oopenstack突然web页面无法打开，页面报500错误，查看httpd日志报如下错误
[Fri Feb 01 13:47:36.120854 2019] [:error] [pid 28948] [remote 192.168.14.83:680] IOError: [Errno 24] Too many open files: '/usr/share/openstack-dashboard/openstack_dashboard/themes/default/templates/500.html' [Fri Feb 01 13:52:21.837032 2019] [mpm_prefork:notice] [pid 5454] AH00170: caught SIGWINCH, shutting down gracefully [Fri Feb 01 13:54:50.565154 2019] [suexec:notice] [pid 5490] AH01232: suEXEC mechanism enabled (wrapper: /usr/sbin/suexec) [Fri Feb 01 13:54:50.579447 2019] [auth_digest:notice] [pid 5490] AH01757: generating secret for digest authentication ... [Fri Feb 01 13:54:50.579837 2019] [lbmethod_heartbeat:notice] [pid 5490] AH02282: No slotmem from mod_heartmonitor [Fri Feb 01 13:54:50.590593 2019] [mpm_prefork:notice] [pid 5490] AH00163: Apache/2.4.6 (CentOS) mod_wsgi/3.4 Python/2.7.5 configured -- resuming normal operations [Fri Feb 01 13:54:50.590627 2019] [core:notice] [pid 5490] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND' [Fri Feb 01 13:56:15.154790 2019] [:error] [pid 5495] WARNING:root:Use of this 'djano.wsgi' file has been deprecated since the Rocky release in favor of 'wsgi.py' in the 'openstack_dashboard' module. This file is a legacy naming from before Django 1.4 and an importable 'wsgi.py' is now the default. This file will be removed in the T release cycle.
突然想起在安装的时候忘记修改操作系统打开的文件数；登录到控制节点执行
[root@ipr-controller httpd]# ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 62931 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 62931 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited [root@ipr-controller httpd]# [root@ipr-controller httpd]# [root@ipr-controller httpd]# ulimit -n 1024
查看当前打开文件数，明显超过了1024
[root@ipr-controller httpd]# lsof | wc -l 98026
修改默认值
vim /etc/security/limits.conf 在最后加入如下信息：
* soft nofile 1024000 * hard nofile 1024000
*表示所有用户
修改后重启服务器，配置生效