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config.go
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config.go
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package cloudforms
import (
"encoding/json"
"errors"
"fmt"
"net"
"strings"
"unicode/utf8"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/coreos/ipnets"
"github.com/coreos/tectonic-installer/installer/server/defaults"
)
const (
vpcLogicalName = "VPC"
defaultVPCCIDR = "10.0.0.0/16"
)
// SetDefaults sets Config default values (idempotent).
func (c *Config) SetDefaults() {
defInt := func(field *int, def int) {
if *field == 0 {
*field = def
}
}
defString := func(field *string, def string) {
if *field == "" {
*field = def
}
}
// Kubernetes
defString(&c.PodCIDR, defaults.PodCIDR)
defString(&c.ServiceCIDR, defaults.ServiceCIDR)
// AWS Cloud Formation
defString(&c.VPCCIDR, defaultVPCCIDR)
defInt(&c.ETCDCount, 3)
defString(&c.ETCDInstanceType, "m3.medium")
defString(&c.ETCDRootVolumeType, "gp2")
defInt(&c.ETCDRootVolumeIOPS, 0)
defInt(&c.ETCDRootVolumeSize, 30)
defInt(&c.ControllerCount, 1)
defString(&c.ControllerInstanceType, "t2.medium")
defString(&c.ControllerRootVolumeType, "gp2")
defInt(&c.ControllerRootVolumeIOPS, 0)
defInt(&c.ControllerRootVolumeSize, 30)
defInt(&c.WorkerCount, 2)
defString(&c.WorkerInstanceType, "t2.medium")
defString(&c.WorkerRootVolumeType, "gp2")
defInt(&c.WorkerRootVolumeIOPS, 0)
defInt(&c.WorkerRootVolumeSize, 30)
}
// GetDefaultSubnets partitions a CIDR into subnets
func GetDefaultSubnets(sess *session.Session, vpcCIDR string) ([]VPCSubnet, []VPCSubnet, error) {
zones, err := getAvailabilityZones(sess)
if err != nil {
return nil, nil, fmt.Errorf("failed getting availability zone %v", err)
}
_, vpcNet, err := net.ParseCIDR(vpcCIDR)
if vpcNet == nil || err != nil {
return nil, nil, fmt.Errorf("failed parsing VPC CIDR %v", err)
}
// Calculate subnetMultipler many times as many subnets as needed to
// intentionally leave unused IPs for unspecified use. A multipler
// of 1 divides the VPC among AZs, 2 leaves 50% of the VPC unallocated,
// 4 leaves 75% unallocated, etc.
cidrs, err := ipnets.SubnetInto(vpcNet, 2*2*len(zones))
if err != nil {
return nil, nil, fmt.Errorf("failed dividing VPC into subnets %v", err)
}
controllerSubnets := make([]VPCSubnet, len(zones))
workerSubnets := make([]VPCSubnet, len(zones))
// add generated multi-AZ subnets for controllers
for i, zone := range zones {
controllerSubnets[i] = VPCSubnet{
AvailabilityZone: zone,
InstanceCIDR: cidrs[i].String(),
}
}
// add generated multi-AZ subnets for workers
for i, zone := range zones {
workerSubnets[i] = VPCSubnet{
AvailabilityZone: zone,
InstanceCIDR: cidrs[i+len(zones)].String(),
}
}
return controllerSubnets, workerSubnets, nil
}
// SetComputed populates computed fields and may make calls to AWS endpoints.
