address and target port in the request packet to a process of the rip and port of the back-end RS selected by the scheduling algorithm;Note the following questions:1.RIP and dip must be in the same network segment and should be a private IP address; The gateway to the RS should point to the dip;2. The request message and the response message must be forwarded by the Director, the director is easy to become a system performance bottleneck and trigger a single point of failure;3. Port redirection
IP address and destination port, remain unchanged throughout the message forwarding process4. Switch-------> vs: Send a message with the VIP address to VS, by statically binding the IP address and MAC address on the router.Switch--------> RS: Switch to Rs method, there are two ways: using the Arptables,rs kernel parameters (Arp_announce, Arp_ignore) on the RS5. Port redirection is not supported6. RS for Linux7. The RIP and VIP must be configured on the RS, and the VIP should be configured on th
algorithm is:
Basic polling scheduling RR algorithm
WRR algorithm for weighted polling scheduling
A weighted minimum connection scheduling WLC algorithm
LVS Forwarding Mode
NAT (Network Address translation)
DR (Direct Routing)
TUN
LVS-DR modeForwarding processForwards all inbound requests to back-end realserver, and the backend realserver the results directly to the clientPrincipleWhen the user requests to direct Server, the source IP of this message
database.Generally, the IP segment in the database is set to double, then you need these:If Request.ServerVariables ("http_x_forwarded_for") = "" Thenip=request.servervariables ("REMOTE_ADDR") elseIP= Request.ServerVariables ("Http_x_forwarded_for") End Ifsip=ipcip=split (IP, ".") IP=256*256*256*CIP (0) +256*256*cip (1) +256*CIP (2) +
This article illustrates how the go language implements AES encryption. Share to everyone for your reference. The implementation methods are as follows:
Copy Code code as follows:
Package Main
Import (
"FMT"
"Crypto/aes"
"Strings"
)
Func Main () {
rb:=[]byte {1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6};
B:=make ([]byte,16);
Strings. Newreader ("1234567890123456"). Read (b);
B=B[0:16];
Fmt. Print ("B:", b);
cip,_:= AES. Newcipher (b);
Fmt. Pr
(' B ', ' G ') | YES | | NULL | |+-------+---------------+------+-----+---------+-------+2 rows in Set (0.00 sec)Delete primary key ALTER TABLE library. Tables drop primary key; 2) Create a primary key in a field already in the tableALTER TABLE library. Form Add primary key (field); 1.1.2 Create composite key (composite key is two primary key) (when two values may be the same, you can use a composite key to prevent two values from being the same, you can have a value of the same)Mysql> CREATE T
Php is simple and practical to obtain the client ip address. Php obtains the client ip address. it is simple and practical to use functiongetOnlineIP () {$ cipgetenv (HTTP_CLIENT_IP); $ xipgetenv (response); $ ripgetenv (REMOTE_ADDR); $ srip $ _ php obtains the client ip
Function getOnlineIP (){$ Cip = getenv ('http _ CLIENT_IP ');$ Xip = getenv ('http _ X_FORWARDED_FOR ');$ Rip = getenv ('remote _ ADDR ');$ Srip = $ _ SERVER ['remote _ ADDR '];If ($
This article mainly introduces the PHPcurl counterfeit IP address and header information code examples. This article provides the server and client implementation code, provides the counterfeit function and server detection code, for more information, see curl. although it is powerful, it can only forge $ _ SERVER ["HTTP_X_FORWARDED_FOR"]. for most IP address detection programs, $ _ SERVER ["REMOTE_ADDR"] is hard to forge:
First, the client. php code
The code is as follows:
$ Headers ['client-
PHP cannot write HTML form data to MySQL database mysql database form
PHP is getting started. I am trying to write a library database, and there are some problems with database writing.
Total interface module
Data processing for book entry-collection of books
Approve preview data
'; Echo 'cip book in version cataloguing:'. $ CIP .''.'Title: '. $ title .'Title: '. $ subtitle .'Series Name: '. $ series
); Curl_exec ($ ch );Curl_close ($ ch );$ Out = ob_get_contents ();Ob_clean (); Echo $ out;
Then there is server. php
The code is as follows:Function GetIP (){If (! Emptyempty ($ _ SERVER ["HTTP_CLIENT_IP"])$ Cip = $ _ SERVER ["HTTP_CLIENT_IP"];Else if (! Emptyempty ($ _ SERVER ["HTTP_X_FORWARDED_FOR"])$ Cip = $ _ SERVER ["HTTP_X_FORWARDED_FOR"];Else if (! Emptyempty ($ _ SERVER ["REMOTE_ADDR"])$
Although Curl is powerful, but can only forge $_server["Http_x_forwarded_for", for most IP address detection procedures, $_server["REMOTE_ADDR"] is difficult to forge:
The first is the client.php code.
Copy the Code code as follows:$headers [' client-ip '] = ' 202.103.229.40 ';$headers [' x-forwarded-for '] = ' 202.103.229.40 ';$HEADERARR = Array ();foreach ($headers as $n = = $v) {$HEADERARR [] = $n. ': '. $v;}Ob_start ();$ch = Curl_init ();curl_setopt ($ch, Curlopt_url, "http://localhost/curl
How does php obtain the local IP address ?? O (distinct _ distinct) O ~ How can I obtain the IP address of the local machine when I use the php command to execute the php file? It turns out that $ _ SERVER [] is not easy to use. thanks to O (cost _ priority) O ~, If you run on your computer, it's nothing more than 127.0.0.1. if you run on a virtual space or server, how does php get the IP address of the local machine ?? O (distinct _ distinct) O ~
How can I obtain the IP address of the local mac
Load Cluster LVS_DR Model Principle :ClientCipRequestWebresources, must go throughDirectorforwarded toRs, whileRsresponding to a request to a clientCipmust not go throughDirectorbecause the client's request was sent to theVipto respond to requests from the client, which requiresDirectorand theRsto share betweenVip. Directorof theDIP,RS1of theRIP1,RS2of theRIP2must be in the same network segment, either public or private, communication between them is based onMacaddress. RsIt's better to have a p
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.