Revision as of 15:17, 13 November 2018

Common Tools

Listening Ports

netstat

~$ netstat -lnp
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:17003         0.0.0.0:*               LISTEN      -
tcp        0      0 127.0.0.1:40333         0.0.0.0:*               LISTEN      -
udp    42240      0 127.0.0.1:8125          0.0.0.0:*                           -
udp    32256      0 169.254.0.2:53          0.0.0.0:*                           -

process activity

top

~$ top

LoadAvg Load average over 1, 5, and 15 minutes. divide by number of cores to determine load.

ps

ps -AlH

This shows all the processes running, in long format, with the extra full format output

Network Throughput

iperf

requires a server/client setup that communicates over port 5001. generally server/client placement is dependent on network accessibility, ie. server would be placed outside of the network, client within. You may need to open 5001 on both sides however, in case established/related is not implicitly accepted from the client side > out.

Server side

~$ sudo yum install -y iperf
sudo iptables -A INPUT -p tcp --dport 5001 -j ACCEPT -m comment --comment "iperf - 5001"
~$ iperf -s

Example:

$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local 10.0.0.1 port 5001 connected with 10.0.0.2 port 47552
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  76.6 MBytes  64.1 Mbits/sec
[  5] local 10.0.0.1 port 5001 connected with 10.0.0.2 port 39914
[  5]  0.0-10.0 sec  84.5 MBytes  70.6 Mbits/sec

Client side

~$ iperf -c target.ip -p port.number

Example

$ iperf -c 10.0.0.1 -p 5001
------------------------------------------------------------
Client connecting to 10.0.0.1, TCP port 5001
TCP window size:  466 KByte (default)
------------------------------------------------------------
[  3] local 10.0.0.1 port 39914 connected with 10.0.0.2 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  84.5 MBytes  70.8 Mbits/sec

Disk

lsblk

Shows a list of block devices. Useful in showing mount points, size, name, etc.

~$ lsblk --all
NAME                        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
loop0                         7:0    0        0 loop
loop1                         7:1    0        0 loop
loop2                         7:2    0        0 loop
loop3                         7:3    0        0 loop
loop4                         7:4    0        0 loop
loop5                         7:5    0        0 loop
loop6                         7:6    0        0 loop
loop7                         7:7    0        0 loop
sr0                          11:0    1 1024M  0 rom
sda                           8:0    0    8G  0 disk
├─sda1                        8:1    0  500M  0 part /boot
└─sda2                        8:2    0  7.5G  0 part
  ├─VolGroup-lv_root (dm-0) 253:0    0  6.7G  0 lvm  /
  └─VolGroup-lv_swap (dm-1) 253:1    0  816M  0 lvm  [SWAP]