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431 lines
12 KiB
431 lines
12 KiB
package run
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/*
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* This file contains the "backend" functionality for the CLI commands (and flags)
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*/
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"strconv"
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"strings"
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"time"
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"github.com/docker/docker/api/types/filters"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/client"
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"github.com/urfave/cli"
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)
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const (
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defaultRegistry = "docker.io"
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defaultServerCount = 1
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)
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// CheckTools checks if the docker API server is responding
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func CheckTools(c *cli.Context) error {
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log.Print("Checking docker...")
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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 err
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}
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ping, err := docker.Ping(ctx)
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if err != nil {
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return fmt.Errorf("ERROR: checking docker failed\n%+v", err)
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}
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log.Printf("SUCCESS: Checking docker succeeded (API: v%s)\n", ping.APIVersion)
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return nil
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}
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// CreateCluster creates a new single-node cluster container and initializes the cluster directory
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func CreateCluster(c *cli.Context) error {
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if err := CheckClusterName(c.String("name")); err != nil {
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return err
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}
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// define image
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image := c.String("image")
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if c.IsSet("version") {
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// TODO: --version to be deprecated
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log.Println("[WARNING] The `--version` flag will be deprecated soon, please use `--image rancher/k3s:<version>` instead")
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if c.IsSet("image") {
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// version specified, custom image = error (to push deprecation of version flag)
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log.Fatalln("[ERROR] Please use `--image <image>:<version>` instead of --image and --version")
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} else {
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// version specified, default image = ok (until deprecation of version flag)
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image = fmt.Sprintf("%s:%s", strings.Split(image, ":")[0], c.String("version"))
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}
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}
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if len(strings.Split(image, "/")) <= 2 {
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// fallback to default registry
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image = fmt.Sprintf("%s/%s", defaultRegistry, image)
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}
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// create cluster network
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networkID, err := createClusterNetwork(c.String("name"))
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if err != nil {
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return err
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}
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log.Printf("Created cluster network with ID %s", networkID)
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if c.IsSet("timeout") && !c.IsSet("wait") {
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return errors.New("Cannot use --timeout flag without --wait flag")
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}
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// environment variables
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env := []string{"K3S_KUBECONFIG_OUTPUT=/output/kubeconfig.yaml"}
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if c.IsSet("env") || c.IsSet("e") {
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env = append(env, c.StringSlice("env")...)
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}
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k3sClusterSecret := ""
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if c.Int("workers") > 0 {
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k3sClusterSecret = fmt.Sprintf("K3S_CLUSTER_SECRET=%s", GenerateRandomString(20))
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env = append(env, k3sClusterSecret)
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}
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// k3s server arguments
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// TODO: --port will soon be --api-port since we want to re-use --port for arbitrary port mappings
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if c.IsSet("port") {
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log.Println("INFO: As of v2.0.0 --port will be used for arbitrary port mapping. Please use --api-port/-a instead for configuring the Api Port")
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}
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k3sServerArgs := []string{"--https-listen-port", c.String("api-port")}
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if c.IsSet("server-arg") || c.IsSet("x") {
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k3sServerArgs = append(k3sServerArgs, c.StringSlice("server-arg")...)
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}
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// new port map
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portmap, err := mapNodesToPortSpecs(c.StringSlice("publish"), GetAllContainerNames(c.String("name"), defaultServerCount, c.Int("workers")))
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if err != nil {
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log.Fatal(err)
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}
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// create the server
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log.Printf("Creating cluster [%s]", c.String("name"))
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dockerID, err := createServer(
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c.GlobalBool("verbose"),
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image,
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c.String("api-port"),
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k3sServerArgs,
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env,
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c.String("name"),
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strings.Split(c.String("volume"), ","),
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portmap,
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)
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if err != nil {
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log.Printf("ERROR: failed to create cluster\n%+v", err)
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delErr := DeleteCluster(c)
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if delErr != nil {
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return delErr
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}
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os.Exit(1)
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}
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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 err
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}
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// Wait for k3s to be up and running if wanted.
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// We're simply scanning the container logs for a line that tells us that everything's up and running
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// TODO: also wait for worker nodes
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start := time.Now()
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timeout := time.Duration(c.Int("timeout")) * time.Second
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for c.IsSet("wait") {
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// not running after timeout exceeded? Rollback and delete everything.
