412cd70d3a
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.
118 lines
3 KiB
Go
118 lines
3 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controller
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import (
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"k8s.io/apimachinery/pkg/util/intstr"
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"os"
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"os/exec"
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"syscall"
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"fmt"
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"github.com/golang/glog"
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api "k8s.io/api/core/v1"
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"k8s.io/kubernetes/pkg/util/sysctl"
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"k8s.io/ingress-nginx/internal/ingress"
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)
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// newUpstream creates an upstream without servers.
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func newUpstream(name string) *ingress.Backend {
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return &ingress.Backend{
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Name: name,
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Endpoints: []ingress.Endpoint{},
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Service: &api.Service{},
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SessionAffinity: ingress.SessionAffinityConfig{
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CookieSessionAffinity: ingress.CookieSessionAffinity{
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Locations: make(map[string][]string),
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},
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},
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}
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}
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// upstreamName returns a formatted upstream name based on namespace, service, and port
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func upstreamName(namespace string, service string, port intstr.IntOrString) string {
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return fmt.Sprintf("%v-%v-%v", namespace, service, port.String())
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}
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// sysctlSomaxconn returns the maximum number of connections that can be queued
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// for acceptance (value of net.core.somaxconn)
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// http://nginx.org/en/docs/http/ngx_http_core_module.html#listen
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func sysctlSomaxconn() int {
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maxConns, err := sysctl.New().GetSysctl("net/core/somaxconn")
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if err != nil || maxConns < 512 {
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glog.V(3).Infof("net.core.somaxconn=%v (using system default)", maxConns)
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return 511
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}
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return maxConns
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}
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// sysctlFSFileMax returns the maximum number of open file descriptors (value
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// of fs.file-max) or 0 in case of error.
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func sysctlFSFileMax() int {
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var rLimit syscall.Rlimit
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err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
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if err != nil {
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glog.Errorf("Error reading system maximum number of open file descriptors (RLIMIT_NOFILE): %v", err)
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return 0
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}
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glog.V(2).Infof("rlimit.max=%v", rLimit.Max)
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return int(rLimit.Max)
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}
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const (
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defBinary = "/usr/sbin/nginx"
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cfgPath = "/etc/nginx/nginx.conf"
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)
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var valgrind = []string{
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"valgrind",
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"--tool=memcheck",
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"--leak-check=full",
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"--show-leak-kinds=all",
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"--leak-check=yes",
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}
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func nginxExecCommand(args ...string) *exec.Cmd {
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ngx := os.Getenv("NGINX_BINARY")
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if ngx == "" {
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ngx = defBinary
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}
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cmdArgs := []string{"--deep"}
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if os.Getenv("RUN_WITH_VALGRIND") == "true" {
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cmdArgs = append(cmdArgs, valgrind...)
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}
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cmdArgs = append(cmdArgs, ngx, "-c", cfgPath)
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cmdArgs = append(cmdArgs, args...)
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return exec.Command("authbind", cmdArgs...)
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}
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func nginxTestCommand(cfg string) *exec.Cmd {
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ngx := os.Getenv("NGINX_BINARY")
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if ngx == "" {
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ngx = defBinary
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}
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return exec.Command("authbind", "--deep", ngx, "-c", cfg, "-t")
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}
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