Hi Amey, The documentation that you linked to is specifically for the ansible deployment host, which can be separate from the OpenStack target hosts if you wish. The only requirement is that it has ssh access to the target hosts, by default this would be via the network attached to br-mgmt on those hosts. In terms of the target hosts networking, you should refer to https://docs.openstack.org/project-deploy-guide/openstack-ansible/latest/targethosts.html#configuring-the-network. OpenStack-Ansible does not prescribe any particular method for setting up the host networking as this tends to be specific to the individual environment or deployer preferences. You should pick most appropriate network config tool for your OS/environment and create the bridges and networks listed in the table on the target hosts documentation. I would always recommend starting with an All-In-One deployment https://docs.openstack.org/openstack-ansible/latest/user/aio/quickstart.html. This will generate a complete test environment with all the host networking set up correctly and will serve as a reference example for a production deployment. Do join the #openstack-ansible IRC channel if you would like to discuss any of the options further. Regards, Jonathan. On 10/02/2021 10:09, Amey Abhyankar wrote: > Hello, > > I am trying to install OpenStack by referring following guides = > > 1) https://docs.openstack.org/project-deploy-guide/openstack-ansible/latest/deploymenthost.html > 2) https://docs.openstack.org/openstack-ansible/victoria/user/test/example.html > > In link number 2, there is a step to configure interfaces. > In CentOS 8 we don't have a /etc/network/interfaces file. > Which interface file should I configure? > Or do I need to create all virtual int's manually using nmcli? > > Pls suggest thanks. > > Regards, > Amey. > >