重啟服務時起不來，日誌也不報錯，以glance服務為例，如下：

[[email protected] glance]# systemctl status openstack-glance-api.service
● openstack-glance-api.service - OpenStack Image Service (code-named Glance) API server
   Loaded: loaded (/usr/lib/systemd/system/openstack-glance-api.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Mon 2016-08-15 00:11:01 CST; 9min ago
  Process: 52295 ExecStart=/usr/bin/glance-api (code=exited, status=1/FAILURE)
 Main PID: 52295 (code=exited, status=1/FAILURE)

Aug 15 00:11:00 open01 systemd[1]: openstack-glance-api.service: main process exited, code=exited, status=1/FAILURE
Aug 15 00:11:00 open01 systemd[1]: Unit openstack-glance-api.service entered failed state.
Aug 15 00:11:00 open01 systemd[1]: openstack-glance-api.service failed.
Aug 15 00:11:01 open01 systemd[1]: openstack-glance-api.service holdoff time over, scheduling restart.
Aug 15 00:11:01 open01 systemd[1]: start request repeated too quickly for openstack-glance-api.service
Aug 15 00:11:01 open01 systemd[1]: Failed to start OpenStack Image Service (code-named Glance) API server.
Aug 15 00:11:01 open01 systemd[1]: Unit openstack-glance-api.service entered failed state.
Aug 15 00:11:01 open01 systemd[1]: openstack-glance-api.service failed.
 

錯誤分析

之前mariadb起不來也是類似錯誤，但是輸入journalctl -xn 後，會顯示配置錯誤，訂正my.cnf 就可以但glance報這個錯誤怎麼解決？我還沒做什麼呢，他說連線過快，無奈之下想起了“重啟試試，不行就分”。重啟吧，重啟也沒用，那就卸掉glance元件，刪掉資料庫，刪掉keystone連結重來吧，結果還是沒卵用。

類似這種服務起不來的情況，依個人經歷作如下總結

1.配置文件有錯，訂正配置文件，再次啟動

2.相關資料夾/檔案的許可權有問題，檢視許可權，修改許可權

錯誤解決

因為我都是root許可權操作的，所以同步資料庫經常用用的是glance-manage db_sync

Traceback (most recent call last):
  File "/usr/bin/glance-manage", line 10, in <module>
    sys.exit(main())
  File "/usr/lib/python2.7/site-packages/glance/cmd/manage.py", line 273, in main
    log.setup('glance')
  File "/usr/lib/python2.7/site-packages/glance/openstack/common/log.py", line 460, in setup
    _setup_logging_from_conf(product_name, version)
  File "/usr/lib/python2.7/site-packages/glance/openstack/common/log.py", line 529, in _setup_logging_from_conf
    filelog = logging.handlers.WatchedFileHandler(logpath)
  File "/usr/lib64/python2.7/logging/handlers.py", line 392, in __init__
    logging.FileHandler.__init__(self, filename, mode, encoding, delay)
  File "/usr/lib64/python2.7/logging/__init__.py", line 902, in __init__
    StreamHandler.__init__(self, self._open())
  File "/usr/lib64/python2.7/logging/__init__.py", line 925, in _open
    stream = open(self.baseFilename, self.mode)
IOError: [Errno 13] Permission denied: '/var/log/glance/api.log'
 

# ll /var/log/glance/api.log                                                          
-rw-r--r--. 1 root root 14783 Jul 11 22:25 /var/log/glance/api.log

# chown -R glance:glance /var/log/glance/api.log
# su -s /bin/sh -c "glance-manage db_sync" glance
#  systemctl start openstack-glance-api.service 

[[email protected] glance]# systemctl status openstack-glance-api.service
● openstack-glance-api.service - OpenStack Image Service (code-named Glance) API server
   Loaded: loaded (/usr/lib/systemd/system/openstack-glance-api.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2016-08-15 00:20:46 CST; 3s ago
 Main PID: 52567 (glance-api)
   CGroup: /system.slice/openstack-glance-api.service
           ├─52567 /usr/bin/python2 /usr/bin/glance-api
           ├─52648 /usr/bin/python2 /usr/bin/glance-api
           └─52649 /usr/bin/python2 /usr/bin/glance-api

Aug 15 00:20:47 open01 glance-api[52567]: /usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py:22: DeprecationWa...ately.
Aug 15 00:20:47 open01 glance-api[52567]: return pkg_resources.EntryPoint.parse("x=" + s).load(False)
Aug 15 00:20:47 open01 glance-api[52567]: /usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py:22: DeprecationWa...ately.
Aug 15 00:20:47 open01 glance-api[52567]: return pkg_resources.EntryPoint.parse("x=" + s).load(False)
Aug 15 00:20:47 open01 glance-api[52567]: /usr/lib64/python2.7/site-packages/cryptography/x509/__init__.py:32: Pendin...ionOID
Aug 15 00:20:47 open01 glance-api[52567]: from cryptography.x509.oid import (
Aug 15 00:20:47 open01 glance-api[52567]: /usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py:22: DeprecationWa...ately.
Aug 15 00:20:47 open01 glance-api[52567]: return pkg_resources.EntryPoint.parse("x=" + s).load(False)
Aug 15 00:20:47 open01 glance-api[52567]: /usr/lib/python2.7/site-packages/paste/deploy/loadwsgi.py:22: DeprecationWa...ately.
Aug 15 00:20:47 open01 glance-api[52567]: return pkg_resources.EntryPoint.parse("x=" + s).load(False)
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