+`LTTNG_ABORT_ON_ERROR`::
+ Set to `1` to abort the process after the first error is
+ encountered.
+
+`LTTNG_NETWORK_SOCKET_TIMEOUT`::
+ Socket connection, receive, and send timeout (milliseconds).
++
+Set to `0` or `-1` to set an infinite timeout (default).
+
+`LTTNG_RELAYD_DISALLOW_CLEAR`::
+ Set to `1` to disallow clearing operations (see man:lttng-clear(1)).
++
+The option:--disallow-clear option overrides this environment variable.
+
+`LTTNG_RELAYD_HEALTH`::
+ Path to the health check socket of the relay daemon.
+
+`LTTNG_RELAYD_TCP_KEEP_ALIVE`::
+ Set to `1` to enable TCP keep-alive.
++
+The TCP keep-alive mechanism allows the detection of dead peers
+(man:lttng-sessiond(8)) in cases of unclean termination (for example, a
+hard reset) of a peer.
++
+Supported on Linux and Solaris only. The default behaviour of the TCP
+keep-alive mechanism is OS-specific.
++
+Search for `tcp_keepalive` in man:tcp(7) to learn more.
+
+`LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD`::
+ The time threshold (seconds) to abort a TCP connection after the
+ keep-alive probing mechanism has failed.
++
+Set to `0` or `-1` to use the value chosen by the operating system
+(default).
++
+Supported on Solaris 11 only.
++
+Search for `tcp_keepalive_abort_threshold` in man:tcp(7) to learn more.
+
+`LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME`::
+ Number of seconds a connection needs to be idle before TCP begins
+ sending out keep-alive probes.
++
+Set to `0` or `-1` to use the value chosen by the operating system
+(default).
++
+Supported on Linux and Solaris 11 only.
++
+On Solaris{nbsp}11, the accepted values are `-1`, `0`, and `10` to
+`864000`.
++
+Search for `tcp_keepalive_time` and `tcp_keepalive_interval`
+in man:tcp(7) on Solaris{nbsp}11 to learn more.
+
+`LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT`::
+ Maximum number of TCP keep-alive probes to send before giving up and
+ killing the connection if no response is obtained from the other end.
++
+Set to `0` or `-1` to use the value chosen by the operating system
+(default).
++
+Supported on Linux only.
++
+Search for `tcp_keepalive_probes` in man:tcp(7) to learn more.
+
+`LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL`::
+ Number of seconds between TCP keep-alive probes.
++
+Set to `0` or `-1` to use the value chosen by the operating system
+(default).
++
+Supported on Linux only.
++
+Search for `tcp_keepalive_intvl` in man:tcp(7) to learn more.
+
+`LTTNG_RELAYD_WORKING_DIRECTORY`::
+ Working directory of the processes the relay daemon creates.
++
+The option:--working-directory option overrides this environment
+variable.
+
+
+FILES
+-----
+`$LTTNG_HOME/.lttng`::
+ Unix user's LTTng runtime and configuration directory.
+
+`$LTTNG_HOME/lttng-traces`::
+ Default base output directory of LTTng traces.
++
+Override this path with the option:--output option.