How to check network performance in Linux

[intapiuser]

You might need to check the network performance between the nodes of the multi-node cluster or between a Linux server and a remote database on Linux. 

1., Install the following tool on each node: 

For Ubuntu:
sudo apt install iperf3

For Red Hat / CentOS / Amazon Linux:
sudo yum install iperf

2. Start the server on the first node:

iperf3 -s  (or 'iperf -s')

3. Notice its port from the output and then launch the client on another node / another server: 

iperf3 -c IP_of_the_server_above -p port_of_the_server

Feel free to heck the the following combination: node1 - node2 , node1 - node3 , node2 - node3 (or Sisense server  - database server)

And example output:

-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 172.16.0.98, port 49216
[ 5] local 172.16.0.38 port 5201 connected to 172.16.0.98 port 49218
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 105 MBytes 884 Mbits/sec
[ 5] 1.00-2.00 sec 110 MBytes 922 Mbits/sec
[ 5] 2.00-3.00 sec 110 MBytes 924 Mbits/sec
[ 5] 3.00-4.00 sec 110 MBytes 923 Mbits/sec
[ 5] 4.00-5.00 sec 110 MBytes 926 Mbits/sec
[ 5] 5.00-6.00 sec 110 MBytes 919 Mbits/sec
[ 5] 6.00-7.00 sec 110 MBytes 921 Mbits/sec
[ 5] 7.00-8.00 sec 110 MBytes 922 Mbits/sec
[ 5] 8.00-9.00 sec 110 MBytes 926 Mbits/sec
[ 5] 9.00-10.00 sec 109 MBytes 913 Mbits/sec
[ 5] 10.00-10.05 sec 4.99 MBytes 927 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.05 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-10.05 sec 1.07 GBytes 918 Mbits/sec receiver