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if timeout != 0 && !time.Now().After(start.Add(timeout)) {
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err := DeleteCluster(c)
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if err != nil {
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return err
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}
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return errors.New("Cluster creation exceeded specified timeout")
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}
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// scan container logs for a line that tells us that the required services are up and running
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out, err := docker.ContainerLogs(ctx, dockerID, types.ContainerLogsOptions{ShowStdout: true, ShowStderr: true})
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if err != nil {
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out.Close()
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return fmt.Errorf("ERROR: couldn't get docker logs for %s\n%+v", c.String("name"), err)
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}
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buf := new(bytes.Buffer)
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nRead, _ := buf.ReadFrom(out)
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out.Close()
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output := buf.String()
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if nRead > 0 && strings.Contains(string(output), "Running kubelet") {
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break
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}
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time.Sleep(1 * time.Second)
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}
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// create the directory where we will put the kubeconfig file by default (when running `k3d get-config`)
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// TODO: this can probably be moved to `k3d get-config` or be removed in a different approach
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createClusterDir(c.String("name"))
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// spin up the worker nodes
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// TODO: do this concurrently in different goroutines
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if c.Int("workers") > 0 {
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k3sWorkerArgs := []string{}
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env := []string{k3sClusterSecret}
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log.Printf("Booting %s workers for cluster %s", strconv.Itoa(c.Int("workers")), c.String("name"))
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for i := 0; i < c.Int("workers"); i++ {
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workerID, err := createWorker(
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c.GlobalBool("verbose"),
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image,
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k3sWorkerArgs,
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env,
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c.String("name"),
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strings.Split(c.String("volume"), ","),
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i,
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c.String("api-port"),
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portmap,
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c.Int("port-auto-offset"),
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)
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if err != nil {
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return fmt.Errorf("ERROR: failed to create worker node for cluster %s\n%+v", c.String("name"), err)
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}
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log.Printf("Created worker with ID %s\n", workerID)
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}
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}
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log.Printf("SUCCESS: created cluster [%s]", c.String("name"))
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log.Printf(`You can now use the cluster with:
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export KUBECONFIG="$(%s get-kubeconfig --name='%s')"
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kubectl cluster-info`, os.Args[0], c.String("name"))
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return nil
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}
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// DeleteCluster removes the containers belonging to a cluster and its local directory
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func DeleteCluster(c *cli.Context) error {
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// operate on one or all clusters
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clusters := make(map[string]cluster)
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if !c.Bool("all") {
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cluster, err := getCluster(c.String("name"))
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if err != nil {
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return err
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}
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clusters[c.String("name")] = cluster
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} else {
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clusterMap, err := getClusters()
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if err != nil {
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return fmt.Errorf("ERROR: `--all` specified, but no clusters were found\n%+v", err)
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}
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// copy clusterMap
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for k, v := range clusterMap {
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clusters[k] = v
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}
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}
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// remove clusters one by one instead of appending all names to the docker command
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// this allows for more granular error handling and logging
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for _, cluster := range clusters {
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log.Printf("Removing cluster [%s]", cluster.name)
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if len(cluster.workers) > 0 {
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// TODO: this could be done in goroutines
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log.Printf("...Removing %d workers\n", len(cluster.workers))
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for _, worker := range cluster.workers {
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if err := removeContainer(worker.ID); err != nil {
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log.Println(err)
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continue
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}
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}
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}
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log.Println("...Removing server")
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deleteClusterDir(cluster.name)
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if err := removeContainer(cluster.server.ID); err != nil {
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return fmt.Errorf("ERROR: Couldn't remove server for cluster %s\n%+v", cluster.name, err)
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}
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if err := deleteClusterNetwork(cluster.name); err != nil {
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log.Printf("WARNING: couldn't delete cluster network for cluster %s\n%+v", cluster.name, err)
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}
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log.Printf("SUCCESS: removed cluster [%s]", cluster.name)
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}
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return nil
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}
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// StopCluster stops a running cluster container (restartable)
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func StopCluster(c *cli.Context) error {
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// operate on one or all clusters
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clusters := make(map[string]cluster)
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if !c.Bool("all") {
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cluster, err := getCluster(c.String("name"))
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if err != nil {
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return err
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}
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clusters[c.String("name")] = cluster
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} else {
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clusterMap, err := getClusters()
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if err != nil {
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return fmt.Errorf("ERROR: `--all` specified, but no clusters were found\n%+v", err)
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}
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// copy clusterMap
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for k, v := range clusterMap {
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clusters[k] = v
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}
