mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-12-26 07:59:37 -05:00
275 lines
9.0 KiB
Go
275 lines
9.0 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package cmd
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import (
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"bufio"
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"context"
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"errors"
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"fmt"
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"io"
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"net"
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"os"
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"runtime"
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"strings"
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"github.com/edgelesssys/constellation/v2/cli/internal/cloudcmd"
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"github.com/edgelesssys/constellation/v2/cli/internal/libvirt"
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"github.com/edgelesssys/constellation/v2/internal/cloud/cloudprovider"
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"github.com/edgelesssys/constellation/v2/internal/config"
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"github.com/edgelesssys/constellation/v2/internal/constants"
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"github.com/edgelesssys/constellation/v2/internal/file"
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"github.com/edgelesssys/constellation/v2/internal/grpc/dialer"
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"github.com/edgelesssys/constellation/v2/internal/license"
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"github.com/spf13/afero"
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"github.com/spf13/cobra"
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"golang.org/x/sys/unix"
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)
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func newMiniUpCmd() *cobra.Command {
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cmd := &cobra.Command{
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Use: "up",
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Short: "Create and initialize a new MiniConstellation cluster",
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Long: "Create and initialize a new MiniConstellation cluster.\n\n" +
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"A mini cluster consists of a single control-plane and worker node, hosted using QEMU/KVM.",
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Args: cobra.ExactArgs(0),
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RunE: runUp,
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}
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// override global flag so we don't have a default value for the config
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cmd.Flags().String("config", "", "path to the configuration file to use for the cluster")
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cmd.Flags().Bool("merge-kubeconfig", true, "merge Constellation kubeconfig file with default kubeconfig file in $HOME/.kube/config")
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return cmd
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}
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type miniUpCmd struct {
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log debugLog
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}
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func runUp(cmd *cobra.Command, _ []string) error {
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log, err := newCLILogger(cmd)
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if err != nil {
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return fmt.Errorf("creating logger: %w", err)
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}
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defer log.Sync()
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spinner, err := newSpinnerOrStderr(cmd)
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if err != nil {
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return err
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}
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defer spinner.Stop()
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creator := cloudcmd.NewCreator(spinner)
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m := &miniUpCmd{log: log}
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return m.up(cmd, creator, spinner)
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}
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func (m *miniUpCmd) up(cmd *cobra.Command, creator cloudCreator, spinner spinnerInterf) error {
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if err := m.checkSystemRequirements(cmd.ErrOrStderr()); err != nil {
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return fmt.Errorf("system requirements not met: %w", err)
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}
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fileHandler := file.NewHandler(afero.NewOsFs())
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// create config if not passed as flag and set default values
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config, err := m.prepareConfig(cmd, fileHandler)
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if err != nil {
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return fmt.Errorf("preparing config: %w", err)
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}
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m.log.Debugf("Prepared configuration")
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// create cluster
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spinner.Start("Creating cluster in QEMU ", false)
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err = m.createMiniCluster(cmd.Context(), fileHandler, creator, config)
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spinner.Stop()
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if err != nil {
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return fmt.Errorf("creating cluster: %w", err)
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}
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cmd.Println("Cluster successfully created.")
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connectURI := config.Provider.QEMU.LibvirtURI
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m.log.Debugf("Using connect URI %s", connectURI)
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if connectURI == "" {
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connectURI = libvirt.LibvirtTCPConnectURI
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}
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cmd.Println("Connect to the VMs by executing:")
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cmd.Printf("\tvirsh -c %s\n\n", connectURI)
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// initialize cluster
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if err := m.initializeMiniCluster(cmd, fileHandler, spinner); err != nil {
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return fmt.Errorf("initializing cluster: %w", err)
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}
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m.log.Debugf("Initialized cluster")
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return nil
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}
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// checkSystemRequirements checks if the system meets the requirements for running a MiniConstellation cluster.
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// We do so by verifying that the host:
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// - arch/os is linux/amd64.
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// - has access to /dev/kvm.
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// - has at least 4 CPU cores.
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// - has at least 4GB of memory.
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// - has at least 20GB of free disk space.
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func (m *miniUpCmd) checkSystemRequirements(out io.Writer) error {
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// check arch/os
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if runtime.GOARCH != "amd64" || runtime.GOOS != "linux" {
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return fmt.Errorf("creation of a QEMU based Constellation is not supported for %s/%s, a linux/amd64 platform is required", runtime.GOOS, runtime.GOARCH)
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}
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m.log.Debugf("Checked arch and os")
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// check if /dev/kvm exists
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if _, err := os.Stat("/dev/kvm"); err != nil {
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return fmt.Errorf("unable to access KVM device: %w", err)
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}
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m.log.Debugf("Checked that /dev/kvm exists")
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// check CPU cores
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if runtime.NumCPU() < 4 {
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return fmt.Errorf("insufficient CPU cores: %d, at least 4 cores are required by MiniConstellation", runtime.NumCPU())
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}
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if runtime.NumCPU() < 6 {
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fmt.Fprintf(out, "WARNING: Only %d CPU cores available. This may cause performance issues.\n", runtime.NumCPU())
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}
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m.log.Debugf("Checked CPU cores - there are %d", runtime.NumCPU())
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// check memory
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f, err := os.Open("/proc/meminfo")
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if err != nil {
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return fmt.Errorf("determining available memory: failed to open /proc/meminfo: %w", err)
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}
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defer f.Close()
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var memKB int
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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if strings.HasPrefix(scanner.Text(), "MemTotal:") {
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_, err = fmt.Sscanf(scanner.Text(), "MemTotal:%d", &memKB)
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if err != nil {
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return fmt.Errorf("determining available memory: failed to parse /proc/meminfo: %w", err)
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}
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}
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}
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m.log.Debugf("Scanned for available memory")
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memGB := memKB / 1024 / 1024
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if memGB < 4 {
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return fmt.Errorf("insufficient memory: %dGB, at least 4GB of memory are required by MiniConstellation", memGB)
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}
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if memGB < 6 {
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fmt.Fprintln(out, "WARNING: Less than 6GB of memory available. This may cause performance issues.")
