Linux

Introduction of Epoll Series functions #include int epoll_create (int size); int epoll_create1 (int flags); int epoll_ctl (int epfd, int op, int fd, struct epoll_event *event); int epoll_wait (int epfd, struct epoll_event *events, int

First, Message Queuing 1. Message Queuing provides a way to send a piece of data from one process to another 2. Each block of data is considered to have a type, and the receiver process receives a data block that can have a different type value 3.

Linux Open File number too many open files solution Too many open files is prompted because the number of file/socket connections that the program opens exceeds the system setting. To view the maximum allowable number of open files per user The

The Linux kernel provides a mechanism for accessing kernel internal data structures and changing kernel settings through the/proc file system at run time. Although the basic concepts of the/proc file system for Linux systems on various hardware

One, install POSTFIX,CYRUS-SASL,CYRUS-IMAPD If the YUM hint cannot find the package, please change the source, please refer to CentOS 6 recommended to use Epel source The code is as follows: [Root@localhost ~]# Yum install postfix

I've been using Linux for 10 years, and I'm going to show you a series of commands, tools, and techniques from the beginning, and I hope someone tells me that from the start, not the way I've been growing. 1. command line daily system

  Linux is the most commonly used operating system in server operating systems because of its high performance, high scalability, and high security, which has been sought after by more and more operators. But there are also a lot of security

. tar Unpack: Tar xvf Filename.tar Packing: Tar cvf filename.tar dirname (Note: Tar is packed, not compressed!) ——————————————— . gz Decompression 1:gunzip filename.gz Decompression 2:gzip-d filename.gz Compression: gzip FileName . tar.gz

As we all know, Linux does not catch up with Windows popularity and ease of use on desktop applications, but it is precisely because of its seemingly troublesome command-line operations that make it more secure than Windows, which uses a graphical

Snmp,simple Network Management Protocol: A Simple Network management protocol, which is a standard protocol for managing nodes on an IP network. The basic function of SNMP is to obtain, set up and receive unexpected information sent by the agent.

Reset Password after Linux MariaDB forgotten passwordMariaDB is a branch database of MySQL. The approach is the same as MySQL.Modify the MySQL configuration fileAppend the configuration entry in [MYSQLD]:[[email protected] ~]# vim /etc/my.cnf[[email 

Access to the character device is done through the device name in the file system. Those device names are simply nodes that are called file system trees, and they are typically located in the/dev folder.Device files for character device drivers can

In addition to having system-default monitoring items, SNMP provides a powerful feature to customize monitoring items.The EXEC option in the snmpd.conf configuration file (in the higher version of SNMP, extend instead of exec) provides a custom

Reference website: http://www.wdlinux.cn/wdcp/install.htmlWDCP supports two mounting methods1 source code compiling this installation is cumbersome and time-consuming, typically between 20 minutes and one hours, depending on the configuration of the

Introduction to Basic Network configuration method of Linux networkNetwork Information viewSet Network address:1You will see:1 device=eth02 bootproto=statics3 hwaddr=xx: 0C:£ º - :D 1:6f 4 onboot=Yes5 type=Ethernet6 ipaddr=192.168. 0.212 7 netmask=2

I. BACKGROUNDSystem administrators often require SSH or telent telnet to a Linux server and often run tasks that take a long time to complete, such as system backups, FTP transfers, and so on. Usually we open a remote terminal window for each of

Install python scientific computing library on centos 70. Build a Python Development Environment (vimplus) in a Linux environment 0.1 preparations Install CentOS7 and configure the network to ensure smooth network connection.0.2root

Add open ports to CentOS firewallAdd firewall-cmd --zone=public --add-port=80/tcp --permanent (-Permanent takes effect permanently. If this parameter is not set, it will become invalid after restart)Reload firewall-cmd --reloadView firewall-cmd -

Ssh certificate verification login, ssh certificate verification Generally, PuTTY and other SSH clients are used to remotely manage Linux servers. However, a common Password Logon method is prone to brute force password cracking. Therefore, we

Troubleshoot CentOS7.0 networking and centos7.0 networking 1. ifconfig command. Check whether the network configuration is correct. Configure the network in/etc/sysconfig/network-scripts/ifcfg-ens32, remember the onboot = on option must be set,