Description
Set up Floating IPs with OpenStack
Setup
Follow QA:Testcase_launch_an_instance_on_OpenStack
Make sure that nova is configured with the correct public network interface.
$> ifconfig em1 em1: flags=... $> sudo openstack-config --set /etc/nova/nova.conf DEFAULT public_interface em1 $> sudo systemctl restart openstack-nova-network.service
Ensure that ICMP (ping) and SSH are allowed to your instances.
$> nova secgroup-add-rule default icmp -1 -1 0.0.0.0/0 $> nova secgroup-add-rule default tcp 22 22 0.0.0.0/0
How to test
If you've followed all of the test cases, the private network used for OpenStack instances is 10.0.0.0/24. The purpose of this functionality is to be able to assign a pool of floating public IP addresses to instances, as well.
The details of this test case are a bit specific to the environment you are using to test. For this documentation, we're going to assume that the the OpenStack server's public interface is on the 172.31.0.0/24 subnet. We are going to take an unused address range (172.31.0.241-172.31.0.254) from this subnet and define it as a floating IP address range to be used by OpenStack.
$> sudo nova-manage floating create 172.31.0.240/28 $> sudo nova-manage floating list None 172.31.0.241 None nova em1 None 172.31.0.242 None nova em1 ...
Allocate an address to use for an instance:
$> nova floating-ip-create +--------------+-------------+----------+------+ | Ip | Instance Id | Fixed Ip | Pool | +--------------+-------------+----------+------+ | 172.31.0.241 | None | None | nova | +--------------+-------------+----------+------+
Associate the allocated address with a running instance:
$> INSTANCE=<instance name> $> nova add-floating-ip $INSTANCE 172.31.0.241
Expected Results
Verify that the public IP address got assigned to your public network interface on the OpenStack server.
$> ip addr
...
2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:13:20:f5:f9:8d brd ff:ff:ff:ff:ff:ff
inet 172.31.0.107/24 brd 172.31.0.255 scope global em1
inet 172.31.0.241/32 scope global em1
inet6 fe80::213:20ff:fef5:f98d/64 scope link
valid_lft forever preferred_lft forever
Also see the IP address reported as associated with the instance:
$> nova show $INSTANCE | grep network | testnet network | 10.0.0.2, 172.31.0.241 |
Verify that you can now ssh into the instance using the newly assigned address:
$> cd ~/novacreds $> ssh -i nova_key.priv -o UserKnownHostsFile=/dev/null root@172.31.0.241
Note if running openstack within a VM, then the floating address will not be accessible from outside (probably due to the iptables NAT being bypassed by the bridge (ebtables) rules within the VM)
Check for new errors in the logs:
$> grep -i error /var/log/nova/*.log
If you would like, you can now disassociate and release the address assigned for testing.
$> nova remove-floating-ip $INSTANCE 172.31.0.241 $> nova floating-ip-delete 172.31.0.241