Top 10 System Monitoring Tools
1. Top
This is a small tool which is pre-installed in many unix systems. When you want an overview of all the processes or threads running in the system: top is a good tool. You can order these processes on different criteria and the default criteria is CPU.
2. htop
Htop is essentially an enhanced version of top. It’s easier to sort by processes. It’s visually easier to understand and has built in commands for common things you would like to do. Plus it’s fully interactive.
3. atop
Atop monitors all processes much like top and htop, unlike top and htop however it has daily logging of the processes for long-term analysis. It also shows resource consumption by all processes. It will also highlight resources that have reached a critical load.
4. apachetop
Apachetop monitors the overall performance of your apache webserver. It’s largely based on mytop. It displays current number of reads, writes and the overall number of requests processed.
5. ftptop
ftptop gives you basic information of all the current ftp connections to your server such as the total amount of sessions, how many are uploading and downloading and who the client is.
6. mytop
mytop is a neat tool for monitoring threads and performance of mysql. It gives you a live look into the database and what queries it’s processing in real time.
7. powertop
powertop helps you diagnose issues that has to do with power consumption and power management. It can also help you experiment with power management settings to achieve the most efficient settings for your server. You switch tabs with the tab key.
8. iotop
iotop checks the I/O usage information and gives you a top-like interface to that. It displays columns on read and write and each row represents a process. It also displays the percentage of time the process spent while swapping in and while waiting on I/O.
Network related monitoring
9. ntopng
ntopng is the next generation of ntop and the tool provides a graphical user interface via the browser for network monitoring. It can do stuff such as: geolocate hosts, get network traffic and show ip traffic distribution and analyze it.
10. iftop
iftop is similar to top, but instead of mainly checking for cpu usage it listens to network traffic on selected network interfaces and displays a table of current usage. It can be handy for answering questions such as “Why on earth is my internet connection so slow?!”.
11. jnettop
jnettop visualises network traffic in much the same way as iftop does. It also supports customizable text output and a machine-friendly mode to support further analysis.
12. bandwidthd
BandwidthD tracks usage of TCP/IP network subnets and visualises that in the browser by building a html page with graphs in png. There is a database driven system that supports searching, filtering, multiple sensors and custom reports.
13. EtherApe
EtherApe displays network traffic graphically, the more talkative the bigger the node. It either captures live traffic or can read it from a tcpdump. The displayed can also be refined using a network filter with pcap syntax.
14. ethtool
ethtool is used for displaying and modifying some parameters of the network interface controllers. It can also be used to diagnose Ethernet devices and get more statistics from the devices.
15. NetHogs
NetHogs breaks down network traffic per protocol or per subnet. It then groups by process. So if there’s a surge in network traffic you can fire up NetHogs and see which process is causing it.
16. iptraf
iptraf gathers a variety of metrics such as TCP connection packet and byte count, interface statistics and activity indicators, TCP/UDP traffic breakdowns and station packet and byte counts.
17. ngrep
ngrep is grep but for the network layer. It’s pcap aware and will allow to specify extended regular or hexadecimal expressions to match against packets of .
18. MRTG
MRTG was orginally developed to monitor router traffic, but now it’s able to monitor other network related things as well. It typically collects every five minutes and then generates a html page. It also has the capability of sending warning emails.
19. bmon
Bmon monitors and helps you debug networks. It captures network related statistics and presents it in human friendly way. You can also interact with bmon through curses or through scripting.
20. traceroute
Traceroute is a built-in tool for displaying the route and measuring the delay of packets across a network.
21. IPTState
IPTState allows you to watch where traffic that crosses your iptables is going and then sort that by different criteria as you please. The tool also allows you to delete states from the table.
22. darkstat
Darkstat captures network traffic and calculates statistics about usage. The reports are served over a simple HTTP server and gives you a nice graphical user interface of the graphs.
23. vnStat
vnStat is a network traffic monitor that uses statistics provided by the kernel which ensures light use of system resources. The gathered statistics persists through system reboots. It has color options for the artistic sysadmins.
24. netstat
Netstat is a built-in tool that displays TCP network connections, routing tables and a number of network interfaces. It’s used to find problems in the network.
