Difference between revisions of "20 Linux System Monitoring Tool"

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  # ps -auxf | sort -nr -k 3 | head -10
 
  # ps -auxf | sort -nr -k 3 | head -10
  
==#6: free - Memory Usage==
+
==#6: free - Pemakaian Memory==
  
The command free displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel.
+
Perintah free menampilkan jumlah total dari physical dan swap memory yang dipakai dan tidak dipakai di dalam sistem serta buffer yang digunakan oleh kernel.
  
 
  # free
 
  # free
  
Sample Output:
+
Contoh Output:
  
 
             total      used      free    shared    buffers    cached
 
             total      used      free    shared    buffers    cached
Line 205: Line 205:
 
  -/+ buffers/cache:    4061800    8241096
 
  -/+ buffers/cache:    4061800    8241096
 
  Swap:      1052248          0    1052248
 
  Swap:      1052248          0    1052248
 
=> Related: :
 
 
  1. Linux Find Out Virtual Memory PAGESIZE
 
  2. Linux Limit CPU Usage Per Process
 
  3. How much RAM does my Ubuntu / Fedora Linux desktop PC have?
 
  
 
==#7: iostat - Average CPU Load, Disk Activity==
 
==#7: iostat - Average CPU Load, Disk Activity==

Revision as of 09:50, 12 January 2011

Sumber: http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html

Anda butuh untuk memonitor performance Server Linux? Coba perintah berikut. Kebanyakan distribusi Linux akan di lengkapi dengan banyak monitoring tools. Tool ini akan mengukur aktifitas system. Dengan tool ini kita dapat mengetahui penyebab masalah yang terjadi. Perintah dasar yang di jelaskan berikut ini menjadi bermanfaat terutama untuk analisa dan debugging server untuk masalah,

  1. Mencari bottleneck.
  2. Disk (storage) bottleneck.
  3. CPU dan memory bottleneck.
  4. Network bottleneck.


#1: top - Perintah untuk melihat aktifitas proses

Top memberikan gambaran real time sebuah sistem yang sedang berjalan, proses yang ada. Defaultnya, dia akan menampilkan proses yang sedang menggunakan CPU dan mengupdate-nya setiap 5 detik.

top - 11:42:04 up  7:11,  8 users,  load average: 5.22, 5.42, 5.91
Tasks: 250 total,   2 running, 248 sleeping,   0 stopped,   0 zombie
Cpu(s):  2.9%us,  0.6%sy,  0.0%ni, 96.0%id,  0.0%wa,  0.0%hi,  0.4%si,  0.0%st
Mem:   2021012k total,  1558636k used,   462376k free,   218932k buffers
Swap:   976892k total,        0k used,   976892k free,   762492k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
 1477 root      20   0 84456  40m 7664 S    5  2.1  28:36.33 Xorg               
 3777 onno      20   0  499m 117m  23m S    4  5.9  28:17.09 firefox-bin        
 2281 onno      20   0  109m  16m  10m S    1  0.9   1:01.13 gnome-terminal     
 9961 root      20   0  4308  992  712 D    1  0.0   0:25.50 chown              
 9965 root      20   0  4072  708  476 D    1  0.0   0:24.45 chmod              
10970 root      20   0  2624 1204  844 R    1  0.1   0:00.03 top                
   78 root      20   0     0    0    0 R    0  0.0   0:08.87 kondemand/0        
10380 root      20   0  4136  900  476 D    0  0.0   0:05.40 chmod      

Perintah top mempunyai beberapa hot key yang sangat berguna seperti

Hot Key   Penggunaan
t 	Tampilkan rangkuman informasi off dan on
m 	Tampilkan informasi memory off dan on.
A      Urutkan tampilan berdasarkan pengguna paling besar dari sumber daya system.
f 	Masuk ke konfigurasi interaktif layar untuk top.
o 	Memungkinkan kita untuk secara interaktif memilih urutan didalam top
r 	Mengeluarkan perintah renice.
k 	Mengeluarkan perintah kill / bunuh sebuah proses.
z 	Menyalakan / mematikan color / mono.


=> Related: How do I Find Out Linux CPU Utilization?

#2: vmstat - Aktivitas Sistem, Informasi Perangkat Keras dan Hardware

Perintah vmstat melaporkan informasi tentang proses, memori, paging, block IO, traps dan aktifitas cpu.

