// New returns a new DB object.
func New() *DB {
db := &DB{l: newLogger()}
cli := gentleman.New()
cli.Use(retry.New(retrier.New(retrier.ExponentialBackoff(3, 100*time.Millisecond), nil)))
cli.UseRequest(func(ctx *context.Context, h context.Handler) {
u, err := url.Parse(db.url)
if err != nil {
h.Error(ctx, err)
return
}
ctx.Request.URL.Scheme = u.Scheme
ctx.Request.URL.Host = u.Host
ctx.Request.URL.Path = db.dbPath()
h.Next(ctx)
})
cli.UseRequest(func(ctx *context.Context, h context.Handler) {
ctx.Request.SetBasicAuth(db.username, db.password)
h.Next(ctx)
})
db.conn = cli
return db
}
func readPid(pidFilePath string) (int, error) {
retrier := retrier.New(retrier.ConstantBackoff(20, 500*time.Millisecond), nil)
var (
pid int = -1
err error
)
retrier.Run(func() error {
pid, err = parsePid(pidFilePath)
return err
})
return pid, err
}
func (r *RunningGarden) Cleanup() {
// unmount aufs since the docker graph driver leaves this around,
// otherwise the following commands might fail
retry := retrier.New(retrier.ConstantBackoff(200, 500*time.Millisecond), nil)
err := retry.Run(func() error {
if err := os.RemoveAll(path.Join(r.GraphPath, "aufs")); err == nil {
return nil // if we can remove it, it's already unmounted
}
if err := syscall.Unmount(path.Join(r.GraphPath, "aufs"), MNT_DETACH); err != nil {
r.logger.Error("failed-unmount-attempt", err)
return err
}
return nil
})
if err != nil {
r.logger.Error("failed-to-unmount", err)
}
MustUnmountTmpfs(r.GraphPath)
// In the kernel version 3.19.0-51-generic the code bellow results in
// hanging the running VM. We are not deleting the node-X directories. They
// are empty and the next test will re-use them. We will stick with that
// workaround until we can test on a newer kernel that will hopefully not
// have this bug.
//
// if err := os.RemoveAll(r.GraphPath); err != nil {
// r.logger.Error("remove-graph", err)
// }
r.logger.Info("cleanup-tempdirs")
if err := os.RemoveAll(r.Tmpdir); err != nil {
r.logger.Error("cleanup-tempdirs-failed", err, lager.Data{"tmpdir": r.Tmpdir})
} else {
r.logger.Info("tempdirs-removed")
}
}
func (cmd *GuardianCommand) wireContainerizer(log lager.Logger, depotPath, dadooPath, runcPath, nstarPath, tarPath, defaultRootFSPath, appArmorProfile string, properties gardener.PropertyManager) *rundmc.Containerizer {
depot := depot.New(depotPath)
commandRunner := linux_command_runner.New()
chrootMkdir := bundlerules.ChrootMkdir{
Command: preparerootfs.Command,
CommandRunner: commandRunner,
}
pidFileReader := &dadoo.PidFileReader{
Clock: clock.NewClock(),
Timeout: 10 * time.Second,
SleepInterval: time.Millisecond * 100,
}
runcrunner := runrunc.New(
commandRunner,
runrunc.NewLogRunner(commandRunner, runrunc.LogDir(os.TempDir()).GenerateLogFile),
goci.RuncBinary(runcPath),
dadooPath,
runcPath,
runrunc.NewExecPreparer(&goci.BndlLoader{}, runrunc.LookupFunc(runrunc.LookupUser), chrootMkdir, NonRootMaxCaps),
dadoo.NewExecRunner(
dadooPath,
runcPath,
cmd.wireUidGenerator(),
pidFileReader,
linux_command_runner.New()),
)
mounts := []specs.Mount{
{Type: "sysfs", Source: "sysfs", Destination: "/sys", Options: []string{"nosuid", "noexec", "nodev", "ro"}},
{Type: "tmpfs", Source: "tmpfs", Destination: "/dev/shm"},
{Type: "devpts", Source: "devpts", Destination: "/dev/pts",
Options: []string{"nosuid", "noexec", "newinstance", "ptmxmode=0666", "mode=0620"}},
{Type: "bind", Source: cmd.Bin.Init.Path(), Destination: "/tmp/garden-init", Options: []string{"bind"}},
}
privilegedMounts := append(mounts,
specs.Mount{Type: "proc", Source: "proc", Destination: "/proc", Options: []string{"nosuid", "noexec", "nodev"}},
