Add default cluster config file and return service container pointer

Add more generic functions to go services

Add x509 authentication

docker/docker.go

@@ -0,0 +1,71 @@
+package docker
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/container"
+	"github.com/rancher/rke/hosts"
+)
+
+func DoRunContainer(imageCfg *container.Config, hostCfg *container.HostConfig, containerName string, host *hosts.Host, plane string) error {
+	isRunning, err := IsContainerRunning(host, containerName)
+	if err != nil {
+		return err
+	}
+	if isRunning {
+		logrus.Infof("[%s] Container %s is already running on host [%s]", plane, containerName, host.Hostname)
+		return nil
+	}
+	logrus.Debugf("[%s] Pulling Image on host [%s]", plane, host.Hostname)
+	err = PullImage(host, imageCfg.Image)
+	if err != nil {
+		return err
+	}
+	logrus.Infof("[%s] Successfully pulled %s image on host [%s]", plane, containerName, host.Hostname)
+	resp, err := host.DClient.ContainerCreate(context.Background(), imageCfg, hostCfg, nil, containerName)
+	if err != nil {
+		return fmt.Errorf("Failed to create %s container on host [%s]: %v", containerName, host.Hostname, err)
+	}
+	if err := host.DClient.ContainerStart(context.Background(), resp.ID, types.ContainerStartOptions{}); err != nil {
+		return fmt.Errorf("Failed to start %s container on host [%s]: %v", containerName, host.Hostname, err)
+	}
+	logrus.Debugf("[%s] Successfully started %s container: %s", plane, containerName, resp.ID)
+	logrus.Infof("[%s] Successfully started %s container on host [%s]", plane, containerName, host.Hostname)
+	return nil
+}
+
+func IsContainerRunning(host *hosts.Host, containerName string) (bool, error) {
+	logrus.Debugf("Checking if container %s is running on host [%s]", containerName, host.Hostname)
+	containers, err := host.DClient.ContainerList(context.Background(), types.ContainerListOptions{})
+	if err != nil {
+		return false, fmt.Errorf("Can't get Docker containers for host [%s]: %v", host.Hostname, err)
+
+	}
+	for _, container := range containers {
+		if container.Names[0] == "/"+containerName {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func PullImage(host *hosts.Host, containerImage string) error {
+	out, err := host.DClient.ImagePull(context.Background(), containerImage, types.ImagePullOptions{})
+	if err != nil {
+		return fmt.Errorf("Can't pull Docker image %s for host [%s]: %v", containerImage, host.Hostname, err)
+	}
+	defer out.Close()
+	if logrus.GetLevel() == logrus.DebugLevel {
+		io.Copy(os.Stdout, out)
+	} else {
+		io.Copy(ioutil.Discard, out)
+	}
+
+	return nil
+}