# vmstat 3

Sample Outputs:

procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0      0 434272 221012 774744    0    0    59    42  253  393  4  2 85 10
 0  0      0 434560 221104 774776    0    0    32   132  829 1426  2  2 95  0
 0  0      0 435936 221040 773688    0    0    15   108  989 1416  1  1 98  0
 1  0      0 436644 221104 774032    0    0    12   167  805 1112  1  1 99  0
 0  0      0 507552 221108 703244    0    0    11     0  534  899  1  1 98  0
 0  0      0 506700 221176 703648    0    0    17   161  826 1255  1  1 98  0

Menampilkan pemakaian memori Slabinfo

# vmstat -m

Mendapatkan informasi tentang memori aktif / tidak aktif

# vmstat -a

#3: w - Mencari Siapa Yang Login dan Apa Yang Dia Lakukan

perintah w menampilkan informasi tentang user yang sedang berada di dalam mesin dan menampilkan proses dari user tersebut.

# w username
# w onno

Contoh Output:

 17:58:47 up 5 days, 20:28,  2 users,  load average: 0.36, 0.26, 0.24
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     pts/0    10.1.3.145       14:55    5.00s  0.04s  0.02s vim /etc/resolv.conf
root     pts/1    10.1.3.145       17:43    0.00s  0.03s  0.00s w

#4: uptime - Memberitahu Berapa Lama Sistem Telah Berjalan

Perintah uptime dapat digunakan untuk melihat berapa lama server telah berjalan. Lebih lengkapnya perintah ini memberi tahu waktu saat ini, berapa lama sistem berjalan, berapa banyak user yang sedang login dan rata-rata beban server pada 1, 5, dan 15 menit.

# uptime

Output:

 18:02:41 up 41 days, 23:42,  1 user,  load average: 0.91, 0.58, 0.54

1 dapat dianggap sebagai nilai beban optimal. Beban dapat berubah dari sistem ke sistem. Untuk sistem CPU tunggal 1 - 3 dan sistem SMP 6-10 nilai beban mungkin dapat diterima.

#5: ps - Menampilkan Proses

Perintah ps akan melaporkan snapshot dari proses saat ini. Untuk memilih semua proses gunakan option -A atau -e.

# ps -A

Contoh Output:

  PID TTY          TIME CMD
    1 ?        00:00:02 init
    2 ?        00:00:02 migration/0
    3 ?        00:00:01 ksoftirqd/0
    4 ?        00:00:00 watchdog/0
    5 ?        00:00:00 migration/1
    6 ?        00:00:15 ksoftirqd/1
....
.....
 4881 ?        00:53:28 java
 4885 tty1     00:00:00 mingetty
 4886 tty2     00:00:00 mingetty
 4887 tty3     00:00:00 mingetty
 4888 tty4     00:00:00 mingetty
 4891 tty5     00:00:00 mingetty
 4892 tty6     00:00:00 mingetty
 4893 ttyS1    00:00:00 agetty
12853 ?        00:00:00 cifsoplockd
12854 ?        00:00:00 cifsdnotifyd
14231 ?        00:10:34 lighttpd
14232 ?        00:00:00 php-cgi
54981 pts/0    00:00:00 vim
55465 ?        00:00:00 php-cgi
55546 ?        00:00:00 bind9-snmp-stat
55704 pts/1    00:00:00 ps

ps seperti top tetapi memberikan lebih banyak informasi.

Melihat output dalam format panjang

# ps -Al

Menghidupkan mode extra full (memperlihatkan argumen baris perintah pada proses):

# ps -AlF

Melihat thread ( LWP dan NLWP)

# ps -AlFH

Melihat thread setelah proses

# ps -AlLm

Menampilkan semua proses pada server

# ps ax
# ps axu

Menampilkan pohon proses

# ps -ejH
# ps axjf
# pstree

Menampilkan informasi keamanan

# ps -eo euser,ruser,suser,fuser,f,comm,label
# ps axZ
# ps -eM

Melihat setiap proses yang berjalan sebagai user onno

# ps -U onno -u onno u

Set output sesuai dengan yang kita inginkan

# ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
# ps axo stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm
# ps -eopid,tt,user,fname,tmout,f,wchan

Hanya menampilkan ID proses dari Lighttpd

# ps -C lighttpd -o pid=

atau

# pgrep lighttpd

atau

# pgrep -u vivek php-cgi

Menampilkan nama dari PID 55977

# ps -p 55977 -o comm=

Mencari tahu 10 proses yang memakan memori paling banyak

# ps -auxf | sort -nr -k 4 | head -10

Mencari tahu 10 proses yang memakan CPU paling banyak

# ps -auxf | sort -nr -k 3 | head -10

#6: free - Pemakaian Memory

Perintah free menampilkan jumlah total dari physical dan swap memory yang dipakai dan tidak dipakai di dalam sistem serta buffer yang digunakan oleh kernel.

