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Update TODO: more on inetd and at support.

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Also a minor fix to the README.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
This commit is contained in:
Joachim Nilsson
2015-01-06 20:54:52 +01:00
parent 8f1c16a8a5
commit 076f77a31b
2 changed files with 49 additions and 27 deletions
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README.md
+1 -1
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@@ -94,7 +94,7 @@ finit reads its configuration from `/etc/finit.conf`. Syntax:
optional arguments and description. This command is guaranteed to
be completed before running the next command.
* `task LVLS] /path/to/cmd ARGS -- Optional description`
* `task [LVLS] /path/to/cmd ARGS -- Optional description`
One-shot like 'run', but starts in parallel with the next command
TODO.md
+48 -26
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@@ -1,17 +1,31 @@
TODO
====
Unsorted TODO list of features and points of investigation that could be
useful for improving finit. But what is an improvement to finit? Well,
similiar to launchd, the goal of finit is to be a FAST replacement for:
The intent of finit is to monitor not just processes, but to supervise
an entire system and the behavior of certain processes that declare
themselves to be finit compliant. Similiar to launchd, the goal of
finit is to be a replacement for:
* init
* inetd
* crond
* watchdogd
The main goal is to be FAST. Secondary goals are to be: small, simple
and with a very low dependency on external packages.
A small and simple replacement, primarily for embedded systems, with a
very low dependency on external packages.
* Integrate libev, or libuEv, to handle events: signals, I/O, etc.
"Event driven software improves concurrency" -- Dave Zarzycki, Apple
See the [launchd video](http://www.youtube.com/watch?v=cD_s6Fjdri8)
for more info!
See uftpd for how libuEv can be easily integrated as a submodule.
* Add support for a `/dev/watchdog` plugin to replace `watchdogd`
* Integrate watchdog plugin with process/system supervisor to optionally
reboot the system when a process stops responding, or when a respawn
limit has been reached, as well as when system load gets too high.
Inetd
@@ -42,6 +56,28 @@ easiest (and what we need for WeOS at Westermo) is allow/deny per iface.
# Allow SSH connections originating from eth0
allow ssh eth0
Another option, to further extend the Inetd capabilities, is a separate
`finetd.conf` to list services. This would be beneficial when running
an SSH service on different ports on different interfaces:
# Run SSH on port 22 on all interfaces except upstream
tcp ssh {
listen = *, !wan0
exec = dropbear -i
}
# Run SSH on non-standard port 222 for upstream interface
tcp 222 {
listen = wan0
exec = dropbear -i
}
# Run TFTP service on all interfaces except upstream interface
udp tftp {
listen = *, !wan0
exec = uftpd -i -t
}
Crond
-----
@@ -60,32 +96,18 @@ Proposed syntax:
# One-shot 'at' command
at @YY-mm-ddTHH:MM [LVLS] /path/to/cmd [ARGS] -- Optional descr
Notice the ISO date similarity in notation. The runlevels is extra
filtering sugar. E.g., if cron service is only allowed in runlevels two
or three it will not start if system currently is in runlevel four.
Notice the ISO date in notation. The runlevels is extra filtering
sugar. E.g., if cron service is only allowed in runlevels two or three
it will not start if system currently is in runlevel four.
To run a command as another user the `.conf` file must have a that
owner. E.g., `/etc/finit.d/extra.conf` may be owned by operator and
only hold `cron ...` lines.
Priority
--------
The intent of finit is to monitor not just processes, but to supervise
an entire system and the behavior of certain processes that declare
themselves to be finit compliant.
* Integrate libev, or libuev, to handle events: signals, I/O, etc.
"Event driven software improves concurrency" -- Dave Zarzycki, Apple
See the [launchd video](http://www.youtube.com/watch?v=cD_s6Fjdri8)
for more info!
* Add support for a `/dev/watchdog` plugin to replace `watchdogd`
* Integrate watchdog plugin with process/system supervisor to optionally
reboot the system when a process stops responding, or when a respawn
limit has been reached, as well as when system load gets too high.
What would be extremely useful is if `initctl`, or a homegrown `at`,
could support the basic functionality of the `at` command directly from
the shell -- that way setting up one-time jobs would not entail
re-reading `/etc/finit.conf`
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