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In #80617 we upgraded to a version of JNA which would report the message `Failed to allocate closure` if the temp dir for `libffi` did not permit executables (rather than crashing with a segfault). This commit extends the docs to mention this message.
40 lines
2 KiB
Text
40 lines
2 KiB
Text
[[executable-jna-tmpdir]]
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=== Ensure JNA temporary directory permits executables
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[NOTE]
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This is only relevant for Linux.
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{es} uses the Java Native Access (JNA) library, and another library called
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`libffi`, for executing some platform-dependent native code. On Linux, the
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native code backing these libraries is extracted at runtime into a temporary
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directory and then mapped into executable pages in {es}'s address space. This
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requires the underlying files not to be on a filesystem mounted with the
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`noexec` option.
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By default, {es} will create its temporary directory within `/tmp`. However,
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some hardened Linux installations mount `/tmp` with the `noexec` option by
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default. This prevents JNA and `libffi` from working correctly. For instance,
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at startup JNA may fail to load with an `java.lang.UnsatisfiedLinkerError`
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exception or with a message that says something similar to
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`failed to map segment from shared object`, or `libffi` may report a message
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such as `failed to allocate closure`. Note that the exception messages can
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differ between JVM versions. Additionally, the components of {es} that rely on
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execution of native code via JNA may fail with messages indicating that it is
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`because JNA is not available`.
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To resolve these problems, either remove the `noexec` option from your `/tmp`
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filesystem, or configure {es} to use a different location for its temporary
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directory by setting the <<es-tmpdir,`$ES_TMPDIR`>> environment variable. For
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instance:
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["source","sh",subs="attributes"]
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--------------------------------------------
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export ES_TMPDIR=/usr/share/elasticsearch/tmp
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--------------------------------------------
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If you need finer control over the location of these temporary files, you can
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also configure the path that JNA uses with the <<set-jvm-options,JVM flag>>
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`-Djna.tmpdir=<path>` and you can configure the path that `libffi` uses for its
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temporary files by setting the `LIBFFI_TMPDIR` environment variable. Future
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versions of {es} may need additional configuration, so you should prefer to set
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`ES_TMPDIR` wherever possible.
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