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If you are a Linux system administrator, there is no doubt that you have to spend a lot of time working on the command line: Installing and uninstalling software, monitoring system status, copying, moving, deleting files, checking errors, and so on. Most of the time you enter a command and wait a long time until the execution is complete. There are times when you execute a command that hangs, and you can on
The watch command can help you monitor the running results of a command, saving you the need to manually run it over and over again. In Linux, watch periodically runs the next program and displays the execution result in full screen.
Watch is a very practical command. basically all Linux distributions have this tool. like a name, watch can help you monitor the running results of a command, saving you the ne
Job One:1) Add a 15G SCSI hard disk before opening the Linux system2) Turn on the system, right click on the desktop, open the terminal3) for the newly added hard disk partition, a primary partition size of 5G, the remaining space to the extended partition, on the extended partition divided 1 logical partitions, the size of 5GTo set the primary partition:To set an extended partition:To set the extension partition logical partition:To view partition re
UptimeSystem time, run time, number of connections (no terminal counts a connection), system load within 1, 5, 15 minutesVmstat 1 3 Monitoring System CPU memory, sampling once a second, sampling four timesPidstat commandA. Need to install Yum install SysstatB.pidstat-p 2962-u 1 3 monitoring 2962 threads, sampling three times per secondC.pidstat-p 2962-T Thread Process informationSeveral
Do you want to know what your server is doing? You need to know the basic commands described in this article. Once you are familiar with these commands, it lays the foundation for becoming a professional Linux system administrator.
You can use a graphical user interface (GUI) program to obtain a large amount of information provided by these shell
?" Enable all warning options unless there is an excellent reason for not doing so.
10. lint
At first, lint was used to check unportable code in C language, but now it is not just a portability check program, you can also check out the features in the code that are portable and fully compliant with the syntax but are likely to be incorrect.
Lint has many versions. in Linux, splint can be used for installation through apt-get.
Integrated debugging: gd
I. Description of the OrderThe free command displays the usage of system memory: physical memory, swap memory (swap), and kernel buffer memorySecond, parameter description
-b-k-m-g: Display memory usage in bytes, KB, MB, GB, respectively
-L: Displays detailed low memory and high memory statistics
-O: Do not show-/+ Buffers/cache this line
-T: Show memory sum, Ram+swap
-S: Allows uninterrupted monitoring of memory usage over a
1.load AverageTopUptime2.CPU UtilizationTop1 Multi-core CPU viewShift+h using threads to view-p Specifies the process to viewTop | grep Cpu3. Disk space remainingDf-H output by unit formatDu-H output by unit format4. Network trafficSar-n DEV 1 1-N Reporting Network statusDEV View network traffic for each network cardN
1. Network Configuration/etc/sysconfig/net-script/ifcfg-*DEVICE: Interface NameUUID: Device Unique indicationHWADDR: Network card AddressOnboot: Does the boot startBootproto:static|none|dhcpType:ethernet| BridgeDns1:dns AddressPeerdns: If the DNS address is automatically assigned to DHCP mode, override manualIpaddr:ip AddressNETMASK: Subnet MaskGateway: Gateways Address2. Common
The Linux Performance Network monitoring tool (IOSTAT/SAR/MPSTAT) needs to be installed Sysstat this package.Tool One, iftop (View network bandwidth, (must be installed from Epel source)1) The dependency packages required by Iftop are as follows:Flex BYACC libpcap ncurses ncurses-devel libpcap-devel2) The following is
the system. But Pidstat appears to be in some newer versions of the 2.6 kernel, and needs to install the Sysstat package.Under Ubuntu, you can install it via the sudo apt-get install Sysstat.SAR commandCommand: Sar-x PID 1 1000SAR can also specify the corresponding PID, focus on a fixed number of parameters, not pidstat so powerful. I can't see the corresponding I/O, IR and other information.The functions of the SAR can be covered by Mpstat, iostat and related functions.Dstat commandCommand: ds
about the CPU, which is stored in the/proc/stat file.7 FreeThe free command displays the idle, used physical memory and swap memory in the Linux system, and the buffer used by the kernel.8 StraceStrace is commonly used to track system calls and received signals when a process executes.9 tcpdumpTcpdump, is: The dump the traffic on a network, according to the user's definition of the packet interception of p
In a class Linux system, you can use top to view information such as system resources, processes, memory consumption, and so on. View network status You can use Netstat, nmap and other tools. To see real-time network traffic, monitor TCP/IP connectivity, and so on, you can use Iftop.First, Iftop What is it? The iftop is a real-time traffic
Iftop is mainly used to show the local network traffic and the flow of communication between each other, such as the size of the flow between the individual and that machine, is very suitable for proxy server and iptables server use to view network status can use Netstat, nmap and other tools. To view real-time network traffic, monitor TCP/IP connections, and so
network failure forensics processing, because of the confidentiality issues involved, all the logs have been technical processing.Due to the tight time, limited capacity, the book is unavoidable, but also please readers to my blog a lot of mistakes.3. The experimental environment of this bookThe UNIX platform selected for this book is primarily Red Hat and Debian Linux for the Solaris and Freebsd,
Network monitoring is the most complex in all Linux subsystems, with too many factors, such as latency, blocking, conflict, and packet loss, even worse, the routers, switches, and wireless signals connected to Linux hosts all affect the overall network and it is difficult to
the percentage of CPU, the higher the ratio, the more saturated the description
When the value of 1.avgqu-sz is low, the equipment utilization is higher
2. When the value of%util is close to 1%, it indicates that the device bandwidth is already full
Iv. Performance Analysis HelpTo determine the system bottleneck, it is sometimes necessary to combine several SAR command options:1, suspected CPU bottleneck, you can use Sar–u and sar–q to view2. Suspected memory bottleneck, can use Sa
current timePeak: Traffic PeaksRates: Represents the average traffic for the past 2s 10s 40s, respectively5.4. Related parametersCommon parameters-I set the monitoring network card, such as: # Iftop-i eth1-B displays traffic in bytes (default is bits), such as: # Iftop-b-N Causes the host information to display IP directly by default, such as: # Iftop-n-N causes port information to be displayed by default
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