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We don't (and won't ever) do log rotation within the process.
That's the job of logrotate and tools like that. We just
reopen logs like other reasonable daemons out there.
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By reraising SignalException in workers. Since we just rely on
default signal handlers for the majority of signals now, ensure
those signals actually exit the process.
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Instead of just worker.nr. This is a configuration file/API
change and will break existing configurations.
This allows worker.tempfile to be exposed to the hooks
so ownership changes can still happen on it.
On the other hand, I don't know of many people actually
using this feature (or Unicorn).
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We need to ensure children are spawned by waiting
until the master is ready.
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Sockets may be unintentionally unlinked on the filesystem.
When reloading our config, ensure that the socket exists
on the filesystem. If not, close the listener (since it's
unusable by outside apps) and reopen it.
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Rather than blindly appending to our listener set
with every "listen" directive read in the config
file, reset our internal array.
Listeners specified on the command-line are always
preserved between config reloads.
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We'll allow before_exec to override that setting, however.
There are cases where someone setting
Logger.new("/path/to/file") will create new file descriptors in
the master process. This will prevent FD leakage
and a test case (for Linux only) proves it.
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They were non-conformant for the longest time
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We need to ensure the QUIT signal to the old processes
are processed when fixing the config.
Additionally, the log rotation checker was not reliable
because the master log emitted a similar message to
the workers and we were not distinguishing between
them. Check for all 5 logs (1 master + 4 workers)
to be rotated.
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We still need to support "listeners" for easy use of
command-line options, but folks using the config file should use
"listen" as it is more flexible.
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Instead of having global options for all listeners,
make all socket options per-listener. This allows
reverse-proxies to pick different listeners to get
different options on different sockets.
Given a cluster of machines (10.0.0.1, 10.0.0.2, 10.0.0.3)
running Unicorn with the following config:
------------------ 8< ----------------
listen "/tmp/local.sock", :backlog => 1
listen "*:8080" # use the backlog=1024 default
------------------ 8< ----------------
It is possible to configure a reverse proxy to try to use
"/tmp/local.sock" first and then fall back to using the
TCP listener on port 8080 in a failover configuration.
Thus the nginx upstream configuration on 10.0.0.1 to
compliment this would be:
------------------ 8< ----------------
upstream unicorn_cluster {
# reject connections ASAP if we are overloaded
server unix:/tmp/local.sock;
# fall back to other machines in the cluster via "backup"
# listeners which have a large backlog queue.
server 10.0.0.2:8080 backup;
server 10.0.0.3:8080 backup;
}
------------------ 8< ----------------
This removes the global "backlog" config option which
was inflexible with multiple machines in a cluster
and exposes the ability to change SO_SNDBUF/SO_RCVBUF
via setsockopt(2) for the first time.
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They're easier for me to type and read and just barely faster
when doing comparisons on.
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Instead of rotating logs immediately when SIGUSR1 is caught,
defer it until the current client is processing is complete.
This allows multi-line log messages generated by apps to not be
broken up if SIGUSR1 is received while the app is running.
If we're sleeping inside IO.select, we close a pipe in the
exceptfds set to cause EBADF to be raised.
This also adds a small reliability improvement to test_exec
so we wait until signals are ready before sending USR1
to rotate logs.
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The master _may_ run with different user/group/umask than the
workers. Since the logs were always created by the master
process, the master should rotate them first to ensure correct
ownership and permissions.
This way if the workers fail log rotation and die, they'll
be automatically respawned with the new logs in place.
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Although I didn't like the idea initially, signal queueing
allows test_exec to run more reliably and the limited signal
queue size will prevent scary queued signal behavior.
Also, always wakeup the master immediately when CHLD is trapped
to reduce the performance impact of SIGHUP-based config
reloading. Combined with an extra check in test_exec, this
should make test_exec run much more reliably than before.
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Hopefully this increases test reliability
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This reverts commit 4414d9bf34f162a604d2aacc765ab1ca2fc90404.
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This reverts commit e66ab79b8b5bc5311c750bf03868a7b2574f4ea1.
Conflicts:
bin/unicorn
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There used to be a log rotation lambda in there, but
that got moved to lib/unicorn/util.rb for convenience.
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I consider it a sensible default for long-running servers.
Additionally, there is no easy way to make USR1 rotate the
master process log without this.
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Since I use it myself and also in the tests, we
might as well implement it correctly as a class method
so people can run it in their trap('USR2') hooks.
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Probably not a real bug, but test_exec has been experiencing
mysterious failures....
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Oops, that was making debugging tests quite difficult.
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It's confusing with the lowercase "-p" option which is more
common for developers to use. PID files are only needed for
production deployments, and those should be using config files
anyways.
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Yeah, some of my test machines are ridiculously slow...
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23x79 looks better in a terminal, but the Ruby 1.9
OptionParser output adds a little more whitespace
requiring 24x80 output, which is still fine...
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Hopefully this fixes some random test failures I've
been experiencing...
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Ensure the output fits in a standard ANSI terminal so it's easy
to read for all users regardless of what interface they're
working from.
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Since not all rackup command-line options can be supported by
Unicorn, disable this gross hack to avoid potentially
unpredictable or undefined behavior. config.ru will not be able
to specify the config file for unicorn-specific options; but the
unicorn-specific config files themselves will be allowed to
override the default config.ru location.
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People can screw config files up, it's not my fault
if they do, but they do... Don't let the original
process get wedged if we can help it..
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Apparently the at_exit handlers were not triggering for an
execed process.
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This adds a bunch of execution tests that require the "unicorn"
binary to be in PATH as well as rack being directly
"require"-able ("rubygems" will not be loaded for you). The
tester is responsible for setting up PATH and RUBYLIB
appropriately.
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