/
main.go
207 lines (199 loc) · 6.4 KB
/
main.go
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package main
import (
"flag"
"fmt"
"os"
"path/filepath"
"strings"
"syscall"
"github.com/Cloud-Foundations/Dominator/hypervisor/dhcpd"
"github.com/Cloud-Foundations/Dominator/hypervisor/httpd"
"github.com/Cloud-Foundations/Dominator/hypervisor/manager"
"github.com/Cloud-Foundations/Dominator/hypervisor/metadatad"
"github.com/Cloud-Foundations/Dominator/hypervisor/rpcd"
"github.com/Cloud-Foundations/Dominator/hypervisor/tftpbootd"
"github.com/Cloud-Foundations/Dominator/lib/constants"
"github.com/Cloud-Foundations/Dominator/lib/flags/loadflags"
"github.com/Cloud-Foundations/Dominator/lib/flagutil"
"github.com/Cloud-Foundations/Dominator/lib/log/serverlogger"
"github.com/Cloud-Foundations/Dominator/lib/net"
"github.com/Cloud-Foundations/Dominator/lib/srpc"
"github.com/Cloud-Foundations/Dominator/lib/srpc/setupserver"
"github.com/Cloud-Foundations/tricorder/go/tricorder"
)
const (
dirPerms = syscall.S_IRWXU | syscall.S_IRGRP | syscall.S_IXGRP |
syscall.S_IROTH | syscall.S_IXOTH
)
var (
dhcpServerOnBridgesOnly = flag.Bool("dhcpServerOnBridgesOnly", false,
"If true, run the DHCP server on bridge interfaces only")
imageServerHostname = flag.String("imageServerHostname", "localhost",
"Hostname of image server")
imageServerPortNum = flag.Uint("imageServerPortNum",
constants.ImageServerPortNumber,
"Port number of image server")
networkBootImage = flag.String("networkBootImage", "pxelinux.0",
"Name of boot image passed via DHCP option")
objectCacheSize = flagutil.Size(10 << 30)
portNum = flag.Uint("portNum", constants.HypervisorPortNumber,
"Port number to allocate and listen on for HTTP/RPC")
showVGA = flag.Bool("showVGA", false, "If true, show VGA console")
stateDir = flag.String("stateDir", "/var/lib/hypervisor",
"Name of state directory")
testMemoryAvailable = flag.Uint64("testMemoryAvailable", 0,
"test if memory is allocatable and exit (units of MiB)")
tftpbootImageStream = flag.String("tftpbootImageStream", "",
"Name of default image stream for network booting")
username = flag.String("username", "nobody",
"Name of user to run VMs")
volumeDirectories flagutil.StringList
)
func init() {
flag.Var(&objectCacheSize, "objectCacheSize",
"maximum size of object cache")
flag.Var(&volumeDirectories, "volumeDirectories",
"Comma separated list of volume directories. If empty, scan for space")
}
func printUsage() {
fmt.Fprintln(os.Stderr,
"Usage: hypervisor [flags...] [run|stop|stop-vms-on-next-stop]")
fmt.Fprintln(os.Stderr, "Common flags:")
flag.PrintDefaults()
}
func processCommand(args []string) {
if len(args) < 1 {
return
} else if len(args) > 1 {
printUsage()
os.Exit(2)
}
switch args[0] {
case "run":
return
case "stop":
requestStop()
case "stop-vms-on-next-stop":
configureVMsToStopOnNextStop()
default:
printUsage()
os.Exit(2)
}
}
func main() {
if err := loadflags.LoadForDaemon("hypervisor"); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
flag.Usage = printUsage
flag.Parse()
processCommand(flag.Args())
if *testMemoryAvailable > 0 {
nBytes := *testMemoryAvailable << 20
mem := make([]byte, nBytes)
