On 12/20/05, Kalin KOZHUHAROV <[EMAIL PROTECTED]> wrote: > Eric Brown wrote: > > It's not just init scripts that are designed poorly, it's applications > > that fail to daemonize and dont' return non-zero. (like apache-1.3, > > ntp-date, snort, etc.. most servers). > Yeah, that is the real problem, but that is not fixable immediately. > > > I think the new baselayout has some adjustable sleep/checks on by > > default, but I haven't tries it yet. I suppose that would work by > > having the init script sleep for a short time, then check to see if a > > certain process is running (a dirty hack that's frowned updon by > > some)... > > > > Anyway, I really think this is something worth looking into, either as > > a separate package that implements some kind of monitoring functions > > in init scripts, or as a basic set of monitoring functions that are > > included in baselayout for developers to optionally use. > > > While there are options like daemontools and rmon? I don't think they > > provide a very robust solution to this problem. > Can you elaborate on this? What is wrong with daemontools? > > http://cr.yp.to/daemontools/faq/create.html#why > > > Here's an idea: > > > > Have users emerge a program that can do some basic things: > emerge daemontools > > > > 1) check config scripts of running services for variables like: > > CHECK_COMMAND > svstat /service/daemon > > > SLEEP_TIME > If I get you right, this is hard coded to 1 second for supervise. > > > INIT_SLEEP > If I get you right, this is hard coded to 1 second for supervise. > > > IF_DOWN_DO_THIS > Not sure how important is this, but flexibility can be achieved inside the > ./run script of the > daemon. The normal thing is to start it again. > svc -u /service/daemon > > > (those variables could optionally be implemented per package, or > > explicitly disabled, they would have sane defaults in a central .conf > > file for this enhancement package) > This can be worked on, the start is sys-process/daemontools-scripts. > > > 2) is a cron job/daemon that automatically checks all running apps in > > the current runlevel, can report problems (send emails, log stuff, > > etc), can send heartbeat, etc.. > Can you trust cron, started from a init script? > Instead a script started under supervise, as simple as this: > #!/bin/bash > > sleep 60; > `svstat /service/* |grep down >/dev/null` && \ > echo "Something is wrong" | your_favourite_mailer_here > > (The above is not tested, just thought of. Feel free to improve). > (Like there can be intentionally down-ed services -e /service/daemon/down) > > > 3) is well documented in the gentoo handbook since it's probably a > > vital component > http://cr.yp.to/daemontools.html is a good start, in can be improved for sure. > > > To me this kind of thing is probably simple, unixish, and robust > > enough for most of our needs... > > > > Any thoughs? > Don't top-post :-) > > Kalin. > /known also as Korokoro or tar/ > > P.S. Whose MTA changes the subject with [OBORONA-SPAM] ? Please remove that; > use a custom header > instead. > > -- > |[ ~~~~~~~~~~~~~~~~~~~~~~ ]| > +-> http://ThinRope.net/ <-+ > |[ ______________________ ]| > > -- > [email protected] mailing list > >
What I don't like about daemontools is that I like our current init system, and daemontools just totally replaces it. With a little effort, it might be possible to simply supplement the init script resources we already have. I would really miss some of the stuff the gentoo devs made easy for us: automatic dependency handling, ease of use w/rc-update, simple configuration symatics for a wide range of daemons (network stuff and drive mounting stuff)... Anyway, I'm glad you brought up daemontools, there's a lot to learn from it. Maybe approaching this problem from the other direction would even be a good idea: How can we enhance daemontools to create a new gentoo init script system that's every bit as friendly as the current one? -- [email protected] mailing list
