338 lines
12 KiB
Go
338 lines
12 KiB
Go
package command
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import (
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"fmt"
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"io/ioutil"
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"os"
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"strings"
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)
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const (
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// DefaultInitName is the default name we use when
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// initializing the example file
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DefaultInitName = "example.nomad"
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)
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// InitCommand generates a new job template that you can customize to your
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// liking, like vagrant init
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type InitCommand struct {
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Meta
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}
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func (c *InitCommand) Help() string {
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helpText := `
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Usage: nomad init
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Creates an example job file that can be used as a starting
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point to customize further.
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`
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return strings.TrimSpace(helpText)
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}
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func (c *InitCommand) Synopsis() string {
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return "Create an example job file"
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}
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func (c *InitCommand) Run(args []string) int {
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// Check for misuse
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if len(args) != 0 {
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c.Ui.Error(c.Help())
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return 1
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}
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// Check if the file already exists
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_, err := os.Stat(DefaultInitName)
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if err != nil && !os.IsNotExist(err) {
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c.Ui.Error(fmt.Sprintf("Failed to stat '%s': %v", DefaultInitName, err))
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return 1
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}
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if !os.IsNotExist(err) {
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c.Ui.Error(fmt.Sprintf("Job '%s' already exists", DefaultInitName))
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return 1
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}
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// Write out the example
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err = ioutil.WriteFile(DefaultInitName, []byte(defaultJob), 0660)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Failed to write '%s': %v", DefaultInitName, err))
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return 1
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}
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// Success
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c.Ui.Output(fmt.Sprintf("Example job file written to %s", DefaultInitName))
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return 0
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}
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var defaultJob = strings.TrimSpace(`
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# There can only be a single job definition per file. This job is named
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# "example" so it will create a job with the ID and Name "example".
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# The "job" stanza is the top-most configuration option in the job
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# specification. A job is a declarative specification of tasks that Nomad
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# should run. Jobs have a globally unique name, one or many task groups, which
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# are themselves collections of one or many tasks.
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#
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# For more information and examples on the "job" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/job.html
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#
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job "example" {
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# The "region" parameter specifies the region in which to execute the job. If
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# omitted, this inherits the default region name of "global".
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# region = "global"
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# The "datacenters" parameter specifies the list of datacenters which should
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# be considered when placing this task. This must be provided.
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datacenters = ["dc1"]
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# The "type" parameter controls the type of job, which impacts the scheduler's
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# decision on placement. This configuration is optional and defaults to
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# "service". For a full list of job types and their differences, please see
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# the online documentation.
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#
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# For more information, please see the online documentation at:
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#
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# https://www.nomadproject.io/docs/jobspec/schedulers.html
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#
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type = "service"
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# The "constraint" stanza defines additional constraints for placing this job,
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# in addition to any resource or driver constraints. This stanza may be placed
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# at the "job", "group", or "task" level, and supports variable interpolation.
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#
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# For more information and examples on the "constraint" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/constraint.html
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#
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# constraint {
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# attribute = "${attr.kernel.name}"
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# value = "linux"
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# }
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# The "update" stanza specifies the job update strategy. The update strategy
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# is used to control things like rolling upgrades. If omitted, rolling
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# updates are disabled.
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#
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# For more information and examples on the "update" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/update.html
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#
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update {
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# The "stagger" parameter specifies to do rolling updates of this job every
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# 10 seconds.
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stagger = "10s"
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# The "max_parallel" parameter specifies the maximum number of updates to
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# perform in parallel. In this case, this specifies to update a single task
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# at a time.
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max_parallel = 1
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}
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# The "group" stanza defines a series of tasks that should be co-located on
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# the same Nomad client. Any task within a group will be placed on the same
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# client.
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#
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# For more information and examples on the "group" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/group.html
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#
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group "cache" {
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# The "count" parameter specifies the number of the task groups that should
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# be running under this group. This value must be non-negative and defaults
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# to 1.
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count = 1
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# The "restart" stanza configures a group's behavior on task failure. If
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# left unspecified, a default restart policy is used based on the job type.
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#
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# For more information and examples on the "restart" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/restart.html
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#
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restart {
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# The number of attempts to run the job within the specified interval.
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attempts = 10
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interval = "5m"
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# The "delay" parameter specifies the duration to wait before restarting
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# a task after it has failed.
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delay = "25s"
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# The "mode" parameter controls what happens when a task has restarted
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# "attempts" times within the interval. "delay" mode delays the next
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# restart until the next interval. "fail" mode does not restart the task
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# if "attempts" has been hit within the interval.
