Small and medium-sized companies realize operation and maintenance "hot replacement", "hot deployment" and "hot configuration"

The basic steps for small and medium-sized companies to achieve "hot replacement", "hot deployment" and "hot configuration" in operation and maintenance:
Purpose: to achieve R&D, deployment, and configuration changes without service interruption.

1-2 front-end nginx servers are required as reverse proxy: the
minimum system is 1 front-end nginx, back-end 2 cluster machines, and back-end 2 redis-server distributed storage, and then mysql database dual-host hot backup . This can basically be achieved, hot switch, hot update and hot backup.

The front-end nginx has a reverse proxy function, and can determine whether the back-end server is healthy. If it is determined to be unhealthy, no more data packets will be sent to the back. According to the characteristics of the health statistics mechanism, low-cost, program "hot update" "And the "hot deployment" of service software.