Magnum puts subnet-name instead of subnet-id in kube_openstack_config

[Grzegorz Bialas]

After creating a kubernetes cluster, config file /etc/kubernetes/kube_openstack_config is created.
This config is used to interact with openstack during creating external loadbalancer.

Config looks like:

[Global]
auth-url=https://xxxxxxxxx.xxxx.xxxx.xxx:5000/v3
ca-file=/etc/kubernetes/ca/openstack.pem
user-id=47ed0eda4ca84d55a139d238330cdc1c
password=j5s5Fh6NF73CfsVR8W
trust-id=cdeac8635a8b4d01a20b3f4a72a2b347
[LoadBalancer]
subnet=magnum-subnet
create-monitor=yes
monitor-delay=1m
monitor-timeout=30s
monitor-max-retries=3

Which results with error, when creating kuberntes service with type: loadbalancer.
Error message which can be found in logs:

Nov 24 10:06:28 mo-xalmqagc5x-0-bdjttiktarxv-kube-master-esbvlau3ldlj.novalocal kube-controller-manager[796]: E1124 10:06:28.073504 796 servicecontroller.go:779] Failed to process service. Retrying in 1m20s: Failed to create load balancer for service default/nginxservice: Error creating loadbalancer af6383a24d0fe11e79e45fa163e60988: Error creating loadbalancer {af6383a24d0fe11e79e45fa163e60988 Kubernetes external service af6383a24d0fe11e79e45fa163e60988 magnum-subnet <nil> }: Invalid request due to incorrect syntax or missing required parameters.

Config should contain subnet-id not subnet name as a value.

Working example:

[Global]
auth-url=https://xxxxxxxxx.xxxx.xxxx.xxx:5000/v3
ca-file=/etc/kubernetes/ca/openstack.pem
user-id=47ed0eda4ca84d55a139d238330cdc1c
password=j5s5Fh6NF73CfsVR8W
trust-id=cdeac8635a8b4d01a20b3f4a72a2b347
[LoadBalancer]
subnet-id=486f644d-5b5c-4fb0-b880-0c98960c6c1c
create-monitor=yes
monitor-delay=1m
monitor-timeout=30s
monitor-max-retries=3

After this change service with external loadbalancer is created properly.

[yatin (yatinkarel)]

How did you install magnum and configured kube_openstack_config. Looking at the code it set's subnet-id only: https://github.com/openstack/magnum/blob/master/magnum/drivers/common/templates/kubernetes/fragments/write-kube-os-config.sh#L16