feat: add scripts to get stats from master node

backend/scripts/cpu.sh

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+#!/bin/bash
+
+# Returns CPU percentages of all machines in the cluster
+# Example output: steffe3 3.5
+
+parallel --nonall --slf /home/rock/macchine.txt top -bn1 | grep "Cpu(s)" | sed "s/.*, *\([0-9.]*\)%* id.*/\1/" | sed "s/^/100 - /" | bc

backend/scripts/memory.sh

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+#!/bin/bash
+
+# Returns used and total memory (in MB) of all machines in the cluster
+# Example output: steffe1 141 3814
+
+parallel --nonall --slf /home/rock/macchine.txt 'echo $HOSTNAME $(free -m | awk '\''/Mem/{print $3" "$2}'\'')'

backend/scripts/network.sh

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+#!/bin/bash
+
+# Returns received and transmitted bytes of all machines in the cluster
+# Example output: steffe14 3581663131 3305835017
+
+parallel --nonall --slf /home/rock/macchine.txt 'echo $HOSTNAME $(cat /sys/class/net/[e]*/statistics/{r,t}x_bytes)'

backend/scripts/storage.sh

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+#!/bin/bash
+
+# Returns used and free disk space of all machines in the cluster
+# Example output: steffe8 9.2G 47G
+
+parallel --nonall --slf /home/rock/macchine.txt 'echo $HOSTNAME $(df -Ph | grep mmcblk0p5 | awk '\''{print $3" "$4}'\'')'

backend/scripts/uptime.sh

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+#!/bin/bash
+
+# Returns Unix uptime, in seconds, of all machines in the cluster
+# Example output: steffe1 1656959
+
+parallel --nonall --slf /home/rock/macchine.txt 'echo $HOSTNAME $(cut -f1 -d. /proc/uptime)'