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controller error when i Created a domain, projects, users, and roles

Hi, I did this page and installed and configure the OpenStack Identity service but when i want to create a domin or ... I got controller error. https://docs.openstack.org/keystone/pike/install/keystone-install-rdo.html this error. Failed to discover availabe identity version when contacting http://controller:5000/v3 , attemping to parse verion from url . unable to establish connection to http://controller:5000/v3/auth/tokens: HTTPconnectionPool(host='controller',port=5000): most retries exceeded with url: /v3/auth/tokens ( Caused by newConnectionerror ('<urllib3.connection.httpconnection.object at="" 0x755f3a50="">: Failed to establish a new coonection : [Errno -2] Name or service not known ',))

os: centos7 openstack version:rocky