Problems in a website Cluster Environment and website Cluster Environment

Problems in a website Cluster Environment and website Cluster Environment

I deploy a mobile application website in a production environment using nginx to load three servers.

In the last two weeks, the product manager repeatedly reported the following error when some customer service personnel visited one of the "Order Management" functions:

Because there has been no online connection in the last two weeks, it is initially suspected that the program file versions of the three online servers are inconsistent.

Every day, there are many things, and I have not asked the O & M personnel to verify them. Every time the product asks about this, I always get bored.

We went to O & M for verification yesterday at the launch date. After investigation, it was not surprising that there was an old version of the program on a server node. It may be that the node was not overwritten when it was launched. After the program file version is unified, everything is safe.