Shulou(Shulou.com)06/02 Report--

Nginx_upstream load balancing & highly available load balancing scheduling algorithm: upstream duanserver {server 192.168.4.41 weight=1 max_fails=3 fail_timeout=10s; server 192.168.4.42 weight=2 max_fails=3 fail_timeout=10s; 80 weight=2 max_fails=3 fail_timeout=10s;} server {listen 80; server_name www.xxx.com; root / usr/local/nginx/html; location / {root html; index index.html index.htm Proxy_pass http://duanserver; # backend service experienced the following error condition and failed over (can be automatically cut off & switched back) Proxy_next_upstream http_403 http_404 http_500 http_502 http_503 error timeout invalid_header; include / usr/local/nginx/conf/proxy.conf;} error_page 500 502 503 504 / 50x.htl; location = / 50x.html {root html;}}

Polling: requests are allocated one by one, and back-end outages are automatically eliminated.

Weight: weight polling

Ip_hash: assigned according to the source IP hash result, the same IP visitor regularly visits a back-end server to solve the session sharing problem of dynamic web pages.

Fair: intelligent algorithm (intelligent selection according to page size & loading time, priority allocation of short back-end processing time), need to load upstream_fair module, high consumption performance

Url_hash: access url hash result allocation, and each url is permanently directed to a backend server to improve backend efficiency (nginx hash package needs to be loaded)

Define the status of the backend server:

Down: do not participate in the load

Backup: reserved machine, (enabled when all non-backup failures or busy)

Max_fails: allow the number of failed requests

Failtimeout: after maxfails failures, suspend the service time and use it together

When scheduling algorithm ip_hash, the state cannot be backup & weight

Any question, please contact me!

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