Wei-Chiu Chuang created HDDS-14486:
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Summary: [Website v2] [Docs] [Administrator Guide] Environment
variables
Key: HDDS-14486
URL: https://issues.apache.org/jira/browse/HDDS-14486
Project: Apache Ozone
Issue Type: Sub-task
Components: documentation
Reporter: Wei-Chiu Chuang
Add a page in Administrator Guide -> Configuration -> Basic, after
Configuration Files, to describe ozone-env.sh and environment variables.
The ozone-env.sh is located at $OZONE_HOME/etc/hadoop. It defines the
environment variables used by Ozone processes. There are a lot of environment
variables, and the only required ones are `JAVA_HOME`.
Some env variables may be applicable to all Ozone processes, such as JAVA_HOME,
OZONE_HOME, OZONE_CONF_DIR, OZONE_LOG_DIR, OZONE_HEAPSIZE_MAX and
OZONE_HEAPSIZE_MIN. Others may only apply to certain service. For example,
OZONE_CLIENT_OPTS specifies Java properties for ozone commands and clients;
similarly, OZONE_OM_OPTS for OM, OZONE_SCM_OPTS for SCM, OZONE_DATANODE_OPTS
for Datanode, OZONE_S3G_OPTS for s3 gateway, OZONE_RECON_OPTS for Recon server.
Instead of updating ozone-env.sh, create a system wide profile, say
/etc/profile.d/ozone.sh. And then add the following as an example:
```
export JAVA_HOME="$(/usr/libexec/java_home)"
export OZONE_HOME=/opt/ozone
export OZONE_CONF_DIR=/etc/ozone/conf
```
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