25. ss
Instead of using netstat, it’s however preferable to use ss. The ss command is capable of showing more information than netstat and is actually faster. If you want a summary statistics you can use the command `ss -s`.
26. nmap
Nmap allows you to scan your server for open ports or detect which OS is being used. But you could also use this for SQL injection vulnerabilities, network discovery and other means related to penetration testing.
27. MTR
MTR combines the functionality of traceroute and the ping tool into a single network diagnostic tool. When using the tool it will limit the number hops individual packets has to travel while also listening to their expiry. It then repeats this every second.
28. Tcpdump
Tcpdump will output a description of the contents of the packet it just captured which matches the expression that you provided in the command. You can also save the this data for further analysis.
29. Justniffer
Justniffer is a tcp packet sniffer. You can choose whether you would like to collect low-level data or high-level data with this sniffer. It also allows you to generate logs in customizable way. You could for instance mimic the access log that apache has.
System related monitoring
30. nmon
nmon either outputs the data on screen or saves it in a comma separated file. You can display CPU, memory, network, filesystems, top processes. The data can also be added to a RRD database for further analysis.
31. conky
Conky monitors a plethora of different OS stats. It has support for IMAP and POP3 and even support for many popular music players! For the handy person you could extend it with your own scripts or programs using Lua.
32. Glances
Glances monitors your system and aims to present a maximum amount of information in a minimum amount of space. It has the capability to function in a client/server mode as well as monitoring remotely. It also has a web interface.
33. saidar
Saidar is a very small tool that gives you basic information about your system resources. It displays a full screen of the standard system resources. The emphasis for saidar is being as simple as possible.
34. RRDtool
RRDtool is a tool developed to handle round-robin databases or RRD. RRD aims to handle time-series data like CPU load, temperatures etc. This tool provides a way to extract RRD data in a graphical format.
35. monit
Monit has the capability of sending you alerts as well as restarting services if they run into trouble. It’s possible to perform any type of check you could write a script for with monit and it has a web user interface to ease your eyes.
36. Linux process explorer
Linux process explorer is akin to the activity monitor for OSX or the windows equivalent. It aims to be more usable than top or ps. You can view each process and see how much memory usage or CPU it uses.
37. df
df is an abbreviation for disk free and is pre-installed program in all unix systems used to display the amount of available disk space for filesystems which the user have access to.
38. discus
Discus is similar to df however it aims to improve df by making it prettier using fancy features as colors, graphs and smart formatting of numbers.
39. xosview
xosview is a classic system monitoring tool and it gives you a simple overview of all the different parts of the including IRQ.
40. Dstat
Dstat aims to be a replacement for vmstat, iostat, netstat and ifstat. It allows you to view all of your system resources in real-time. The data can then be exported into csv. Most importantly dstat allows for plugins and could thus be extended into areas not yet known to mankind.
41. Net-SNMP
SNMP is the protocol ‘simple network management protocol’ and the Net-SNMP tool suite helps you collect accurate information about your servers using this protocol.
42. incron
Incron allows you to monitor a directory tree and then take action on those changes. If you wanted to copy files to directory ‘b’ once new files appeared in directory ‘a’ that’s exactly what incron does.
43. monitorix
Monitorix is lightweight system monitoring tool. It helps you monitor a single machine and gives you a wealth of metrics. It also has a built-in HTTP server to view graphs and a reporting mechanism of all metrics.
44. vmstat
vmstat or virtual memory statistics is a small built-in tool that monitors and displays a summary about the memory in the machine.
45. uptime
This small command that quickly gives you information about how long the machine has been running, how many users currently are logged on and the system load average for the past 1, 5 and 15 minutes.
46. mpstat
mpstat is a built-in tool that monitors cpu usage. The most common command is using `mpstat -P ALL` which gives you the usage of all the cores. You can also get an interval update of the CPU usage.
47. pmap
pmap is a built-in tool that reports the memory map of a process. You can use this command to find out causes of memory bottlenecks.
48. ps
The ps command will give you an overview of all the current processes. You can easily select all processes using the command `ps -A`
49. sar
sar is a part of the sysstat package and helps you to collect, report and save different system metrics. With different commands it will give you CPU, memory and I/O usage among other things.