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}
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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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// remove clusters one by one instead of appending all names to the docker command
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// this allows for more granular error handling and logging
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for _, cluster := range clusters {
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log.Printf("Stopping cluster [%s]", cluster.name)
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if len(cluster.workers) > 0 {
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log.Printf("...Stopping %d workers\n", len(cluster.workers))
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for _, worker := range cluster.workers {
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if err := docker.ContainerStop(ctx, worker.ID, nil); err != nil {
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log.Println(err)
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continue
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}
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}
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}
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log.Println("...Stopping server")
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if err := docker.ContainerStop(ctx, cluster.server.ID, nil); err != nil {
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return fmt.Errorf("ERROR: Couldn't stop server for cluster %s\n%+v", cluster.name, err)
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}
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log.Printf("SUCCESS: Stopped cluster [%s]", cluster.name)
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}
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return nil
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}
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// StartCluster starts a stopped cluster container
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func StartCluster(c *cli.Context) error {
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// operate on one or all clusters
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clusters := make(map[string]cluster)
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if !c.Bool("all") {
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cluster, err := getCluster(c.String("name"))
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if err != nil {
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return err
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}
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clusters[c.String("name")] = cluster
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} else {
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clusterMap, err := getClusters()
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if err != nil {
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return fmt.Errorf("ERROR: `--all` specified, but no clusters were found\n%+v", err)
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}
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// copy clusterMap
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for k, v := range clusterMap {
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clusters[k] = v
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}
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}
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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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// remove clusters one by one instead of appending all names to the docker command
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// this allows for more granular error handling and logging
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for _, cluster := range clusters {
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log.Printf("Starting cluster [%s]", cluster.name)
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log.Println("...Starting server")
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if err := docker.ContainerStart(ctx, cluster.server.ID, types.ContainerStartOptions{}); err != nil {
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return fmt.Errorf("ERROR: Couldn't start server for cluster %s\n%+v", cluster.name, err)
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}
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if len(cluster.workers) > 0 {
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log.Printf("...Starting %d workers\n", len(cluster.workers))
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for _, worker := range cluster.workers {
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if err := docker.ContainerStart(ctx, worker.ID, types.ContainerStartOptions{}); err != nil {
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log.Println(err)
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continue
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}
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}
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}
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log.Printf("SUCCESS: Started cluster [%s]", cluster.name)
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}
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return nil
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}
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// ListClusters prints a list of created clusters
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func ListClusters(c *cli.Context) error {
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printClusters(c.Bool("all"))
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return nil
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}
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// GetKubeConfig grabs the kubeconfig from the running cluster and prints the path to stdout
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func GetKubeConfig(c *cli.Context) 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 err
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}
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filters := filters.NewArgs()
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filters.Add("label", "app=k3d")
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filters.Add("label", fmt.Sprintf("cluster=%s", c.String("name")))
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filters.Add("label", "component=server")
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server, err := docker.ContainerList(ctx, types.ContainerListOptions{
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Filters: filters,
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})
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if err != nil {
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return fmt.Errorf("Failed to get server container for cluster %s\n%+v", c.String("name"), err)
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}
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if len(server) == 0 {
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return fmt.Errorf("No server container for cluster %s", c.String("name"))
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}
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// get kubeconfig file from container and read contents
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reader, _, err := docker.CopyFromContainer(ctx, server[0].ID, "/output/kubeconfig.yaml")
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if err != nil {
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return fmt.Errorf("ERROR: couldn't copy kubeconfig.yaml from server container %s\n%+v", server[0].ID, err)
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}
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defer reader.Close()
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readBytes, err := ioutil.ReadAll(reader)
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if err != nil {
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return fmt.Errorf("ERROR: couldn't read kubeconfig from container\n%+v", err)
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}
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// create destination kubeconfig file
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clusterDir, err := getClusterDir(c.String("name"))
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destPath := fmt.Sprintf("%s/kubeconfig.yaml", clusterDir)
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if err != nil {
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return err
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}
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kubeconfigfile, err := os.Create(destPath)
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if err != nil {
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return fmt.Errorf("ERROR: couldn't create kubeconfig.yaml in %s\n%+v", clusterDir, err)
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}
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defer kubeconfigfile.Close()
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// write to file, skipping the first 512 bytes which contain file metadata and trimming any NULL characters
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_, err = kubeconfigfile.Write(bytes.Trim(readBytes[512:], "\x00"))
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if err != nil {
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return fmt.Errorf("ERROR: couldn't write to kubeconfig.yaml\n%+v", err)
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}
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// output kubeconfig file path to stdout
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fmt.Println(destPath)
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return nil
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}
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