func (c *Config) SetComputed(sess *session.Session) error {
c.SecureAPIServers = fmt.Sprintf("https://%s:443", c.ControllerDomain)
// Self-hosted Kubernetes IPs
var err error
c.APIServiceIP, err = defaults.APIServiceIP(c.ServiceCIDR)
if err != nil {
return err
}
c.DNSServiceIP, err = defaults.DNSServiceIP(c.ServiceCIDR)
if err != nil {
return err
}
// compute AMI from channel
if !(c.Channel == "stable" || c.Channel == "beta" || c.Channel == "alpha") {
return fmt.Errorf("channel must be stable, beta, or alpha, got %s", c.Channel)
}
if c.AMI, err = getAMI(c.Region, c.Channel); err != nil {
return fmt.Errorf("failed getting AMI for config: %v - %v: %v", c.Region, c.Channel, err)
}
controllerSubnets, workerSubnets, err := GetDefaultSubnets(sess, c.VPCCIDR)
if err != nil {
return err
}
if len(c.ControllerSubnets) == 0 {
c.ControllerSubnets = controllerSubnets
}
if len(c.WorkerSubnets) == 0 {
c.WorkerSubnets = workerSubnets
}
// determine whether to create new subnets in the stack formation and to give
// them indexed names
c.CreateControllerSubnets = false
for i := 0; i < len(c.ControllerSubnets); i++ {
if c.ControllerSubnets[i].ID == "" {
c.CreateControllerSubnets = true
if c.ControllerSubnets[i].Name == "" {
c.ControllerSubnets[i].Name = fmt.Sprintf("ControllerSubnet%d", i)
}
}
}
c.CreateWorkerSubnets = false
for i := 0; i < len(c.WorkerSubnets); i++ {
if c.WorkerSubnets[i].ID == "" {
c.CreateWorkerSubnets = true
if c.WorkerSubnets[i].Name == "" {
c.WorkerSubnets[i].Name = fmt.Sprintf("WorkerSubnet%d", i)
}
}
}
// retrieve the hosted zone name
c.HostedZoneName, err = getHostedZoneName(sess, c.HostedZoneID)
if err != nil {
return err
}
if c.ExternalETCDClient == "" {
c.ETCDInstances, c.ETCDInitialCluster, c.ETCDEndpoints = PopulateETCDInstances(
c.ClusterName,
c.HostedZoneName,
c.WorkerSubnets,
c.ETCDCount,
)
} else {
c.ETCDEndpoints = c.ExternalETCDClient
}
err = PopulateCIDRs(sess, c.VPCID, c.ControllerSubnets, c.WorkerSubnets)
if err != nil {
return err
}
// set logical name constants
c.VPCLogicalName = vpcLogicalName
c.InternetGatewayLogicalName = "VPCInternetGateway"
// default to creating VPC / gateway with logical name
c.VPCRef = fmt.Sprintf(`{ "Ref" : %q }`, c.VPCLogicalName)
c.InternetGatewayRef = fmt.Sprintf(`{ "Ref" : %q}`, c.InternetGatewayLogicalName)
// for existing VPC, set the VPC and internet gateway references to use
if c.VPCID != "" {
gateway, err := getInternetGateway(sess, c.VPCID)
if err != nil {
return err
}
c.VPCRef = fmt.Sprintf("%q", c.VPCID)
c.InternetGatewayRef = fmt.Sprintf("%q", aws.StringValue(gateway.InternetGatewayId))
}
return nil
}
// PopulateETCDInstances initializes a slice of ETCDInstance, with the
// corresponding initial-cluster and endpoint variables.
func PopulateETCDInstances(clusterName, hostedZoneName string, subnets []VPCSubnet, count int) (instances []ETCDInstance, initialCluster, endpoints string) {
var endpointsS, initialClusterS []string
for i := 0; i < count; i++ {
domainName := fmt.Sprintf("%s-etcd-%d.%s", clusterName, i, hostedZoneName)
instances = append(instances, ETCDInstance{
Name: fmt.Sprintf("etcd%d", i),
DomainName: domainName,
Subnet: subnets[i%len(subnets)],
})
endpointsS = append(endpointsS, domainName+":2379")
initialClusterS = append(initialClusterS, fmt.Sprintf("etcd%d=http://%s:2380", i, domainName))
}
endpoints = strings.Join(endpointsS, ",")
initialCluster = strings.Join(initialClusterS, ",")
return
}
// PopulateCIDRs shoves some CIDRs into subnets when we know the IDs
func PopulateCIDRs(sess *session.Session, existingVPCID string, publicSubnets, privateSubnets []VPCSubnet) error {
existingPublicSubnets, existingPrivateSubnets, err := GetVPCSubnets(sess, existingVPCID)
if err != nil {
return err
}
existingSubnets := append(existingPublicSubnets, existingPrivateSubnets...)
for i, subnet := range publicSubnets {
if subnet.ID == "" || subnet.InstanceCIDR != "" {
continue
}
for _, existing := range existingSubnets {
if subnet.ID == existing.ID {
publicSubnets[i].InstanceCIDR = existing.InstanceCIDR
break
}
}
}
for i, subnet := range privateSubnets {
if subnet.ID == "" || subnet.InstanceCIDR != "" {
continue
}
for _, existing := range existingSubnets {
if subnet.ID == existing.ID {
privateSubnets[i].InstanceCIDR = existing.InstanceCIDR
break
}
}
}
return nil
}
// Valid returns true if the cloudform Config is valid.
