Cloud Applications

MD is different in processing read/write errors. When data writing errors occur, the processing is relatively simple. When an error occurs during reading, it is troublesome. it calculates the data that cannot be read and writes it back to the disk.

Linux multithreading 1. thread Overview a thread is a basic scheduling unit in a process, also known as a lightweight process. Threads are concurrent multi-path execution paths in the shared memory space. they share the resources of a process, such

Basic format: * The command indicates that the 1st column of the day-to-month command indicates minute 1 ~ 59 every minute, use * or */1 to indicate 2nd columns to indicate hour 1 ~ 23 (0 indicates 0 points) column 3rd indicates date 1 ~ 31 column

In the semop operation of Linux semaphore PV, the sem_flg members of the sembuf structure can be 0, IPC_NOWAIT, and SEM_UNDO. When it is set to SEM_UNDO, it will enable the operating system to track the changes made by the current process to this

Linux timer use Postedon2010-03-2017: 40feisky read (1073) Comments (0) edit favorite use timer is nothing more than to periodically execute a task, or it takes a specified time to execute a task. To achieve this goal, there are generally...   Linux

Linux process scheduling 1. Cache-primary storage structure 1. Advantages of Cache: the read/write speed of lCache can almost match with that of the CPU, greatly providing system access speed. The lCache capacity is relatively small than the primary

CentOS 5.6 is installed under the virtual machine. Use the NAT mode to share the Internet with the host pc! Of course, you can build lamp by compiling the source code. This section describes how to quickly build a php development framework. In fact,

I always forget the location of these configuration files, 1. modify the IP address to modify the corresponding nic ip address configuration file # vi/etc/sysconfig/network-scripts/ifcfg-eth0 to modify the following content DEVICEeth0 # describe the

LinuxDeployRails3withRuby1.9.2 (4) ConfiguretherailsinApache2Changetheconfigurationofapache2 & gt; vihttpd. confLoadModulepassenger_module/home/luohua/. rvm/rubies/rub Linux Deploy Rails3 with Ruby1.9.2 (4) Configure the rails in Apache2 Change the

Grub configuration file: [root @ lyygrub] # ll total 199-rw-r -- r -- 1rootroot6010-2620: 05device. map # grub device file-rw-r -- 1rootroot758410-2620: 05e2fs_stage1_5 # ext2/ext3... Grub configuration files:[Root @ lyy grub] # llTotal 199-Rw-r -- 1

Popen () function introduction function definition FILE * popen (constchar * command, constchar * type); intpclose (FILE * stream); function description popen () function creates a pipeline, call fork to generate a sub-process ,... Introduction to

Test Environment: 1. ubuntu10.04LST2 on the VM. putty is connected through SSH (this step is not required, I am using this method to connect to javastuserver) the software package to be installed: The first step of installation, these are the

An error is reported when Nginx is installed./configure: error: theHTTPrewritemodulerequiresthePCRElibrary. install pcre-devel to solve the problem. yum-yinstallpcre-devel error prompt:./configure: error: theHTTPcachemo... An error occurred while

The subscript of the array in shell is 1 starting from 0 by default. Put the string in the array and get its length #! /Bin/bashstr & quot; AB -- nd & quot; array ($ str) length $ {# array [@]} echo $ lengthfor (i0; I & lt; $ length; I ++) doecho $ {

24. vi, vim text processor/word ,? Word, dd, ndd, yy, nyy, p, P, I, Esc,: q !, : Wq,: setnuvim has the color display function and supports many syntaxes. the vim setting values of both C and shell scripts are generally stored in the/etc/vimrc file.

The following content is from the network and is backed up: ssh supports port forwarding. Ssh's three powerful port forwarding commands: QUOTE: ssh-C-f-N-g-Llisten_port: DST_Host: DST_portuser @ Tunnel_Hostssh-C-f-N-g-Rliste... The following content

Grub mode to edit grub. conf/boot/grub. conf in the kernel/boot/vmlinuz-2.6.18-128.el5rorootLABEL/rhgbquietvga791 after restarting the computer through GRUB can view the modified results. Depth for different colors and resolutions --... Grub

First, generate the public key on the local machine: Java code [root@localhost.ssh] # ssh-keygen-d always press the Enter key Generatingpublic/privatedsakeypair. enterfileinwhichtosavethekey (/root /. ssh/id_dsa ):... First, generate a public key on

1. change the system time zone to the Shanghai time zone cp/usr/share/zoneinfo/Asia/Shanghai/etc/localtime2. write a script ntp. cron #! /Bin/bash/usr/sbin/ntpdatentp.fudan.edu.cn | logger-tNTP put the script in/etc/cron. daily... 1. change the

In linux, the data items of/etc/fstab are as follows: Device name Mount point partition type mount option dump option fsck option LABEL/ext3defaults11tmpfs/dev/shmtmpfsdefaults00devpts/dev/ptsdevptsg...   In linux, the data items of/etc/fstab are as