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Creating self service network. [closed]

asked 2019-05-16 05:45:32 -0500

Hi, I have used networking option-2 for neutron service.

According to the following guides,

https://docs.openstack.org/install-guide/launch-instance-networks-provider.html (https://docs.openstack.org/install-gu...)

https://docs.openstack.org/install-guide/launch-instance-networks-selfservice.html (https://docs.openstack.org/install-gu...)

to create self-service network, I need to create a provider network too.

while creating a subnet for the provider network using following command,

openstack subnet create --network provider \
  --allocation-pool start=START_IP_ADDRESS,end=END_IP_ADDRESS \
  --dns-nameserver DNS_RESOLVER --gateway PROVIDER_NETWORK_GATEWAY \
  --subnet-range PROVIDER_NETWORK_CIDR provider

Q1) should i give the dns-nameserver IP address to be one of the ip address in the /etc/resolv.conf in the controller machine ? or can i use google dns-name server 8.8.8.8

Q2) Should i always give the gateway ip to be the gateway ip which i have used in the controller machine? for example if my gateway ip in the controller is 203.0.113.1, then should i always provide that only or can i provide random gateway xx.xx.xx.1

Q3) how about assigning allocation-pool for provider network?

Q4) is it necessary to create provider network subnet to create self-service network.

I'm bit confused. Please help me out.

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Closed for the following reason the question is answered, right answer was accepted by Bernd Bausch
close date 2019-05-19 18:42:53.289238

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answered 2019-05-16 22:00:46 -0500

updated 2019-05-16 22:20:56 -0500

I agree it’s not that simple. The below is from memory; I hope it’s correct:

Answers 1 and 2 are based on https://docs.openstack.org/install-gu....

Q1: The document says

Replace DNS_RESOLVER with the IP address of a DNS resolver. In most cases, you can use one from the /etc/resolv.conf file on the host.

If the host has access to a DNS server on the internet, that works as well.

Q2: Not a random number, but

Replace PROVIDER_NETWORK_GATEWAY with the gateway IP address on the provider network, typically the “.1” IP address.

Q3: The allocation pool is necessary for floating IPs and anything that you connect to the network directly, including instances and routers.

Q4: Without a subnet, ports connected to the network can’t have IP addresses. Therefore, you need it.

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Thanks Bernd

Spoorthi Vaidya gravatar imageSpoorthi Vaidya ( 2019-05-16 23:45:48 -0500 )edit

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Asked: 2019-05-16 05:37:04 -0500

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Last updated: May 16