Performance testing of open-source performance monitoring software

For system and network administrators, it is a heavy task to monitor and debug the performance of Linux systems on a daily basis. After 5 years working as an administrator in the IT field as a Linux system, I gradually realized how difficult it was to monitor and keep the system up and running. For this reason, we have written a list of the 18 most commonly used command-line tools that will help each Linux/unix system administrator work. These command-line tools can be used under a variety of Linux systems and can be used to monitor and find the cause of performance problems. This list of command-line tools provides enough tools to pick and choose the tools for your monitoring scenario.

1.top-linux Process Monitoring The top command under Linux is a performance Monitor that many system administrators often use to monitor Linux performance, and This command is available in many Linux or Unix-like operating systems. The top command is used to display all live processes that are running and active in a certain order, and the display results are updated periodically. This command shows CPU usage, memory usage, swap memory usage size, cache usage size, buffer usage size, process PID, commands used, and more. It can also show the memory and CPU usage of the running process. For system administrators, the top command is a very useful one that can be used to monitor the system and take the correct processing action when needed. Let's take a look at the top command in action. # Top Top Command Example For more examples of top commands, read the following 12 examples of using the top command in Linux.

2. vmstat– Virtual Memory Statistics The Linux VmStat command is used to display statistics for virtual memory, kernel threads, disks, system processes,I/O blocks, interrupts,CPU activity, and so on. By default, the Vmstat command is not available under the Linux system, and you need to install a Sysstat package that contains the Vmstat program . Common uses of the command format are: # vmstatprocs-----------memory-------------Swap-------io------System-------CPU-----r B swpd free< C12/>inact active si so bi bo in CS US sy ID WA St 1 0 0 810420 97380 70628 0 0 , 4 , 1 6, 3 0 For more vmstat examples, please read: 6 vmstat command instances under Linux

3.lsof-to list open files In many Linux or Unix-like systems, there are lsof commands, which are often used to display all open files and processes in the form of a list. Open files include disk files, network sockets, pipelines, devices, and processes. One of the main scenarios for using this command is when you cannot mount a disk and display an error message that you are using or opening a file. With this command, you can easily see which file is in use. The most common format for this command is as follows: # Lsofcommand PID USER FD TYPE DEVICE SIZE NODE nameinit 1 root CWD Dir 104,2 4096 2/init 1 root rtd DIR 104,2 4096 2/init 1 root txt reg 104,2 38652 17710339/sbin/initinit 1 root mem reg 104,2 129900 196453/lib/ld-2.5.soinit 1 root mem REG 104,2 1693812 196454/lib/libc-2.5.s Oinit 1 root mem REG 104,2 20668 196479/lib/libdl-2.5.soinit 1 root mem Reg 104,2 245376 196419/lib/libsepol.so.1init 1 root mem REG 104,2 93508 196431/lib/libselinux.so.1init 1 root 10u FIFO 0,17 953/dev/initctl For more information on the use and examples of LSOF commands, refer to the following 10 examples of using the lsof command in Linux.

4.tcpdump-Network Packet Analyzer Tcpdump is one of the most widely used network packet analyzers or packet monitoring programs that capture or filter TCP/IP packets that are received or transmitted on a specified interface on a network. It also has an option to save the captured package to a file for later analysis. In almost all major Linux releases, tcpdump can be used. # tcpdump-i Eth0tcpdump:verbose output suppressed, use-v OR-VV for full protocol decodelistening on eth0, Link-type EN 10MB (Ethernet), capture size bytes22:08:59.617628 IP tecmint.com.ssh > 115.113.134.3. Static-mumbai.vsnl.net.in.28472:p 2532133365:2532133481 ($) Ack 3561562349 win 964822:09:07.653466 IP Tecmint.com.ssh > 115.113.134.3.static-mumbai.vsnl.net.in.28472:p 116:232 ($) Ack 1 win 964822:08:59.617916 IP 115.113.134.3.static-mumbai.vsnl.net.in.28472 > Tecmint.com.ssh:. ACK-$ win 64347 For more information about tcpdump usage, see the following 12 examples of using the Tcpdump command in Linux.

5.netstat-Network Status statistics Netstat is a command- line tool for monitoring packet and network interface statistics for incoming and outgoing networks. It is a very useful tool that system administrators can use to monitor network performance, locate and troubleshoot network-related issues. # Netstat-a | Moreactive Internet connections (servers and established) Proto recv-q send-q Local address Foreign Address STATETCP 0 0 *:mysql *:* listentcp 0 0 *:su NRPC *:* listentcp 0 0 *:REALM-RUSD *:* LISTENTCP 0 0 *:ftp *:* listentcp 0 0 Lo Calhost.localdomain:ipp *:* listentcp 0 0 localhost.localdomain:smtp *:* Listentcp 0 0 localhost.localdomain:smtp localhost.localdomain:42709 time_waittcp 0 0 localhost.localdomain:smtp localhost.localdomain:42710 time_waittcp 0 0 *:http *:* LISTENTCP 0 0 *:ssh *:* listentcp 0 0 *: HTTPS *:* LISTEN For more examples of Netstat, see:  linux Under 20 examples using netstat commands.

