Re: Who actually gets the TERM signal in "runsvctrl down"?

[Dean Hall <dean-lists@deanpence.com>]

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Charlie,

Just some notes and questions for my own edification, somewhat unrelated
to the original post.

Charlie Brady wrote:
| The better way is runit/daemontools. runsvctrl is just a shell script
| which tries to do what runsv is already able to do reliably. It
delivers a
| signal to the session leading httpd process, which it has hopefully found
| by way of a pid file. That process then "does the right thing" with its
| children.

I'm not sure what you mean when you say that runsvctrl does what runsv
already does. As I understand it, it's the Right Thing To Do to send
signals to your service process (or in the case of "u", "d" and "x", to
runsv itself).

(Also, runsvctrl doesn't appear to be a shell script, at least not in
runit-1.0.2.)

| For "apachectl stop", just do "runsvctrl down apache". For "apachectl
| graceful", do "runsvctrl 1 apache; raunsvctrl u apache". For "apachectrl
| restart", do "runsvctrl t apache; raunsvctrl u apache". Etc.

Why are you doing the additional "u"? As I understand it, sending a "u"
to the fifo is really necessary if the service is marked as down. If
after sending any signal to the process it dies/crashes, runsv should
restart it automatically. Does runsv not always do this? (I've never had
any trouble.) If not, sounds like a major bug, as that's what it's
supposed to do.

So when I restart apache, I just do:

runsvctrl t /service/httpd

BTW, I recommend running apache2 with pgrphack so it won't kill other
things when you kill it. Apache 1.3 doesn't seem to have this problem. I
know it has something to do with being the session leader (a la sid()),
but I'm not a Linux systems programmer (nor really a C programmer) and
am not sure what all that entails.


Dean
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