func main() {
fmt.Println("dockerapi started...")
time.Sleep(time.Millisecond * 5000)
fmt.Println("action: " + ACTION)
fmt.Println("containers: " + CONTAINERS)
var containers = strings.Split(CONTAINERS, ",")
var docker *dockerapi.Client
var err error
docker, err = dockerapi.NewClient(DOCKER_HOST)
if err != nil {
fmt.Println(err.Error())
}
err = docker.Ping()
for i := range containers {
fmt.Println(ACTION + " issued for " + containers[i])
switch ACTION {
case "stop":
err = docker.StopContainer(containers[i], 5)
case "start":
err = docker.StartContainer(containers[i], nil)
default:
fmt.Println(ACTION + " unsupported action")
}
if err != nil {
fmt.Println(err.Error())
}
time.Sleep(time.Millisecond * 2000)
}
}
func main() {
logger = log.New(os.Stdout, "logger: ", log.Lshortfile|log.Ldate|log.Ltime)
var VERSION = os.Getenv("CCP_VERSION")
logger.Println("dnsbridgeserver " + VERSION + ": starting")
getEnvVars()
var dockerConnected = false
var tries = 0
var docker *dockerapi.Client
var err error
for tries = 0; tries < MAX_TRIES; tries++ {
docker, err = dockerapi.NewClient(DOCKER_URL)
err = docker.Ping()
if err != nil {
logger.Println("could not ping docker host")
logger.Println("sleeping and will retry in %d sec\n", delaySeconds)
time.Sleep(delay)
} else {
logger.Println("no err in connecting to docker")
dockerConnected = true
break
}
}
if dockerConnected == false {
logger.Println("failing, could not connect to docker after retries")
panic("cant connect to docker")
}
events := make(chan *dockerapi.APIEvents)
assert(docker.AddEventListener(events))
logger.Println("dnsbridgeserver: Listening for Docker events...")
for msg := range events {
switch msg.Status {
//case "start", "create":
case "start":
logger.Println("event: " + msg.Status + " ID=" + msg.ID + " From:" + msg.From)
dnsbridgeapi.Action(logger, msg.Status, msg.ID, docker, TTL, CONSUL_URL, DOMAIN)
case "stop":
logger.Println("event: " + msg.Status + " ID=" + msg.ID + " From:" + msg.From)
dnsbridgeapi.Action(logger, msg.Status, msg.ID, docker, TTL, CONSUL_URL, DOMAIN)
case "destroy":
logger.Println("event: " + msg.Status + " ID=" + msg.ID + " From:" + msg.From)
dnsbridgeapi.Action(logger, msg.Status, msg.ID, docker, TTL, CONSUL_URL, DOMAIN)
case "die":
logger.Println("event: " + msg.Status + " ID=" + msg.ID + " From:" + msg.From)
default:
logger.Println("event: " + msg.Status)
}
}
}
func (p *DockerInDockerPool) clientInit(client *dockerapi.Client) error {
if len(p.preloadImages) == 0 {
return client.Ping()
}
for _, imageData := range p.preloadImages {
err := client.LoadImage(dockerapi.LoadImageOptions{
InputStream: bytes.NewReader(imageData),
})
if err != nil {
return err
}
}
return nil
}
// Docker generates a docker client
func Docker() (client *Client, err error) {
var c *api.Client
if misc.ZeroOrNil(current.CertPath) {
c, err = api.NewClient(current.Endpoint)
} else {
cert := fmt.Sprintf("%s/cert.pem", current.CertPath) // X.509 Certificate
key := fmt.Sprintf("%s/key.pem", current.CertPath) // Private Key
ca := fmt.Sprintf("%s/ca.pem", current.CertPath) // Certificate authority
c, err = api.NewTLSClient(current.Endpoint, cert, key, ca)
}
if !misc.ZeroOrNil(c) {
err = c.Ping()
}
if misc.ZeroOrNil(err) {
c.SkipServerVersionCheck = true
return &Client{c, current}, nil
}
return nil, err
}
// dockerEventListener читает из канала события от докера и реагирует на них
