113 lines
3.0 KiB
Plaintext
113 lines
3.0 KiB
Plaintext
[role="xpack"]
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[testenv="basic"]
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[[set-up-lifecycle-policy]]
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== Set up {ilm} policy
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In order for an index to use an {ilm} policy to manage its lifecycle we must
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first define a lifecycle policy for it to use. The following request creates
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a policy called `my_policy` in Elasticsearch which we can later use to manage
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our indexes.
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[source,js]
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------------------------
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PUT _ilm/my_policy
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{
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"policy": {
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"phases": {
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"hot": {
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"actions": {
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"rollover": {
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"max_size": "25GB" <1>
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}
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}
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},
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"delete": {
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"min_age": "30d",
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"actions": {
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"delete": {} <2>
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}
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}
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}
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}
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}
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------------------------
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// CONSOLE
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<1> Rollover the index when it reaches 25GB in size
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<2> Delete the index when its 30 days old
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{ilm} will manage an index using the policy defined in the
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`index.lifecycle.name` index setting. If this setting does not exist in the
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settings for a particular index {ilm} will not manage that index.
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To set the policy for an index there are two options:
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1. Apply the policy to an index template and bootstrap creating the first index
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2. Apply the policy to a new index in a create index request
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=== Applying a policy to an index template
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The `index.lifecycle.name` setting can be set in an index template so that it
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is automatically applied to indexes matching the templates index pattern:
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[source,js]
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-----------------------
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PUT _template/my_template
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{
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"index_patterns": ["test-*"], <1>
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"settings": {
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"number_of_shards": 1,
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"number_of_replicas": 1,
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"index.lifecycle.name": "my_policy", <2>
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"index.lifecycle.rollover_alias": "test-alias"
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}
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}
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-----------------------
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// CONSOLE
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<1> This template will be applied to all indexes which have a name starting
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with `test-`
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<2> The template will set the policy to be used to `my_policy`
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Now that a policy exists and is used in an index template we can create an
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initial index which will be managed by our policy:
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[source,js]
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-----------------------
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PUT test-000001
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{
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"aliases": {
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"test-alias":{
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"is_write_index": true <1>
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}
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}
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}
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-----------------------
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// CONSOLE
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<1> Set this initial index to be the write index for this alias.
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We can now write data to the `test-alias` alias. Because we have a rollover
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action defined in our policy when the index grows larger than 25GB {ilm} will
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create a new index and roll the alias over to use the new index automatically.
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=== Apply a policy to a create index request
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The `index.lifecycle.name` setting can be set on an individual create index
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request so {ilm} immediately starts managing the index:
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[source,js]
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-----------------------
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PUT test-index
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{
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"settings": {
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"number_of_shards": 1,
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"number_of_replicas": 1,
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"index.lifecycle.name": "my_policy"
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}
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}
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-----------------------
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// CONSOLE
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IMPORTANT: Its recommended not to use the create index API with a policy that
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defines a rollover action. If you do so, the new index as the result of the
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rollover will not carry forward the policy. Always use index templates to
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define policies with rollover actions.
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