56 lines
2.2 KiB
Plaintext
56 lines
2.2 KiB
Plaintext
[role="xpack"]
|
|
[testenv="basic"]
|
|
[[overview-index-lifecycle-management]]
|
|
== {ilm-init} overview
|
|
|
|
++++
|
|
<titleabbrev>Overview</titleabbrev>
|
|
++++
|
|
|
|
You can create and apply {ilm-cap} ({ilm-init}) policies to automatically manage your indices
|
|
according to your performance, resiliency, and retention requirements.
|
|
Index lifecycle policies can trigger actions such as:
|
|
|
|
* **Rollover**:
|
|
include::../glossary.asciidoc[tag=rollover-def-short]
|
|
* **Shrink**:
|
|
include::../glossary.asciidoc[tag=shrink-def-short]
|
|
* **Force merge**:
|
|
include::../glossary.asciidoc[tag=force-merge-def-short]
|
|
* **Freeze**:
|
|
include::../glossary.asciidoc[tag=freeze-def-short]
|
|
* **Delete**: Permanently remove an index, including all of its data and metadata.
|
|
|
|
{ilm-init} makes it easier to manage indices in hot-warm-cold architectures,
|
|
which are common when you're working with time-series data such as logs and metrics.
|
|
|
|
You can specify:
|
|
|
|
* The maximum shard size, number of documents, or age at which you want to roll over to a new index.
|
|
* The point at which the index is no longer being updated and the number of
|
|
primary shards can be reduced.
|
|
* When to force a merge to permanently remove documents marked for deletion.
|
|
* The point at which the index can be moved to less performant hardware.
|
|
* The point at which the availability is not as critical and the number of
|
|
replicas can be reduced.
|
|
* When the index can be safely deleted.
|
|
|
|
For example, if you are indexing metrics data from a fleet of ATMs into
|
|
Elasticsearch, you might define a policy that says:
|
|
|
|
. When the index reaches 50GB, roll over to a new index.
|
|
. Move the old index into the warm stage, mark it read only, and shrink it down
|
|
to a single shard.
|
|
. After 7 days, move the index into the cold stage and move it to less expensive
|
|
hardware.
|
|
. Delete the index once the required 30 day retention period is reached.
|
|
|
|
[IMPORTANT]
|
|
===========================
|
|
To use {ilm-init}, all nodes in a cluster must run the same version.
|
|
Although it might be possible to create and apply policies in a mixed-version cluster,
|
|
there is no guarantee they will work as intended.
|
|
Attempting to use a policy that contains actions that aren't
|
|
supported on all nodes in a cluster will cause errors.
|
|
===========================
|