Linux

1. OpenVPN implements ssl vpn Based on Virtual TUN/TAP devices. Therefore, the kernel must support the TUN/TAP device module. This configuration option is in the 2.6.x kernel, in the Device Drivers-> Network device support menu, the full name is

Preface A few weeks ago, I had a computer, a Gigabit Z77-DS3H, and CentOS 6.4. It is depressing that this system does not support NIC with built-in points on the motherboard. No way, I have been alone for a long time, and finally I have solved it.

I am going to have a Linux I/O training in the company in the near future. I will sort out the relevant materials and share them with you. Position of various I/O monitoring tools in the Linux I/O Architecture From Linux Performance and Tuning

Iptables enterprise applications: , An experiment environment built using a virtual machine:1. the laptop (Internet users for short) simulates Internet users. in Linux, the intermediate server (GATEWAY) uses the iptables firewall as the Intranet

As a linux system administrator, the main task is to optimize system configuration so that applications can run in the optimal state on the system, however, due to the complexity and variability of hardware, software, and network environments, the

The chkconfig command is used to update (start or stop) and query the running level information of the system service. Remember that chkconfig does not automatically disable or activate a service immediately, but simply changes the symbolic

The sed command is easy to use for a single file. If you want to replace all the files in a specified folder, combine grep and sed into a command. The grep command can be used to search for the content of a single file or a file in a folder. The

The date command can get the current time. man shows that many parameters of date can be used, which is easy to format. For example: Date + "% F" output format: 2011-12-31date + "% F % H: % M: % S" output format: 2011-12-31 16:29:50 This is to

CentOS: [Root @ clovem ~] # Yum install telnet-server-y // install telnet server [root @ clovem ~] # Cat/etc/xinetd. d/telnet // enable The telnet hosting service # default: on # description: The telnet server serves telnet sessions; it uses \ #

CentOS download, LiveCD, netinstall, bin, and minimal are the following differences:Download centos system contains CentOS-6.3-x86_64-LiveCD.iso; CentOS-6.3-x86-netinstall.iso; CentOS-6.3-x86_64-bin-DVD.iso; CentOS-6.3-x86_64-minimal.iso. LiveCD is

Understand LVM Management in Linux: LVM is short for LogicalVolume Manager (logical volume management). It is a mechanism for managing disk partitions in Linux. It can be deployed on multiple physical volumes (PVs) create a virtual disk volume group

At work, some colleagues often complain that their English is not very good. Reading some error messages and configuration documents is not easy. Now I will set some major English documents to Chinese, we hope to help you in this process. 1. The

Today, I learned how to share files between liunx and window, which is easy to use. Mount the file and share the file. (The premise is that windows and liunx can ping each other) 1. Create a shared folder in window. 2. Create a shared folder on

Yesterday I forgot the password of the root user of the mysql database on a server. After searching and solving the problem, I learned that I could reset the root password as follows: 1. Stop the mysql Service # If there is a service, you

You may need to upgrade the Linux kernel for the following reasons. Try a new kernel moduleDevice Drivers require support from new kernel function modulesNew vulnerabilities have been detected in earlier versions of the kernel.The system often

1. Number of mysql PROCESSES IN THE SYSTEM Ps-ef | grep "mysql" | grep-v "grep" | wc-l 2. Slave_running Mysql> show status like 'slave _ running '; If the system has a slave server, this value indicates the slave server health. 3.

Ipv6 is not popular now, and it is almost useless. It should be completely disabled; otherwise, it will affect the actual application. For example, if you do not disable ipv6, you may use ipv6 to enable Google or even the ipv6 version, which is very

Open ports 80 and 3306 Vim/etc/sysconfig/iptables Add the following code under the rule of port 22 by default (you can continue to add and modify the port number) #/sbin/iptables-I input-p tcp -- dport 80-j ACCEPT #/sbin/iptables-I INPUT-p tcp --

In CentOS5, a method for achieving password-less communication between two-host rlogin and rsh is ========================== ================================== Author: cnhtm (http://cnhtm.itpub.net)Posted at: 2010.01.13Category: General

CentOS (Community ENTerprise Operating System) is one of the Linux releases. It is compiled from the source code that Red Hat Enterprise Linux releases according to open source code regulations. Because of the same source code, some servers that