832f607433
This adds a `nomad alloc stop` command that can be used to stop and force migrate an allocation to a different node. This is built on top of the AllocUpdateDesiredTransitionRequest and explicitly limits the scope of access to that transition to expose it under the alloc-lifecycle ACL. The API returns the follow up eval that can be used as part of monitoring in the CLI or parsed and used in an external tool.
129 lines
3 KiB
Go
129 lines
3 KiB
Go
package command
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import (
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"fmt"
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"strings"
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)
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type AllocStopCommand struct {
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Meta
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}
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func (a *AllocStopCommand) Help() string {
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helpText := `
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Usage: nomad alloc stop [options] <allocation>
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Alias: nomad stop
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stop an existing allocation. This command is used to signal a specific alloc
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to shut down. When the allocation has been shut down, it will then be
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rescheduled. An interactive monitoring session will display log lines as the
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allocation completes shutting down. It is safe to exit the monitor early with
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ctrl-c.
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General Options:
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` + generalOptionsUsage() + `
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Stop Specific Options:
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-detach
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Return immediately instead of entering monitor mode. After the
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stop command is submitted, a new evaluation ID is printed to the
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screen, which can be used to examine the rescheduling evaluation using the
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eval-status command.
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-verbose
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Show full information.
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`
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return strings.TrimSpace(helpText)
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}
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func (c *AllocStopCommand) Name() string { return "alloc stop" }
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func (c *AllocStopCommand) Run(args []string) int {
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var detach, verbose 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(&detach, "detach", false, "")
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flags.BoolVar(&verbose, "verbose", false, "")
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if err := flags.Parse(args); err != nil {
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return 1
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}
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// Check that we got exactly one alloc
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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 one argument: <alloc-id>")
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c.Ui.Error(commandErrorText(c))
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return 1
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}
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allocID := args[0]
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// Truncate the id unless full length is requested
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length := shortId
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if verbose {
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length = fullId
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}
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// Query the allocation info
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if len(allocID) == 1 {
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c.Ui.Error(fmt.Sprintf("Alloc ID must contain at least two characters."))
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return 1
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}
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allocID = sanitizeUUIDPrefix(allocID)
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// Get the HTTP 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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allocs, _, err := client.Allocations().PrefixList(allocID)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error querying allocation: %v", err))
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return 1
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}
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if len(allocs) == 0 {
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c.Ui.Error(fmt.Sprintf("No allocation(s) with prefix or id %q found", allocID))
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return 1
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}
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if len(allocs) > 1 {
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// Format the allocs
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out := formatAllocListStubs(allocs, verbose, length)
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c.Ui.Error(fmt.Sprintf("Prefix matched multiple allocations\n\n%s", out))
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return 1
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}
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// Prefix lookup matched a single allocation
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alloc, _, err := client.Allocations().Info(allocs[0].ID, nil)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error querying allocation: %s", err))
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return 1
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}
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resp, err := client.Allocations().Stop(alloc, nil)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error stopping allocation: %s", err))
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return 1
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}
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if detach {
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c.Ui.Output(resp.EvalID)
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return 0
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}
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mon := newMonitor(c.Ui, client, length)
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return mon.monitor(resp.EvalID, false)
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}
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func (a *AllocStopCommand) Synopsis() string {
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return "Stop and reschedule a running allocation"
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}
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