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Add HA/LB endpoints for kube-apiserver

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* Add auto-evaluated internal endpoints and clarify the loadbalancer_apiserver
vars and usecases.
* Add loadbalancer_apiserver_localhost (default false). If enabled, override
the external LB and expect localhost:443/8080 to be new internal only frontends.
* Add kube_apiserver_multiaccess to ignore loadbalancers, and make clients
to access the apiservers as a comma-separated list of access_ip/ip/ansible ip
(a default mode). When disabled, allow clients to use the given loadbalancers.
* Define connections security mode for kube controllers, schedulers, proxies.
It is insecure be default, which is the current deployment choice.
* Rework the groups['kube-master'][0] hardcode defining the apiserver
endpoints.
* Improve grouping of vars and add facts for kube_apiserver.
* Define kube_apiserver_insecure_bind_address as a fact, add more
facts for ease of use.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
This commit is contained in:
Bogdan Dobrelya
2016-07-13 17:13:47 +02:00
parent 277c5d74cc
commit a70c3b661e
8 changed files with 104 additions and 37 deletions
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77
inventory/group_vars/all.yml
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@@ -53,7 +53,7 @@ cluster_name: cluster.local
# Service endpoints. May be a VIP or a load balanced frontend IP, like one
# that a HAProxy or Nginx provides, or just a local service endpoint.
#
# Etcd endpoints use a local etcd-proxies to reach the etcd cluster via
# auto-evaluated endpoints. Those will reuse the access_ip for etcd cluster,
# if specified, or defer to the localhost:2379 as well.
@@ -64,15 +64,64 @@ cluster_name: cluster.local
# This may be the case if clients support and loadbalance multiple etcd servers natively.
etcd_multiaccess: false
#
# TODO apiserver localhost:8080 and localhost:443 endpoints for kubelets and
# (hyper)kube-* and networking components.
# The port the API Server will be listening on.
kube_apiserver_port: 443 # (https)
kube_apiserver_insecure_port: 8080 # (http)
# For multi masters architecture:
# kube-proxy doesn't support multiple apiservers for the time being so you'll need to configure your own loadbalancer
# This domain name will be inserted into the /etc/hosts file of all servers
# configuration example with haproxy:
# listen kubernetes-apiserver-https
# bind 10.99.0.21:8383
# option ssl-hello-chk
# mode tcp
# timeout client 3h
# timeout server 3h
# server master1 10.99.0.26:443
# server master2 10.99.0.27:443
# balance roundrobin
# And the corresponding example config vars:
# apiserver_loadbalancer_domain_name: "lb-apiserver.kubernetes.local"
# loadbalancer_apiserver:
# adress: 10.99.0.21
# port: 8383
# For internal only multi-masters architecture:
# Assume there is no loadbalancers configured for internal access. Enable this flag,
# if a loadbalancer listens the localhost, which may be the case when there is neither
# loadbalancer_apiserver nor access_ip is configured, or you want to override both.
loadbalancer_apiserver_localhost: false
# The internal kube-apiserver endpoints:
# The secure endpoint is auto-evaluated. If loadbalancer_apiserver_localhost=true,
# it uses the localhost:kube_apiserver_port. Otherwise, it uses the external
# apiserver_loadbalancer_domain_name:loadbalancer_apiserver.port. Or defers to the
# access_ip:kube_apiserver_port, then ip, then default ansible ip.
# The insecure endpoint ignores the apiserver_loadbalancer_domain_name and access_ip.
# By default, it is a localhost:kube_apiserver_insecure_port.
# If loadbalancer_apiserver_localhost, it defers to ip, then default ansible ip.
# Apiserver access modes:
# Configure clients to access all of the apiservers directly as the
# "http(s)://hostX:port, http(s)://hostY:port, ..." and ignore the loadbalancers, if any.
# This may be the case, if clients support and loadbalance multiple apiservers or
# when there is no loadbalancers configured.
kube_apiserver_multiaccess: true
# Define connections security for kube controllers, schedulers and proxies
kube_proxy_insecure: true
kube_controller_insecure: true
kube_scheduler_insecure: true
# Choose network plugin (calico, weave or flannel)
kube_network_plugin: flannel
# Kubernetes internal network for services, unused block of space.
kube_service_addresses: 10.233.0.0/18
kube_apiserver_ip: "{{ kube_service_addresses|ipaddr('net')|ipaddr(1)|ipaddr('address') }}"
# internal network. When used, it will assign IP
# addresses from this range to individual pods.
@@ -93,11 +142,6 @@ peer_with_router: false
# Warning : enabling router peering will disable calico's default behavior ('node mesh').
# The subnets of each nodes will be distributed by the datacenter router
# The port the API Server will be listening on.
kube_apiserver_ip: "{{ kube_service_addresses|ipaddr('net')|ipaddr(1)|ipaddr('address') }}"
kube_apiserver_port: 443 # (https)
kube_apiserver_insecure_port: 8080 # (http)
# Internal DNS configuration.
# Kubernetes can create and mainatain its own DNS server to resolve service names
# into appropriate IP addresses. It's highly advisable to run such DNS server,
@@ -126,21 +170,6 @@ dns_server: "{{ kube_service_addresses|ipaddr('net')|ipaddr(2)|ipaddr('address')
# like you would do when using nova-client before starting the playbook.
# cloud_provider:
# For multi masters architecture:
# kube-proxy doesn't support multiple apiservers for the time being so you'll need to configure your own loadbalancer
# This domain name will be inserted into the /etc/hosts file of all servers
# configuration example with haproxy :
# listen kubernetes-apiserver-https
# bind 10.99.0.21:8383
# option ssl-hello-chk
# mode tcp
# timeout client 3h
# timeout server 3h
# server master1 10.99.0.26:443
# server master2 10.99.0.27:443
# balance roundrobin
# apiserver_loadbalancer_domain_name: "lb-apiserver.kubernetes.local"
## Set these proxy values in order to update docker daemon to use proxies
# http_proxy: ""
# https_proxy: ""