# free

Contoh Output:

            total       used       free     shared    buffers     cached
Mem:      12302896    9739664    2563232          0     523124    5154740
-/+ buffers/cache:    4061800    8241096
Swap:      1052248          0    1052248

#7: iostat - Average CPU Load, Disk Activity

The command iostat report Central Processing Unit (CPU) statistics and input/output statistics for devices, partitions and network filesystems (NFS).

# iostat

Sample Outputs:

Linux 2.6.18-128.1.14.el5 (www03.nixcraft.in) 	06/26/2009

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           3.50    0.09    0.51    0.03    0.00   95.86 

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda              22.04        31.88       512.03   16193351  260102868
sda1              0.00         0.00         0.00       2166        180
sda2             22.04        31.87       512.03   16189010  260102688
sda3              0.00         0.00         0.00       1615          0

=> Related: : Linux Track NFS Directory / Disk I/O Stats

#8: sar - Collect and Report System Activity

The sar command is used to collect, report, and save system activity information. To see network counter, enter:

# sar -n DEV | more

To display the network counters from the 24th:

# sar -n DEV -f /var/log/sa/sa24 | more

You can also display real time usage using sar:

# sar 4 5

Sample Outputs:

Linux 2.6.18-128.1.14.el5 (www03.nixcraft.in) 		06/26/2009

06:45:12 PM       CPU     %user     %nice   %system   %iowait    %steal     %idle
06:45:16 PM       all      2.00      0.00      0.22      0.00      0.00     97.78
06:45:20 PM       all      2.07      0.00      0.38      0.03      0.00     97.52
06:45:24 PM       all      0.94      0.00      0.28      0.00      0.00     98.78
06:45:28 PM       all      1.56      0.00      0.22      0.00      0.00     98.22
06:45:32 PM       all      3.53      0.00      0.25      0.03      0.00     96.19
Average:          all      2.02      0.00      0.27      0.01      0.00     97.70

=> Related: : How to collect Linux system utilization data into a file

#9: mpstat - Multiprocessor Usage

The mpstat command displays activities for each available processor, processor 0 being the first one. mpstat -P ALL to display average CPU utilization per processor:

# mpstat -P ALL

Sample Output:

Linux 2.6.18-128.1.14.el5 (www03.nixcraft.in)	 	06/26/2009

06:48:11 PM  CPU   %user   %nice    %sys %iowait    %irq   %soft  %steal   %idle    intr/s
06:48:11 PM  all    3.50    0.09    0.34    0.03    0.01    0.17    0.00   95.86   1218.04
06:48:11 PM    0    3.44    0.08    0.31    0.02    0.00    0.12    0.00   96.04   1000.31
06:48:11 PM    1    3.10    0.08    0.32    0.09    0.02    0.11    0.00   96.28     34.93
06:48:11 PM    2    4.16    0.11    0.36    0.02    0.00    0.11    0.00   95.25      0.00
06:48:11 PM    3    3.77    0.11    0.38    0.03    0.01    0.24    0.00   95.46     44.80
06:48:11 PM    4    2.96    0.07    0.29    0.04    0.02    0.10    0.00   96.52     25.91
06:48:11 PM    5    3.26    0.08    0.28    0.03    0.01    0.10    0.00   96.23     14.98
06:48:11 PM    6    4.00    0.10    0.34    0.01    0.00    0.13    0.00   95.42      3.75
06:48:11 PM    7    3.30    0.11    0.39    0.03    0.01    0.46    0.00   95.69     76.89

=> Related: : Linux display each multiple SMP CPU processors utilization individually.

#10: pmap - Process Memory Usage

The command pmap report memory map of a process. Use this command to find out causes of memory bottlenecks.