50. collectl
Similar to sar collectl collects performance metrics for your machine. By default it shows cpu, network and disk stats but it collects a lot more. The difference to sar is collectl is able to deal with times below 1 second, it can be fed into a plotting tool directly and collectl monitors processes more extensively.
51. iostat
iostat is also part of the sysstat package. This command is used for monitoring system input/output. The reports themselves can be used to change system configurations to better balance input/output load between hard drives in your machine.
52. free
This is a built-in command that displays the total amount of free and used physical memory on your machine. It also displays the buffers used by the kernel at that given moment.
53. /Proc file system
The proc file system gives you a peek into kernel statistics. From these statistics you can get detailed information about the different hardware devices on your machine. Take a look at the full list of the proc file statistics
54. GKrellM
GKrellm is a gui application that monitor the status of your hardware such CPU, main memory, hard disks, network interfaces and many other things. It can also monitor and launch a mail reader of your choice.
55. Gnome system monitor
Gnome system monitor is a basic system monitoring tool that has features looking at process dependencies from a tree view, kill or renice processes and graphs of all server metrics.
Log monitoring tools
56. GoAccess
GoAccess is a real-time web log analyzer which analyzes the access log from either apache, nginx or amazon cloudfront. It’s also possible to output the data into HTML, JSON or CSV. It will give you general statistics, top visitors, 404s, geolocation and many other things.
57. Logwatch
Logwatch is a log analysis system. It parses through your system’s logs and creates a report analyzing the areas that you specify. It can give you daily reports with short digests of the activities taking place on your machine.
58. Swatch
Much like Logwatch Swatch also monitors your logs, but instead of giving reports it watches for regular expression and notifies you via mail or the console when there is a match. It could be used for intruder detection for example.
59. MultiTail
MultiTail helps you monitor logfiles in multiple windows. You can merge two or more of these logfiles into one. It will also use colors to display the logfiles for easier reading with the help of regular expressions.
System tools
60. acct or psacct
acct or psacct (depending on if you use apt-get or yum) allows you to monitor all the commands a users executes inside the system including CPU and memory time. Once installed you get that summary with the command ‘sa’.
61. whowatch
Similar to acct this tool monitors users on your system and allows you to see in real time what commands and processes they are using. It gives you a tree structure of all the processes and so you can see exactly what’s happening.
62. strace
strace is used to diagnose, debug and monitor interactions between processes. The most common thing to do is making strace print a list of system calls made by the program which is useful if the program does not behave as expected.
63. DTrace
DTrace is the big brother of strace. It dynamically patches live running instructions with instrumentation code. This allows you to do in-depth performance analysis and troubleshooting. However, it’s not for the weak of heart as there is a 1200 book written on the topic.
64. webmin
Webmin is a web-based system administration tool. It removes the need to manually edit unix configuration files and lets you manage the system remotely if need be. It has a couple of monitoring modules that you can attach to it.
65. stat
Stat is a built-in tool for displaying status information of files and file systems. It will give you information such as when the file was modified, accessed or changed.
66. ifconfig
ifconfig is a built-in tool used to configure the network interfaces. Behind the scenes network monitor tools use ifconfig to set it into promiscuous mode to capture all packets. You can do it yourself with `ifconfig eth0 promisc` and return to normal mode with
`ifconfig eth0 -promisc`.67. ulimit
ulimit is a built-in tool that monitors system resources and keeps a limit so any of the monitored resources don’t go overboard. For instance making a fork bomb where a properly configured ulimit is in place would be totally fine.
68. cpulimit
CPUlimit is a small tool that monitors and then limits the CPU usage of a process. It’s particularly useful to make batch jobs not eat up too many CPU cycles.
69. lshw
lshw is a small built-in tool extract detailed information about the hardware configuration of the machine. It can output everything from CPU version and speed to mainboard configuration.
70. w
W is a built-in command that displays information about the users currently using the machine and their processes.
71. lsof
lsof is a built-in tool that gives you a list of all open files and network connections. From there you can narrow it down to files opened by processes, based on the process name, by a specific user or perhaps kill all processes that belongs to a specific user.
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