Adds Docker checks support to client API.

Also changed `DockerContainerId` to `DockerContainerID`, and updated the agent
API docs to reflect their support for Docker checks.

api/agent.go

@@ -63,13 +63,15 @@ type AgentCheckRegistration struct {
 // AgentServiceCheck is used to create an associated
 // check for a service
 type AgentServiceCheck struct {
-	Script   string `json:",omitempty"`
-	Interval string `json:",omitempty"`
-	Timeout  string `json:",omitempty"`
-	TTL      string `json:",omitempty"`
-	HTTP     string `json:",omitempty"`
-	TCP      string `json:",omitempty"`
-	Status   string `json:",omitempty"`
+	Script            string `json:",omitempty"`
+	DockerContainerID string `json:",omitempty"`
+	Shell             string `json:",omitempty"` // Only supported for Docker.
+	Interval          string `json:",omitempty"`
+	Timeout           string `json:",omitempty"`
+	TTL               string `json:",omitempty"`
+	HTTP              string `json:",omitempty"`
+	TCP               string `json:",omitempty"`
+	Status            string `json:",omitempty"`
 }
 type AgentServiceChecks []*AgentServiceCheck
 

api/agent_test.go

@@ -387,6 +387,50 @@ func TestAgent_Checks_serviceBound(t *testing.T) {
 	}
 }
 
+func TestAgent_Checks_Docker(t *testing.T) {
+	t.Parallel()
+	c, s := makeClient(t)
+	defer s.Stop()
+
+	agent := c.Agent()
+
+	// First register a service
+	serviceReg := &AgentServiceRegistration{
+		Name: "redis",
+	}
+	if err := agent.ServiceRegister(serviceReg); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Register a check bound to the service
+	reg := &AgentCheckRegistration{
+		Name:      "redischeck",
+		ServiceID: "redis",
+		AgentServiceCheck: AgentServiceCheck{
+			DockerContainerID: "f972c95ebf0e",
+			Script:            "/bin/true",
+			Shell:             "/bin/bash",
+			Interval:          "10s",
+		},
+	}
+	if err := agent.CheckRegister(reg); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	checks, err := agent.Checks()
+	if err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	check, ok := checks["redischeck"]
+	if !ok {
+		t.Fatalf("missing check: %v", checks)
+	}
+	if check.ServiceID != "redis" {
+		t.Fatalf("missing service association for check: %v", check)
+	}
+}
+
 func TestAgent_Join(t *testing.T) {
 	t.Parallel()
 	c, s := makeClient(t)

command/agent/agent.go

@@ -919,7 +919,7 @@ func (a *Agent) AddCheck(check *structs.HealthCheck, chkType *CheckType, persist
 			dockerCheck := &CheckDocker{
 				Notify:            &a.state,
 				CheckID:           check.CheckID,
-				DockerContainerId: chkType.DockerContainerId,
+				DockerContainerID: chkType.DockerContainerID,
 				Shell:             chkType.Shell,
 				Script:            chkType.Script,
 				Interval:          chkType.Interval,

command/agent/check.go

@@ -44,7 +44,7 @@ type CheckType struct {
 	HTTP              string
 	TCP               string
 	Interval          time.Duration
-	DockerContainerId string
+	DockerContainerID string
 	Shell             string
 
 	Timeout time.Duration
@@ -68,7 +68,7 @@ func (c *CheckType) IsTTL() bool {
 
 // IsMonitor checks if this is a Monitor type
 func (c *CheckType) IsMonitor() bool {
-	return c.Script != "" && c.DockerContainerId == "" && c.Interval != 0
+	return c.Script != "" && c.DockerContainerID == "" && c.Interval != 0
 }
 
 // IsHTTP checks if this is a HTTP type
@@ -82,7 +82,7 @@ func (c *CheckType) IsTCP() bool {
 }
 
 func (c *CheckType) IsDocker() bool {
-	return c.DockerContainerId != "" && c.Script != "" && c.Interval != 0
+	return c.DockerContainerID != "" && c.Script != "" && c.Interval != 0
 }
 
