loadavg

The at command allows you to specify a specific date and time to run a program. For example, I can start playing music on my CDROM at seven o'clock every morning:   At 7: 00 Cdplay   In the preceding example, enter "at" in the command line

Linux tmux Study Notes tmux is known as a substitute for screen. Let's see why: it supports pasting/copying between multiple windows, and you can choose to paste the buffer zone, which is not supported by screen. The split screen operation wins.

CentOS system performance monitoring Linux provides a very good file Virtual System (/proc) to monitor system performance. The/proc file virtual system is a mechanism used by the kernel and kernel module to send information to processes. It exists

Linux provides a very good file Virtual System (/proc) to monitor system performance. The/proc file virtual system is a mechanism used by the kernel and kernel module to send information to processes. It exists in the memory instead of the hard disk.

Monit is a monitoring software that provides rich functions for processes, files, directories, and devices. It is used on UNIX platforms. It can automatically fix stopped programs and is suitable for the Special Envoy to handle software errors

Python Gets the host IP address#!/usr/bin/env python#coding:utf-8import osip=os.popen ("Ifconfig eth0|grep ' inet addr ' |awk-f ': ' {print $} ' |awk ' { Print "") for I in Ip:print "IP address is:%s"% (I.strip ()) #ip =ip.read (). Strip () #print

1./proc DirectoryThe Linux kernel provides a mechanism for accessing kernel internal data structures and changing kernel settings at run time through the/proc file system. The proc file system is a pseudo-file system that only exists in memory and

#!/usr/bin/python# coding:utf-8import osimport jsonimport socketimport psutilclass  host:    _hostname = socket.getfqdn (Socket.gethostname ())       @classmethod     def get_local_addr (CLS):         addr = socket.gethostbyname (Cls._hostname)      

Here to monitor memory usage as an example, write a simple demo program, the specific operation according to the 51reboot tutorials written below. First, the establishment of a database to build tables To create a Falcon database: Mysql> CREATE

First, CPU information collection 1). Collect CPU Usage rate Acquisition algorithm: collecting and calculating CPU total utilization or single kernel utilization through/proc/stat file. Taking cpu0 as an example, the algorithm is as follows:1. Cat/

Monitoring is the core task of cluster management. Monitoring data can be used for scheduling tasks, load balancing, reporting hardware and software failures to administrators, and extensive control of system usage. Monitoring information must be

Introduction to Linux Namespace We often hear that Docker is a virtualization tool that uses Linux Namespace and cgroups, but what is Linux Namespace how it is used in Docker, where many people are confused, Let's begin by introducing the Linux

IntroducedThe open source monitoring system, OPENTSDB, uses HBase to store all the timings (without sampling) to build a distributed, scalable time-series database . It supports the second-level data acquisition of all metrics, supports permanent

1./the proc directory Linux kernel provides a/The proc file system, which accesses kernel internal data structures at run time, and changes the kernel setting mechanism. The proc file system is a pseudo-file system that only exists in memory and

To reference the original shell script:#/bin/bashload=$ (awk ' {print '} '/proc/loadavg)cpunum=$ (grep-c processor/proc/cpuinfo)If [$ (echo $LOAD > $CPUNUM "| bc) = 1]; Thenresult=$ (Ps-eo Pcpu,pmem,user,args | awk ' $ > 0 ' | sort-nr)If [-N

1./proc DirectoryThe Linux kernel provides a mechanism for accessing kernel internal data structures and changing kernel settings at run time through the/proc file system. The proc file system is a pseudo-file system that only exists in memory and

CPU Information Acquisition CPU UsageAcquisition algorithmCollect and calculate total CPU usage or single core utilization with/proc/stat files. Take cpu0 as an example, the algorithm is as follows:1. Cat/proc/stat | grep ' cpu0 ' gets cpu0 's

1./proc DirectoryThe Linux kernel provides a mechanism for accessing kernel internal data structures and changing kernel settings at run time through the/proc file system. The proc file system is a pseudo-file system that only exists in memory and

Cpu usage Collection AlgorithmCollect and calculate the total CPU usage or single-core usage using the/proc/stat file. Taking cpu0 as an example, the algorithm is as follows:1. cat/proc/stat | grep 'cpu0' to obtain cpu0 Information2. cpuTotal1 =

When a Linux system encounters a problem, we not only need to view the system log information, but also need to use a large number of performance monitoring tools to determine which part (memory, CPU, hard disk ......) An error occurred. In Linux,