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package run
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/*
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* The functions in this file take care of spinning up the
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* k3s server and worker containers as well as deleting them.
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*/
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import (
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"context"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"time"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/container"
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"github.com/docker/docker/api/types/network"
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"github.com/docker/docker/client"
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"github.com/docker/go-connections/nat"
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)
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func startContainer(verbose bool, config *container.Config, hostConfig *container.HostConfig, networkingConfig *network.NetworkingConfig, containerName string) (string, error) {
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ctx := context.Background()
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docker, err := client.NewEnvClient()
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if err != nil {
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return "", fmt.Errorf("ERROR: couldn't create docker client\n%+v", err)
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}
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resp, err := docker.ContainerCreate(ctx, config, hostConfig, networkingConfig, containerName)
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if client.IsErrImageNotFound(err) {
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log.Printf("Pulling image %s...\n", config.Image)
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reader, err := docker.ImagePull(ctx, config.Image, types.ImagePullOptions{})
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if err != nil {
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return "", fmt.Errorf("ERROR: couldn't pull image %s\n%+v", config.Image, err)
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}
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defer reader.Close()
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if verbose {
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_, err := io.Copy(os.Stdout, reader)
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if err != nil {
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log.Printf("WARNING: couldn't get docker output\n%+v", err)
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}
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} else {
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_, err := io.Copy(ioutil.Discard, reader)
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if err != nil {
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log.Printf("WARNING: couldn't get docker output\n%+v", err)
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}
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}
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resp, err = docker.ContainerCreate(ctx, config, hostConfig, networkingConfig, containerName)
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if err != nil {
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return "", fmt.Errorf("ERROR: couldn't create container after pull %s\n%+v", containerName, err)
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}
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} else if err != nil {
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return "", fmt.Errorf("ERROR: couldn't create container %s\n%+v", containerName, err)
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}
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if err := docker.ContainerStart(ctx, resp.ID, types.ContainerStartOptions{}); err != nil {
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return "", err
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}
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return resp.ID, nil
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}
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func createServer(verbose bool, image string, port string, args []string, env []string, name string, volumes []string) (string, error) {
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log.Printf("Creating server using %s...\n", image)
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containerLabels := make(map[string]string)
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containerLabels["app"] = "k3d"
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containerLabels["component"] = "server"
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containerLabels["created"] = time.Now().Format("2006-01-02 15:04:05")
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containerLabels["cluster"] = name
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containerName := fmt.Sprintf("k3d-%s-server", name)
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containerPort := nat.Port(fmt.Sprintf("%s/tcp", port))
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hostConfig := &container.HostConfig{
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PortBindings: nat.PortMap{
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containerPort: []nat.PortBinding{
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{
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HostIP: "0.0.0.0",
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HostPort: port,
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},
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},
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},
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Privileged: true,
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}
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if len(volumes) > 0 && volumes[0] != "" {
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hostConfig.Binds = volumes
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}
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networkingConfig := &network.NetworkingConfig{
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EndpointsConfig: map[string]*network.EndpointSettings{
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name: {
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Aliases: []string{containerName},
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},
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},
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}
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config := &container.Config{
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Hostname: containerName,
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Image: image,
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Cmd: append([]string{"server"}, args...),
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ExposedPorts: nat.PortSet{
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containerPort: struct{}{},
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},
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Env: env,
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Labels: containerLabels,
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}
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id, err := startContainer(verbose, config, hostConfig, networkingConfig, containerName)
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if err != nil {
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return "", fmt.Errorf("ERROR: couldn't create container %s\n%+v", containerName, err)
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}
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return id, nil
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}
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// createWorker creates/starts a k3s agent node that connects to the server
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func createWorker(verbose bool, image string, args []string, env []string, name string, volumes []string, postfix string, serverPort string) (string, error) {
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containerLabels := make(map[string]string)
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containerLabels["app"] = "k3d"
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containerLabels["component"] = "worker"
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containerLabels["created"] = time.Now().Format("2006-01-02 15:04:05")
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containerLabels["cluster"] = name
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containerName := fmt.Sprintf("k3d-%s-worker-%s", name, postfix)
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env = append(env, fmt.Sprintf("K3S_URL=https://k3d-%s-server:%s", name, serverPort))
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hostConfig := &container.HostConfig{
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Tmpfs: map[string]string{
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"/run": "",
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"/var/run": "",
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},
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Privileged: true,
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}
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if len(volumes) > 0 && volumes[0] != "" {
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hostConfig.Binds = volumes
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}
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networkingConfig := &network.NetworkingConfig{
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EndpointsConfig: map[string]*network.EndpointSettings{
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name: {
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Aliases: []string{containerName},
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},
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},
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}
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config := &container.Config{
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Hostname: containerName,
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Image: image,
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Env: env,
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Labels: containerLabels,
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}
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id, err := startContainer(verbose, config, hostConfig, networkingConfig, containerName)
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if err != nil {
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return "", fmt.Errorf("ERROR: couldn't start container %s\n%+v", containerName, err)
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}
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return id, nil
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}
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// removeContainer tries to rm a container, selected by Docker ID, and does a rm -f if it fails (e.g. if container is still running)
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func removeContainer(ID string) error {
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ctx := context.Background()
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docker, err := client.NewEnvClient()
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if err != nil {
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return fmt.Errorf("ERROR: couldn't create docker client\n%+v", err)
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}
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if err := docker.ContainerRemove(ctx, ID, types.ContainerRemoveOptions{Force: true}); err != nil {
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return fmt.Errorf("FAILURE: couldn't delete container [%s] -> %+v", ID, err)
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}
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return nil
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}
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