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JVM debug logs are not redirerected to the elasticsearch log #50156

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jkakavas opened this issue Dec 12, 2019 · 4 comments · Fixed by #50259
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JVM debug logs are not redirerected to the elasticsearch log #50156

jkakavas opened this issue Dec 12, 2019 · 4 comments · Fixed by #50259
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:Core/Infra/Logging Log management and logging utilities >docs General docs changes :Security/Authentication Logging in, Usernames/passwords, Realms (Native/LDAP/AD/SAML/PKI/etc)

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@jkakavas
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JVM debug logs ( such as the logs produced by setting -Dsun.security.krb5.debug=true or
-Dsun.security.spnego.debug=true ) are only printed in stdout and are not redirected to the elasticsearch log.

These are crucial for Kerberos troubleshooting as these are the only actionable information we can get from Java GSS. In general though, it might also make sense for other JVM related logs to be redirected to elasticsearch.log and we could add a proxy in code to make writing to stdout go to the log.

At a bare minimum, we should update https://www.elastic.co/guide/en/elasticsearch/reference/7.5/trb-security-kerberos.html to point out that after enabling the debug logs, these logs can be found in stdout when running elasticsearch with the bin/elasticsearch script , in the systemd journal for elasticsearch.service when running with systemd and in docker logs when running elasticsearch in docker container.
@jkakavas jkakavas added >docs General docs changes :Core/Infra/Logging Log management and logging utilities :Security/Authentication Logging in, Usernames/passwords, Realms (Native/LDAP/AD/SAML/PKI/etc) labels Dec 12, 2019
@elasticmachine
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Pinging @elastic/es-security (:Security/Authentication)

@elasticmachine
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Pinging @elastic/es-core-infra (:Core/Infra/Logging)

@elasticmachine
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Pinging @elastic/es-docs (>docs)

@albertzaharovits
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Good catch 👍
Given the general direction of formatting the logs to be machine readable, as JSON documents, I would lean towards documenting it to avoid of spoiling it for the parsers.

rjernst added a commit to rjernst/elasticsearch that referenced this issue Dec 17, 2019
@rjernst
Capture stdout and stderr to log4j log
37c2672 
This commit overrides the stdout and stderr print streams to be
redirected to the main elasticsearch.log file. While the Elasticsearch
project ensures stdout and stderr are not written to, the jdk or 3rd
party libs may do this, which can be unexepected for users used to
looking the elasticsearch log.

closes elastic#50156
@rjernst rjernst mentioned this issue Dec 17, 2019
Merged
rjernst added a commit that referenced this issue Jan 25, 2020
@rjernst
Capture stdout and stderr to log4j log (#50259)
0ec74f8 
This commit overrides the stdout and stderr print streams to be
redirected to the main elasticsearch.log file. While the Elasticsearch
project ensures stdout and stderr are not written to, the jdk or 3rd
party libs may do this, which can be unexepected for users used to
looking the elasticsearch log.

closes #50156
rjernst added a commit that referenced this issue Jan 25, 2020
@rjernst
Capture stdout and stderr to log4j log (#50259)
a564cac 
This commit overrides the stdout and stderr print streams to be
redirected to the main elasticsearch.log file. While the Elasticsearch
project ensures stdout and stderr are not written to, the jdk or 3rd
party libs may do this, which can be unexepected for users used to
looking the elasticsearch log.

closes #50156
@codebrain codebrain mentioned this issue Apr 1, 2020
Closed
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Capture stdout and stderr to log4j log rjernst/elasticsearch
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@albertzaharovits @jkakavas @elasticmachine