07-19-2001
let me add...
I just want to know if there is some sort of command I could use to launch the http daemon...instead of having to reboot the server to get it started.
Last edited by jskillet; 07-19-2001 at 05:52 PM..
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heart(3erl) Erlang Module Definition heart(3erl)
NAME
heart - Heartbeat Monitoring of an Erlang Runtime System
DESCRIPTION
This modules contains the interface to the heart process. heart sends periodic heartbeats to an external port program, which is also named
heart . The purpose of the heart port program is to check that the Erlang runtime system it is supervising is still running. If the port
program has not received any heartbeats within HEART_BEAT_TIMEOUT seconds (default is 60 seconds), the system can be rebooted. Also, if the
system is equipped with a hardware watchdog timer and is running Solaris, the watchdog can be used to supervise the entire system.
An Erlang runtime system to be monitored by a heart program, should be started with the command line flag -heart (see also erl(1) . The
heart process is then started automatically:
% erl -heart ...
If the system should be rebooted because of missing heart-beats, or a terminated Erlang runtime system, the environment variable HEART_COM-
MAND has to be set before the system is started. If this variable is not set, a warning text will be printed but the system will not
reboot. However, if the hardware watchdog is used, it will trigger a reboot HEART_BEAT_BOOT_DELAY seconds later nevertheless (default is
60).
To reboot on the WINDOWS platform HEART_COMMAND can be set to heart -shutdown (included in the Erlang delivery) or of course to any other
suitable program which can activate a reboot.
The hardware watchdog will not be started under Solaris if the environment variable HW_WD_DISABLE is set.
The HEART_BEAT_TIMEOUT and HEART_BEAT_BOOT_DELAY environment variables can be used to configure the heart timeouts, they can be set in the
operating system shell before Erlang is started or be specified at the command line:
% erl -heart -env HEART_BEAT_TIMEOUT 30 ...
The value (in seconds) must be in the range 10 < X <= 65535.
It should be noted that if the system clock is adjusted with more than HEART_BEAT_TIMEOUT seconds, heart will timeout and try to reboot the
system. This can happen, for example, if the system clock is adjusted automatically by use of NTP (Network Time Protocol).
In the following descriptions, all function fails with reason badarg if heart is not started.
EXPORTS
set_cmd(Cmd) -> ok | {error, {bad_cmd, Cmd}}
Types Cmd = string()
Sets a temporary reboot command. This command is used if a HEART_COMMAND other than the one specified with the environment variable
should be used in order to reboot the system. The new Erlang runtime system will (if it misbehaves) use the environment variable
HEART_COMMAND to reboot.
Limitations: The length of the Cmd command string must be less than 2047 characters.
clear_cmd() -> ok
Clears the temporary boot command. If the system terminates, the normal HEART_COMMAND is used to reboot.
get_cmd() -> {ok, Cmd}
Types Cmd = string()
Get the temporary reboot command. If the command is cleared, the empty string will be returned.
Ericsson AB kernel 2.14.3 heart(3erl)