nginx的502问题
# vim test.com.conflocation ~ \.php$
{
include fastcgi_params;
fastcgi_pass unix:/tmp/php-fcgi.sock;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /data/wwwroot/test.com/$fastcgi_script_name;
}
(如上在虚拟主机里面配置的php解析，需要注意几个地方1fastcgi_pass unix:/tmp/php-fcgi.sock; 这里的路径不要写错，如果写错会出现502问题，
# cat /usr/local/php-fpm/etc/php-fpm.conf
pid = /usr/local/php-fpm/var/run/php-fpm.pid
error_log = /usr/local/php-fpm/var/log/php-fpm.log
listen = /tmp/php-fcgi.sock （这个路径要与nginx虚拟主机的路径完全保持一致）
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
pm.max_children = 50
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 500
rlimit_files = 1024
还有另一种情况就是php监听的不是sock，而是ip加端口的情况时
location ~ \.php$
{
include fastcgi_params;
#fastcgi_pass unix:/tmp/php-fcgi.sock;
fastcgi_pass 127.0.0.1:9000
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /data/wwwroot/test.com/$fastcgi_script_name;
}
这时fastcgi_pass 127.0.0.1:9000 这里就需要这样操作，这的ip要与php配置文件里面监听的地址保持一致）
第2个需要注意的地方：fastcgi_param SCRIPT_FILENAME /data/wwwroot/test.com/$fastcgi_script_name; 这里的路径要与server 下的
{
listen 80;
server_name test.com test2.com lll.com;
index index.html index.htm index.php admin.php;
root /data/wwwroot/test.com; 这个路径保持一致。
if ($host != 'test.com' ) {
rewrite^/(.*)$http://test.com/$1permanent;
}
3.php5.4之后的版本有个特性：
# vi /usr/local/php-fpm/etc/php-fpm.conf （在配置文件中）
listen = /tmp/php-fcgi.sock
listen.mode = 666
（如果监听的是sock就必须要监听mode）
#listen.mode = 666
# ls -l /tmp/php-fcgi.sock
srw-rw---- 1 root root 0 8月15 03:02 /tmp/php-fcgi.sock
（可以看到属主属组都为root，并且没有读的权限）
# curl -x127.0.0.1:80 test.com/admin.php -I
HTTP/1.1 502 Bad Gateway
Server: nginx/1.12.1
Date: Mon, 14 Aug 2017 19:03:48 GMT
Content-Type: text/html
Content-Length: 173
Connection: keep-alive
（当在curl时会发现报502）
# tail -n3 /usr/local/nginx/logs/nginx_error.log
2017/08/14 22:24:06 3684#0: *7 connect() to unix:/php-fcgi.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: test.com, request: "HEAD HTTP://test.com/admin.php HTTP/1.1", upstream: "fastcgi://unix:/php-fcgi.sock:", host: "test.com"
2017/08/15 03:03:48 3682#0: *5 connect() to unix:/tmp/php-fcgi.sock failed (13: Permission denied) while connecting to upstream, client: 127.0.0.1, server: test.com, request: "HEAD HTTP://test.com/admin.php HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-fcgi.sock:", host: "test.com"
2017/08/15 03:06:03 3682#0: *7 connect() to unix:/tmp/php-fcgi.sock failed (13: Permission denied) while connecting to upstream, client: 127.0.0.1, server: test.com, request: "HEAD HTTP://test.com/admin.php HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-fcgi.sock:", host: "test.com"
（查看错误日志，Permission denied发现拒绝，没有权限。是因为它的属主，属组为nobody ,此时如果将/tmp/php-fcgi.sock 的权限设置为nobody就没有任何问题了）
# ps aux |grep nginx
root 34850.00.1212721652 ? Ss 02:28 0:00 nginx: master process /usr/local/nginx/sbin/nginx -c /usr/local/nginx/conf/nginx.conf
nobody 36820.00.2231523796 ? S 03:01 0:00 nginx: worker process
nobody 36830.00.2231523300 ? S 03:01 0:00 nginx: worker process
root 37910.00.0 112664 972 pts/0 S+ 03:11 0:00 grep --color=auto nginx
（还有一种情况也是502就是nginx的资源耗尽））
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