. Azure load Balancing currently supports three distribution modes:1, five-tuple,2, Ternary,3, two-tuple. load Balancing set on the portal defaults to a five-tuple (source IP, source port, Destination IP, destination port, protocol type) to calculate the hash value. If a two-tuple (source IP, Destination IP) Distribution mode is used, the connection from the same client will be distributed to the same serve
Apache HTTP Server is selected as the front-end Server Load balancer, and two Tomcat clusters are selected at the backend. The selected configuration method is session sticky (sticky session ), this method forwards requests from t
time is short of priority allocation. upstream Backserver {server server1;server server2;Fair;}5. Url_hash (third party)assign requests by the hash result of the access URL so that each URL is directed to the same back-end server, which is more efficient when the backend server is cached. upstream Backserver {server squid1:3128;server squid2:3128;hash $request _uri;Hash_method CRC32;}in servers that need to use load balancing, addProxy_pass http://ba
Session retention is one of the most common problems in load balancing and is a relatively complex issue.Session hold is sometimes called sticky session (Sticky Sessions).Before we introduce session-keeping techniques, we have to
sessionid are different;Different computers that must be needless to say, certainly different!SummarizeThe final effect is achieved, the configuration process also has a variety of problems, and finally solved. Session sharing has always been a focus of load balancing and cluster attention, and it is a key point to be mastered by your small partners!Session shar
Redis/Distributed File Storage System/database storage session solves session inconsistency in the Server Load balancer cluster, redissession
Let's talk about the similarities and differences between sessions and cookies.
Session and cookie are not only stored on the server
;Create mod. conf in the/usr/local/apache/conf/directory:LoadModule jk_module modules/mod_jk-1.2.31-httpd-2.2.x.soJkWorkersFile conf/workers. properties# JkMount/*. jsp lbcontroller# JkMount/*. do lbcontrollerJkMount/* lbcontroller # you can configure multiple apache distributors as needed./* indicates that apache distributes all files by lbcontroller. You can set it by yourself *. jsp ,*. do and so on2.2 workers. properties fileCreate the workers. properties file in the conf directory under apa
F5 is a well-known Server Load balancer product. I believe many people will not know it. So how does it maintain sessions? Let's start with the definition of session persistence. As an image metaphor: Session persistence can be seen as a string of pearls, so we split each Pearl and put it in a different box for storage
the value of the sqlconnectionstring at the same time, in the format:sqlconnectionstring= "Data source=localhost; Integrated Security=sspi; "Where data source refers to the IP address of the SQL Server server, if SQL Server and IIS are a machine, write 127.0.0.1. Integrated SECURITY=SSPI means that Windows Integrated authentication is used, so that access to the database is made as an ASP, and by this configuration, SQL can be obtained that is more than using the userid=sa;password= password Be
Through the Ip_hash to do the session to maintain a certain defect, this is through the client IP to achieve. Many client access servers under the same network will be thrown to the same machine, or the CDN will result in unbalanced load. So to implement through the client cookie implementation, including the F5, the deep convincing device where the session remai
1. Use Nginx Ip_hash as Load Balancer Service and support session sticky2, using nginx sticky third-party module to achieve cookie-based load balancing3, using the Nginx map instruction according to the cookie shunt:Map $COOKIE _abcdexpid $group { ~*1$apache001; ~*2$apache
: This article mainly introduces several methods for nginx server load balancer to process session sharing. For more information about PHP tutorials, see.
1) use cookie instead of sessionBy changing the session into a cookie, you can avoid some drawbacks of the session. in a
If you have not set up the nginx environment, please refer to my previous blog
Nginx Load Balancing
Lab Environment
Win7: tomcat6 + jdk6 + memcached
Linux: vmware9 + Ubuntu + jdk6 + nginx + tomcat6 + memcached
First, install memcached in windows.
Memcached-1.2.6-win32-bin.zip, 64-bit can also
Install memcached.exe-D install as a Windows Service
Memcached.exe-d start
Configure the memcached port, HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Servi
shunt, the rest of the other back end. 4) Upstream_hashto solve some of the ip_hash problems, you can use Upstream_hash, the third-party module, which is used in most cases as url_hash, but does not prevent it from being used for session sharing:If the front end is squid, he will add IP to x_forwarded_for this http_header, with Upstream_hash can use this head to do the factor, the request directed to the specified backend:This document is visible:htt
shunt, the rest of the other back end.4) Upstream_hashTo solve some of the ip_hash problems, you can use Upstream_hash, the third-party module, which is used in most cases as url_hash, but does not prevent it from being used for session sharing:If the front end is squid, he will add IP to x_forwarded_for this http_header, with Upstream_hash can use this head to do the factor, the request directed to the specified backend:This document is visible:http
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