)
unprivilegedMounts := append(mounts,
specs.Mount{Type: "proc", Source: "proc", Destination: "/proc", Options: []string{"nosuid", "noexec", "nodev"}},
)
rwm := "rwm"
character := "c"
var majorMinor = func(i int64) *int64 {
return &i
}
var worldReadWrite os.FileMode = 0666
fuseDevice := specs.LinuxDevice{
Path: "/dev/fuse",
Type: "c",
Major: 10,
Minor: 229,
FileMode: &worldReadWrite,
}
denyAll := specs.LinuxDeviceCgroup{Allow: false, Access: &rwm}
allowedDevices := []specs.LinuxDeviceCgroup{
{Access: &rwm, Type: &character, Major: majorMinor(1), Minor: majorMinor(3), Allow: true},
{Access: &rwm, Type: &character, Major: majorMinor(5), Minor: majorMinor(0), Allow: true},
{Access: &rwm, Type: &character, Major: majorMinor(1), Minor: majorMinor(8), Allow: true},
{Access: &rwm, Type: &character, Major: majorMinor(1), Minor: majorMinor(9), Allow: true},
{Access: &rwm, Type: &character, Major: majorMinor(1), Minor: majorMinor(5), Allow: true},
{Access: &rwm, Type: &character, Major: majorMinor(1), Minor: majorMinor(7), Allow: true},
{Access: &rwm, Type: &character, Major: majorMinor(1), Minor: majorMinor(7), Allow: true},
{Access: &rwm, Type: &character, Major: majorMinor(fuseDevice.Major), Minor: majorMinor(fuseDevice.Minor), Allow: true},
}
baseProcess := specs.Process{
Capabilities: UnprivilegedMaxCaps,
Args: []string{"/tmp/garden-init"},
Cwd: "/",
}
baseBundle := goci.Bundle().
WithNamespaces(PrivilegedContainerNamespaces...).
WithResources(&specs.LinuxResources{Devices: append([]specs.LinuxDeviceCgroup{denyAll}, allowedDevices...)}).
WithRootFS(defaultRootFSPath).
WithDevices(fuseDevice).
WithProcess(baseProcess)
unprivilegedBundle := baseBundle.
WithNamespace(goci.UserNamespace).
WithUIDMappings(idMappings...).
WithGIDMappings(idMappings...).
WithMounts(unprivilegedMounts...).
WithMaskedPaths(defaultMaskedPaths())
unprivilegedBundle.Spec.Linux.Seccomp = seccomp
if appArmorProfile != "" {
unprivilegedBundle.Spec.Process.ApparmorProfile = appArmorProfile
}
privilegedBundle := baseBundle.
WithMounts(privilegedMounts...).
WithCapabilities(PrivilegedMaxCaps...)
template := &rundmc.BundleTemplate{
Rules: []rundmc.BundlerRule{
bundlerules.Base{
PrivilegedBase: privilegedBundle,
UnprivilegedBase: unprivilegedBundle,
},
bundlerules.RootFS{
ContainerRootUID: idMappings.Map(0),
ContainerRootGID: idMappings.Map(0),
MkdirChown: chrootMkdir,
},
bundlerules.Limits{},
bundlerules.BindMounts{},
bundlerules.Env{},
bundlerules.Hostname{},
},
}
log.Info("base-bundles", lager.Data{
"privileged": privilegedBundle,
"unprivileged": unprivilegedBundle,
})
eventStore := rundmc.NewEventStore(properties)
stateStore := rundmc.NewStateStore(properties)
nstar := rundmc.NewNstarRunner(nstarPath, tarPath, linux_command_runner.New())
stopper := stopper.New(stopper.NewRuncStateCgroupPathResolver("/run/runc"), nil, retrier.New(retrier.ConstantBackoff(10, 1*time.Second), nil))
return rundmc.New(depot, template, runcrunner, &goci.BndlLoader{}, nstar, stopper, eventStore, stateStore)
}
func (cmd *GuardianCommand) wireVolumeCreator(logger lager.Logger, graphRoot string, insecureRegistries, persistentImages []string) gardener.VolumeCreator {
if graphRoot == "" {
return gardener.NoopVolumeCreator{}
}
if cmd.Bin.ImagePlugin.Path() != "" {
defaultRootFS, err := url.Parse(cmd.Containers.DefaultRootFSDir.Path())
if err != nil {
logger.Fatal("failed-to-parse-default-rootfs", err)
}
return imageplugin.New(cmd.Bin.ImagePlugin.Path(), linux_command_runner.New(), defaultRootFS, idMappings)
}
logger = logger.Session("volume-creator", lager.Data{"graphRoot": graphRoot})
