This question was asked by a user trying to debug a problem with Java services
which required JAVA_HOME to be set.
---
v2 Change the word "set" to "inherited (from PID1)" for clarity as to their
default values.
man/systemd.exec.xml | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index c0e1d86..53a6eaf 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -77,6 +77,14 @@
configuration options are configured in the [Service],
[Socket], [Mount], or [Swap] sections, depending on the unit
type.</para>
+
+ <para>All processes are executed in a clean environment in
+ which only the TERM, PATH, USER, and HOME variables are
+ inherited (from PID1) by default. In order to set additional
+ variables, see the Environment= and EnvironmentFile= options
+ below. To specify variables globally, you can configure
+ DefaultEnvironment= in
+
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
</refsect1>
<refsect1>
--
1.8.3.4
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