======General Linux System Operations======
======System Monitoring======
======sysstat/sar======
  * A package of tools that provides CPU, network and other system statistics.
  * sar (system activity report) is the tool for accessing the statistics data.

======Examples of network stats command======

====Network Device Stats=====
<code>
sar -n DEV 1 3
</code>

<code>
# sar -n DEV 1 3
Linux 3.10.0-514.21.2.el7.x86_64 (ip-10-0-1-228.us-east-2.compute.internal) 	09/01/2017    _x86_64_	(1 CPU)

03:12:18 PM     IFACE   rxpck/s   txpck/s    rxkB/s    txkB/s   rxcmp/s   txcmp/s  rxmcst/s
03:12:19 PM      eth0      1.00      1.00      0.04      0.20      0.00      0.00      0.00
03:12:19 PM        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00

</code>

====Network Device Error Stats=====
<code>
sar -n EDEV 1 3
</code>

<code>
# sar -n EDEV 1 3
Linux 3.10.0-514.21.2.el7.x86_64 (ip-10-0-1-228.us-east-2.compute.internal) 	09/01/2017    _x86_64_	(1 CPU)

02:54:13 PM     IFACE   rxerr/s   txerr/s    coll/s  rxdrop/s  txdrop/s  txcarr/s  rxfram/s  rxfifo/s  txfifo/s
02:54:14 PM      eth0      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00
02:54:14 PM        lo      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00      0.00
</code>