runner := &logging.Runner{CommandRunner: linux_command_runner.New(), Logger: logger}
if err := os.MkdirAll(graphRoot, 0755); err != nil {
logger.Fatal("failed-to-create-graph-directory", err)
}
dockerGraphDriver, err := graphdriver.New(graphRoot, nil)
if err != nil {
logger.Fatal("failed-to-construct-graph-driver", err)
}
backingStoresPath := filepath.Join(graphRoot, "backing_stores")
if err := os.MkdirAll(backingStoresPath, 0660); err != nil {
logger.Fatal("failed-to-mkdir-backing-stores", err)
}
quotaedGraphDriver := "aed_aufs.QuotaedDriver{
GraphDriver: dockerGraphDriver,
Unmount: quotaed_aufs.Unmount,
BackingStoreMgr: "aed_aufs.BackingStore{
RootPath: backingStoresPath,
Logger: logger.Session("backing-store-mgr"),
},
LoopMounter: "aed_aufs.Loop{
Retrier: retrier.New(retrier.ConstantBackoff(200, 500*time.Millisecond), nil),
Logger: logger.Session("loop-mounter"),
},
Retrier: retrier.New(retrier.ConstantBackoff(200, 500*time.Millisecond), nil),
RootPath: graphRoot,
Logger: logger.Session("quotaed-driver"),
}
dockerGraph, err := graph.NewGraph(graphRoot, quotaedGraphDriver)
if err != nil {
logger.Fatal("failed-to-construct-graph", err)
}
var cake layercake.Cake = &layercake.Docker{
Graph: dockerGraph,
Driver: quotaedGraphDriver,
}
if cake.DriverName() == "aufs" {
cake = &layercake.AufsCake{
Cake: cake,
Runner: runner,
GraphRoot: graphRoot,
}
}
repoFetcher := repository_fetcher.Retryable{
RepositoryFetcher: &repository_fetcher.CompositeFetcher{
LocalFetcher: &repository_fetcher.Local{
Cake: cake,
DefaultRootFSPath: cmd.Containers.DefaultRootFSDir.Path(),
IDProvider: repository_fetcher.LayerIDProvider{},
},
RemoteFetcher: repository_fetcher.NewRemote(
logger,
cmd.Docker.Registry,
cake,
distclient.NewDialer(insecureRegistries),
repository_fetcher.VerifyFunc(repository_fetcher.Verify),
),
},
Logger: logger,
}
rootFSNamespacer := &rootfs_provider.UidNamespacer{
Translator: rootfs_provider.NewUidTranslator(
idMappings, // uid
idMappings, // gid
),
}
retainer := cleaner.NewRetainer()
ovenCleaner := cleaner.NewOvenCleaner(retainer,
cleaner.NewThreshold(int64(cmd.Graph.CleanupThresholdInMegabytes)*1024*1024),
)
imageRetainer := &repository_fetcher.ImageRetainer{
GraphRetainer: retainer,
DirectoryRootfsIDProvider: repository_fetcher.LayerIDProvider{},
DockerImageIDFetcher: repoFetcher,
NamespaceCacheKey: rootFSNamespacer.CacheKey(),
Logger: logger,
}
// spawn off in a go function to avoid blocking startup
// worst case is if an image is immediately created and deleted faster than
// we can retain it we'll garbage collect it when we shouldn't. This
// is an OK trade-off for not having garden startup block on dockerhub.
go imageRetainer.Retain(persistentImages)
layerCreator := rootfs_provider.NewLayerCreator(cake, rootfs_provider.SimpleVolumeCreator{}, rootFSNamespacer)
quotaManager := "a_manager.AUFSQuotaManager{
BaseSizer: quota_manager.NewAUFSBaseSizer(cake),
DiffSizer: "a_manager.AUFSDiffSizer{
AUFSDiffPathFinder: quotaedGraphDriver,
},
}
return rootfs_provider.NewCakeOrdinator(cake,
repoFetcher,
layerCreator,
rootfs_provider.NewMetricsAdapter(quotaManager.GetUsage, quotaedGraphDriver.GetMntPath),
ovenCleaner)
}
package devices
import (
"fmt"
"net"
"sync"
"time"
"github.com/docker/libcontainer/netlink"
"github.com/eapache/go-resiliency/retrier"
)
// netlink is not thread-safe, all calls to netlink should be guarded by this mutex
var netlinkMu *sync.Mutex = new(sync.Mutex)
var retry = retrier.New(retrier.ExponentialBackoff(6, 10*time.Millisecond), nil)
type Bridge struct{}
// Create creates a bridge device and returns the interface.
