[Record] PHP-fpm accounts for 100% of CPU fixed

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Record once php-fpm accounts for 100% of the cpu and fix it

Problem description:

According to feedback from business personnel, the front-end page returned a 502 error. After querying the server, it was found that there are two php-fpm accounting for 100% of the CPU. Restarting php-fpm has no effect.

Solution:

1. Use top to find the process ID that accounts for 100% of the cpu, and use ll /proc/PID/fd to check which file the process is operating on. Only found in the operation log file, but no data is written to the log file.

2. Then use strace -p pid to check the process ID of the full CPU and find that write (xxx) error is always reported.

3. Then use df -h to find that a disk is full and the log cannot be written, causing php-fpm to occupy 100% of the CPU.

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