18 Command Line Tools to Monitor Linux Performance

Netstat?is a command line tool for monitoring?incoming?and?outgoing network?packets statistics as well as interface statistics. It is very useful tool for every system administrator to monitor network performance and troubleshoot network related problems.

# netstat -a | more
Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address               Foreign Address             State

tcp        0      0 :mysql                     :                         LISTEN

tcp        0      0 :sunrpc                    :                         LISTEN

tcp        0      0 :realm-rusd                :                         LISTEN

tcp        0      0 :ftp                       :                         LISTEN

tcp        0      0 localhost.localdomain:ipp   :                         LISTEN

tcp        0      0 localhost.localdomain:smtp  :                         LISTEN

tcp        0      0 localhost.localdomain:smtp  localhost.localdomain:42709 TIME_WAIT

tcp        0      0 localhost.localdomain:smtp  localhost.localdomain:42710 TIME_WAIT

tcp        0      0 :http                      :                         LISTEN

tcp        0      0 :ssh                       :                         LISTEN

tcp        0      0 :https                     :*                         LISTEN

More Netstat examples :?.

6. Htop – Linux Process Monitoring

Htop?is a much advanced interactive and real time Linux process monitoring tool. This is much similar to Linux?top command?but it has some rich features like?user friendly interface to manage process,?shortcut keys,?vertical and horizontal view of the processes?and much more. Htop is a third party tool and doesn’t included in Linux systems,you need to install it using?YUM?package manager tool. For more information on installation read our article below.

# htop

For Htop installation read :?

7. Iotop – Monitor Linux Disk I/O

Iotop?is also much similar to?top command?and?Htop program,but it has accounting function to monitor and display real time?Disk I/O?and?processes. This tool is much useful for finding the exact process and high used disk read/writes of the processes.

# iotop

For Ioptop installation and usage read :?

8. Iostat – Input/Output Statistics

IoStat?is simple tool that will collect and show system?input?and?output?storage device statistics. This tool is often used to trace storage device performance issues includingdevices,?local disks,?remote disks?such as?NFS.

# iostat
Linux 2.6.18-238.9.1.el5 (tecmint.com)         09/13/2012
avg-cpu:  %user   %nice %system %iowait  %steal   %idle

2.60    3.65    1.04    4.29    0.00   88.42
Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn

cciss/c0d0       17.79       545.80       256.52  855159769  401914750

cciss/c0d0p1      0.00         0.00         0.00       5459       3518

cciss/c0d0p2     16.45       533.97       245.18  836631746  384153384

cciss/c0d0p3      0.63         5.58         3.97    8737650    6215544

cciss/c0d0p4      0.00         0.00         0.00          8          0

cciss/c0d0p5      0.63         3.79         5.03    5936778    7882528

cciss/c0d0p6      0.08         2.46         2.34    3847771    3659776

For more Iostat usage and examples visit :?

9. IPTraf – Real Time IP LAN Monitoring

IPTraf?is an open source console-based real time network (IP LAN) monitoring utility forLinux. It collects a variety of information such as IP traffic monitor that passes over the network,including TCP flag information,ICMP details,TCP/UDP traffic breakdowns,TCP connection packet and byne counts. It also gathers information of general and detaled interface statistics of TCP,UDP,IP,ICMP,non-IP,IP checksum errors,interface activity etc.