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mode = "delay"
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}
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# The "ephemeral_disk" stanza instructs Nomad to utilize an ephemeral disk
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# instead of a hard disk requirement. Clients using this stanza should
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# not specify disk requirements in the resources stanza of the task. All
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# tasks in this group will share the same ephemeral disk.
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#
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# For more information and examples on the "ephemeral_disk" stanza, please
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# see the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/ephemeral_disk.html
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#
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ephemeral_disk {
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# When sticky is true and the task group is updated, the scheduler
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# will prefer to place the updated allocation on the same node and
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# will migrate the data. This is useful for tasks that store data
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# that should persist across allocation updates.
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# sticky = true
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#
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# Setting migrate to true results in the allocation directory of a
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# sticky allocation directory to be migrated.
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# migrate = true
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# The "size" parameter specifies the size in MB of shared ephemeral disk
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# between tasks in the group.
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size = 300
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}
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# The "task" stanza creates an individual unit of work, such as a Docker
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# container, web application, or batch processing.
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#
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# For more information and examples on the "task" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/task.html
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#
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task "redis" {
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# The "driver" parameter specifies the task driver that should be used to
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# run the task.
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driver = "docker"
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# The "config" stanza specifies the driver configuration, which is passed
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# directly to the driver to start the task. The details of configurations
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# are specific to each driver, so please see specific driver
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# documentation for more information.
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config {
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image = "redis:3.2"
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port_map {
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db = 6379
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}
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}
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# The "artifact" stanza instructs Nomad to download an artifact from a
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# remote source prior to starting the task. This provides a convenient
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# mechanism for downloading configuration files or data needed to run the
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# task. It is possible to specify the "artifact" stanza multiple times to
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# download multiple artifacts.
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#
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# For more information and examples on the "artifact" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/artifact.html
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#
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# artifact {
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# source = "http://foo.com/artifact.tar.gz"
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# options {
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# checksum = "md5:c4aa853ad2215426eb7d70a21922e794"
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# }
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# }
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# The "logs" stana instructs the Nomad client on how many log files and
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# the maximum size of those logs files to retain. Logging is enabled by
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# default, but the "logs" stanza allows for finer-grained control over
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# the log rotation and storage configuration.
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#
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# For more information and examples on the "logs" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/logs.html
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#
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# logs {
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# max_files = 10
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# max_file_size = 15
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# }
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# The "resources" stanza describes the requirements a task needs to
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# execute. Resource requirements include memory, disk space, network,
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# cpu, and more. This ensures the task will execute on a machine that
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# contains enough resource capacity.
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#
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# For more information and examples on the "resources" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/resources.html
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#
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resources {
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cpu = 500 # 500 MHz
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memory = 256 # 256MB
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network {
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mbits = 10
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port "db" {}
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}
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}
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# The "service" stanza instructs Nomad to register this task as a service
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# in the service discovery engine, which is currently Consul. This will
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# make the service addressable after Nomad has placed it on a host and
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# port.
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#
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# For more information and examples on the "service" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/service.html
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#
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service {
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name = "global-redis-check"
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tags = ["global", "cache"]
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port = "db"
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check {
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name = "alive"
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type = "tcp"
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interval = "10s"
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timeout = "2s"
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}
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}
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# The "template" stanza instructs Nomad to manage a template, such as
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# a configuration file or script. This template can optionally pull data
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# from Consul or Vault to populate runtime configuration data.
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#
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# For more information and examples on the "template" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/template.html
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#
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# template {
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# data = "---\nkey: {{ key \"service/my-key\" }}"
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# destination = "local/file.yml"
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# change_mode = "signal"
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# change_signal = "SIGHUP"
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# }
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# The "vault" stanza instructs the Nomad client to acquire a token from
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# a HashiCorp Vault server. The Nomad servers must be configured and
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# authorized to communicate with Vault. By default, Nomad will inject
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# The token into the job via an environment variable and make the token
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# available to the "template" stanza. The Nomad client handles the renewal
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# and revocation of the Vault token.
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#
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# For more information and examples on the "vault" stanza, please see
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# the online documentation at:
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#
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# https://www.nomadproject.io/docs/job-specification/vault.html
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#
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# vault {
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# policies = ["cdn", "frontend"]
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# change_mode = "signal"
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# change_signal = "SIGHUP"
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# }
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# Controls the timeout between signalling a task it will be killed
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# and killing the task. If not set a default is used.
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# kill_timeout = "20s"
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}
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}
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}
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`)
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