create named volume

cli/commands.go

@@ -135,6 +135,15 @@ func CreateCluster(c *cli.Context) error {
 		log.Fatal(err)
 	}
 
+	// create a docker volume for sharing image tarballs with the cluster
+	imageVolume, err := createImageVolume(c.String("name"))
+	log.Println("Created docker volume ", imageVolume.Name)
+	if err != nil {
+		return err
+	}
+	volumes := c.StringSlice("volume")
+	volumes = append(volumes, fmt.Sprintf("%s:/images", imageVolume.Name))
+
 	clusterSpec := &ClusterSpec{
 		AgentArgs:         []string{},
 		APIPort:           *apiPort,
@@ -146,7 +155,7 @@ func CreateCluster(c *cli.Context) error {
 		PortAutoOffset:    c.Int("port-auto-offset"),
 		ServerArgs:        k3sServerArgs,
 		Verbose:           c.GlobalBool("verbose"),
-		Volumes:           c.StringSlice("volume"),
+		Volumes:           volumes,
 	}
 
 	// create the server
@@ -241,8 +250,8 @@ func DeleteCluster(c *cli.Context) error {
 				}
 			}
 		}
-		log.Println("...Removing server")
 		deleteClusterDir(cluster.name)
+		log.Println("...Removing server")
 		if err := removeContainer(cluster.server.ID); err != nil {
 			return fmt.Errorf("ERROR: Couldn't remove server for cluster %s\n%+v", cluster.name, err)
 		}
@@ -251,6 +260,11 @@ func DeleteCluster(c *cli.Context) error {
 			log.Printf("WARNING: couldn't delete cluster network for cluster %s\n%+v", cluster.name, err)
 		}
 
+		log.Println("...Removing docker image volume")
+		if err := deleteImageVolume(cluster.name); err != nil {
+			log.Printf("WARNING: couldn't delete image docker volume for cluster %s\n%+v", cluster.name, err)
+		}
+
 		log.Printf("SUCCESS: removed cluster [%s]", cluster.name)
 	}
 

cli/container.go

@@ -123,13 +123,6 @@ func createServer(spec *ClusterSpec) (string, error) {
 		hostConfig.Binds = spec.Volumes
 	}
 
-	// we need to mount the clusterDir subdirectory `clusterDir/images` to enable importing images without the need for `docker cp`
-	clusterDir, err := getClusterDir(spec.ClusterName)
-	if err != nil {
-		return "", fmt.Errorf("ERROR: couldn't get cluster dir for mounting\n%+v", err)
-	}
-	hostConfig.Binds = append(hostConfig.Binds, fmt.Sprintf("%s:/images", clusterDir+"/images"))
-
 	networkingConfig := &network.NetworkingConfig{
 		EndpointsConfig: map[string]*network.EndpointSettings{
 			k3dNetworkName(spec.ClusterName): {
@@ -199,13 +192,6 @@ func createWorker(spec *ClusterSpec, postfix int) (string, error) {
 		hostConfig.Binds = spec.Volumes
 	}
 
-	// we need to mount the clusterDir subdirectory `clusterDir/images` to enable importing images without the need for `docker cp`
-	clusterDir, err := getClusterDir(spec.ClusterName)
-	if err != nil {
-		return "", fmt.Errorf("ERROR: couldn't get cluster dir for mounting\n%+v", err)
-	}
-	hostConfig.Binds = append(hostConfig.Binds, fmt.Sprintf("%s:/images", clusterDir+"/images"))
-
 	networkingConfig := &network.NetworkingConfig{
 		EndpointsConfig: map[string]*network.EndpointSettings{
 			k3dNetworkName(spec.ClusterName): {

cli/image.go

@@ -25,11 +25,11 @@ func importImage(clusterName string, images []string) error {
 	}
 
 	// get cluster directory to temporarily save the image tarball there
-	imageBasePathLocal, err := getClusterDir(clusterName)
-	imageBasePathLocal = imageBasePathLocal + "/images/"
+	imageVolume, err := getImageVolume(clusterName)
 	if err != nil {
-		return fmt.Errorf("ERROR: couldn't get cluster directory for cluster [%s]\n%+v", clusterName, err)
+		return fmt.Errorf("ERROR: couldn't get image volume for cluster [%s]\n%+v", clusterName, err)
 	}
+	imageBasePathLocal := imageVolume.Mountpoint + "/"
 
 	//*** first, save the images using the local docker daemon
 	log.Printf("INFO: Saving images [%s] from local docker daemon...", images)

vendor/modules.txt

@@ -8,6 +8,7 @@ github.com/docker/docker/api/types
 github.com/docker/docker/api/types/container
 github.com/docker/docker/api/types/filters
 github.com/docker/docker/api/types/network
+github.com/docker/docker/api/types/volume
 github.com/docker/docker/client
 github.com/docker/docker/api/types/mount
 github.com/docker/docker/api/types/registry
@@ -18,7 +19,6 @@ github.com/docker/docker/api/types/versions
 github.com/docker/docker/api/types/events
 github.com/docker/docker/api/types/reference
 github.com/docker/docker/api/types/time
-github.com/docker/docker/api/types/volume
 github.com/docker/docker/pkg/tlsconfig
 # github.com/docker/go-connections v0.4.0
 github.com/docker/go-connections/nat