Update nodejs_web_app.md

The image centos:centos6.4 doesn't exist. Instead you have to choose between the official centos6 or centos7. Both images does not work together with de yum npm install. When choosing an centos6.5 from another distributor (tutum) it works.
integcli: add some more docker utils

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
integcli: use dockerCmdInDir in build tests

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)
Update nodejs_web_app.md

Updated to documentation to use the centos6 image instead of the unofficial tutum image of centos6.4
Print about "copy volume content" test passing

Docker-DCO-1.1-Signed-off-by: Alexandr Morozov <lk4d4math@gmail.com> (github: LK4D4)
Added "Github Submodules" section to Automated Builds doc.

Signed-off-by: Hollie Teal <hollie.teal@docker.com>
Made requested changes (capitalization)
Add maintainers to daemon/ and graph/

Signed-off-by: Solomon Hykes <solomon@docker.com>
Subsystems can register cleanup handlers with Engine.OnShutdown

Signed-off-by: Solomon Hykes <solomon@docker.com>
Move signal handling code to pkg/signal.Trap

Signed-off-by: Solomon Hykes <solomon@docker.com>
Cleanup: refactor shutdown and signal handling facility

This disentangles the following functions, which were previously all mixed together:

* 1) Waiting for jobs to terminate when shutting down
* 2) Handling signals in the Docker daemon
* 3) Per-subsystem cleanup handlers
* 4) pidfile management

Responsibilities are dispatched as follows:

* Signal traps are set in `main`, and trigger `engine.Shutdown`
* `engine.Shutdown` coordinates cleanup by waiting for jobs to complete, and calling shutdown handlers
* To perform cleanup at shutdown, each subsystem registers handlers with `engine.OnShutdown`
* `daemon` is one subsystem, so it registers cleanup via `engine.OnShutdown`.
* `daemon` owns the pidfile, which is used to lock access to `/var/lib/docker`. Part of its cleanup is to remove the pidfile.

Signed-off-by: Solomon Hykes <solomon@docker.com>
Remove unnecessary job "initserverpidfile"

That job was a hacky solution to a real race condition. This removes the
hack without re-introducing the race.

Signed-off-by: Solomon Hykes <solomon@docker.com>
Replace Server.IsRunning with Engine.IsShutdown

Signed-off-by: Solomon Hykes <solomon@docker.com>
Extra testing for engine.Shutdown

Signed-off-by: Solomon Hykes <solomon@docker.com>
Remove last trace of Daemon->Server dependency

This removes a shim `daemon.Server` interface which was used to start
separating Daemon from Server *gradually*, without getting cyclic
dependency errors.

Now that the last Daemon->Server dependency has been removed, we can
finally remove the shim. Yay!

Signed-off-by: Solomon Hykes <solomon@docker.com>
Remove unused field from engine.Job

Signed-off-by: Solomon Hykes <solomon@docker.com>
Engine.Shutdown only waits 5 seconds for active jobs to complete

Signed-off-by: Solomon Hykes <solomon@docker.com>
Replace "amd64" build tags with "cgo" as appropriate, and remove where unnecessary

Signed-off-by: Andrew Page <admwiggin@gmail.com>
utils/broadcastwriter -> pkg/broadcastwriter

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
utils.Debugf -> log.Printf, move jsonlog to own package.

Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)