// If the device already exists, returns the existing interface.
func (Bridge) Create(name string, ip net.IP, subnet *net.IPNet) (intf *net.Interface, err error) {
netlinkMu.Lock()
defer netlinkMu.Unlock()
if intf, err = idempotentlyCreateBridge(name); err != nil {
return nil, err
}
if err = netlink.NetworkLinkAddIp(intf, ip, subnet); err != nil && err.Error() != "file exists" {
return nil, fmt.Errorf("devices: add IP to bridge: %v", err)
func main() {
if reexec.Init() {
return
}
var insecureRegistries vars.StringList
flag.Var(
&insecureRegistries,
"insecureDockerRegistry",
"Docker registry to allow connecting to even if not secure. (Can be specified multiple times to allow insecure connection to multiple repositories)",
)
var persistentImages vars.StringList
flag.Var(
&persistentImages,
"persistentImage",
"Image which should never be garbage collected. (Can be specified multiple times)",
)
var dnsServers vars.StringList
flag.Var(
&dnsServers,
"dnsServer",
"DNS server IP address to use instead of automatically determined servers. (Can be specified multiple times)",
)
cf_debug_server.AddFlags(flag.CommandLine)
cf_lager.AddFlags(flag.CommandLine)
flag.Parse()
runtime.GOMAXPROCS(runtime.NumCPU())
logger, reconfigurableSink := cf_lager.New("garden-linux")
initializeDropsonde(logger)
if *binPath == "" {
missing("-bin")
}
if *stateDirPath == "" {
missing("-stateDir")
}
if *depotPath == "" {
missing("-depot")
}
if len(*tag) > 2 {
println("-tag parameter must be less than 3 characters long")
println()
flag.Usage()
return
}
_, dynamicRange, err := net.ParseCIDR(*networkPool)
if err != nil {
logger.Fatal("failed-to-parse-network-pool", err)
}
subnetPool, err := subnets.NewSubnets(dynamicRange)
if err != nil {
logger.Fatal("failed-to-create-subnet-pool", err)
}
portPoolState, err := port_pool.LoadState(path.Join(*stateDirPath, "port_pool.json"))
if err != nil {
logger.Error("failed-to-parse-pool-state", err)
}
// TODO: use /proc/sys/net/ipv4/ip_local_port_range by default (end + 1)
portPool, err := port_pool.New(uint32(*portPoolStart), uint32(*portPoolSize), portPoolState)
if err != nil {
logger.Fatal("invalid pool range", err)
}
useKernelLogging := true
switch *iptablesLogMethod {
case "nflog":
useKernelLogging = false
case "kernel":
/* noop */
default:
println("-iptablesLogMethod value not recognized")
println()
flag.Usage()
return
}
config := sysconfig.NewConfig(*tag, *allowHostAccess, dnsServers.List)
runner := sysconfig.NewRunner(config, linux_command_runner.New())
if err := os.MkdirAll(*graphRoot, 0755); err != nil {
logger.Fatal("failed-to-create-graph-directory", err)
}
dockerGraphDriver, err := selectGraphDriver(logger, *graphDriverName, *graphRoot)
if err != nil {
logger.Fatal("failed-to-construct-graph-driver", err)
}
backingStoresPath := filepath.Join(*graphRoot, "backing_stores")
if err := os.MkdirAll(backingStoresPath, 0660); err != nil {
