OpenStack setup, jz

OpenStack Setup I. Environment Preparation Management network configuration is set to Host-Only mode. The official explanation states that the management network accesses the internet to install software packages. If there is an internal yum source, the management network does not need to access the internet and can be configured in Host-Only mode. Tunnel network configuration is set to Host-Only mode because the tunnel network does not need to access the internet and is only used to carry the network traffic of OpenStack internal tenants. External network configuration is set to NAT mode. The external network of the control node mainly implements access from the OpenStack tenant network to the public internet, as well as other purposes.