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implement canary annotation and alternative backends

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Adds the ability to create alternative backends. Alternative backends enable
traffic shaping by sharing a single location but routing to different
backends depending on the TrafficShapingPolicy defined by AlternativeBackends.

When the list of upstreams and servers are retrieved, we then call
mergeAlternativeBackends which iterates through the paths of every ingress
and checks if the backend supporting the path is a AlternativeBackend. If
so, we then iterate through the map of servers and find the real backend
that the AlternativeBackend should fall under. Once found, the
AlternativeBackend is embedded in the list of VirtualBackends for the real
backend.

If no matching real backend for a AlternativeBackend is found, then the
AlternativeBackend is deleted as it cannot be backed by any server.
This commit is contained in:
Conor Landry 2018-09-18 14:05:32 -04:00
parent 5ceb723963
commit 412cd70d3a
18 changed files with 859 additions and 23 deletions
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8
internal/ingress/controller/util.go
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@ -17,10 +17,13 @@ limitations under the License.
package controller
import (
"k8s.io/apimachinery/pkg/util/intstr"
"os"
"os/exec"
"syscall"
"fmt"
"github.com/golang/glog"
api "k8s.io/api/core/v1"
@ -43,6 +46,11 @@ func newUpstream(name string) *ingress.Backend {
}
}
// upstreamName returns a formatted upstream name based on namespace, service, and port
func upstreamName(namespace string, service string, port intstr.IntOrString) string {
return fmt.Sprintf("%v-%v-%v", namespace, service, port.String())
}
// sysctlSomaxconn returns the maximum number of connections that can be queued
// for acceptance (value of net.core.somaxconn)
// http://nginx.org/en/docs/http/ngx_http_core_module.html#listen