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Haproxy high availability solution
2022-07-04 13:46:00 【51CTO】
Add --line-numbers Options
Factors that measure load balancer performance
Session rate Conversation rate ： Number of sessions per minute
Session concurrency Number of concurrent sessions ： The longer the server takes to process the session , The more concurrent sessions ;
Date rate Data rate ： With MB/s、Mbps To measure
HaProxy brief introduction
Official website ： https://www.haproxy.org/
HAProxy Is a free load balancing software , Can run on most mainstream Linux On the operating system .
Suitable for heavy load Web Site , These sites usually need session persistence or seven layer proxy .
HAProxy Core functions
- Load balancing ：L4 and L7 Two modes , Support RR/ static state RR/LC/IP Hash/URI Hash/URL_PARAM Hash/HTTP_HEADER Hash And so on
- health examination ： Support TCP and HTTP Two modes of health examination
- Conversation retention ： For application clusters without session sharing , It can be done by Insert Cookie/Rewrite Cookie/Prefix Cookie, And many of the above Hash Method to achieve session retention
- SSL：HAProxy Can be parsed HTTPS agreement , And can decrypt the request as HTTP Back to back end transmission
- HTTP Request rewriting and redirection
- Monitoring and statistics ：HAProxy Provides the basis for Web The statistics page of , Show health status and traffic data . Based on this function , Users can develop monitoring programs to monitor HAProxy The state of
HAProxy Working mode
- http: The client request is deeply analyzed and then sent to the server ;
- tcp：4 Layer scheduling , Do not check the information on the seventh floor ;
- Health： Just a health check （ Not recommended ）;
HAProxy Advantages and disadvantages
advantage
- Support sessio、cookie function ;
- Can pass Url Take a health check ;
- efficiency 、 Load balancing speed is higher than Nginx And below LVS;
- HAProxy Support TCP, It can be done to MySQL Load balancing ;
- Rich scheduling algorithms ;
shortcoming
- Regular expressions are weaker than Nginx;
- Logs depend on Syslogd;
HAProxy install
1） install haproxy
CentOS The system can use yum Install directly
see HAProxy edition
2022 The latest version in is 2.6
2） Modify the configuration file
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{ The configuration file consists of }
global: Global configuration block , Configuration parameters take effect globally ;
default: Set the default parameters for other parts that follow , The default parameters can be reset by subsequent parts （ That is, the subsequent configuration shall prevail ）;
frontend： Define front-end Services ;
backend： Define back end services
3） Service start stop
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monitor HAProxy state
see HAProxy Service port , Then through the host IP: The port is accessed in the browser HAProxy Monitoring page of .
$ ss -ntulp | grep haproxy
remarks
- Queue Information about queue data （ The current number of queues , Maximum , Queue limit number ）;
- Session rate Session rate per second （ Current value , Maximum , Limited quantity ）;
- Sessions There will always be a lot of talk （ Current value , Maximum , Total amount ,Lbtot: total number of times a server was selected Total time taken to select a server ）;
- Bytes（ Inbound 、 Outbound flow ）;
- Denied（ Refuse request 、 Reject response ）;
- Errors（ Wrong request 、 Wrong connection 、 Wrong response ）;
- Warnings（ Try warning again retry、 Reconnect the redispatches）;
- Server( state 、 The last time to check （ How long ago was the last inspection performed ）、 The weight 、 Number of backup servers 、down Number of servers 、down Machine time ).
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