For a one-time troubleshooting page 502, page 502 Troubleshooting _php Tutorial

For a one-time troubleshooting page 502, page 502 troubleshooting

First, Scene: System Deepin 15;php 5.5.33;nginx 1.9.9

Second, the situation: simple page output normal (such as phpinfo ();), run any of the company's projects, are 502

Third, the investigation

1, query various logs, including Nginx.error.log, Php_error.log, Php-fpm.error.log, find PHP-FPM error as follows

[22-mar-2016 11:06:32] WARNING: [Pool www] child 3665 exited with code 127 after 24.657496 seconds from start[22-mar-2016 11:06:32] NOTICE: [ Pool WWW] Child 3676 started

2, the first thought is caused by the PHP-FPM process, the Php-fpm.ini made the following changes

(This step is the same as many solutions on the web, but it has no effect)

Pm.max_children =Pm.start_servers = Pm.min_spare_servers =tenpm.max_spare_servers =Pm.process_ Idle_timeout = 10spm.max_requests =    

3, after a large number of queries, there is said that the number of Linux file handle is insufficient

(Forget to keep the URL and change the place, after a toss and no effect)

4, regression Php-fpm.error.log, through exited with code 127 to find

(http://www.faqs.org/docs/abs/HTML/exitcodes.html)

5, based on the previous step to think of using Strace to track the PHP-FPM process, methods divided into two

(In fact, this step should be tried, Rango http://rango.swoole.com/archives/340)

5.1, set the PHP-FPM process number limit to 1, and then directly strace-p 123456 to track a single process

5.2. Use the following command to track the process in bulk

Ps-ef | grep FPM | awk ' {print '-P ' | Xargs Strace

Because the problem is their own machine, no one else to access, so use the second method for tracking, some of the results are as follows

[PID  6744] Fstat (5, {st_mode=s_ifreg|0644, st_size=5016, ...}) = 0[pid  6744] Mmap (NULL, 5016, Prot_read, MAP _shared, 5, 0) = 0x7f132588f000[pid  6744] Munmap (0x7f132588f000, 5016) = 0[pid  6744] Close (5)                    = 0 [PID  6744] Writev (2, [{"Php-fpm:pool www", +}, {":", 2}, {"Symbol lookup error", +}, {":", 2}, {"/usr/local/p Hp/lib/php/extension "..., +," {":", 2}, {"Undefined symbol:mmc_queue_pop", +}, {"", 0}, {"", 0}, {"\ n", 1}], 10) = 145 [PID  6744] Exit_group (127)             =?    

Set to the error message undefined Symbol:mmc_queue_pop

6, since it is memcache expansion error, then began to toss, starting from the basic compilation command

cd/data/memcache-3.0.8/
/usr/local/php/bin/phpize                                                                                                ./configure--with-php-config=/usr/local/php/bin/php-Config
#sudo makes clean #但存在多次编译安装时, it's best to clear                                         sudo makesudo make install

Look carefully and find out./configure a WARNING.

Configure:WARNING:You would need re2c 0.13.4 or later if you want to regenerate PHP parsers.

Then began to complement RE2C, and recompile memcache, restart PHP-FPM, but still error

7, finally found an article, said that "My memcache is originally from the official website of the beta version, re-download a stable version of the installation of the problem is OK."

And I use is the beta version of the memcache-3.0.8, so immediately download stable version of the memcache-2.2.7 recompile, the problem successfully resolved.

(http://www.phpjiayuan.com/77/433.html)

IV. Special statement: The articles mentioned in this article, in part from a development group of the Great God, in this acknowledgement!

Five, PostScript: This issue is not only exists in PHP 5.5.33 + memcache-3.0.8 (Beta), pending follow-up

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