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}
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m.log.Debugf("Checked available memory, you have %dGB available", memGB)
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var stat unix.Statfs_t
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if err := unix.Statfs(".", &stat); err != nil {
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return err
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}
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freeSpaceGB := stat.Bavail * uint64(stat.Bsize) / 1024 / 1024 / 1024
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if freeSpaceGB < 20 {
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return fmt.Errorf("insufficient disk space: %dGB, at least 20GB of disk space are required by MiniConstellation", freeSpaceGB)
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}
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m.log.Debugf("Checked for free space available, you have %dGB available", freeSpaceGB)
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return nil
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}
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// prepareConfig reads a given config, or creates a new minimal QEMU config.
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func (m *miniUpCmd) prepareConfig(cmd *cobra.Command, fileHandler file.Handler) (*config.Config, error) {
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m.log.Debugf("Preparing configuration")
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configPath, err := cmd.Flags().GetString("config")
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if err != nil {
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return nil, err
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}
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force, err := cmd.Flags().GetBool("force")
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if err != nil {
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return nil, fmt.Errorf("parsing force argument: %w", err)
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}
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// check for existing config
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if configPath != "" {
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conf, err := config.New(fileHandler, configPath, force)
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var configValidationErr *config.ValidationError
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if errors.As(err, &configValidationErr) {
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cmd.PrintErrln(configValidationErr.LongMessage())
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}
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if err != nil {
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return nil, err
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}
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if conf.GetProvider() != cloudprovider.QEMU {
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return nil, errors.New("invalid provider for MiniConstellation cluster")
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}
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return conf, nil
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}
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m.log.Debugf("Configuration path is %q", configPath)
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if err := cmd.Flags().Set("config", constants.ConfigFilename); err != nil {
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return nil, err
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}
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_, err = fileHandler.Stat(constants.ConfigFilename)
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if err == nil {
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// config already exists, prompt user to overwrite
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cmd.PrintErrln("A config file already exists in the current workspace. Use --config to use an existing config file.")
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ok, err := askToConfirm(cmd, "Do you want to overwrite it?")
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if err != nil {
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return nil, err
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}
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if !ok {
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return nil, errors.New("not overwriting existing config")
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}
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}
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config := config.Default()
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config.Name = constants.MiniConstellationUID
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config.RemoveProviderExcept(cloudprovider.QEMU)
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config.StateDiskSizeGB = 8
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m.log.Debugf("Prepared configuration")
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return config, fileHandler.WriteYAML(constants.ConfigFilename, config, file.OptOverwrite)
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}
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// createMiniCluster creates a new cluster using the given config.
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func (m *miniUpCmd) createMiniCluster(ctx context.Context, fileHandler file.Handler, creator cloudCreator, config *config.Config) error {
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m.log.Debugf("Creating mini cluster")
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idFile, err := creator.Create(ctx, cloudprovider.QEMU, config, "", 1, 1)
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if err != nil {
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return err
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}
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idFile.UID = constants.MiniConstellationUID // use UID "mini" to identify MiniConstellation clusters.
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m.log.Debugf("Cluster id file contains %v", idFile)
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return fileHandler.WriteJSON(constants.ClusterIDsFileName, idFile, file.OptNone)
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}
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// initializeMiniCluster initializes a QEMU cluster.
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func (m *miniUpCmd) initializeMiniCluster(cmd *cobra.Command, fileHandler file.Handler, spinner spinnerInterf) (retErr error) {
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m.log.Debugf("Initializing mini cluster")
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// clean up cluster resources if initialization fails
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defer func() {
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if retErr != nil {
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cmd.PrintErrf("An error occurred: %s\n", retErr)
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cmd.PrintErrln("Attempting to roll back.")
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_ = runDown(cmd, []string{})
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cmd.PrintErrf("Rollback succeeded.\n\n")
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}
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}()
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newDialer := func(validator *cloudcmd.Validator) *dialer.Dialer {
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return dialer.New(nil, validator.V(cmd), &net.Dialer{})
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}
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m.log.Debugf("Created new dialer")
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cmd.Flags().String("master-secret", "", "")
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cmd.Flags().String("endpoint", "", "")
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cmd.Flags().Bool("conformance", false, "")
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log, err := newCLILogger(cmd)
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if err != nil {
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return fmt.Errorf("creating logger: %w", err)
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}
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m.log.Debugf("Created new logger")
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defer log.Sync()
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i := &initCmd{log: log, merger: &kubeconfigMerger{log: log}, spinner: spinner}
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if err := i.initialize(cmd, newDialer, fileHandler, license.NewClient()); err != nil {
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return err
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}
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m.log.Debugf("Initialized mini cluster")
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return nil
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}
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