0. Required packages
yum install sysstat
1. Cheat-Sheet
systemctl enable sysstat
systemctl start sysstat
sar -u -f /var/log/sa/sa05 # CPU Usage on 5th day of current month
sar -r -f /var/log/sa/sa05 # Memory Usage of 5th day of current month
sar -n # Network statistic of today
sar -d # Disk usage of today
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