150 lines
3.8 KiB
Go
150 lines
3.8 KiB
Go
package command
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import (
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"fmt"
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"io"
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"os"
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"strings"
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"time"
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"github.com/hashicorp/nomad/api"
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"github.com/posener/complete"
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)
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type OperatorSnapshotSaveCommand struct {
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Meta
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}
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func (c *OperatorSnapshotSaveCommand) Help() string {
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helpText := `
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Usage: nomad operator snapshot save [options] <file>
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Retrieves an atomic, point-in-time snapshot of the state of the Nomad servers
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which includes jobs, nodes, allocations, periodic jobs, and ACLs.
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If ACLs are enabled, a management token must be supplied in order to perform
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snapshot operations.
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To create a snapshot from the leader server and save it to "backup.snap":
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$ nomad snapshot save backup.snap
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To create a potentially stale snapshot from any available server (useful if no
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leader is available):
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$ nomad snapshot save -stale backup.snap
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This is useful for situations where a cluster is in a degraded state and no
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leader is available. To target a specific server for a snapshot, you can run
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the 'nomad operator snapshot save' command on that specific server.
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General Options:
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` + generalOptionsUsage() + `
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Snapshot Save Options:
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-stale=[true|false]
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The -stale argument defaults to "false" which means the leader provides the
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result. If the cluster is in an outage state without a leader, you may need
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to set -stale to "true" to get the configuration from a non-leader server.
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`
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return strings.TrimSpace(helpText)
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}
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func (c *OperatorSnapshotSaveCommand) AutocompleteFlags() complete.Flags {
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return mergeAutocompleteFlags(c.Meta.AutocompleteFlags(FlagSetClient),
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complete.Flags{
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"-stale": complete.PredictAnything,
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})
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}
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func (c *OperatorSnapshotSaveCommand) AutocompleteArgs() complete.Predictor {
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return complete.PredictNothing
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}
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func (c *OperatorSnapshotSaveCommand) Synopsis() string {
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return "Saves snapshot of Nomad server state"
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}
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func (c *OperatorSnapshotSaveCommand) Name() string { return "operator snapshot save" }
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func (c *OperatorSnapshotSaveCommand) Run(args []string) int {
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var stale bool
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flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
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flags.Usage = func() { c.Ui.Output(c.Help()) }
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flags.BoolVar(&stale, "stale", false, "")
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if err := flags.Parse(args); err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to parse args: %v", err))
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return 1
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}
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// Check for misuse
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// Check that we either got no filename or exactly one.
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args = flags.Args()
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if len(args) > 1 {
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c.Ui.Error("This command takes either no arguments or one: <filename>")
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c.Ui.Error(commandErrorText(c))
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return 1
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}
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now := time.Now()
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filename := fmt.Sprintf("nomad-state-%04d%02d%0d-%d.snap", now.Year(), now.Month(), now.Day(), now.Unix())
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if len(args) == 1 {
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filename = args[0]
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}
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if _, err := os.Lstat(filename); err == nil {
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c.Ui.Error(fmt.Sprintf("Destination file already exists: %q", filename))
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c.Ui.Error(commandErrorText(c))
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return 1
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} else if !os.IsNotExist(err) {
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c.Ui.Error(fmt.Sprintf("Unexpected failure checking %q: %v", filename, err))
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return 1
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}
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// Set up a client.
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client, err := c.Meta.Client()
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
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return 1
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}
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tmpFile, err := os.Create(filename + ".tmp")
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to create file: %v", err))
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return 1
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}
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// Fetch the current configuration.
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q := &api.QueryOptions{
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AllowStale: stale,
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}
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snapIn, err := client.Operator().Snapshot(q)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to get snapshot file: %v", err))
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return 1
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}
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defer snapIn.Close()
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_, err = io.Copy(tmpFile, snapIn)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Filed to download snapshot file: %v", err))
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return 1
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}
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err = os.Rename(tmpFile.Name(), filename)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Filed to finalize snapshot file: %v", err))
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return 1
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}
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c.Ui.Output(fmt.Sprintf("State file written to %v", filename))
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return 0
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}
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