我使用mod_wsgi lib（版本：4.2.5-1.1）生成一个具有多个进程的API服务器，以便API服务器可以提供负载平衡，这里是wsgi配置beblow：
LoadModule wsgi_module /usr/lib64/httpd/modules/mod_wsgi.so
ServerName localhost
WSGIPythonPath /opt/cloud/services/test/venv/lib/python2.7/site-packages
WSGISocketPrefix /var/run/wsgi
<VirtualHost *:8777>
WSGIDaemonProcess test-api user=openstack group=openstack processes=3 threads=2 maximum-requests=5000 shutdown-timeout=30
WSGIScriptAlias / /var/www/test/app.wsgi
WSGIProcessGroup test-api
WSGIApplicationGroup %{GLOBAL}
ErrorLog /var/log/test-apache24.log
LogLevel warn
<Directory /var/www/test>
Require all granted
</Directory>
LimitRequestLine 80000
LimitRequestFieldSize 80000
<IfModule mod_ssl.c>
SSLEngine on
SSLProtocol TLSv1.2
SSLCipherSuite E****************************************
SSLCertificateFile /etc/xxxxxxx/server-cert/test.crt
SSLCertificateKeyFile /etc/xxxxxx/server-cert/test_server.key
SSLVerifyDepth 10
</IfModule>
</VirtualHost>
Listen 196.128.8.72:8777
在此配置之后，我得到了一个预期的API服务器守护程序和子守护进程，如：
root 6344 1 0 14:31 ? 00:00:00 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
opensta+ 6345 6344 0 14:31 ? 00:00:01 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
opensta+ 6348 6344 0 14:31 ? 00:00:01 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
opensta+ 6350 6344 0 14:31 ? 00:00:01 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
wwwrun 6351 6344 0 14:31 ? 00:00:00 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
wwwrun 6355 6344 0 14:31 ? 00:00:00 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
wwwrun 6357 6344 0 14:31 ? 00:00:00 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
wwwrun 6361 6344 0 14:31 ? 00:00:00 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
wwwrun 6364 6344 0 14:31 ? 00:00:00 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
wwwrun 32172 6344 0 14:32 ? 00:00:00 /usr/sbin/httpd -f /etc/apache2cei/httpd.conf
API服务器也可以正常工作，但我发现这些守护进程创建了一些不合理的锁定文件，其状态已被linux lsof工具删除：
:~ # lsof | grep deleted
httpd 6344 root 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6345 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6345 6378 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6345 6379 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6345 6380 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6345 6381 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6348 openstack 9wW REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6348 6382 openstack 9wW REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6348 6384 openstack 9wW REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6348 6385 openstack 9wW REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6348 6386 openstack 9wW REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6350 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6350 6389 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6350 6390 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6350 6391 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6350 6392 openstack 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6351 wwwrun 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6355 wwwrun 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6357 wwwrun 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6361 wwwrun 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 6364 wwwrun 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
httpd 32172 wwwrun 9w REG 0,18 0 1937090182 /run/wsgi.6344.0.1.lock (deleted)
我们可以看到这些API守护程序通过最后一列中的进程ID使用了这些锁文件。
当我将wsgi conf文件中的进程num更改为1时，这些已删除的锁定文件消失了：
WSGIDaemonProcess test-api user=openstack group=openstack processes=1 threads=2 maximum-requests=5000 shutdown-timeout=30
所有人对此都有任何想法吗？