Category：Linux
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Time：2020-4-6
Detailed configuration of sudo and its configuration file / etc / sudoers under Linux 1.sudo introduction Sudo is a common tool under Linux that allows ordinary users to use super user rights. It allows system administrators to let ordinary users execute some or all root commands, such as halt, reboot, Su, and so on. This […]
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Time：2020-4-6
Rename is used for file naming management, batch naming and regular expression support. There are two versions of rename command, one is the C language version which supports wildcards, the other is the Perl version which supports regular expressions Command format:Usage: rename [-v] [-n] [-f] perlexpr [filenames] Parameter Description:V show details of file renameN do […]
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Time：2020-4-6
I. uptime The display results of the uptime command include how long the server has been running, how many users have logged in, and the overall evaluation of the server performance (load average). The load average value records the load of the last 1 minute, 5 minute and 15 minute intervals respectively. Load average is […]
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Time：2020-4-6
When this error occurs, most of the projects you compile are 32-bit projects generated on 64 bit machines. You need to install the corresponding GCC 32-bit libraries. At this time, check that GCC must have – M32; Your system does not have the multilib library installed in GCC; you can use this library to generate […]
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Time：2020-4-5
Detailed explanation of sudo network permission under Linux For the server with network agent set, there is no problem in executing network access under the current user, but when executing the command through sudo, there will be an error of “no network connection”. background For the server with network agent set, there is no problem […]
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Time：2020-4-5
ps PS [- aacdefhjlmnvwy] [acefghlnrsstuvxx] [- C < instruction name >] [- G < group name >] [- G < group ID >] [- P < process ID >] [- s < phase job >] [- T < terminal number >] [T < terminal number >] [- U < user ID code >] [- U […]
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Time：2020-4-5
Today, in a project, there is a failure: during the stress test of OA system based on Weblogic, the number of concurrent connections is very small (much lower than the normal number). The system uses the red flag version of DC 4.1 for Itanium 2, and uses Apache for web service forwarding. Later, after a […]
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Time：2020-4-5
SELinux concept The security module of mandatory access control developed jointly by NSA and SCC. Open source with GPL in 2000, Linux 2.6 kernel is integrated in the kernel. When SELinux is not enabled, the access mode is DAC (discrete access control) free access control The resources that a process can access in DAC mode […]
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Time：2020-4-4
File descriptors and file pointers under Linux Document identifier: First let’s look at what a file identifier is? File descriptor is a term in computer science. It is an abstract concept used to express references that only want files. In Linux, each process will save a file descriptor table in the process control block (PCB). […]
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Time：2020-4-4
PS command in Linux is the abbreviation of process status. The PS command can list the currently running processes in the system, and the listed processes are the running processes at the moment when the PS command is executed.If you want to display process information dynamically, you need to use the top command. Through the […]
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Time：2020-4-4
Hard disk is a loss of equipment, when used for a period of time may appear bad track and other physical failures. If the computer hard disk is not replaced in time or handled technically, more and more bad paths will occur, which will cause frequent crashes and data loss. The best way to deal […]
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Time：2020-4-4
1、 The difference in principle between four layer and seven layer load balancing 1. Icon 2. overview Four layers of load balancing work in four layers of OSI model, namely the transport layer. Four layer load balancing can only forward the request according to the target address and source address in the message, but can’t […]
