Openstack: Too many open Files 錯誤解決辦法

Openstack WebUI頁面沒法打開，頁面報500錯誤，查看httpd->error_log日誌報以下錯誤:

[Tue Apr 02 14:01:05.658276 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 518, in request
[Tue Apr 02 14:01:05.658280 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 639, in send
[Tue Apr 02 14:01:05.658284 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 438, in send
[Tue Apr 02 14:01:05.658287 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 588, in urlopen
[Tue Apr 02 14:01:05.658291 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/packages/urllib3/connectionpool.py", line 241, in _get_conn
[Tue Apr 02 14:01:05.658296 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/packages/urllib3/util/connection.py", line 27, in is_connection_dropped
[Tue Apr 02 14:01:05.658300 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/packages/urllib3/util/wait.py", line 33, in wait_for_read
[Tue Apr 02 14:01:05.658304 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/packages/urllib3/util/wait.py", line 22, in _wait_for_io_events
[Tue Apr 02 14:01:05.658308 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/packages/urllib3/util/selectors.py", line 581, in DefaultSelector
[Tue Apr 02 14:01:05.658312 2019] [:error] [pid 9245]   File "/usr/lib/python2.7/site-packages/requests/packages/urllib3/util/selectors.py", line 394, in __init__
[Tue Apr 02 14:01:05.658316 2019] [:error] [pid 9245] IOError: [Errno 24] Too many open files

解決方式：
修改操做系統打開的文件數；登陸到Controller節點，執行:

[root@controller ~]# 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) 60587
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) 60587
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

系統默認設置爲1024。

使用命令查看當前打開文件數:

[root@controller ~]# lsof | wc -l
174911

修改vim /etc/security/limits.conf，在文件最後加入以下信息：

*               soft    nofile            1024000
*               hard    nofile            1024000

*表示全部用戶，
修改後重啓服務器，配置生效。