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安装openstack-dashboard时出现的python compress command not found错误解决办法

httpd服务启动失败

# systemctl status httpd      
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/httpd.service.d
           └─openstack-dashboard.conf
   Active: failed (Result: exit-code) since Fri 2016-10-14 16:13:27 CST; 25s ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 86591 ExecStartPre=/usr/bin/python /usr/share/openstack-dashboard/manage.py compress --force (code=exited, status=1/FAILURE)
  Process: 86581 ExecStartPre=/usr/bin/python /usr/share/openstack-dashboard/manage.py collectstatic --noinput --clear (code=exited, status=0/SUCCESS)
 Main PID: 82651 (code=exited, status=0/SUCCESS)

Oct 14 16:13:27 bdc2 python[86591]: CommandError: An error occurred during rendering /usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html: /bin/sh: django_pyscss.compressor.DjangoScssFilter: command not found
Oct 14 16:13:27 bdc2 python[86591]: Found 'compress' tags in:
Oct 14 16:13:27 bdc2 python[86591]: /usr/lib/python2.7/site-packages/horizon/templates/horizon/_conf.html
Oct 14 16:13:27 bdc2 python[86591]: /usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html
Oct 14 16:13:27 bdc2 python[86591]: /usr/lib/python2.7/site-packages/horizon/templates/horizon/_scripts.html
Oct 14 16:13:27 bdc2 python[86591]: Compressing...
Oct 14 16:13:27 bdc2 systemd[1]: httpd.service: control process exited, code=exited status=1
Oct 14 16:13:27 bdc2 systemd[1]: Failed to start The Apache HTTP Server.
Oct 14 16:13:27 bdc2 systemd[1]: Unit httpd.service entered failed state.
Oct 14 16:13:27 bdc2 systemd[1]: httpd.service failed.

执行上面状态中失败的命令会出现具体的错误信息

# /usr/bin/python /usr/share/openstack-dashboard/manage.py compress --force
Found 'compress' tags in:
        /usr/lib/python2.7/site-packages/horizon/templates/horizon/_conf.html
        /usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html
        /usr/lib/python2.7/site-packages/horizon/templates/horizon/_scripts.html
Compressing... CommandError: An error occurred during rendering /usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html: /bin/sh: django_pyscss.compressor.DjangoScssFilter: command not found

错误分析： python-django无法执行compress的命令，按照网上的说法修改文件中的compress

{% load compress %}

{% compress css %}

{% endcompress %}

将type='text/scss' 修改为type='text/x-scss' 或者type='text/css' ,重启httpd服务，服务依旧启动失败或者能够启动成功，但是查看状态依旧显示异常。

正确的解决办法： 修改django-pyscss的版本，2.0.2版本的才可以正常使用 默认安装的时候，会自动安装epel中的源，版本为1.0.5

# yum list|grep django-pyscss
python-django-pyscss.noarch             1.0.5-2.el7                    @epel  
# cd /usr/lib/python2.7/site-packages/
# ls |grep pyscss
django_pyscss
django_pyscss-1.0.5-py2.7.egg-info

把1.0.5版本去掉，使用pip安装2.0.2版本

# cd /usr/lib/python2.7/site-packages/
# mv django_pyscss-1.0.5-py2.7.egg-info  django_pyscss-1.0.5-py2.7.egg-info_bak
# pip install django-pyscss==2.0.2
# pip list|grep pyscss
django-pyscss (2.0.2)

重启httpd服务

# systemctl restart httpd
# systemctl status httpd
● httpd.service - The Apache HTTP Server
   Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/httpd.service.d
           └─openstack-dashboard.conf
   Active: active (running) since Fri 2016-10-14 16:40:52 CST; 27min ago
     Docs: man:httpd(8)
           man:apachectl(8)
  Process: 89942 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited, status=0/SUCCESS)
  Process: 90015 ExecStartPre=/usr/bin/python /usr/share/openstack-dashboard/manage.py compress --force (code=exited, status=0/SUCCESS)
  Process: 90007 ExecStartPre=/usr/bin/python /usr/share/openstack-dashboard/manage.py collectstatic --noinput --clear (code=exited, status=0/SUCCESS)
 Main PID: 90044 (httpd)
   Status: "Total requests: 81; Current requests/sec: 0; Current traffic:   0 B/sec"
   CGroup: /system.slice/httpd.service
           ├─90044 /usr/sbin/httpd -DFOREGROUND
           ├─90046 /usr/sbin/httpd -DFOREGROUND
           ├─90047 (wsgi:keystone- -DFOREGROUND
           ├─90048 (wsgi:keystone- -DFOREGROUND
           ├─90049 (wsgi:keystone- -DFOREGROUND
           ├─90050 (wsgi:keystone- -DFOREGROUND
           ├─90051 (wsgi:keystone- -DFOREGROUND
           ├─90052 (wsgi:keystone- -DFOREGROUND
           ├─90053 (wsgi:keystone- -DFOREGROUND
           ├─90054 (wsgi:keystone- -DFOREGROUND
           ├─90055 (wsgi:keystone- -DFOREGROUND
           ├─90056 (wsgi:keystone- -DFOREGROUND
           ├─90057 /usr/sbin/httpd -DFOREGROUND
           ├─90058 /usr/sbin/httpd -DFOREGROUND
           ├─90059 /usr/sbin/httpd -DFOREGROUND
           ├─90061 /usr/sbin/httpd -DFOREGROUND
           ├─90156 /usr/sbin/httpd -DFOREGROUND
           ├─90157 /usr/sbin/httpd -DFOREGROUND
           ├─90158 /usr/sbin/httpd -DFOREGROUND
           ├─90260 /usr/sbin/httpd -DFOREGROUND
           ├─91346 /usr/sbin/httpd -DFOREGROUND
           └─91355 /usr/sbin/httpd -DFOREGROUND

Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-af.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-ja.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-ar-DZ.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-ky.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-ar.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-lb.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-az.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-lt.min.js'
Oct 14 16:40:41 bdc2 python[90007]: Copying '/usr/share/javascript/jquery_ui/ui/minified/i18n/jquery.ui.datepicker-be.min.js'
Oct 14 16:40:52 bdc2 systemd[1]: Started The Apache HTTP Server.

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