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watchd is a process watch dog to keep the watched processes alive. the sample config file please see src/sample.conf. config fragment in src/sample.conf: # one section for a group sub processes # you can config more than one sections [test1] # the type: daemon or cron (for crontab) # default: daemon type = daemon # the mode: all or failover ## all: run all subprocess_command ## failover: run the first command, ## run the second command when the first exit, ## run the first command again when the last exit, ## and so on. # default: all mode = failover # if run by shell as: sh -c command ## true or 1: run with sh -c command ## false or 0: run command directly ## auto: auto detect if need run by sh -c # default auto run_by_sh = auto # force restart interval in seconds # this parameter only for daemon # default 0 for never force restart force_restart_interval = 86400 # set environment variable # can ocur more than once set_env = OMP_NUM_THREADS=4 # the command line of sub process # can be a simple command line or a shell command as following four formats: ## 1. (command) ## 2. command > output_filename or command >> output_filename ## 3. command1 | command2 ... ## 4. command & ## the shell command line while be exec as: sh -c command_line subprocess_command = /bin/echo OMP_NUM_THREADS=$OMP_NUM_THREADS $host_index >> /tmp/echo.log # check sub process alive interval in seconds # 0 for never check check_alive_interval = 10 # retry threshold of check alive # kill the sub process when the check fail count exceeds this parameter # default: 3 check_alive_retry_threshold = 3 # check_alive_command can be a command or a library whose filename ends with .so ## the check command output OK for check passed, others for fail # ## the library must export c function: ## int check_alive(int argc, char **argv); ## argv[0] is the library filename, argv[1] is the first parameter and so on. ## return 0 for success, != 0 for fail. ## ## for example: ## #@function REPLACE_VARS ## check_alive_command = /usr/local/lib/libdfscheckalive.so %{encoder_port} 2 30 #@function REPLACE_VARS check_alive_command = echo OK [test2] type = cron subprocess_command = ls -l / >> /tmp/ls.log # the time base to schedule # this parameter only for cron time_base = 00:00 # repeat interval in seconds # this parameter only for cron repeat_interval = 60
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watchd is a process watcher / monitor, so watchd is a process watch dog to keep the watched processes alive.
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