logger.Fatal("failed-to-mkdir-backing-stores", err)
}
quotaedGraphDriver := "aed_aufs.QuotaedDriver{
GraphDriver: dockerGraphDriver,
Unmount: quotaed_aufs.Unmount,
BackingStoreMgr: "aed_aufs.BackingStore{
RootPath: backingStoresPath,
Logger: logger.Session("backing-store-mgr"),
},
LoopMounter: "aed_aufs.Loop{
Retrier: retrier.New(retrier.ConstantBackoff(200, 500*time.Millisecond), nil),
Logger: logger.Session("loop-mounter"),
},
Retrier: retrier.New(retrier.ConstantBackoff(200, 500*time.Millisecond), nil),
RootPath: *graphRoot,
Logger: logger.Session("quotaed-driver"),
}
metricsProvider := metrics.NewMetrics(logger, backingStoresPath, *depotPath)
if dbgAddr := cf_debug_server.DebugAddress(flag.CommandLine); dbgAddr != "" {
metrics.StartDebugServer(dbgAddr, reconfigurableSink, metricsProvider)
}
dockerGraph, err := graph.NewGraph(*graphRoot, quotaedGraphDriver)
if err != nil {
logger.Fatal("failed-to-construct-graph", err)
}
var cake layercake.Cake = &layercake.Docker{
Graph: dockerGraph,
Driver: quotaedGraphDriver,
}
if cake.DriverName() == "aufs" {
cake = &layercake.AufsCake{
Cake: cake,
Runner: runner,
GraphRoot: *graphRoot,
}
}
repo := container_repository.New()
retainer := cleaner.NewRetainer()
repoFetcher := &repository_fetcher.Retryable{
RepositoryFetcher: &repository_fetcher.CompositeFetcher{
LocalFetcher: &repository_fetcher.Local{
Cake: cake,
DefaultRootFSPath: *rootFSPath,
IDProvider: repository_fetcher.LayerIDProvider{},
},
RemoteFetcher: repository_fetcher.NewRemote(
logger,
*dockerRegistry,
cake,
distclient.NewDialer(insecureRegistries.List),
repository_fetcher.VerifyFunc(repository_fetcher.Verify),
),
},
Logger: logger,
}
maxId := uint32(sysinfo.Min(sysinfo.MustGetMaxValidUID(), sysinfo.MustGetMaxValidGID()))
mappingList := rootfs_provider.MappingList{
{
ContainerID: 0,
HostID: maxId,
Size: 1,
},
{
ContainerID: 1,
HostID: 1,
Size: maxId - 1,
},
}
rootFSNamespacer := &rootfs_provider.UidNamespacer{
Logger: logger,
Translator: rootfs_provider.NewUidTranslator(
mappingList, // uid
mappingList, // gid
),
}
cleaner := cleaner.NewOvenCleaner(
retainer,
cleaner.NewThreshold(int64(*graphCleanupThreshold)*1024*1024),
)
layerCreator := rootfs_provider.NewLayerCreator(cake, rootfs_provider.SimpleVolumeCreator{}, rootFSNamespacer)
cakeOrdinator := rootfs_provider.NewCakeOrdinator(cake, repoFetcher, layerCreator, nil, cleaner)
imageRetainer := &repository_fetcher.ImageRetainer{
GraphRetainer: retainer,
DirectoryRootfsIDProvider: repository_fetcher.LayerIDProvider{},
DockerImageIDFetcher: repoFetcher,
NamespaceCacheKey: rootFSNamespacer.CacheKey(),
Logger: logger,
}
// spawn off in a go function to avoid blocking startup
// worst case is if an image is immediately created and deleted faster than
// we can retain it we'll garbage collect it when we shouldn't. This
// is an OK trade-off for not having garden startup block on dockerhub.
