Manual Reference Pages - AIRDAEMON (1)
airdaemon - Run a program as a daemon process, restarting it if it dies
airdaemon [--retry RETRY_DELAY] [--retry-max RETRY_MAX_DELAY]
[--pidfile PID_FILE] [--airdaemon-pidfile PID_FILE]
[--log LOG_SPECIFIER] [--loglevel LOG_LEVEL]
[--verbose] [--version] [--no-daemon]
-- PROGRAM [PROGRAM_ARGS]
airdaemon invokes a child process and ensures that it is restarted if it
encounters any errors. The delay between child exit and restart can be
chosen, and can either be constant or exponentially increasing up to a
Use of two dashes (--) after all airdaemon command-line switches allows
PROGRAM_ARGS to be interpreted by the PROGRAM rather than airdaemon itself.
While they are not strictly required if you do not need to pass arguments to
PROGRAM, they should be used for consistency.
Wait RETRY_DELAY seconds after the child process exits abnormally until trying
to restart the child process. See also --retry-max
This parameter, combined with the --retry parameter, facilitates truncated
binary exponential backoff of the retry logic. The first retry attempt will
be delayed by the value of the --retry parameter. If the child process
exits abnormally within this time period, the delay is doubled. Once the
child process survives longer than the value of the --retry parameter, the
retry delay is reset to that value.
For example, assume --retry=30 and --retry-max=240. The first time the
child process exits abnormally, airdaemon will wait 30 seconds before
invoking the child process again. If it exits abnormally again within 30
seconds, airdaemon will wait 60 seconds and try again. If the process
dies again within 30 seconds, the delay doubles again to 120. The process
continues until the delay hits the maximum of 240. Once the child process
survives for 30 seconds, the delay will be reset to the original retry delay
Write the process identifier of the child process to PID_FILE.
Each time the child process is restarted, the process identifier in this file
is updated. This option exists to facilitate the termination of the child
process by shutdown scripts. Note that if the child process terminates
normally during shutdown, airdaemon will terminate normally as well, so it
is usually sufficient just to kill the pid in this file at shutdown.
Write the process identifier of the airdaemon process to PID_FILE.
This option exists to facilitate the termination of the forked
airdaemon process by shutdown scripts.
Do not actually daemonize. Mainly useful for testing/debugging.
These options are used to specify how log messages are routed. airdaemon can
log to standard error, regular files, or the UNIX syslog facility.
Specifies destination for log messages. LOG_SPECIFIER can be a syslog(3)
facility name, the special value stderr for standard error, or the
absolute path to a file for file logging. Standard error logging is only
available in --daemon mode if --foreground is present. The default log
specifier is stderr if available, user otherwise.
Specify minimum level for logged messages. In increasing levels of verbosity,
the supported log levels are quiet, error, critical, warning,
message, info, and debug. The default logging level is warning.
Equivalent to --loglevel debug.
If present, print version and copyright information to standard error and exit.
The following will ping www.cert.org every 15 seconds until ping returns
airdaemon --retry 15 -- ping -c 1 www.cert.org
The same as above, except the delay will double until reaching a maximum of 15
airdaemon --retry 15 --retry-max 900 -- ping -c 1 www.cert.org
Known issues are listed in the README file in the Airframe source
distribution. Note that airdaemon should be considered alpha-quality software;
not every concievable input and aggregation is exhaustively tested at each
release, and specific features may be completely untested. Please be mindful
of this before deploying airdaemon in production environments. Bug reports and
feature requests may be sent via email to <email@example.com>.
Tony Cebzanov and Brian Trammell for the
CERT Network Situational Awareness
|2.8.1 ||AIRDAEMON (1) || 4-Feb-2016 |
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