func (c *Config) Valid() error {
if c.ELBScheme != "internet-facing" && c.ELBScheme != "internal" {
return errors.New("elbScheme must be either 'internet-facing' or 'internal'")
}
if c.ControllerDomain == "" {
return errors.New("controllerDomain must be set")
}
if c.TectonicDomain == "" {
return errors.New("tectonicDomain must be set")
}
if c.HostedZoneID == "" {
return errors.New("hostedZoneID must be specified")
}
if c.KeyName == "" {
return errors.New("keyName must be set")
}
if c.Region == "" {
return errors.New("region must be set")
}
if len(c.ClusterName) == 0 || len(c.ClusterName) > 28 {
return errors.New("clusterName must be between 1 and 28 characters")
}
if c.KMSKeyARN == "" {
return errors.New("kmsKeyArn must be set")
}
if c.VPCID == "" && c.RouteTableID != "" {
return errors.New("vpcId must be specified if routeTableId is specified")
}
_, vpcNet, err := net.ParseCIDR(c.VPCCIDR)
if err != nil {
return fmt.Errorf("invalid vpcCIDR: %v", err)
}
// pod network / vpc overlap
_, podNet, err := net.ParseCIDR(c.PodCIDR)
if err != nil {
return fmt.Errorf("invalid podCIDR: %v", err)
}
if cidrOverlap(podNet, vpcNet) {
return fmt.Errorf("vpcCIDR (%s) overlaps with podCIDR (%s)", c.VPCCIDR, c.PodCIDR)
}
// service / vpc network overlap
_, serviceNet, err := net.ParseCIDR(c.ServiceCIDR)
if err != nil {
return fmt.Errorf("invalid serviceCIDR: %v", err)
}
if cidrOverlap(serviceNet, vpcNet) {
return fmt.Errorf("vpcCIDR (%s) overlaps with serviceCIDR (%s)", c.VPCCIDR, c.ServiceCIDR)
}
// service / pod network overlap
if cidrOverlap(serviceNet, podNet) {
return fmt.Errorf("serviceCIDR (%s) overlaps with podCIDR (%s)", c.ServiceCIDR, c.PodCIDR)
}
if c.ControllerRootVolumeType == "io1" {
if c.ControllerRootVolumeIOPS < 100 || c.ControllerRootVolumeIOPS > 2000 {
return fmt.Errorf("invalid controllerRootVolumeIOPS: %d", c.ControllerRootVolumeIOPS)
}
} else {
if c.ControllerRootVolumeIOPS != 0 {
return fmt.Errorf("invalid controllerRootVolumeIOPS for volume type '%s': %d", c.ControllerRootVolumeType, c.ControllerRootVolumeIOPS)
}
if c.ControllerRootVolumeType != "standard" && c.ControllerRootVolumeType != "gp2" {
return fmt.Errorf("invalid controllerRootVolumeType: %s", c.ControllerRootVolumeType)
}
}
if c.WorkerRootVolumeType == "io1" {
if c.WorkerRootVolumeIOPS < 100 || c.WorkerRootVolumeIOPS > 2000 {
return fmt.Errorf("invalid workerRootVolumeIOPS: %d", c.WorkerRootVolumeIOPS)
}
} else {
if c.WorkerRootVolumeIOPS != 0 {
return fmt.Errorf("invalid workerRootVolumeIOPS for volume type '%s': %d", c.WorkerRootVolumeType, c.WorkerRootVolumeIOPS)
}
if c.WorkerRootVolumeType != "standard" && c.WorkerRootVolumeType != "gp2" {
return fmt.Errorf("invalid workerRootVolumeType: %s", c.WorkerRootVolumeType)
}
}
return nil
}
/*
Returns the availability zones referenced by the cluster configuration
*/
func (c *Config) availabilityZones() []string {
azs := make([]string, len(c.ControllerSubnets))
for i := range azs {
azs[i] = c.ControllerSubnets[i].AvailabilityZone
}
return azs
}
// ValidateJSON returns detailed JSON validation errors.
func validateJSON(data []byte) error {
// use unmarshal function to do syntax validation
var jsonHolder map[string]interface{}
if err := json.Unmarshal(data, &jsonHolder); err != nil {
// attempt to provide more detail
syntaxError, ok := err.(*json.SyntaxError)
if ok {
contextString := getContextString(data, int(syntaxError.Offset), 3)
return fmt.Errorf("%v:\njson syntax error (offset=%d), in this region:\n-------\n%s\n-------\n", err, syntaxError.Offset, contextString)
}
return err
}
return nil
}
func getContextString(buf []byte, offset, lineCount int) string {
linesSeen := 0
var leftLimit int
for leftLimit = offset; leftLimit > 0 && linesSeen <= lineCount; leftLimit-- {
if buf[leftLimit] == '\n' {
linesSeen++
}
}
linesSeen = 0
var rightLimit int
for rightLimit = offset + 1; rightLimit < len(buf) && linesSeen <= lineCount; rightLimit++ {
if buf[rightLimit] == '\n' {
linesSeen++
}
}
return string(buf[leftLimit:rightLimit])
}
// Does the address space of these networks "a" and "b" overlap?
func cidrOverlap(a, b *net.IPNet) bool {
return a.Contains(b.IP) || b.Contains(a.IP)
}
func withTrailingDot(s string) string {
if s == "" {
return s
}
lastRune, _ := utf8.DecodeLastRuneInString(s)
if lastRune != rune('.') {
return s + "."
}
return s
}