6. Htop–linux process monitoring   htop  is a very advanced interactive real-time Linux process monitoring tool. It is very similar to the top command, but it has richer features such as user-friendly management of processes, shortcut keys, vertical and horizontal display of processes, and so on. Htop is a third-party tool that is not included in a Linux system and you need to use the Yum Package management tool to install it. For more information on installation, please read the following. # Htop htop Command example

7.iotop-Monitoring Linux disk I/O The Iotop command is also very similar to the top command and the htop program, but it has the ability to monitor and display real-time disk I/O and process statistics. This tool is useful when you are looking for specific processes and lots of disk read and write processes. # Iotop Examples of IOTOP commands For information on how to install and use Iotop, please read: Install Iotop under Linux. 8.iostat-Input/Output statistics iostat is a simple tool for collecting display system storage devices input and output status statistics. This tool is often used to track performance issues with storage devices, including devices, local disks, and remote disks such as NFS. # Iostatlinux 2.6.18-238.9.1.el5 (tecmint.com) 09/13/2012avg-cpu: %user %nice%system%iowait % Steal %idle 2.60 3.65 1.04 4.29 0.00 88.42Device: TPS blk_read/s BLK_WRTN/S blk_read blk_wrtncciss/c0d0 17.79 545.80 256.52 855159769 401914750CCISS/C0D0P1 0.00 0.00 0.00 5459 3518cciss/c0d0p2 16.45 533.97 245.18 836631746 384153384cciss/c0d0p3 0.63 5.58 3.97 8737650 6215544CCISS/C0D0P4 0.00 0.00 0.00 8 0cciss/c0d0p5 0.63 3.79 5.03 5936778 7882528cciss/c0d0p6 0.08 2.46 2.34 3847771 3659776 For more information on iostat usage and examples, please visit the following 6 examples of Linux using the Iostat command.

linux console runs, Open source real-time network ( LAN) monitoring applications. It collects a lot of information, such as IP traffic monitoring over the network, including TCP tokens, ICMP details, TCP/UDP traffic separation, TCP connection packets, and bytes. It also collects common information and details about the state of the interface: TCP, UDP, IP, ICMP, non-IP,IP checksum error, interface activity, and so on.

PSACCT or Acct tools are used to monitor the activity status of each user in the system. These two service processes run in the background, and they are closely monitored for all activities of each user running on the system, while also monitoring the resources used by these activities. system administrators can use these two tools to track each user's activity , such as what users are doing, how many resources they use, how long they have been on the system, and so on.

monit is a free open source software and a web-based process monitoring tool. It can automatically monitor and manage system processes, programs, files, folders, permissions, sum verification codes and file systems. monit Linux system monitoring

nethogs:linux

iftop is another open source system monitoring application running in the console that shows the list of network bandwidth usage (source host or destination host) of the application over the network interface on the system. This list is updated regularly. Iftop is used to monitor the use of the network, while top "tool family, which monitors the selected interface and displays the current network bandwidth usage among the two hosts. iftop-monitors network bandwidth. For more information, see: iftop-Monitoring the usage of network bandwidth.

monitorix-System and Network monitoring Monitorix is a free lightweight application tool designed to run and monitor Linux/unix server systems and resources. It has an HTTP Web server that has a regular collection of information about the system and the network and displays it graphically. It monitors the average load and usage of the system, memory allocations, disk health, system services, network ports, message statistics (SENDMAIL,POSTFIX,DOVECOT, etc.), MySQL statistics, and so on. It is used to monitor the overall performance of the system to help detect errors, bottlenecks, and abnormal activity.

arpwatch– Ethernet Activity Monitor The Arpwatch is designed to monitor Ethernet address resolution (changes inmac and IP addresses) on Linux. He continuously monitors Ethernet activity for a period of time and outputs a log of changes in IP and MAC address pairs. It can also send an email notification to an administrator, alerting you to an increase in address pairing. This is useful for detecting ARP attacks on a network. For more information, see: Arpwatch to Monitor Ethernet Activity suricata– Network Security Monitoring Suricata is an open source high-performance network security, intrusion detection and anti-monitoring tool that can run on Linux, FreeBSD, and Windows. Nonprofit organization OISF (Open Information Security Foundation) develops and owns its copyrights. For more information, see: Suricata–a Network intrusion Detection and prevention System

Vnstat php– Network traffic monitoring

Vnstat PHP is a web-based front-end rendering of popular web Tools "Vnstat". Vnstat PHP presents the network usage in a beautiful graphical interface. He can display upload and download traffic in hours, days, months, and output summary reports.

For more information, see: Vnstat php–monitoring Network Bandwidth

nagios– Network/server monitoring

Nagios is a leading and powerful open source monitoring system that allows network/system administrators to identify and resolve problems before they affect normal business. With the Nagios system, administrators can remotely detect Linux, Windows, switches, routers, and printers within a single window. It can warn of danger and indicate whether there is an exception to the system/server, which can indirectly help you to take rescue measures before the problem occurs.

Performance testing of open-source performance monitoring software