Well picked up Cody. Same issues here. Basically the "f.gets" on an
opened /proc file just hangs inside god. Seems to work fine outside of
god, e.g.
ruby -e 'File.open("/proc/meminfo"){|f| puts f.gets}'
But if you debug the initialize() in SlashProcCaller, you can see that
it gets *inside* the File.open(MeminfoPath), but hangs as soon as it
tries to f.gets. Checking cpu usage while it's "hung" and it's taking
up pretty much all the cpu.
No idea how to fix this other than not use File.open() as you have
suggested in your pastie.
I thought it might be something to do with the line separator ($/), so
I tried File.read() and tried seeing what $/ was, but all to no avail.
No idea why File.open.gets() on /proc files works outside god but not
inside.
regards,
Danial
On Nov 7, 4:18 pm, gonzoprosperity <[EMAIL PROTECTED]> wrote:
> We too experienced issues with God on CentOS. In our case, God was
> using excessive amounts of CPU and we traced it down to issues in the
> poller. We have this basic patch for God 0.7.8 that fixed all our
> problems.
>
> http://pastie.org/309318
>
> You can execute this patch from the top-level of the God gem
> directory.
>
> It doesnt seem like it would make much sense, but converting the Ruby
> File open calls to Unix process forks with backticks and just using
> the plain old 'head' and 'cat' utilities did the trick.
>
> YMMV. Good luck.
>
> /Cody
>
> On Nov 6, 6:38 pm, Tigris <[EMAIL PROTECTED]> wrote:
>
> > Thanks Colin.
>
> > Messing with your monkey patch a bit, it seems the modification to
> > spawn() isn't required for me to get god to work on CENTOS. Just
> > patching the fetch_system_profiler() fixes it.
>
> > I managed to simplify it down to this so far:
>
> > module God
> > module System
> > class SlashProcPoller
> > def self.usable?
> > false
> > end
> > end
> > end
> > end
>
> > So it's obviously a bug in that poller, i'll start debugging and see
> > if I can't dig up a patch for the god repo.
>
> > regards,
> > Danial
>
> > On Nov 7, 1:21 am, "Colin Steele" <[EMAIL PROTECTED]> wrote:
>
> > > module God
> > > module System
> > > class Process
> > > alias_method :orig_fetch_system_poller, :fetch_system_poller
> > > def fetch_system_poller
> > > if `hostname` =~ /YOUR CENTOS HOST(S) HERE/
> > > PortablePoller
> > > else
> > > orig_fetch_system_poller
> > > end
> > > end
> > > end
> > > end
> > > class Process
> > > def spawn(command)
> > > fork do
> > > uid_num = Etc.getpwnam(self.uid).uid if self.uid
> > > gid_num = Etc.getgrnam(self.gid).gid if self.gid
>
> > > ::Process.groups = [gid_num] if self.gid
> > > ::Process::Sys.setgid(gid_num) if self.gid
> > > ::Process::Sys.setuid(uid_num) if self.uid
>
> > > $0 = command
> > > STDIN.reopen "/dev/null"
> > > STDOUT.reopen file_in_chroot(self.log), "a"
> > > STDERR.reopen STDOUT
>
> > > # close any other file descriptors
> > > 3.upto(256){|fd| IO::new(fd).close rescue nil}
>
> > > if self.env && self.env.is_a?(Hash)
> > > self.env.each do |(key, value)|
> > > ENV[key] = value
> > > end
> > > end
>
> > > exec command unless command.empty?
> > > end
> > > end
> > > end
> > > end
>
> > > On Thu, Nov 6, 2008 at 2:01 AM, Tigris <[EMAIL PROTECTED]> wrote:
>
> > > > On Sep 14, 1:06 pm, None <[EMAIL PROTECTED]> wrote:
> > > >> I've found and fixed my problem(s). Turns out the let-god-demonize
> > > >> thing was a red herring. The fixes were to use the PortablePoller on
> > > >> CENTOS, and to modify God::System::Process#spawn not to perform chroot
> > > >> and chdir. Voila!
>
> > > > I don't suppose anyone can explain a bit better on how to achieve
> > > > this? I'm experiencing the same problems outlined here on CENTOS also.
> > > > Kill the processes manually after loading god and it doesn't even see
> > > > the fact they died, nor do I see it polling in the logs, it just sits
> > > > there apparently doing nothing.
>
> > > > #######################
> > > > def make_fail_safe(watcher)
> > > > watcher.lifecycle do |on|
> > > > on.condition(:flapping) do |c|
> > > > c.to_state = [:start, :restart]
> > > > c.times = 5
> > > > c.within = 5.minutes
> > > > c.transition = :unmonitored
> > > > c.retry_in = 10.minutes
> > > > c.retry_times = 5
> > > > c.retry_within = 2.hours
> > > > end
> > > > end
> > > > end
>
> > > > God.watch do |w|
> > > > w.name = 'apache'
> > > > w.pid_file = '/var/run/httpd.pid'
> > > > w.interval = 60.seconds
>
> > > > w.start = '/etc/init.d/httpd start'
> > > > w.stop = '/etc/init.d/httpd stop'
> > > > w.restart = '/etc/init.d/httpd graceful'
>
> > > > w.start_grace = 20.seconds
> > > > w.restart_grace = 20.seconds
>
> > > > w.behavior(:clean_pid_file)
>
> > > > w.restart_if do |r|
> > > > r.condition(:cpu_usage) {|c| c.notify = 'developers'; c.above =
> > > > 80.percent; c.times = 5}
> > > > r.condition(:cpu_usage) {|c| c.notify = 'developers'; c.above =
> > > > 60.percent; c.times = 2}
> > > > r.condition(:memory_usage){|c| c.notify = 'developers'; c.above =
> > > > 500.megabytes; c.times = 5}
> > > > r.condition(:http_response_code) do |c|
> > > > c.notify = 'developers'
> > > > c.host = 'www.example.com'
> > > > c.path = '/god'
> > > > c.code_is_not = 200
> > > > c.timeout = 2.seconds
> > > > end
> > > > end
>
> > > > make_fail_safe(w)
> > > > end
>
> > > > God.contact(:email) do |c|
> > > > c.name = 'Me'
> > > > c.email = '[EMAIL PROTECTED]'
> > > > c.group = 'developers'
> > > > end
> > > > #######################
>
> > > > regards,
> > > > Danial
>
> > > --
> > > Colin Steelewww.colinsteele.org
> > > [EMAIL PROTECTED]
> > > Ken Kesey - "Ritual is necessary for us to know anything."
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