for pos := uint64(0); pos < nBytes; pos += 4096 {
mem[pos] = 0
}
os.Exit(0)
}
tricorder.RegisterFlags()
if os.Geteuid() != 0 {
fmt.Fprintln(os.Stderr, "Must run the Hypervisor as root")
os.Exit(1)
}
logger := serverlogger.New("")
srpc.SetDefaultLogger(logger)
params := setupserver.Params{Logger: logger}
if err := setupserver.SetupTlsWithParams(params); err != nil {
logger.Fatalln(err)
}
if err := os.MkdirAll(*stateDir, dirPerms); err != nil {
logger.Fatalf("Cannot create state directory: %s\n", err)
}
bridges, bridgeMap, err := net.ListBroadcastInterfaces(
net.InterfaceTypeBridge, logger)
if err != nil {
logger.Fatalf("Cannot list bridges: %s\n", err)
}
dhcpInterfaces := make([]string, 0, len(bridges))
vlanIdToBridge := make(map[uint]string)
for _, bridge := range bridges {
vlanId, err := net.GetBridgeVlanId(bridge.Name)
if err != nil {
logger.Fatalf("Cannot get VLAN Id for bridge: %s: %s\n",
bridge.Name, err)
continue
}
if vlanId < 0 {
if len(bridges) > 1 {
logger.Printf("Bridge: %s has no EtherNet port, ignoring\n",
bridge.Name)
continue
}
logger.Printf(
"Bridge: %s has no EtherNet port but is the only bridge, using in hope\n",
bridge.Name)
vlanId = 0
}
if *dhcpServerOnBridgesOnly {
dhcpInterfaces = append(dhcpInterfaces, bridge.Name)
}
if !strings.HasPrefix(bridge.Name, "br@") {
vlanIdToBridge[uint(vlanId)] = bridge.Name
logger.Printf("Bridge: %s, VLAN Id: %d\n", bridge.Name, vlanId)
}
}
dhcpServer, err := dhcpd.New(dhcpInterfaces,
filepath.Join(*stateDir, "dynamic-leases.json"), logger)
if err != nil {
logger.Fatalf("Cannot start DHCP server: %s\n", err)
}
if err := dhcpServer.SetNetworkBootImage(*networkBootImage); err != nil {
logger.Fatalf("Cannot set NetworkBootImage name: %s\n", err)
}
imageServerAddress := fmt.Sprintf("%s:%d",
*imageServerHostname, *imageServerPortNum)
tftpbootServer, err := tftpbootd.New(imageServerAddress,
*tftpbootImageStream, logger)
if err != nil {
logger.Fatalf("Cannot start tftpboot server: %s\n", err)
}
managerObj, err := manager.New(manager.StartOptions{
BridgeMap: bridgeMap,
DhcpServer: dhcpServer,
ImageServerAddress: imageServerAddress,
Logger: logger,
ObjectCacheBytes: uint64(objectCacheSize),
ShowVgaConsole: *showVGA,
StateDir: *stateDir,
Username: *username,
VlanIdToBridge: vlanIdToBridge,
VolumeDirectories: volumeDirectories,
})
if err != nil {
logger.Fatalf("Cannot start hypervisor: %s\n", err)
}
if err := listenForControl(managerObj, logger); err != nil {
logger.Fatalf("Cannot listen for control: %s\n", err)
}
httpd.AddHtmlWriter(managerObj)
if len(bridges) < 1 {
logger.Println("No bridges found: entering log-only mode")
} else {
httpd.AddHtmlWriter(dhcpServer)
rpcHtmlWriter, err := rpcd.Setup(managerObj, dhcpServer, tftpbootServer,
logger)
if err != nil {
logger.Fatalf("Cannot start rpcd: %s\n", err)
}
httpd.AddHtmlWriter(rpcHtmlWriter)
}
httpd.AddHtmlWriter(logger)
err = metadatad.StartServer(*portNum, bridges, managerObj, logger)
if err != nil {
logger.Fatalf("Cannot start metadata server: %s\n", err)
}
if err := httpd.StartServer(*portNum, managerObj, false); err != nil {
logger.Fatalf("Unable to create http server: %s\n", err)
}
}