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Allow setting --bind-address for apiserver hyperkube (#1985)

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* Allow setting --bind-address for apiserver hyperkube

This is required if you wish to configure a loadbalancer (e.g haproxy)
running on the master nodes without choosing a different port for the
vip from that used by the API - in this case you need the API to bind to
a specific interface, then haproxy can bind the same port on the VIP:

root@overcloud-controller-0 ~]# netstat -taupen | grep 6443
tcp        0      0 192.168.24.6:6443       0.0.0.0:*               LISTEN      0          680613     134504/haproxy
tcp        0      0 192.168.24.16:6443      0.0.0.0:*               LISTEN      0          653329     131423/hyperkube
tcp        0      0 192.168.24.16:6443      192.168.24.16:58404     ESTABLISHED 0          652991     131423/hyperkube
tcp        0      0 192.168.24.16:58404     192.168.24.16:6443      ESTABLISHED 0          652986     131423/hyperkube

This can be achieved e.g via:

kube_apiserver_bind_address: 192.168.24.16

* Address code review feedback

* Update kube-apiserver.manifest.j2
This commit is contained in:
Steven Hardy 2017-11-29 15:24:02 +00:00 committed by Matthew Mosesohn
parent e5d353d0a7
commit d39a88d63f
4 changed files with 12 additions and 0 deletions
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6
docs/ha-mode.md
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@ -76,6 +76,12 @@ loadbalancer_apiserver:
port: 8383 port: 8383
``` ```
Note: The default kubernetes apiserver configuration binds to all interfaces,
so you will need to use a different port for the vip from that the API is
listening on, or set the kube_apiserver_bind_address so that the API only
listens on a specific interface (to avoid conflict with haproxy binding the
port on the VIP adddress)
This domain name, or default "lb-apiserver.kubernetes.local", will be inserted This domain name, or default "lb-apiserver.kubernetes.local", will be inserted
into the `/etc/hosts` file of all servers in the `k8s-cluster` group. Note that into the `/etc/hosts` file of all servers in the `k8s-cluster` group. Note that
the HAProxy service should as well be HA and requires a VIP management, which the HAProxy service should as well be HA and requires a VIP management, which

4
roles/kubernetes/master/defaults/main.yml
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@ -6,6 +6,10 @@ kube_hostpath_dynamic_provisioner: "false"
# change to 0.0.0.0 to enable insecure access from anywhere (not recommended) # change to 0.0.0.0 to enable insecure access from anywhere (not recommended)
kube_apiserver_insecure_bind_address: 127.0.0.1 kube_apiserver_insecure_bind_address: 127.0.0.1
# By default the external API listens on all interfaces, this can be changed to
# listen on a specific address/interface.
kube_apiserver_bind_address: 0.0.0.0
# A port range to reserve for services with NodePort visibility. # A port range to reserve for services with NodePort visibility.
# Inclusive at both ends of the range. # Inclusive at both ends of the range.
kube_apiserver_node_port_range: "30000-32767" kube_apiserver_node_port_range: "30000-32767"

1
roles/kubernetes/master/templates/kubeadm-config.yaml.j2
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@ -25,6 +25,7 @@ token: {{ kubeadm_token }}
tokenTTL: "{{ kubeadm_token_ttl }}" tokenTTL: "{{ kubeadm_token_ttl }}"
selfHosted: false selfHosted: false
apiServerExtraArgs: apiServerExtraArgs:
bind-address: {{ kube_apiserver_bind_address }}
insecure-bind-address: {{ kube_apiserver_insecure_bind_address }} insecure-bind-address: {{ kube_apiserver_insecure_bind_address }}
insecure-port: "{{ kube_apiserver_insecure_port }}" insecure-port: "{{ kube_apiserver_insecure_port }}"
admission-control: {{ kube_apiserver_admission_control | join(',') }} admission-control: {{ kube_apiserver_admission_control | join(',') }}

1
roles/kubernetes/master/templates/manifests/kube-apiserver.manifest.j2
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@ -35,6 +35,7 @@ spec:
- --etcd-certfile={{ etcd_cert_dir }}/node-{{ inventory_hostname }}.pem - --etcd-certfile={{ etcd_cert_dir }}/node-{{ inventory_hostname }}.pem
- --etcd-keyfile={{ etcd_cert_dir }}/node-{{ inventory_hostname }}-key.pem - --etcd-keyfile={{ etcd_cert_dir }}/node-{{ inventory_hostname }}-key.pem
- --insecure-bind-address={{ kube_apiserver_insecure_bind_address }} - --insecure-bind-address={{ kube_apiserver_insecure_bind_address }}
- --bind-address={{ kube_apiserver_bind_address }}
- --apiserver-count={{ kube_apiserver_count }} - --apiserver-count={{ kube_apiserver_count }}
- --admission-control={{ kube_apiserver_admission_control | join(',') }} - --admission-control={{ kube_apiserver_admission_control | join(',') }}
- --service-cluster-ip-range={{ kube_service_addresses }} - --service-cluster-ip-range={{ kube_service_addresses }}