# pmap -d PID

To display process memory information for pid # 47394, enter:

# pmap -d 47394

Sample Outputs:

47394:   /usr/bin/php-cgi
Address           Kbytes Mode  Offset           Device    Mapping
0000000000400000    2584 r-x-- 0000000000000000 008:00002 php-cgi
0000000000886000     140 rw--- 0000000000286000 008:00002 php-cgi
00000000008a9000      52 rw--- 00000000008a9000 000:00000   [ anon ]
0000000000aa8000      76 rw--- 00000000002a8000 008:00002 php-cgi
000000000f678000    1980 rw--- 000000000f678000 000:00000   [ anon ]
000000314a600000     112 r-x-- 0000000000000000 008:00002 ld-2.5.so
000000314a81b000       4 r---- 000000000001b000 008:00002 ld-2.5.so
000000314a81c000       4 rw--- 000000000001c000 008:00002 ld-2.5.so
000000314aa00000    1328 r-x-- 0000000000000000 008:00002 libc-2.5.so
000000314ab4c000    2048 ----- 000000000014c000 008:00002 libc-2.5.so
.....
......
..
00002af8d48fd000       4 rw--- 0000000000006000 008:00002 xsl.so
00002af8d490c000      40 r-x-- 0000000000000000 008:00002 libnss_files-2.5.so
00002af8d4916000    2044 ----- 000000000000a000 008:00002 libnss_files-2.5.so
00002af8d4b15000       4 r---- 0000000000009000 008:00002 libnss_files-2.5.so
00002af8d4b16000       4 rw--- 000000000000a000 008:00002 libnss_files-2.5.so
00002af8d4b17000  768000 rw-s- 0000000000000000 000:00009 zero (deleted)
00007fffc95fe000      84 rw--- 00007ffffffea000 000:00000   [ stack ]
ffffffffff600000    8192 ----- 0000000000000000 000:00000   [ anon ]
mapped: 933712K    writeable/private: 4304K    shared: 768000K

The last line is very important:

   * mapped: 933712K total amount of memory mapped to files
   * writeable/private: 4304K the amount of private address space
   * shared: 768000K the amount of address space this process is sharing with others

=> Related: : Linux find the memory used by a program / process using pmap command

#11 and #12: netstat and ss - Network Statistics

The command netstat displays network connections, routing tables, interface statistics, masquerade connections, and multicast memberships. ss command is used to dump socket statistics. It allows showing information similar to netstat. See the following resources about ss and netstat commands:

  • ss: Display Linux TCP / UDP Network and Socket Information
  • Get Detailed Information About Particular IP address Connections Using netstat Command

#13: iptraf - Real-time Network Statistics

The iptraf command is interactive colorful IP LAN monitor. It is an ncurses-based IP LAN monitor that generates various network statistics including TCP info, UDP counts, ICMP and OSPF information, Ethernet load info, node stats, IP checksum errors, and others. It can provide the following info in easy to read format:

  • Network traffic statistics by TCP connection
  • IP traffic statistics by network interface
  • Network traffic statistics by protocol
  • Network traffic statistics by TCP/UDP port and by packet size
  • Network traffic statistics by Layer2 address

Fig.02: General interface statistics: IP traffic statistics by network interface

Fig.02: General interface statistics: IP traffic statistics by network interface Fig.03 Network traffic statistics by TCP connection

Fig.03 Network traffic statistics by TCP connection

#14: tcpdump - Detailed Network Traffic Analysis

The tcpdump is simple command that dump traffic on a network. However, you need good understanding of TCP/IP protocol to utilize this tool. For.e.g to display traffic info about DNS, enter:

# tcpdump -i eth1 'udp port 53'

To display all IPv4 HTTP packets to and from port 80, i.e. print only packets that contain data, not, for example, SYN and FIN packets and ACK-only packets, enter:

# tcpdump 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)'

To display all FTP session to 202.54.1.5, enter:

# tcpdump -i eth1 'dst 202.54.1.5 and (port 21 or 20'

To display all HTTP session to 192.168.1.5:

# tcpdump -ni eth0 'dst 192.168.1.5 and tcp and port http'

Use wireshark to view detailed information about files, enter:

# tcpdump -n -i eth1 -s 0 -w output.txt src or dst port 80

#15: strace - System Calls

Trace system calls and signals. This is useful for debugging webserver and other server problems. See how to use to trace the process and see What it is doing.

