Docker安装成功后打开报错自动退出，如何解决？

看moby的源码，restartmanager/restartmanager.go的ShouldRestart函数中有这样的逻辑：根据restart参数的设置值确定在各种情况下是否应该重启，并返回判断结果：

var restart bool
switch {
case rm.policy.IsAlways():
	restart = true
case rm.policy.IsUnlessStopped() && !hasBeenManuallyStopped:
	restart = true
case rm.policy.IsOnFailure():
	// the default value of 0 for MaximumRetryCount means that we will not enforce a maximum count
	if max := rm.policy.MaximumRetryCount; max == 0 || rm.restartCount < max {
		restart = exitCode != 0
	}
}

而在daemon/monitor.go的ProcessEvent函数中使用了ShouldRestart的逻辑。docker的daemon进程会监听各个容器生命周期中各种事件，而对应的行为是通过调用ProcessEvent来处理的，只要有事件触发，那么libcontainerd就会调用ProcessEvent函数生成行为。当判断事件是容器退出事件时，就会根据传入的restart police来处理这个事件：

case libcontainerdtypes.EventExit:
    if int(ei.Pid) == c.Pid {
        // ... 此处省略15行
        restart, wait, err := c.RestartManager().ShouldRestart(ei.ExitCode, daemon.IsShuttingDown() || c.HasBeenManuallyStopped, time.Since(c.StartedAt))
		if err == nil && restart {
			c.RestartCount++
			c.SetRestarting(&exitStatus)
		} else {
			if ei.Error != nil {
				c.SetError(ei.Error)
			}
			c.SetStopped(&exitStatus)
			defer daemon.autoRemove(c)
		}

而具体moby定义了哪些事件呢？在libcontainerd/types/types.go中定义了如下事件：

// Event constants used when reporting events
const (
	EventUnknown     EventType = "unknown"
	EventExit        EventType = "exit"
	EventOOM         EventType = "oom"
	EventCreate      EventType = "create"
	EventStart       EventType = "start"
	EventExecAdded   EventType = "exec-added"
	EventExecStarted EventType = "exec-started"
	EventPaused      EventType = "paused"
	EventResumed     EventType = "resumed"
)

每一个事件信息量都是一个复合变量struct，包含了容器ID、容器进程ID、Pid、退出代码、退出时间、是否OOM掉了，以及详细的err对象。这里包含的信息足够使docker engine对涉事容器进行操作了。

// EventInfo contains the event info
type EventInfo struct {
	ContainerID string
	ProcessID   string
	Pid         uint32
	ExitCode    uint32
	ExitedAt    time.Time
	OOMKilled   bool
	Error       error
}