I use nginx 1.2.3(php-fpm) php 5.4.7 pecl memcached 2.1.0 memcached 1.4.15
If memcached service stops or gets a not found key, nginx returns 502 error and in error_log I see:
2013/11/19 17:37:04 [error] 3972#0: *554345 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: x.x.x.x , server: www.site.com, request: "GET /test/mk.php?get=var1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.site.com"
php-fpm.log say:
[19-Nov-2013 17:58:32] WARNING: [pool www] child 4626 exited with code 127 after 18.892556 seconds from start
[19-Nov-2013 17:58:32] NOTICE: [pool www] child 4641 started
Can anybody help me?