Linux

1. Big BlueprintThe big blueprint shows the interaction between the IPV4 protocol and other subsystems, Paul's device drivers, NetFilter, L4 layer protocols, and so on. Messages in the IPV4 protocolWe can roughly see the flow of data in the IPV4

Environment:A server: Nic 1:192.168.1.151 nic 2:10.10.69.10B Server: Nic 1:10.10.69.41Requirements:Access to 192.168.1.151:1521 is access to 10.10.69.41:1521Enable port forwarding:Echo 1 >/proc/sys/net/ipv4/ip_forwardEmptying the NAT tableIptables-t

I. Recurring Task schedule Type:1, one-time task Execution (At,batch)-not important:A, at:Interactive: Let the user enter multiple commands to execute at the at> prompt.For example: #at 10:02, go to the AT command prompt, as follows:#at >

Lsof is the abbreviation for List open files, on Linux and other Unix, and on Mac XosView open files/directories and corresponding processes command-line string pid process iduser user fd TXT (process program

Installation Environment Description: Centos+vmwareWordPress is a blog platform developed using the PHP language that allows users to build their own websites on servers that support PHP and MySQL databases. WordPress can also be used as a content

Transferred from: http://www.cnblogs.com/lonelycatcher/archive/2011/12/22/2297349.htmlFunction Description: Manipulate file characteristics According to the file description.#include #include int fcntl (int fd, int cmd);int fcntl (int fd, int cmd,

awk Basic usage:awk [Options] ' program ' file1 file2program:pattern{ACTION STATEMENT} is made up of statements, and the statement delimiter is a semicolonAction:print, printfoption:-F: Indicates the input field delimiter-V var=value: variable

1 #include 2 ssize_t recv (int sockfd, void *buff, size_t nbytes, int flags); 3 ssize_t Send (int sockfd, const void *buff, size_t nbytes, int flags);The first 3 parameters of recv and send are equivalent to read and write.The flags parameter has a

Restart your computer now echo "B" >/proc/sysrq-triggerTurn off the computer now echo "O" >/proc/sysrq-triggerExport memory allocation information echo "M" > Proc/sysrq-trigger (can be viewed with/var/log/message) Outputs memory statistics to the

In VMware Workstation, there are 3 virtual switches by default, VMNET0 (using bridged networks), VMNET1 (Host network only), and VMnet8 (NAT network).First of all, why use NAT mode, if your physical machine's Internet environment is constantly

* Initialize git repository, use git init command* Add files to git repository in two steps:1, use git add filename, can be used several times, add multiple files to staging area2. Use git commit-m "instructions"; Complete commit to Branch* View

Today accidentally received a message, really shocked me, blog Xuan sent me a message, said it is my blog article has characteristics can be out of the book, this simply let me flattered, I just a junior technical house, write blog is also some of

First, why to encryptIn the network of the Big Forest, all the data transmission is not safe, in the data transmission must be encrypted to prevent theft by others hijacked Ii. how data is transmitted in the networkWhat steps have been taken

1, CHGRP (change the file belongs to the user group)CHGRP user Group filename # # #便是这个格了. If the entire contents are changed, the plus-r parameter is used for recursion.Example: Chgrp-r user smb.conf2. Chown (change file owner)Landscape: A:chown

The grouping at the IP layer is called a datagram. This section focuses on the format of the datagram and how the IP packet header format is defined in Linux.First, the format of the datagram is as follows:which1. Version: version 4 and version 62.

Etc/rc. d/command explanation under centos6.51./etc/rc. localThis is a user-defined boot Startup Program. Write the program that needs to be automatically started into this script. If I want to complete other actions after the run level 3 service is

Virtual Host on Apache (Virtual Host created on Apache), virtualapache 0. Introduction Usually, we want to build two or more websites on a web server, but we have only one IP and do not want to use ports (eg. www.abc.com: 8081) to visit webpages. So,

Install kvm in centos 7.0 PRE-INSTALL ========================================================== ================================== Kvm-related installation packages and their functions Major kvm packages of qemu-KVM Command Line tools and libraries

Ubuntu 14.04.2 LTS configuration DN Sserver Our goal is to use a lan machine to complete the resolution of 192.168.1.113 cloudshield.com, specifying A record and CNAME; 0. Skip downloading, installing, and updating ubuntu; 1. Download the

Zabbix monitors the memory usage and process count of Nginx, php-fpm, and MySQL. Zabbix uses custom scripts to monitor the memory usage and process count of Nginx, php-fpm, and MySQL. First, add a script under the zabbix Script directory and write