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generator.go
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generator.go
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package keepalived
import (
"fmt"
"strconv"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/restclient"
kclientcmd "k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
dapi "github.com/openshift/origin/pkg/deploy/api"
"github.com/openshift/origin/pkg/generate/app"
"github.com/openshift/origin/pkg/ipfailover"
)
const defaultInterface = "eth0"
const libModulesVolumeName = "lib-modules"
const libModulesPath = "/lib/modules"
// Get kube client configuration from a file containing credentials for
// connecting to the master.
func getClientConfig(path string) (*restclient.Config, error) {
if 0 == len(path) {
return nil, fmt.Errorf("You must specify a .kubeconfig file path containing credentials for connecting to the master with --credentials")
}
rules := &kclientcmd.ClientConfigLoadingRules{ExplicitPath: path, Precedence: []string{}}
credentials, err := rules.Load()
if err != nil {
return nil, fmt.Errorf("Could not load credentials from %q: %v", path, err)
}
config, err := kclientcmd.NewDefaultClientConfig(*credentials, &kclientcmd.ConfigOverrides{}).ClientConfig()
if err != nil {
return nil, fmt.Errorf("Credentials %q error: %v", path, err)
}
if err := restclient.LoadTLSFiles(config); err != nil {
return nil, fmt.Errorf("Unable to load certificate info using credentials from %q: %v", path, err)
}
return config, nil
}
// Generate the IP failover monitor (keepalived) container environment entries.
func generateEnvEntries(name string, options *ipfailover.IPFailoverConfigCmdOptions, kconfig *restclient.Config) app.Environment {
watchPort := strconv.Itoa(options.WatchPort)
replicas := strconv.Itoa(options.Replicas)
insecureStr := strconv.FormatBool(kconfig.Insecure)
VRRPIDOffset := strconv.Itoa(options.VRRPIDOffset)
return app.Environment{
"OPENSHIFT_MASTER": kconfig.Host,
"OPENSHIFT_CA_DATA": string(kconfig.CAData),
"OPENSHIFT_KEY_DATA": string(kconfig.KeyData),
"OPENSHIFT_CERT_DATA": string(kconfig.CertData),
"OPENSHIFT_INSECURE": insecureStr,
"OPENSHIFT_HA_CONFIG_NAME": name,
"OPENSHIFT_HA_VIRTUAL_IPS": options.VirtualIPs,
"OPENSHIFT_HA_NETWORK_INTERFACE": options.NetworkInterface,
"OPENSHIFT_HA_MONITOR_PORT": watchPort,
"OPENSHIFT_HA_VRRP_ID_OFFSET": VRRPIDOffset,
"OPENSHIFT_HA_REPLICA_COUNT": replicas,
"OPENSHIFT_HA_USE_UNICAST": "false",
// "OPENSHIFT_HA_UNICAST_PEERS": "127.0.0.1",
}
}
// Generate the IP failover monitor (keepalived) container configuration.
func generateFailoverMonitorContainerConfig(name string, options *ipfailover.IPFailoverConfigCmdOptions, env app.Environment) *kapi.Container {
containerName := fmt.Sprintf("%s-%s", name, options.Type)
imageName := fmt.Sprintf("%s-%s", options.Type, ipfailover.DefaultName)
image := options.ImageTemplate.ExpandOrDie(imageName)
// Container port to expose the service interconnects between keepaliveds.
ports := make([]kapi.ContainerPort, 1)
ports[0] = kapi.ContainerPort{
ContainerPort: options.ServicePort,
HostPort: options.ServicePort,
}
mounts := make([]kapi.VolumeMount, 1)
mounts[0] = kapi.VolumeMount{
Name: libModulesVolumeName,
ReadOnly: true,
MountPath: libModulesPath,
}
privileged := true
return &kapi.Container{
Name: containerName,
Image: image,
Ports: ports,
SecurityContext: &kapi.SecurityContext{
Privileged: &privileged,
},
ImagePullPolicy: kapi.PullIfNotPresent,
VolumeMounts: mounts,
Env: env.List(),
}
}
// Generate the IP failover monitor (keepalived) container configuration.
func generateContainerConfig(name string, options *ipfailover.IPFailoverConfigCmdOptions) ([]kapi.Container, error) {
containers := make([]kapi.Container, 0)
if len(options.VirtualIPs) < 1 {
return containers, nil
}
config, err := getClientConfig(options.Credentials)
if err != nil {
return containers, err
}
env := generateEnvEntries(name, options, config)
c := generateFailoverMonitorContainerConfig(name, options, env)
if c != nil {
containers = append(containers, *c)
}
return containers, nil
}
// Generate the IP failover monitor (keepalived) container volume config.
func generateVolumeConfig() []kapi.Volume {
// The keepalived container needs access to the kernel modules
// directory in order to load the module.
hostPath := &kapi.HostPathVolumeSource{Path: libModulesPath}
src := kapi.VolumeSource{HostPath: hostPath}
vol := kapi.Volume{Name: libModulesVolumeName, VolumeSource: src}
return []kapi.Volume{vol}
}
// Generates the node selector (if any) to use.
func generateNodeSelector(name string, selector map[string]string) map[string]string {
// Check if the selector is default.
selectorValue, ok := selector[ipfailover.DefaultName]
if ok && len(selector) == 1 && selectorValue == name {
return map[string]string{}
}
return selector
}
// GenerateDeploymentConfig generates an IP Failover deployment configuration.
func GenerateDeploymentConfig(name string, options *ipfailover.IPFailoverConfigCmdOptions, selector map[string]string) (*dapi.DeploymentConfig, error) {
containers, err := generateContainerConfig(name, options)
if err != nil {
return nil, err
}
podTemplate := &kapi.PodTemplateSpec{
ObjectMeta: kapi.ObjectMeta{Labels: selector},
Spec: kapi.PodSpec{
SecurityContext: &kapi.PodSecurityContext{
HostNetwork: true,
},
NodeSelector: generateNodeSelector(name, selector),
Containers: containers,
Volumes: generateVolumeConfig(),
ServiceAccountName: options.ServiceAccount,
},
}
return &dapi.DeploymentConfig{
ObjectMeta: kapi.ObjectMeta{
Name: name,
Labels: selector,
},
Spec: dapi.DeploymentConfigSpec{
Strategy: dapi.DeploymentStrategy{
Type: dapi.DeploymentStrategyTypeRecreate,
},
// TODO: v0.1 requires a manual resize of the
// replicas to match current cluster state.
// In the future, the PerNodeController in
// kubernetes would remove the need for this
// manual intervention.
Replicas: options.Replicas,
Selector: selector,
Template: podTemplate,
Triggers: []dapi.DeploymentTriggerPolicy{
{Type: dapi.DeploymentTriggerOnConfigChange},
},
},
}, nil
}