Fuel is not starting deployment, it argues that Public IP range is not enough

[Igor Braginsky]

The issue is, that Fuel will not start deployment, it will argue that Public IP range is not enough and requires at least 7 IPs (in this example 8 IPs are allocated already).
The workaround is to add one more IP to the public range.

I used IP range 10.7.208.53 >> 10.7.208.76 for both Public and Neutron L3. IP allocation is as follows:
• Fuel Master IP: 10.7.208.53
• Public Range: 10.7.208.54 >> 10.7.208.61 (8 IPs used for physical servers)
• Neutron L3 Range: 10.144.254.62 >> 10.144.254.76 (15 IPs used for Floating IP pool)

Steps to reproduce:
• Install Fuel 6.1
• Install Mellanox plugin
• Discover nodes (in my case 7 nodes total - 3 Controllers, 3 Computes, 1 Cinder)
• Perform usual steps on setting tab (enable Mellanox Openstack features, Public network assignment, etc)
• Assign roles to the nodes, configure network interfaces
• On Network tab specify Public Range: 10.7.208.54 >> 10.7.208.61
• Neutron L3 Range: 10.144.254.62 >> 10.144.254.76
• Save and test network settings.
• After network test pass – deploy
• Observe error message

[Alexander Kislitsky (akislitsky)]

Igor, could you provide diagnostic snapshot, please.

[deactivateduser (deactivateduser-deactivatedaccount)]

To get the diganostic snapshot please perform these steps:

1 - Please check to confirm you have sufficient free space on the fuel master node, as follows:
Amount of free space available in /var/www/nailgun/dump, where snapshot will be stored:
df -hP /var/www/nailgun/dump
should be bigger than size of remote logs:
du -hs /var/log/remote/

2 - Login to fuel web interface by following the link http://<ip_fuel_master_node>:8000
3 - Click Support at the top
4 - Click "Generate diagnostic snapshot"
5 - Download generated snapshot (may take up to 10 minutes depending on volume of logs)
6 - If your downloaded snapshot is under 20MB, you may attach it to this ticket.

If it is larger than 20MB, please upload it to a 3rd party service, such as Google Drive or DropBox, and reply with a link to download it.

[Igor Braginsky (igorbr)]

No need in diagnostic snapshot, I have found that since 6.1 version one more IP is needed for virtual router, so there is no bug.