C12s/c12s-kubespray
3
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Merge pull request #549 from bogdando/fix_ha_lb

Browse source 
Update ha docs
This commit is contained in:
Smaine Kahlouch 2016-10-17 15:45:35 +02:00 committed by GitHub
commit 35753f0a61
1 changed files with 11 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
docs/ha-mode.md
View file

@ -49,9 +49,11 @@ type. The following diagram shows how traffic to the apiserver is directed.
![Image](figures/loadbalancer_localhost.png?raw=true) ![Image](figures/loadbalancer_localhost.png?raw=true)
..note:: Kubernetes master nodes still use insecure localhost access because Note: Kubernetes master nodes still use insecure localhost access because
there are bugs in Kubernetes <1.5.0 in using TLS auth on master role there are bugs in Kubernetes <1.5.0 in using TLS auth on master role
services. services. This makes backends receiving unencrypted traffic and may be a
security issue when interconnecting different nodes, or maybe not, if those
belong to the isolated management network without external access.
A user may opt to use an external loadbalancer (LB) instead. An external LB A user may opt to use an external loadbalancer (LB) instead. An external LB
provides access for external clients, while the internal LB accepts client provides access for external clients, while the internal LB accepts client
@ -81,24 +83,19 @@ loadbalancer_apiserver:
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
is out of scope of this doc. is out of scope of this doc. Specifying an external LB overrides any internal
localhost LB configuration.
Specifying an external LB overrides any internal localhost LB configuration. Note: In order to achieve HA for HAProxy instances, those must be running on
Note that for this example, the `kubernetes-apiserver-http` endpoint the each node in the `k8s-cluster` group as well, but require no VIP, thus
has backends receiving unencrypted traffic, which may be a security issue no VIP management.
when interconnecting different nodes, or maybe not, if those belong to the
isolated management network without external access.
In order to achieve HA for HAProxy instances, those must be running on the
each node in the `k8s-cluster` group as well, but require no VIP, thus
no VIP management.
Access endpoints are evaluated automagically, as the following: Access endpoints are evaluated automagically, as the following:
| Endpoint type | kube-master | non-master | | Endpoint type | kube-master | non-master |
|------------------------------|---------------|---------------------| |------------------------------|---------------|---------------------|
| Local LB | http://lc:p | http://lc:sp | | Local LB | http://lc:p | https://lc:sp |
| External LB, no internal | http://lc:p | https://lb:lp | | External LB, no internal | https://lb:lp | https://lb:lp |
| No ext/int LB (default) | http://lc:p | https://m[0].aip:sp | | No ext/int LB (default) | http://lc:p | https://m[0].aip:sp |
Where: Where: