On Mon, Aug 29, 2016 at 9:10 PM, Cameron Braid <came...@braid.com.au> wrote:
> I'm working on an origin master native HA setup > > The docs say : The advanced installation method does not currently support > multiple HAProxy load balancers in an active-passive setup. > https://docs.openshift.org/latest/install_config/install/ > advanced_install.html#multiple-masters > > 1) Doesn't that mean that the load balancer would be a single point of > failure ? > Yes, the haproxy instance installed is meant to be a stop-gap until an HA load balancing solution can be provided. If an external load balancer solution can be pre-configured, then skipping the definition of the [lb] host, should be sufficient for installation. 2) is it just the installation method that doesn't support installing > multiple instances? I.e. I presume I can setup my own redundant ha proxy > load banalcers and point them all to the three master nodes ? > Correct, or any other LB solution. > 3) what is the difference between openshift_master_cluster_hostname and > openshift_master_cluster_public_hostname. Am I right in saying that the > nodes will resolve the master api via openshift_master_cluster_hostname > and the openshift_master_cluster_public_hostname is for things like the > oc client tool ? > Yes. The distinction is to better support cloud or NAT environments where user access to the API or console would be over a separate network/DNS name from internal cluster traffic. > 4) is there a way to get the masters to listen on a different port ? > Setting openshift_master_api_port and openshift_master_console_port would override the default port. 5) say I run 3 masters. If I connect to a passive master port 8443, will it > proxy traffic to the active master ? Or will it respond with a failing > health check so that the loadbalancer takes it out of service ? > The API servers run as active/active. The origin-controllers/atomic-openshift-controllers service will only be active on a single host in the cluster (handled through a lock held in etcd). The API service also exposes /healthz/ready which can be used for configuring load balancer health checks. -- Jason DeTiberus
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