#16: /Proc file system - Various Kernel Statistics

/proc file system provides detailed information about various hardware devices and other Linux kernel information. See Linux kernel /proc documentations for further details. Common /proc examples:

# cat /proc/cpuinfo
# cat /proc/meminfo
# cat /proc/zoneinfo
# cat /proc/mounts

17#: Nagios - Server And Network Monitoring

Nagios is a popular open source computer system and network monitoring application software. You can easily monitor all your hosts, network equipment and services. It can send alert when things go wrong and again when they get better. FAN is "Fully Automated Nagios". FAN goals are to provide a Nagios installation including most tools provided by the Nagios Community. FAN provides a CDRom image in the standard ISO format, making it easy to easilly install a Nagios server. Added to this, a wide bunch of tools are including to the distribution, in order to improve the user experience around Nagios.

18#: Cacti - Web-based Monitoring Tool

Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices. It can provide data about network, CPU, memory, logged in users, Apache, DNS servers and much more. See how to install and configure Cacti network graphing tool under CentOS / RHEL.

#19: KDE System Guard - Real-time Systems Reporting and Graphing

KSysguard is a network enabled task and system monitor application for KDE desktop. This tool can be run over ssh session. It provides lots of features such as a client/server architecture that enables monitoring of local and remote hosts. The graphical front end uses so-called sensors to retrieve the information it displays. A sensor can return simple values or more complex information like tables. For each type of information, one or more displays are provided. Displays are organized in worksheets that can be saved and loaded independently from each other. So, KSysguard is not only a simple task manager but also a very powerful tool to control large server farms. Fig.05 KDE System Guard

Fig.05 KDE System Guard {Image credit: Wikipedia}

See the KSysguard handbook for detailed usage.

#20: Gnome System Monitor - Real-time Systems Reporting and Graphing

The System Monitor application enables you to display basic system information and monitor system processes, usage of system resources, and file systems. You can also use System Monitor to modify the behavior of your system. Although not as powerful as the KDE System Guard, it provides the basic information which may be useful for new users:

  • Displays various basic information about the computer's hardware and software.
  • Linux Kernel version
  • GNOME version
  • Hardware
  • Installed memory
  • Processors and speeds
  • System Status
  • Currently available disk space
  • Processes
  • Memory and swap space
  • Network usage
  • File Systems
  • Lists all mounted filesystems along with basic information about each.

Fig.06 The Gnome System Monitor application

Fig.06 The Gnome System Monitor application


Bonus: Tools Tambahan

Beberapa tool lainnya:

  • nmap - scan port yang terbuka pada server anda.
  • lsof - daftar file yang terbuka, koneksi jaringan dan banyak lagi.
  • ntop web based tool - ntop adalah tool terbaik untuk melihat penggunaan jaringan, mirip dengan perintah top tetapi ini adalah aplikasi untuk memonitor lalu lintas jaringan. Anda dapat melihat status jaringan, lalu lintas jaringan pada protokol UDP, TCP, DNS, HTTP dan protokol lainnya.

adalah alat terbaik untuk melihat penggunaan jaringan dalam cara yang mirip dengan apa perintah atas tidak untuk proses yaitu membutuhkan software monitoring lalu lintas jaringan. Anda dapat melihat status jaringan, protokol distribusi bijaksana lalu lintas untuk UDP, TCP, DNS, HTTP dan protokol lainnya. is the best tool to see network usage in a way similar to what top command does for processes i.e. it is network traffic monitoring software. You can see network status, protocol wise distribution of traffic for UDP, TCP, DNS, HTTP and other protocols.

  • Conky - Monitoring tool yang bagus untuk X Window System. Conky sangat konfigurable dan bisa memonitor banyak variable sistem termasuk status CPU, memori, sisa swap, disk penyimpanan, temperature, proses, interface jaringan, power batre, system messages, inbox e-mail dan lain-lain.
  • GKrellM - Dapat digunakan untuk memonitor status CPU, memori utama, hard disk, interface network, mailbox lokal dan remote dan banyak hal lainnya.
  • vnstat - vnStat adalah network traffic monitor berbasis console. Tool ini menjaga log lalu lintas jaringan per jam, harian dan bulanan dari interface yang dipilih.
  • htop - htop adalah peningkatan versi dari top, melihat proses secara interaktif yang dapat menampilkan proses menggunakan bentuk pohon.
  • mtr - mtr menggabungkan fungsi traceroute dan program ping pada sebuah tool diagnosa jaringan.


Referensi

Pranala Menarik