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fingerprint.go
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fingerprint.go
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package docker
import (
"context"
"runtime"
"sort"
"strings"
"time"
"github.com/hashicorp/nomad/helper"
"github.com/hashicorp/nomad/plugins/drivers"
pstructs "github.com/hashicorp/nomad/plugins/shared/structs"
)
func (d *Driver) Fingerprint(ctx context.Context) (<-chan *drivers.Fingerprint, error) {
ch := make(chan *drivers.Fingerprint)
go d.handleFingerprint(ctx, ch)
return ch, nil
}
func (d *Driver) previouslyDetected() bool {
d.detectedLock.RLock()
defer d.detectedLock.RUnlock()
return d.detected
}
func (d *Driver) setDetected(detected bool) {
d.detectedLock.Lock()
defer d.detectedLock.Unlock()
d.detected = detected
}
// setFingerprintSuccess marks the driver as having fingerprinted successfully
func (d *Driver) setFingerprintSuccess() {
d.fingerprintLock.Lock()
d.fingerprintSuccess = helper.BoolToPtr(true)
d.fingerprintLock.Unlock()
}
// setFingerprintFailure marks the driver as having failed fingerprinting
func (d *Driver) setFingerprintFailure() {
d.fingerprintLock.Lock()
d.fingerprintSuccess = helper.BoolToPtr(false)
d.fingerprintLock.Unlock()
}
// fingerprintSuccessful returns true if the driver has
// never fingerprinted or has successfully fingerprinted
func (d *Driver) fingerprintSuccessful() bool {
d.fingerprintLock.Lock()
defer d.fingerprintLock.Unlock()
return d.fingerprintSuccess == nil || *d.fingerprintSuccess
}
func (d *Driver) handleFingerprint(ctx context.Context, ch chan *drivers.Fingerprint) {
defer close(ch)
ticker := time.NewTimer(0)
for {
select {
case <-ctx.Done():
return
case <-d.ctx.Done():
return
case <-ticker.C:
ticker.Reset(fingerprintPeriod)
ch <- d.buildFingerprint()
}
}
}
func (d *Driver) buildFingerprint() *drivers.Fingerprint {
fp := &drivers.Fingerprint{
Attributes: map[string]*pstructs.Attribute{},
Health: drivers.HealthStateHealthy,
HealthDescription: drivers.DriverHealthy,
}
client, _, err := d.dockerClients()
if err != nil {
if d.fingerprintSuccessful() {
d.logger.Info("failed to initialize client", "error", err)
}
d.setFingerprintFailure()
return &drivers.Fingerprint{
Health: drivers.HealthStateUndetected,
HealthDescription: "Failed to initialize docker client",
}
}
env, err := client.Version()
if err != nil {
if d.fingerprintSuccessful() {
d.logger.Debug("could not connect to docker daemon", "endpoint", client.Endpoint(), "error", err)
}
d.setFingerprintFailure()
result := drivers.HealthStateUndetected
if d.previouslyDetected() {
result = drivers.HealthStateUnhealthy
}
return &drivers.Fingerprint{
Health: result,
HealthDescription: "Failed to connect to docker daemon",
}
}
d.setDetected(true)
fp.Attributes["driver.docker"] = pstructs.NewBoolAttribute(true)
fp.Attributes["driver.docker.version"] = pstructs.NewStringAttribute(env.Get("Version"))
if d.config.AllowPrivileged {
fp.Attributes["driver.docker.privileged.enabled"] = pstructs.NewBoolAttribute(true)
}
if d.config.Volumes.Enabled {
fp.Attributes["driver.docker.volumes.enabled"] = pstructs.NewBoolAttribute(true)
}
if nets, err := client.ListNetworks(); err != nil {
d.logger.Warn("error discovering bridge IP", "error", err)
} else {
for _, n := range nets {
if n.Name != "bridge" {
continue
}
if len(n.IPAM.Config) == 0 {
d.logger.Warn("no IPAM config for bridge network")
break
}
if n.IPAM.Config[0].Gateway != "" {
fp.Attributes["driver.docker.bridge_ip"] = pstructs.NewStringAttribute(n.IPAM.Config[0].Gateway)
} else {
// Docker 17.09.0-ce dropped the Gateway IP from the bridge network
// See https://github.com/moby/moby/issues/32648
if d.fingerprintSuccess == nil {
d.logger.Debug("bridge_ip could not be discovered")
}
}
break
}
}
if dockerInfo, err := client.Info(); err != nil {
d.logger.Warn("failed to get Docker system info", "error", err)
} else {
runtimeNames := make([]string, 0, len(dockerInfo.Runtimes))
for name := range dockerInfo.Runtimes {
if d.config.GPURuntimeName == name {
// Nvidia runtime is detected by Docker.
// It makes possible to run GPU workloads using Docker driver on this host.
d.gpuRuntime = true
}
runtimeNames = append(runtimeNames, name)
}
sort.Strings(runtimeNames)
fp.Attributes["driver.docker.runtimes"] = pstructs.NewStringAttribute(
strings.Join(runtimeNames, ","))
fp.Attributes["driver.docker.os_type"] = pstructs.NewStringAttribute(dockerInfo.OSType)
if runtime.GOOS == "windows" && dockerInfo.OSType == "linux" {
if d.fingerprintSuccessful() {
d.logger.Warn("detected Linux docker containers on Windows; only Windows containers are supported")
}
d.setFingerprintFailure()
return &drivers.Fingerprint{
Health: drivers.HealthStateUnhealthy,
HealthDescription: "Docker is configured with Linux containers; only Windows containers are supported",
}
}
}
d.setFingerprintSuccess()
return fp
}