What are the characteristics of LVS, Nginx and HAProxy load balancers in Linux

LVS features:
1. Strong load resistance, using IP load balancing technology, only distribution, so LVS itself does not generate much traffic;
2. Stability and reliability It has good performance and has a perfect hot backup plan; (such as: lvs keepalived)
3. It has a wide range of applications and can load balance all applications;
4. It does not support regular processing and cannot separate dynamic and static.
Four commonly used algorithms:
1.rr: round-robin, allocated to back-end servers in turn;
2.wrr: weighted round-robin, allocated according to the load of the back-end server;
3. lc: Minimum connection, allocated to the server with the fewest established connections;
4.wlc: Minimum weight connection, allocated based on the processing capabilities of the back-end server.
You can use ipvsadm -p (persistence) to maintain the session. The default is 300/s
nginx features:
1. Works on layer 7 and can handle regular rules; ( For example: diversion for domain names and directories)
2. The configuration is simple, and the load function can be performed if it can be pinged. The back-end server status can be detected through the port, and URL detection is not supported;
3. To resist high concurrency, use The epoll network model handles customer requests;
4. Only supports http and email, and its application scope is relatively small;
5.nginx is mainly http and reverse proxy server, with low system resource consumption.
Four commonly used algorithms:
1.rr: (default) polling, assigned to back-end servers in turn;
2.weight: allocated based on back-end server performance;
3.ip_hash: every Each request is allocated according to the hash result of the accessed IP, with appropriate concurrency hours to solve the session problem;
4.fair: (Extension strategy), the nginx kernel is not compiled by default, and the load is judged based on the back-end server response time, and the best option is selected. Handle gently.
haproxy features:
1. Supports two proxy modes: tcp (layer four) and http (layer seven), and supports virtual hosts;
1. The configuration is simple and supports URL detection of back-end server status;
2. It is only used for load balancing software. In high concurrency situations, the processing speed is higher than nginx;
3. The tcp layer is mostly used for load balancing of mysql slave (read) servers.
Four commonly used algorithms:
1.roundrobin: polling, allocated to the backend server in turn;
2.static-rr: allocated according to the performance of the backend server;
3.leastconn: minimum connection The one with priority will be processed;
4.source: According to the request source IP, similar to nginx's ip_hash.

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