yellow
for ((i=35; i<=42; i++))
do
if [ $(($percent / 2 + 2)) -gt $i ]
then
output+="\033[1;93m$bar_fill\033[0m"
else
output+=$bar_empty
fi
done
# 85-100 colored red
for ((i=43; i<=50; i++))
do
if [ $(($percent / 2 + 2)) -gt $i ]
then
output+="\033[1;91m$bar_fill\033[0m"
else
output+=$bar_empty
fi
done
output+=$endpost_right" "
output+="\033[1;90m"$(echo "scale=2; 100 * "$used" / "$totl | bc -l)"% used\033[0m"
echo -e " "$output
done
|
Disk usage
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| #!/bin/bash
bar_fill="="
bar_empty="\033[1;90m=\033[0m"
endpost_left="["
endpost_right="]\n"
line=" "
declare -a df_disks=()
# df command to get disk usage
declare df_disks=$(df -h | grep '^/dev' | grep -v '/dev/loop' | grep -v '/boot/efi')
echo ""
echo -e "\033[1m\e[38;5;117mFilesystem\e[0m\033[0m $line Size Used Avail Use% Mounted on"
IFS=$'\n'
for df_line in $df_disks
do
echo "$line$df_line"
output=$endpost_left
diskPercent="$(sed 's/%.*//' <<< "$df_line" | grep -oP "\S+$" )"
# 0-69 colored green
for ((i=1; i<=34; i++))
do
if [ $(($diskPercent / 2 + 2)) -gt $i ]
then
output+="\033[1;92m$bar_fill\033[0m"
else
output+=$bar_empty
fi
done
# 70-84 colored yellow
for ((i=35; i<=42; i++))
do
if [ $(($diskPercent / 2 + 2)) -gt $i ]
then
output+="\033[1;93m$bar_fill\033[0m"
else
output+=$bar_empty
fi
done
# 85-100 colored red
for ((i=43; i<=50; i++))
do
if [ $(($diskPercent / 2 + 2)) -gt $i ]
then
output+="\033[1;91m$bar_fill\033[0m"
else
output+=$bar_empty
fi
done
output+=$endpost_right
printf "$line$output"
done
|
Services
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| #!/bin/bash
ServiceFile="/etc/update-motd.d/services-list.txt"
declare -a serviceStatus=()
declare -a servicesName=()
readarray -t servicesName < $ServiceFile
# Get status of all services
for service in "${servicesName[@]}"
do
if [ -n "$service" ]; then
serviceStatus+=($(systemctl is-active "$service.service"))
fi
done
# Maximum column width
width=$((49-2))
# Current line and line length
line=" "
lineLen=0
echo ""
echo -e "\033[1m\e[38;5;117mServices running\e[0m\033[0m"
longest=$(wc -L $ServiceFile | sed -e 's/\s.*$//')
for i in ${!serviceStatus[@]}
do
# Next line and next line length
next=" ${serviceName[$i]}: \e[5m${serviceStatus[$i]}"
nextLen=$((1+${#next}))
# If the current line will exceed the max column with then echo the current line and start a new line
if [[ $((lineLen+nextLen)) -gt width ]]; then
echo -e "$line"
lineLen=0
line=" "
fi
lineLen=$((lineLen+nextLen))
# Color the next line green if it's active, else red
if [[ "${serviceStatus[$i]}" == "active" ]]; then
line+="${servicesName[$i]}: \e[32m✔ ${serviceStatus[$i]}\e[0m "
else
line+="${servicesName[$i]}: \e[31m▲ ${serviceStatus[$i]}\e[0m "
fi
done
# echo what is left
echo -e "$line"
|
Uptime & CPU Load
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| #!/bin/bash
# R cup rer le loadavg
read one five fifteen rest < /proc/loadavg
echo ""
echo -e "\033[1m\e[38;5;117mUptime\e[0m\033[0m"
echo " "$(uptime -p)
echo -e " since" $(uptime -s)
echo ""
echo -e "\033[1m\e[38;5;117mCPU Load\e[0m\033[0m"
echo -e " 1min\t\t5min\t\t15min"
echo -e " $one\t\t$five\t\t$fifteen\n"
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