Commits on Aug 8, 2019

1. openstack: Remove the Service VM …

   The experimental OpenStack backend used to create an extra server
   running DNS and load balancer services that the cluster needed.
   OpenStack does not always come with DNSaaS or LBaaS so we had to provide
   the functionality the OpenShift cluster depends on (e.g. the etcd SRV
   records, the api-int records & load balancing, etc.).
   
   This approach is undesirable for two reasons: first, it adds an extra
   node that the other IPI platforms do not need. Second, this node is a
   single point of failure.
   
   The Baremetal platform has faced the same issues and they have solved
   them with a few virtual IP addresses managed by keepalived in
   combination with coredns static pod running on every node using the mDNS
   protocol to update records as new nodes are added or removed and a
   similar static pod haproxy to load balance the control plane internally.
   
   The VIPs are defined here in the installer and they use the
   PlatformStatus field to be passed to the necessary
   machine-config-operator fields:
   
   openshift/api#374
   
   The Bare Metal IPI Networking Infrastructure document is applicable here as
   well:
   
   https://github.com/openshift/installer/blob/master/docs/design/baremetal/networking-infrastructure.md
   
   There is also a great opportunity to share some of the configuration
   files and scripts here.
   
   This change needs several other pull requests:
   
   Keepalived plus the coredns & haproxy static pods in the MCO:
   openshift/machine-config-operator#740
   
   Co-authored-by: Emilio Garcia <egarcia@redhat.com>
   Co-authored-by: John Trowbridge <trown@redhat.com>
   Co-authored-by: Martin Andre <m.andre@redhat.com>
   Co-authored-by: Tomas Sedovic <tsedovic@redhat.com>
   
   Massive thanks to the Bare Metal and oVirt people!

   

   trown authored and tomassedovic committed Aug 8, 2019
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