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First of all I thank @schmaustech for his help and advisory<br>

I've analyzed :

# tcpdump -vv -i enp5s1

which are VXLAN endpoints Ethernet interfaces on Network && Compute Nodes
Afterwards I commented out lines ( on both nodes)

# -A INPUT -j REJECT --reject-with icmp-host-prohibited
# -A FORWARD -j REJECT --reject-with icmp-host-prohibited

which are anyway incompatible with Gluster Backend for cinder , but never before affected instances
with Ephemeral Storage.
It resolves the problem ( except Server code 1006 in noVNC console )

Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 DHCPREQUEST(tap6f93b6cb-1a) 75.0.0.13 fa:16:3e:4e:a6:f6
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 tags: tag0, known, tap6f93b6cb-1a
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 DHCPACK(tap6f93b6cb-1a) 75.0.0.13 fa:16:3e:4e:a6:f6 host-75-0-0-13
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 1:netmask, 3:router, 6:dns-server, 12:hostname,
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 15:domain-name, 26:mtu, 28:broadcast, 42:ntp-server,
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 121:classless-static-route
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 next server: 75.0.0.11
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  1 option: 53 message-type  5
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  4 option: 54 server-identifier  75.0.0.11
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  4 option: 51 lease-time  1d

Another subnet

Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 available DHCP subnet: 50.0.0.0/255.255.255.0
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 client provides name: ubuntu
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 DHCPREQUEST(tape0a57cc5-96) 50.0.0.12 fa:16:3e:4f:10:ab
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 tags: tag0, known, tape0a57cc5-96
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 DHCPACK(tape0a57cc5-96) 50.0.0.12 fa:16:3e:4f:10:ab host-50-0-0-12
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 1:netmask, 28:broadcast, 2:time-offset, 3:router,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 15:domain-name, 6:dns-server, 119:domain-search,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 12:hostname, 44:netbios-ns, 47:netbios-scope,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 26:mtu, 121:classless-static-route, 42:ntp-server
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 next server: 50.0.0.11
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  1 option: 53 message-type  5
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  4 option: 54 server-identifier  50.0.0.11
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  4 option: 51 lease-time  1d
First of all I thank @schmaustech for his help and advisory<br>
advisory

I've analyzed :

# tcpdump -vv -i enp5s1

which are VXLAN endpoints Ethernet interfaces on Network && Compute Nodes
Afterwards I commented out lines ( on both nodes)

# -A INPUT -j REJECT --reject-with icmp-host-prohibited
# -A FORWARD -j REJECT --reject-with icmp-host-prohibited

which are anyway incompatible with Gluster Backend for cinder , but never before affected instances
with Ephemeral Storage.
It resolves the problem ( except Server code 1006 in noVNC console )

Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 DHCPREQUEST(tap6f93b6cb-1a) 75.0.0.13 fa:16:3e:4e:a6:f6
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 tags: tag0, known, tap6f93b6cb-1a
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 DHCPACK(tap6f93b6cb-1a) 75.0.0.13 fa:16:3e:4e:a6:f6 host-75-0-0-13
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 1:netmask, 3:router, 6:dns-server, 12:hostname,
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 15:domain-name, 26:mtu, 28:broadcast, 42:ntp-server,
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 121:classless-static-route
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 next server: 75.0.0.11
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  1 option: 53 message-type  5
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  4 option: 54 server-identifier  75.0.0.11
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  4 option: 51 lease-time  1d

Another subnet

Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 available DHCP subnet: 50.0.0.0/255.255.255.0
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 client provides name: ubuntu
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 DHCPREQUEST(tape0a57cc5-96) 50.0.0.12 fa:16:3e:4f:10:ab
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 tags: tag0, known, tape0a57cc5-96
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 DHCPACK(tape0a57cc5-96) 50.0.0.12 fa:16:3e:4f:10:ab host-50-0-0-12
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 1:netmask, 28:broadcast, 2:time-offset, 3:router,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 15:domain-name, 6:dns-server, 119:domain-search,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 12:hostname, 44:netbios-ns, 47:netbios-scope,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 26:mtu, 121:classless-static-route, 42:ntp-server
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 next server: 50.0.0.11
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  1 option: 53 message-type  5
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  4 option: 54 server-identifier  50.0.0.11
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  4 option: 51 lease-time  1d
First of all I thank @schmaustech for his help and advisory

I've analyzed :

# tcpdump -vv -i enp5s1

which are VXLAN endpoints Ethernet interfaces on Network && Compute Nodes
Afterwards I commented out lines ( on both nodes)

# -A INPUT -j REJECT --reject-with icmp-host-prohibited
# -A FORWARD -j REJECT --reject-with icmp-host-prohibited

which are anyway incompatible with Gluster Backend for cinder , but never before affected instances
with Ephemeral Storage.
It resolves the problem ( except Server code 1006 in noVNC console )

Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 DHCPREQUEST(tap6f93b6cb-1a) 75.0.0.13 fa:16:3e:4e:a6:f6
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 tags: tag0, known, tap6f93b6cb-1a
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 DHCPACK(tap6f93b6cb-1a) 75.0.0.13 fa:16:3e:4e:a6:f6 host-75-0-0-13
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 1:netmask, 3:router, 6:dns-server, 12:hostname,
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 15:domain-name, 26:mtu, 28:broadcast, 42:ntp-server,
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 requested options: 121:classless-static-route
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 next server: 75.0.0.11
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  1 option: 53 message-type  5
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  4 option: 54 server-identifier  75.0.0.11
Jan 25 19:40:06 dnsmasq-dhcp[5602]: 3006305403 sent size:  4 option: 51 lease-time  1d

Another subnet

Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 available DHCP subnet: 50.0.0.0/255.255.255.0
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 client provides name: ubuntu
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 DHCPREQUEST(tape0a57cc5-96) 50.0.0.12 fa:16:3e:4f:10:ab
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 tags: tag0, known, tape0a57cc5-96
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 DHCPACK(tape0a57cc5-96) 50.0.0.12 fa:16:3e:4f:10:ab host-50-0-0-12
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 1:netmask, 28:broadcast, 2:time-offset, 3:router,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 15:domain-name, 6:dns-server, 119:domain-search,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 12:hostname, 44:netbios-ns, 47:netbios-scope,
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 requested options: 26:mtu, 121:classless-static-route, 42:ntp-server
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 next server: 50.0.0.11
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  1 option: 53 message-type  5
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  4 option: 54 server-identifier  50.0.0.11
Jan 25 19:54:12 dnsmasq-dhcp[5607]: 2175562843 sent size:  4 option: 51 lease-time  1d

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