func dockerEventListener(server *SSHServer, client *docker.Client, events chan *docker.APIEvents) {
for {
select {
case event, ok := <-events:
if !ok {
log.Printf("Docker daemon connection interrupted")
break
}
// Если был запущен контейнер, проверяем что у него есть 22 порт и добавляем
if event.Status == "start" {
log.Printf("Container %s was started", event.ID[:12])
container, _ := client.InspectContainer(event.ID)
if len(container.NetworkSettings.Ports) == 0 {
continue
}
for port, mapping := range container.NetworkSettings.Ports {
if port == "22/tcp" {
log.Printf("Added %v: %s:%v\n", container.ID[:12], mapping[0].HostIP, mapping[0].HostPort)
server.AddHost(container.ID, fmt.Sprintf("%s:%v", mapping[0].HostIP, mapping[0].HostPort))
}
}
}
// Если контейнер был удалён/убит, убераем его
if event.Status == "stop" || event.Status == "die" {
log.Printf("Container %s was removed", event.ID[:12])
server.RemoveContainer(event.ID)
}
case <-time.After(10 * time.Second):
if err := client.Ping(); err != nil {
log.Printf("Unable to ping docker daemon: %s", err)
}
}
}
}
// NewClient returns a new docker client or an error
func NewClient(dcfg Config) (Client, error) {
var client *docker.Client
var err error
if dcfg.Endpoint != "" {
client, err = docker.NewClient(dcfg.Endpoint)
} else if dcfg.UseBoot2Docker {
endpoint := os.Getenv("DOCKER_HOST")
if endpoint != "" {
path := os.Getenv("DOCKER_CERT_PATH")
cert := fmt.Sprintf("%s/cert.pem", path)
key := fmt.Sprintf("%s/key.pem", path)
ca := fmt.Sprintf("%s/ca.pem", path)
client, err = docker.NewTLSClient(endpoint, cert, key, ca)
}
} else {
return Client{}, errors.New("empty docker configuration")
}
if err != nil || client == nil {
return Client{dcfg, client}, err
}
return Client{dcfg, client}, client.Ping()
}
func generateFromEvents(client *docker.Client, configs ConfigFile) {
configs = configs.filterWatches()
if len(configs.Config) == 0 {
return
}
wg.Add(1)
defer wg.Done()
for {
if client == nil {
var err error
endpoint, err := getEndpoint()
if err != nil {
log.Printf("Bad endpoint: %s", err)
time.Sleep(10 * time.Second)
continue
}
client, err = NewDockerClient(endpoint)
if err != nil {
log.Printf("Unable to connect to docker daemon: %s", err)
time.Sleep(10 * time.Second)
continue
}
generateFromContainers(client)
}
eventChan := make(chan *docker.APIEvents, 100)
defer close(eventChan)
watching := false
for {
if client == nil {
break
}
err := client.Ping()
if err != nil {
log.Printf("Unable to ping docker daemon: %s", err)
if watching {
client.RemoveEventListener(eventChan)
watching = false
client = nil
}
time.Sleep(10 * time.Second)
break
}
if !watching {
err = client.AddEventListener(eventChan)
if err != nil && err != docker.ErrListenerAlreadyExists {
log.Printf("Error registering docker event listener: %s", err)
time.Sleep(10 * time.Second)
continue
}
watching = true
log.Println("Watching docker events")
}
select {
case event := <-eventChan:
if event == nil {
if watching {
client.RemoveEventListener(eventChan)
watching = false
client = nil
}
break
}
if event.Status == "start" || event.Status == "stop" || event.Status == "die" {
log.Printf("Received event %s for container %s", event.Status, event.ID[:12])
generateFromContainers(client)
}
case <-time.After(10 * time.Second):
// check for docker liveness
}
}
}
}