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Add init process for zombie fighting

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This adds a small C binary for fighting zombies.  It is mounted under
`/dev/init` and is prepended to the args specified by the user.  You
enable it via a daemon flag, `dockerd --init`, as it is disable by
default for backwards compat.

You can also override the daemon option or specify this on a per
container basis with `docker run --init=true|false`.

You can test this by running a process like this as the pid 1 in a
container and see the extra zombie that appears in the container as it
is running.

```c

int main(int argc, char ** argv) {
	pid_t pid = fork();
	if (pid == 0) {
		pid = fork();
		if (pid == 0) {
			exit(0);
		}
		sleep(3);
		exit(0);
	}
	printf("got pid %d and exited\n", pid);
	sleep(20);
}
```

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Michael Crosby
2016-06-27 14:38:47 -07:00
parent d8c9951707
commit ee3ac3aa66
22 changed files with 112 additions and 68 deletions
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6
integration-cli/docker_cli_run_unix_test.go
View File

@@ -1234,11 +1234,11 @@ func (s *DockerSuite) TestRunPidsLimit(c *check.C) {
testRequires(c, pidsLimit)
file := "/sys/fs/cgroup/pids/pids.max"
out, _ := dockerCmd(c, "run", "--name", "skittles", "--pids-limit", "2", "busybox", "cat", file)
c.Assert(strings.TrimSpace(out), checker.Equals, "2")
out, _ := dockerCmd(c, "run", "--name", "skittles", "--pids-limit", "4", "busybox", "cat", file)
c.Assert(strings.TrimSpace(out), checker.Equals, "4")
out = inspectField(c, "skittles", "HostConfig.PidsLimit")
c.Assert(out, checker.Equals, "2", check.Commentf("setting the pids limit failed"))
c.Assert(out, checker.Equals, "4", check.Commentf("setting the pids limit failed"))
}
func (s *DockerSuite) TestRunPrivilegedAllowedDevices(c *check.C) {