OpenSearch/docs/reference/ilm/start-stop.asciidoc

[role="xpack"]
[testenv="basic"]
[[start-stop-ilm]]
== Start and stop {ilm}

By default, the {ilm-init} service is in the `RUNNING` state and manages 
all indices that have lifecycle policies. 

You can stop {ilm} to suspend management operations for all indices.
For example, you might stop {ilm} when performing scheduled maintenance or making
changes to the cluster that could impact the execution of {ilm-init} actions.

IMPORTANT: When you stop {ilm-init}, <<snapshot-lifecycle-management, {slm-init}>> 
operations are also suspended. 
No snapshots will be taken as scheduled until you restart {ilm-init}.
In-progress snapshots are not affected.

[discrete]
[[get-ilm-status]]
=== Get {ilm-init} status

To see the current status of the {ilm-init} service, use the <<ilm-get-status,Get Status API>>:

////
[source,console]
--------------------------------------------------
PUT _ilm/policy/my_policy
{
  "policy": {
    "phases": {
      "warm": {
        "min_age": "10d",
        "actions": {
          "forcemerge": {
            "max_num_segments": 1
          }
        }
      },
      "delete": {
        "min_age": "30d",
        "actions": {
          "delete": {}
        }
      }
    }
  }
}

PUT my-index-000001
{
  "settings": {
    "index.lifecycle.name": "my_policy"
  }
}
--------------------------------------------------
////

[source,console]
--------------------------------------------------
GET _ilm/status
--------------------------------------------------

Under normal operation, the response shows {ilm-init} is `RUNNING`:

[source,console-result]
--------------------------------------------------
{
  "operation_mode": "RUNNING"
}
--------------------------------------------------



[discrete]
[[stop-ilm]]
=== Stop {ilm-init}

To stop the {ilm-init} service and pause execution of all lifecycle policies, 
use the <<ilm-stop,Stop API>>:

[source,console]
--------------------------------------------------
POST _ilm/stop
--------------------------------------------------
// TEST[continued]

{ilm-init} service runs all policies to a point where it is safe to stop. 
While the {ilm-init} service is shutting down, 
the status API shows {ilm-init} is in the `STOPPING` mode:

////
[source,console]
--------------------------------------------------
GET _ilm/status
--------------------------------------------------
// TEST[continued]
////

[source,console-result]
--------------------------------------------------
{
  "operation_mode": "STOPPING"
}
--------------------------------------------------
// TESTRESPONSE[s/"STOPPING"/$body.operation_mode/]

Once all policies are at a safe stopping point, {ilm-init} moves into the `STOPPED` mode:

////
[source,console]
--------------------------------------------------
PUT trigger_ilm_cs_action

GET _ilm/status
--------------------------------------------------
// TEST[continued]
////

[source,console-result]
--------------------------------------------------
{
  "operation_mode": "STOPPED"
}
--------------------------------------------------
// TESTRESPONSE[s/"STOPPED"/$body.operation_mode/]

[discrete]
=== Start {ilm-init}

To restart {ilm-init} and resume executing policies, use the <<ilm-start, Start API>>.
This puts the  {ilm-init} service in the `RUNNING` state and 
{ilm-init} begins executing policies from where it left off.

[source,console]
--------------------------------------------------
POST _ilm/start
--------------------------------------------------
// TEST[continued]