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alloc_restart.go
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alloc_restart.go
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package command
import (
"fmt"
"strings"
"github.com/hashicorp/nomad/api"
"github.com/hashicorp/nomad/api/contexts"
"github.com/posener/complete"
)
type AllocRestartCommand struct {
Meta
}
func (c *AllocRestartCommand) Help() string {
helpText := `
Usage: nomad alloc restart [options] <allocation> <task>
Restart an existing allocation. This command is used to restart a specific alloc
and its tasks. If no task is provided then all of the allocation's tasks that
are currently running will be restarted.
Use the option '-all-tasks' to restart tasks that have already run, such as
non-sidecar prestart and poststart tasks.
When ACLs are enabled, this command requires a token with the
'alloc-lifecycle', 'read-job', and 'list-jobs' capabilities for the
allocation's namespace.
General Options:
` + generalOptionsUsage(usageOptsDefault) + `
Restart Specific Options:
-all-tasks
If set, all tasks in the allocation will be restarted, even the ones that
already ran. This option cannot be used with '-task' or the '<task>'
argument.
-task <task-name>
Specify the individual task to restart. If task name is given with both an
argument and the '-task' option, preference is given to the '-task' option.
This option cannot be used with '-all-tasks'.
-verbose
Show full information.
`
return strings.TrimSpace(helpText)
}
func (c *AllocRestartCommand) Name() string { return "alloc restart" }
func (c *AllocRestartCommand) Run(args []string) int {
var allTasks, verbose bool
var task string
flags := c.Meta.FlagSet(c.Name(), FlagSetClient)
flags.Usage = func() { c.Ui.Output(c.Help()) }
flags.BoolVar(&allTasks, "all-tasks", false, "")
flags.BoolVar(&verbose, "verbose", false, "")
flags.StringVar(&task, "task", "", "")
if err := flags.Parse(args); err != nil {
return 1
}
// Check that we got exactly one alloc
args = flags.Args()
if len(args) < 1 || len(args) > 2 {
c.Ui.Error("This command takes one or two arguments: <alloc-id> <task-name>")
c.Ui.Error(commandErrorText(c))
return 1
}
allocID := args[0]
// If -task isn't provided fallback to reading the task name
// from args.
if task == "" && len(args) >= 2 {
task = args[1]
}
if allTasks && task != "" {
c.Ui.Error("The -all-tasks option is not allowed when restarting a specific task.")
return 1
}
// Truncate the id unless full length is requested
length := shortId
if verbose {
length = fullId
}
// Query the allocation info
if len(allocID) == 1 {
c.Ui.Error("Alloc ID must contain at least two characters.")
return 1
}
allocID = sanitizeUUIDPrefix(allocID)
// Get the HTTP client
client, err := c.Meta.Client()
if err != nil {
c.Ui.Error(fmt.Sprintf("Error initializing client: %s", err))
return 1
}
allocs, _, err := client.Allocations().PrefixList(allocID)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error querying allocation: %v", err))
return 1
}
if len(allocs) == 0 {
c.Ui.Error(fmt.Sprintf("No allocation(s) with prefix or id %q found", allocID))
return 1
}
if len(allocs) > 1 {
// Format the allocs
out := formatAllocListStubs(allocs, verbose, length)
c.Ui.Error(fmt.Sprintf("Prefix matched multiple allocations\n\n%s", out))
return 1
}
// Prefix lookup matched a single allocation
q := &api.QueryOptions{Namespace: allocs[0].Namespace}
alloc, _, err := client.Allocations().Info(allocs[0].ID, q)
if err != nil {
c.Ui.Error(fmt.Sprintf("Error querying allocation: %s", err))
return 1
}
if task != "" {
err := validateTaskExistsInAllocation(task, alloc)
if err != nil {
c.Ui.Error(err.Error())
return 1
}
}
if allTasks {
err = client.Allocations().RestartAllTasks(alloc, nil)
} else {
err = client.Allocations().Restart(alloc, task, nil)
}
if err != nil {
target := "allocation"
if task != "" {
target = "task"
}
c.Ui.Error(fmt.Sprintf("Failed to restart %s:\n\n%s", target, err.Error()))
return 1
}
return 0
}
func validateTaskExistsInAllocation(taskName string, alloc *api.Allocation) error {
tg := alloc.Job.LookupTaskGroup(alloc.TaskGroup)
if tg == nil {
return fmt.Errorf("Could not find allocation task group: %s", alloc.TaskGroup)
}
foundTaskNames := make([]string, len(tg.Tasks))
for i, task := range tg.Tasks {
foundTaskNames[i] = task.Name
if task.Name == taskName {
return nil
}
}
return fmt.Errorf("Could not find task named: %s, found:\n%s", taskName, formatList(foundTaskNames))
}
func (c *AllocRestartCommand) Synopsis() string {
return "Restart a running allocation"
}
func (c *AllocRestartCommand) AutocompleteArgs() complete.Predictor {
// Here we attempt to autocomplete allocations for any position of arg.
// We should eventually try to auto complete the task name if the arg is
// at position 2.
return complete.PredictFunc(func(a complete.Args) []string {
client, err := c.Meta.Client()
if err != nil {
return nil
}
resp, _, err := client.Search().PrefixSearch(a.Last, contexts.Allocs, nil)
if err != nil {
return []string{}
}
return resp.Matches[contexts.Allocs]
})
}