Linux

Server configuration, specific IP, master and slave libraries as follows Main Library ip:192.168.1.189 master server from library ip:192.168.1.188 slave server The server system is: centos5.6, download the installation package specifically includes

MySQL database supports the master-slave replication function of the database, so in the cluster has its unique advantages, the domestic and foreign large-scale Web site architecture system, has adopted the MySQL master-slave database configuration

1 minimized installation (custom package: most basic: Bash; Compatibillty librarles;debugging tools;development Tools)Minimize Startup:For Oldboy in ' Chkconfig--list | grep "3:on" |awk ' {print $} ' | Grep-ve "crond|network|sshd|rsyslog|xinetd" ';d

-Root, which holds the files of the root user-Home, storing relevant files for ordinary users-Bin, a directory of commonly used commands, such as Vi,su-Sbin, you must have permission to use the command-MNT, default mount directory for CD-ROM and

Xdebug IntroductionXdebug is an open source PHP program debugger (a debug tool) that can be used to track, debug, and analyze the health of PHP programs.Xdebug InstallationFirst let PHP error display, only need to modify the php.ini of the 2

First, preface     SECURECRT is my favorite, and very useful remote connection tool, the daily work is basically inseparable from it. It is a pity that I have been searching for SSH remote terminal management software like SECURECRT under Linux.

Today to see the alarm server alarm, found/var/log/messages file size of 3.9GB, to save space to decide to empty the messages file. Because this file cannot be deleted directly, consider using the following commandecho "" >/var/log/messages result

Heap heap allocation at the user level: malloc function for heap memory allocationvoid malloc (size_t size); Virtual memory address layout for the process:For users, the primary focus is on user space. After you enlarge the user space,

Linux under compression command (reprint) . Tar unpack: Tar xvf filename.tar pack: Tar cvf filename.tar DirName (Note: Tar is packaged, not compressed!) ) ———————————————. GZ decompression 1:gunzip filename.gz decompression 2:gzip-d filename.gz

[[Email protected] ~]#yum-y Install wget (Note: Download the wget command and install it)Could not retrieve Mirrorlist http://Mirrorlist.centos.org/?release=5&arch=i386&repo=os Error was[Errno 4] IOError: Error: Cannot retrieve repository metadata

Show all Routes now#route[Email protected] ubuntu:~# RouteKernel IP Routing TableDestination Gateway genmask Flags Metric Ref use Iface10.147.9.0 * 255.255.255.0 U 1 0 0 eth0192.168.1.0 * 255.255.255.0 U 2 0 0 Wlan0192.168.122.0 * 255.255.255.0 U 0 0

The "fragmentation" in kernel terminology is generally based on physical memory, and I'm not too sure that you can conclude that fragmentation is the logic of the conclusion of address space. But I think, since you know that malloc is a user space

After installing in the virtual machine, want to copy software to the virtual machine when the connection with Xmanager FTP connection is not connected to the problem, the solution is as follows:1, modify the Sshd_config file, the command is: vi/etc/

One: CPU[Email protected]/]# More/proc/cpuinfo | grep "model name"Model Name:intel (R) Xeon (r) CPU X3220 @ 2.40GHzModel Name:intel (R) Xeon (r) CPU X3220 @ 2.40GHzModel Name:intel (R) Xeon (r) CPU X3220 @ 2.40GHzModel Name:intel (R) Xeon (r) CPU X32

Copy Directory command: CP needs to replicate directory-r destination directory (note with parameter-R)Compressed files: Zip-r compressed file name after compression of the directoryTest.zip is compressed after the file test is a compressed folder

Linux text mode to listen to mouse events, here is done by the GPM, the code is as follows:1#include 2#include 3#include 4#include 5 6 voidMainintargcChar**argv)7 { 8 fd_set Readset;9Gpm_eventEvent; Ten Gpm_connect Conn; One AConn.eventmask = ~0; -

1. In the Linux 0.11\linux\kernel\exit.c file, either the Send_sig () function or the kill_session () function, the place where the signal is sent is direct (*p)->signal |= 1 What I do not understand is: why the long signal directly in the

！ Use of:1 、!! : Represents the previous command, as follows:Example one:./some-shell-commandCat!! (equivalent to Cat./some-shell-command)Example two:Cd/user!! (equivalent to Cd/user)2.!$: Represents the last parameter in the previous command, as

Linux vi Common commands and linux vi commandsI. move the cursorJ. Move a row down;K. Move a row up;H: move one character to the left;L move one character to the right;Ctrl + B Move the screen up;Ctrl + f move one screen down;$ Move to the end of

Enable root and disable guest in Ubuntu 14.04 System Environment: Ubuntu14.04 x64 Problem description: Ubuntu14.04's 64-bit system disables root account login by default Solution: 1. Set password for root Sudo passwd root 2. modify the