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Add etcd proxy support

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* Enforce a etcd-proxy role to a k8s-cluster group members. This
provides an HA layout for all of the k8s cluster internal clients.
* Proxies to be run on each node in the group as a separate etcd
instances with a readwrite proxy mode and listen the given endpoint,
which is either the access_ip:2379 or the localhost:2379.
* A notion for the 'kube_etcd_multiaccess' is: ignore endpoints and
loadbalancers and use the etcd members IPs as a comma-separated
list. Otherwise, clients shall use the local endpoint provided by a
etcd-proxy instances on each etcd node. A Netwroking plugins always
use that access mode.
* Fix apiserver's etcd servers args to use the etcd_access_endpoint.
* Fix networking plugins flannel/calico to use the etcd_endpoint.
* Fix name env var for non masters to be set as well.
* Fix etcd_client_url was not used anywhere and other etcd_* facts
evaluation was duplicated in a few places.
* Define proxy modes only in the env file, if not a master. Del
an automatic proxy mode decisions for etcd nodes in init/unit scripts.
* Use Wants= instead of Requires= as "This is the recommended way to
hook start-up of one unit to the start-up of another unit"
* Make apiserver/calico Wants= etcd-proxy to keep it always up

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Co-authored-by: Matthew Mosesohn <mmosesohn@mirantis.com>
This commit is contained in:
Bogdan Dobrelya
2016-07-11 16:05:05 +02:00
parent a2540e3318
commit 32cd6e99b2
26 changed files with 396 additions and 56 deletions
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17
inventory/group_vars/all.yml
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@@ -51,6 +51,23 @@ cluster_name: cluster.local
# but don't know about that address themselves.
# access_ip: 1.1.1.1
# 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.
# Etcd access modes:
# Enable multiaccess to configure clients to access all of the etcd members directly
# as the "http://hostX:port, http://hostY:port, ..." and ignore the proxy loadbalancers.
# 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.
# Choose network plugin (calico, weave or flannel)
kube_network_plugin: flannel