linux network monitoring commands

/local/mongodb/log/mongodb.logmongod 9313 iotweb 8uW REG 252,0 5 778246 /opt/local/mongodb/data/mongod.lockmongod 9313 iotweb 9uw REG 252,0 21 778247 /opt/local/mongodb/data/WiredTiger.lockmongod 9313 iotweb 15u REG 252,0 36864 778253 /opt/local/mongodb/data/sizeStorer.wtIndicator description Indicators Description COMMAND The name of the process Pid Process ID USER Proce

Linux performance testing and monitoring sar commands Sar (System Activity Reporter System Activity Report) is one of the most comprehensive System performance analysis tools on Linux. It can report System activities from multiple parties, including: file read/write, system call usage, disk I/O, CPU efficiency, memory

About NagiosNagios is an open source computer system and network monitoring tool that can effectively monitor Windows, Linux and UNIX host status, switch routers and other network settings, printers, etc. Send mail or SMS alarm when the system or service status is abnormal the first time to notify the site operators, a

1. Lsof Command IntroductionLsof (list open files) is a tool that lists open files for the current system. In a Linux environment, everything is in the form of files, with files that not only access regular data, but also access to network connectivity and hardware. So, such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) sockets, the system assigns a file descriptor to the applicati

Wireshark (below we will introduce).TopThe top command displays the current active process, which, by default, is sorted by the severity of the CPU consumed, refreshes the list every 5 seconds, and you can choose a different sort method, for example, M is a shortcut key to sort by memory footprint.UptimeThe uptime command tells you how long this server has been running since booting up to the present time. It also contains the average load from boot to current server.VmstatYou can use Vmstat to

) ├─{MYSQLD} (24689) ├─{mysqld} (27329) └─{MYSQLD} (27331)[10-sar]The SAR command is a Swiss Army knife in the system monitoring tool.The SAR command is actually comprised of three programs, the SAR (for displaying data), SA1 (for collecting data), and SA2 (for storing data).The SAR can cover CPU utilization information, memory paging information, network IO transmission informat

the syntax in the following format:Traceroute website(9) NetstatThe netstat command is used to display network-related information , where the path is/bin/netstat, with the syntax in the following format:netstat [options]where the-t option represents the TCP protocol, the-U option represents the UDP protocol,-L for listening,-R for routing, and-n for displaying the IP address and port number .such as: view the local listening port-----netstat-tlunVie

) ├─{MYSQLD} (24689) ├─{MYSQLD} (27329) └─{MYSQLD} (27331) [10-sar]The SAR command is a Swiss Army knife in the system monitoring tool.The SAR command is actually comprised of three programs, the SAR (for displaying data), SA1 (for collecting data), and SA2 (for storing data).The SAR can cover CPU utilization information, memory paging information, network IO transmission information, process creatio

Network Communication commands (relatively simple ): 1. write/usr/bin/write Write [user name] Used to send information to a user, provided that the user has logged on to the server host Otherwise, there is no way to leave a message for him. Therefore, write is a real-time communication tool. End the communication with Ctrl + D E.g. write guest 2. wall [write all]/usr/bin/wall Used to broadcast information t

tools capture separate packages on the link, analyze their content, and display decoded content or packet-level statistics. These tools monitor and manage the network at the lowest level, as well as the most granular monitoring, at the expense of the process of affecting network I/O and analysis.Dhcpdump: A command-line DHCP traffic sniffing tool that captures D

Network Communication commands (relatively simple): 1. writeusrbinwritewrite [user name] is used to send information to the user, provided that the user has logged on to the server host, otherwise, therefore, write is a real-time communication tool Network Communication commands (relatively simple ): 1. write/usr/bin/w

information. For example, the free command on Oschina performs the result: Mpstat Mpstat Mpstat is an abbreviation of multiprocessor statistics, a real-time system monitoring tool. Some statistical information about the report and CPU, which is stored in the/proc/stat file. In a CPUs system, it is not only possible to view the average information of all CPUs, but also to view information about a particular CPU. Let's look at the results of the M

Network communication commands1. Send a message to a user: write Command name: Write English Original: command path:/usr/bin/write Execute permissions: All user syntax: Wirte 2. Send broadcast message to all users: Wall Command name: Wall English Original: Write all command path:/usr/bin/wall Execute permissions: All user syntax: Wirte 3. Test network connectivity: Ping Command name: Ping English Original