NAME App::aep - Advanced Entry Point (for docker and other containers) SYNOPSIS From within your dockerfile, simply use cpan or cpanm to add App::aep It should then be possible to use 'aep' as the entrypoint in the dockerfile Please see the EXAMPLES section for a small dockerfile to create a working example DESCRIPTION This app is a dynamic entry point for use in container systems such as docker, unlike most perl modules, this has been created to correctly react to signals so it will respond correctly. Signals passed to this entrypoint will also be passed down to the child. ARGUMENTS config related config-env Default value: disabled Only read command line options from the enviroment config-file Default value: disabled Only read command line options from the enviroment config-args Default value: disabled Only listen to command line arguments config-merge (default) Default value: enabled Merge together env, config and args to generate a config config-order (default) Default value: 'env,conf,args' (left to right) The order to merge options together, environment related env-prefix (default) Default value: aep- When scanning the enviroment aep will look for this prefix to know which environment variables it should pay attention to. Command related (what to run) command (string) What to actually run within the container, default is print aes help. command-args (string) The arguments to add to the command comma seperated, default is nothing. Example: --list,--as-service,--with-long "arg",--foreground command-restart (integer) If the command exits how many times to retry it, default 0 set to -1 for infinate command-restart-delay (integer) The time in milliseconds to wait before retrying the command, default 1000 Lock commands (server) These are for if you have concerns of 'race' conditions. lock-server Default value: disabled Act like a lock server, this means we will expect other aeps to connect to us, we in turn will say when they should actually start, this is to counter-act race issues when starting multi image containers such as docker-compose. lock-server-host (string) What host to bind to, defaults to 0.0.0.0 lock-server-port (integer) What port to bind to, defaults to 60000 lock-server-default-run Default value: disabled If we get sent an ID we do not know what to do with, tell it to run. lock-server-default-ignore Default value: enabled If we get sent an ID we do not know what to do with, ignore it. lock-server-order (string) The list of ids and the order to allow them to run, allows OR || operators, for example: db,redis1||redis2,redis1||redis2,nginx Beware the the lock-server-default-ignore config flag! lock-server-exhaust-action (string) Default value: idle What to do if all clients have been started (list end), options are: * exit- Exit 0 * idle - Do nothing, just sit there doing nothing * restart - Reset the lock-server-order list and continue operating * execute - Read in any passed commands and args and run them like a normal aep Lock commands (client) lock-client Default value: disabled Become a lock client, this will mean your aep will connect to another aep to learn when it should run its command. lock-server-host (string) What host to connect to, defaults to 'aep-master' lock-server-port (integer) What port to connect to, defaults to 60000 lock-trigger (string) Default: none:time:10000 What to look for to know that our target command has executed correctly, if the target command dies or exits before this filter can complete, the success will never be reported, if you have also set restart options the lock-trigger will continue to try to validate the service. The syntax for the filters is: handle:filter:specification handle can be stderr, stdout, both or none So an example for a filter that will match 'now serving requests': both:text:now serving requests Several standard filters are availible: * time - Wait this many milliseconds and then report success. Example: none:time:2000 * regex - Wait till this regex matches to report success. Example: both:regex:ok|success * text - Wait till this line of text is seen. Example: both:text:success * script - Run a script or binary somewhere else on the system and use its exit code to determine success or failure. Example: none:script:/opt/check_state * connect - Try to connect to a tcp port, no data is sent and any recieved is ignored. Will be treated as success if the connect its self succeeds. Example: none:connect:127.0.0.1:6767 lock-id (string) What ID we should say we are BUGS For any feature requests or bug reports please visit: * Github You may also catch up to the author 'daemon' on IRC: * irc.freenode.net * #perl AUTHOR Paul G Webster COPYRIGHT AND LICENSE This software is copyright (c) 2019 by Paul G Webster. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.