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On some Linux distributions tmpfiles.d cleans files and directories under /tmp if they haven't been accessed for 10 days. This can cause problems for ML as ML is currently the only component that uses the temp directory more than a few seconds after startup. If you didn't open an ML job for 10 days and then tried to open one then the temp directory would have been deleted. This commit prevents the problem occurring in the case of Elasticsearch being managed by systemd, as systemd private temp directories are not subject to periodic cleanup (by default). Additionally there are now some docs to warn people about the risk and suggest a manual mitigation for .tar.gz users.
24 lines
1.2 KiB
Plaintext
24 lines
1.2 KiB
Plaintext
[[es-tmpdir]]
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=== Temp directory
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By default, Elasticsearch uses a private temporary directory that the startup
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script creates immediately below the system temporary directory.
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On some Linux distributions a system utility will clean files and directories
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from `/tmp` if they have not been recently accessed. This can lead to the
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private temporary directory being removed while Elasticsearch is running if
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features that require the temporary directory are not used for a long time.
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This causes problems if a feature that requires the temporary directory is
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subsequently used.
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If you install Elasticsearch using the `.deb` or `.rpm` packages and run it
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under `systemd` then the private temporary directory that Elasticsearch uses
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is excluded from periodic cleanup.
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However, if you intend to run the `.tar.gz` distribution on Linux for an
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extended period then you should consider creating a dedicated temporary
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directory for Elasticsearch that is not under a path that will have old files
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and directories cleaned from it. This directory should have permissions set
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so that only the user that Elasticsearch runs as can access it. Then set the
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`$ES_TMPDIR` environment variable to point to it before starting Elasticsearch.
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