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* Virtual server - combination of virtual IP and port, is also known as listener and we associate virtual server to pool members. |
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* Virtual server - combination of virtual IP and port, is also known as listener and we associate virtual server to pool members. |
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= load balacing mehtods = |
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= load balancing methods = |
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static -Round robin , ratio |
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Dyanamic -LFOPD (least connection ,fastest ,observed,predective,dyanmic ratio ) |
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* Static - Round robin, Ratio |
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* Dynamic -LFOPD -> Least connection, Fastest, Observed, Predictive, Dynamic ratio |
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;Details: |
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Least connection -load balacing is based on no of connection counts ,if the connection counts are equal it will use round robin |
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* Least connection - Load balancing is based on no of connection counts, if the connection counts are equal it will use round robin. |
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* Fastest - No of layer 7 request pending on each member. |
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* Observed - ration load balancing method but ratio assigned by BIG IP, No off least connections counts BIG IP assign the request and check dynamically and assign the ratio's of the request. |
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* Predictive - similar to observed but assigns the ratio aggressively based on average connection counts . |
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;Load balancing by pool member or node: |
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* Priority activation -helps to configure back sets for existing pool members .BIG IP will use high priority pool member first . |
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* Fallback host is only used for HTTP request ,if all the pool members are not available BIG will redirect the client request |
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== Monitors == |
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Fastest -No of layer 7 request pending on each member. |
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* Check the status of nodes and pool members, if any pool member response time is not good or is not responding Big IP will not send the request to that node. |
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Observed -ration load balacing method but ratio assigned by BIG IP,No off least connections counts BIG IP assign the request and check dyanamically and assign the ratio's of the request. |
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Predective -similar to oberved but assigns the ratio agressivley based on average connection counts . |
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* Address check - BIG IP send ICMP request and wait for reply if there is no reply it considers nei down does not send the traffic further to that node. |
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* Service check - will check TCP port number on which server is listening ,if no response it considers down ---- |
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* Content check - we can check if the server is responding with right contest ,like for http request get/http .... request is send . |
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* Interactive check - TEST for FTP connection .once connection is open username and password is send then request is send get /file once file is received connection is closed . |
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*F5 recommends time out = 3n+1 ( frequency) for setting the monitor for http |
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load balacing by poolmember or node . |
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*Customization of monitor |
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== Profiles == |
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Priorty activation -helps to configure back sets for exsiting pool members .BIG Ip will use high priorty pool member first . |
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* Defining traffic behavior for virtual server. |
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Fallback host is only used for HTTP request ,if all the pool memebers are not availiable BIG will redirect the cilent request |
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* Profiles contains setting how to process traffic though virtual servers. If for certain application BIG IP load balance the traffic then it will break the client connection |
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to avoid this we use prescience profile so that return request for the client is send to same server. |
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* Persistence profile - is configured for clients and group of clients how BIG IP knows the returning client request need to send to same server, persistence profile is configured taking source IP address of http cookie |
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Monitors :check the status of nodes and pool memembers ,if any pool meember resposnse time is not good or is not responding big ip will not send the request to that node. |
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adress check -BIG IP send ICMP request and wait for reply if there is no reply it considers nei down does not send the trafic further to that node. |
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* All virtual servers have layer four profile includes TCP, UDP, Fast, l4 |
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service check -will check TCP port number on which server is lisenting ,if no responce it considers down ---- |
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contect check -we can check if the server is resondping with right contest ,like for http requset get/http .... request is send . |
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interactive check -TEST for FTP connection .once connection is open username and password is send then request is send get /file once file is recieved connection is closed . |
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F5 recommends time out = 3n+1 ( frquency) for setting the monitor for http |
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------------------------------- |
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Profiles -defining traffic behaviour for virtual server. |
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Profiles contains setting how to process traffic though virtual servers. if for certain application BIG IP load balace the traffic then it will break the client connection |
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to avoid this we use perstiance profile so that return request for the cilent is send to same server. |
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persisteance profile - isconfigured for clients and group of cilents how BIG IP knows the returning client request need to send to same server , persistance profile is confiured taking source ip address of http cookie |
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All virtual servers have layer four profile includes tCP,UDP, fastl4 |
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Profile types -service profile , persistance profile ,protocol profile , ssl profile ,authentication profile ,other profiles. |
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* Profile types - service profile, persistence profile ,protocol profile, SSL profile, authentication profile, other profiles. |
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= Persistence types = |
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= Persistence types = |