go imageRetainer.Retain(persistentImages.List)
rootfsCleaner := &linux_backend.RootFSCleaner{
FilePaths: []string{
"/tmp", "/proc", "/sys", "/dev", "/etc", "/etc/config", "/etc/hostname",
"/etc/hosts", "/etc/resolv.conf",
},
}
if *externalIP == "" {
ip, err := localip.LocalIP()
if err != nil {
panic("couldn't determine local IP to use for -externalIP parameter. You can use the -externalIP flag to pass an external IP")
}
externalIP = &ip
}
parsedExternalIP := net.ParseIP(*externalIP)
if parsedExternalIP == nil {
panic(fmt.Sprintf("Value of -externalIP %s could not be converted to an IP", *externalIP))
}
var quotaManager linux_container.QuotaManager = "a_manager.AUFSQuotaManager{
BaseSizer: quota_manager.NewAUFSBaseSizer(cake),
DiffSizer: "a_manager.AUFSDiffSizer{quotaedGraphDriver},
}
ipTablesMgr := createIPTablesManager(config, runner, logger)
injector := &provider{
useKernelLogging: useKernelLogging,
chainPrefix: config.IPTables.Filter.InstancePrefix,
runner: runner,
log: logger,
portPool: portPool,
ipTablesMgr: ipTablesMgr,
sysconfig: config,
quotaManager: quotaManager,
}
currentContainerVersion, err := semver.Make(CurrentContainerVersion)
if err != nil {
logger.Fatal("failed-to-parse-container-version", err)
}
pool := resource_pool.New(
logger,
*binPath,
*depotPath,
config,
cakeOrdinator,
rootfsCleaner,
mappingList,
parsedExternalIP,
*mtu,
subnetPool,
bridgemgr.New("w"+config.Tag+"b-", &devices.Bridge{}, &devices.Link{}),
ipTablesMgr,
injector,
iptables.NewGlobalChain(config.IPTables.Filter.DefaultChain, runner, logger.Session("global-chain")),
portPool,
strings.Split(*denyNetworks, ","),
strings.Split(*allowNetworks, ","),
runner,
quotaManager,
currentContainerVersion,
system.MkdirChowner{},
)
systemInfo := sysinfo.NewProvider(*depotPath)
backend := linux_backend.New(logger, pool, repo, injector, systemInfo, layercake.GraphPath(*graphRoot), *snapshotsPath, int(*maxContainers))
err = backend.Setup()
if err != nil {
logger.Fatal("failed-to-set-up-backend", err)
}
graceTime := *containerGraceTime
gardenServer := server.New(*listenNetwork, *listenAddr, graceTime, backend, logger)
err = gardenServer.Start()
if err != nil {
logger.Fatal("failed-to-start-server", err)
}
clock := clock.NewClock()
metronNotifier := metrics.NewPeriodicMetronNotifier(logger, metricsProvider, *metricsEmissionInterval, clock)
metronNotifier.Start()
signals := make(chan os.Signal, 1)
go func() {
<-signals
portPoolState = portPool.RefreshState()
port_pool.SaveState(path.Join(*stateDirPath, "port_pool.json"), portPoolState)
gardenServer.Stop()
metronNotifier.Stop()
os.Exit(0)
}()
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
logger.Info("started", lager.Data{
"network": *listenNetwork,
"addr": *listenAddr,
})
select {}
}
Expect(err).NotTo(HaveOccurred())
Expect(syscall.Mount("tmpfs", root, "tmpfs", 0, "")).To(Succeed())
driver, err = graphdriver.GetDriver("aufs", root, nil)
Expect(err).NotTo(HaveOccurred())
driver = "aedaufs.QuotaedDriver{
GraphDriver: driver,
Unmount: quotaedaufs.Unmount,
BackingStoreMgr: "aedaufs.BackingStore{
RootPath: backingStoreRoot,
Logger: lagertest.NewTestLogger("test"),
},
LoopMounter: "aedaufs.Loop{
Retrier: retrier.New(retrier.ConstantBackoff(200, 500*time.Millisecond), nil),
Logger: lagertest.NewTestLogger("test"),
},
Retrier: retrier.New(retrier.ConstantBackoff(200, 500*time.Millisecond), nil),
RootPath: root,
Logger: lagertest.NewTestLogger("test"),
}
graph, err := graph.NewGraph(root, driver)
Expect(err).NotTo(HaveOccurred())
cake = &layercake.Docker{
Graph: graph,
Driver: driver,
}
})
Eventually(nc).Should(gbytes.Say("hallo"))
}
return err
}).ShouldNot(HaveOccurred())
})
Describe("domain name resolution", func() {
itCanResolve := func(domainName string) {
defer func() {
err := gardenClient.Destroy(container.Handle())
Expect(err).NotTo(HaveOccurred())
}()
output := gbytes.NewBuffer()
err := retrier.New(retrier.ConstantBackoff(30, 2*time.Second), nil).Run(func() error {
proc, err := container.Run(garden.ProcessSpec{
// We are using ping here rather than nslookup as we saw some
// flakey behaviour with nslookup on our local concourse machines.
// We're testing on the output of ping, which reports "bad address"
// if it is unable to resolve a domain.
Path: "ping",
Args: []string{"-c", "1", domainName},
User: "******",
}, garden.ProcessIO{Stdout: output, Stderr: output})
Expect(err).NotTo(HaveOccurred())
_, err = proc.Wait()
return err
})