nginx 502 Bad Gateway

Question

nginx 502 Bad Gateway server has been reporting this error recently. Can you please provide a solution?

阿神 · Answer

Look at the php slow log. See what caused it, whether it was a mysql query or php.

某草草 · Answer

There are many opinions on the Internet, but they are basically response timeouts. Can optimize the server's configuration file, buffering, number of PHP processes, maximum execution time, etc.

给我你的怀抱 · Answer

Specific errors should be analyzed in detail. There are many reasons for 502

It is recommended that LZ open the log and read the log first

PHP中文网 · Answer

I checked the bandwidth and the CPU is normal. Our statistics are that for 100 visits, 502 bad getway will appear 8 times

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