Linux

I. BACKGROUNDSystem administrators often need SSH or telent to telnet to a Linux server, often running tasks that take a long time to complete, such as system backup, FTP transfer, and so on. Typically, we open a remote terminal window for each of

To Linode VPS CentOS 6.4 iptables Add a rule that limits the number of IP connections to no more than 100:Iptables-a input-p TCP--syn--dport 80-m connlimit--connlimit-above 100-j REJECT Error occurred: Iptables:protocol wrong type for socket.

Solution: Method One: Change the directory or file's policy type to httpd_sys_content_t.# chcon-r-h-t httpd_sys_content_t/www/web/You can then use the Ls-laz command to view the policy type of the file directory. Method Two: Disable SELinuxLinux

Task Manager under Windows is not good (individuals prefer process Explorer some), but also convenient, can easily view the process, CPU, memory ... And it's easy to end the process. There is no GUI Linux, there are commands to implement Windows

Wen/Yu Tao　　As a Linux program developers, we must have encountered makefile, using make command to compile their own written program is indeed very convenient. In general, everyone is writing a simple makefile, if you want to write a free software

This chapter explains how Linux systems keeps time and what needs to be done to avoid problems. Usually, you don't have to do anything about time, but it's better to understand it. Time Time measurement is based on the most regular natural

On the internet to see a lot about Linux optimization of good articles, here I do not repeat these articles, I just want to from my own experience to talk about this aspect of the problem. As a system administrator, I'm talking about Linux based on

I. Environmental description The server of the unit uses Redhat Linux 9.0, the mail server uses SendMail 8.12.8; This server is placed in the intranet, through a Win2000 server as a gateway, connected to the Internet; The Gateway software uses

Introduction to Linux environment variables Environment variables: The bash shell uses an attribute called "Environment variable (environment variables)" To store information about the shell session and the working environment, which allows you to

Linux vsftpd Compile installation and configuration allows local users to log on to FTP 1, download vsftpd source wget https://security.appspot.com/downloads/vsftpd-2.3.4.tar.gz 2, compile vsftpd source codeThe cp/lib64/libcap.so.1/lib/libcap.so.1

The UNIX system records these three different times for each file, the first one is mtime, that is, the modification time. Whenever the contents of a file are changed, the value of the Mtime is modified accordingly. The second one is Atime, which is

Semaphore, sync these nouns have been said in the process of communication, where they mean the same, except that the synchronized objects are different. However, the interface of the semaphore described below is used for the semaphore of the thread,

By step: Operating Environment Centeros 6 * First run the following command: cat /dev/net/tun The return must be:Cat:/dev/net/tun:file Descriptor inRun:cat /dev/pppThe return must be:Cat:/dev/ppp:no such device or address If the above return is

Linux to open URL rewriting method:1, open Apache httpd.conf (usually in the/etc/httpd/conf directory) 2, find #LoadModule rewrite_module modules/mod_rewrite.so Remove the front of the # 3, to find allowoverride None changed to allowoverride all,

Some Linux distributions provide GUI programs for system monitoring, such as SUSE Linux has a great and professional tool yast,kde the KDE System Guard is also excellent. Of course, to use these tools, you have to operate in front of the server, and

Linux mount U disk steps are as follows 1: The USB disk plug into the interface, check whether inserted good 2: Check partition and USB device information with fdisk command [Root@wgods ~]# Fdisk-l disk/dev/sda:1000.2 GB, 1000204886016 bytes255

If you're using a Linux operating system, you'll want to know how to save and recover data once the hard drive crashes. In fact, there are many Linux data recovery tools that can help us get rid of data security problems. I have prepared some of the

1.ctrl+a: Skip to command line ctrl+e: Skip to command End ctrl+l: Clear Screen2. Switch User Su-user name3. Replace the Yum image source1. Go to/ETC/YUM.REPOS.D backup Centos-base.repo2.http://mirrors.163.com/Select CentOS Download Centos6-base-163.

The normal mount disk under Linux is fdisk, but Fdisk does not support GPT partition (MBR partition table only supports 2T disk), so the disk to be mounted is larger than 2T to use parted for GPT disk operation!Parted function is very powerful, both

The grep command is used to find files whose content contains the specified template style. If the content of a file conforms to the specified template style, the default grep command displays the column containing the template style. If no file