安装openstack时apache无法启动

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在CentOS 7 上安装openstack-dashboard时httpd服务启动失败

出现如下的报错信息：

May 22 09:17:05 controller0 python[3431]: CommandError: An error occurred during rendering /usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html: /bin/sh: django_pyscss.compressor.DjangoScssFilter: command not found

May 22 09:17:05 controller0 python[3431]: Found 'compress' tags in:
May 22 09:17:05 controller0 python[3431]: /usr/lib/python2.7/site-packages/horizon/templates/horizon/_conf.html
May 22 09:17:05 controller0 python[3431]: /usr/share/openstack-dashboard/openstack_dashboard/templates/_stylesheets.html
May 22 09:17:05 controller0 python[3431]: /usr/lib/python2.7/site-packages/horizon/templates/horizon/_scripts.html
May 22 09:17:05 controller0 python[3431]: Compressing...
May 22 09:17:05 controller0 systemd[1]: httpd.service: control process exited, code=exited status=1
May 22 09:17:05 controller0 systemd[1]: Failed to start The Apache HTTP Server.

centos7 中的python版本为2.7

django-pyscss的版本为要在2.0以上才能正常使用，而自带版本为：

[root@controller0 ~]# yum list|grep django-pyscss
python-django-pyscss.noarch 1.0.5-2.el7 @epel

所以需要更新django-pyscss版本，过程如下：

1、首先安装 pip

参照： PIP Installation

2、安装新版本django-pyscss

[root@controller0 tmp]#pip install django-pyscss==2.0.2

[root@controller0 tmp]# pip list | grep pyscss

django-pyscss (2.0.2)

重新启动httpd

systemctl start httpd.service

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