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nova image-list gives error during installation


I am trying to install openstack in two nodes. I am following the manual When I run the command "nova image-list" to verify nova configuration from page I got the error "ERROR (AttributeError): 'NoneType' object has no attribute 'replace'". I checked "glance image-list"and it was working. To resolve this error I uninstalled python-novaclient and then reinstalled it and then upgrade it using

  • pip uninstall python-novaclient
  • pip install python-novaclient
  • pip install --upgrade python-novaclient

After that I restarted all nova services and then run "nova image-list", then I got the error "ERROR (ConnectionRefused): Unable to establish connection to http://controller:8774/v2/3653a437d79242a0b0c0de6fc89c84dc/images/detail"

Now I have no idea what to do next to resolve to issue. Can anybody suggest me where I have gone wrong and how to resolve this issue?