 // CheckNotifier interface is used by the CheckMonitor
@@ -518,7 +518,7 @@ type CheckDocker struct {
 	Notify            CheckNotifier
 	CheckID           string
 	Script            string
-	DockerContainerId string
+	DockerContainerID string
 	Shell             string
 	Interval          time.Duration
 	Logger            *log.Logger
@@ -574,7 +574,7 @@ func (c *CheckDocker) Stop() {
 func (c *CheckDocker) run() {
 	// Get the randomized initial pause time
 	initialPauseTime := randomStagger(c.Interval)
-	c.Logger.Printf("[DEBUG] agent: pausing %v before first invocation of %s -c %s in container %s", initialPauseTime, c.Shell, c.Script, c.DockerContainerId)
+	c.Logger.Printf("[DEBUG] agent: pausing %v before first invocation of %s -c %s in container %s", initialPauseTime, c.Shell, c.Script, c.DockerContainerID)
 	next := time.After(initialPauseTime)
 	for {
 		select {
@@ -595,7 +595,7 @@ func (c *CheckDocker) check() {
 		AttachStderr: true,
 		Tty:          false,
 		Cmd:          c.cmd,
-		Container:    c.DockerContainerId,
+		Container:    c.DockerContainerID,
 	}
 	var (
 		exec *docker.Exec

command/agent/check_test.go

@@ -535,7 +535,7 @@ func expectDockerCheckStatus(t *testing.T, dockerClient DockerClient, status str
 		Notify:            mock,
 		CheckID:           "foo",
 		Script:            "/health.sh",
-		DockerContainerId: "54432bad1fc7",
+		DockerContainerID: "54432bad1fc7",
 		Shell:             "/bin/sh",
 		Interval:          10 * time.Millisecond,
 		Logger:            log.New(os.Stderr, "", log.LstdFlags),
@@ -595,7 +595,7 @@ func TestDockerCheckDefaultToSh(t *testing.T) {
 		Notify:            mock,
 		CheckID:           "foo",
 		Script:            "/health.sh",
-		DockerContainerId: "54432bad1fc7",
+		DockerContainerID: "54432bad1fc7",
 		Interval:          10 * time.Millisecond,
 		Logger:            log.New(os.Stderr, "", log.LstdFlags),
 		dockerClient:      &fakeDockerClientWithNoErrors{},
@@ -620,7 +620,7 @@ func TestDockerCheckUseShellFromEnv(t *testing.T) {
 		Notify:            mock,
 		CheckID:           "foo",
 		Script:            "/health.sh",
-		DockerContainerId: "54432bad1fc7",
+		DockerContainerID: "54432bad1fc7",
 		Interval:          10 * time.Millisecond,
 		Logger:            log.New(os.Stderr, "", log.LstdFlags),
 		dockerClient:      &fakeDockerClientWithNoErrors{},
@@ -645,7 +645,7 @@ func TestDockerCheckTruncateOutput(t *testing.T) {
 		Notify:            mock,
 		CheckID:           "foo",
 		Script:            "/health.sh",
-		DockerContainerId: "54432bad1fc7",
+		DockerContainerID: "54432bad1fc7",
 		Shell:             "/bin/sh",
 		Interval:          10 * time.Millisecond,
 		Logger:            log.New(os.Stderr, "", log.LstdFlags),

command/agent/config.go

@@ -782,7 +782,7 @@ func FixupCheckType(raw interface{}) error {
 			rawMap["serviceid"] = v
 			delete(rawMap, "service_id")
 		case "docker_container_id":
-			rawMap["DockerContainerId"] = v
+			rawMap["DockerContainerID"] = v
 			delete(rawMap, "docker_container_id")
 		}
 	}

command/agent/config_test.go

@@ -1133,7 +1133,7 @@ func TestDecodeConfig_Check(t *testing.T) {
 		t.Fatalf("bad: %v", chk)
 	}
 
-	if chk.DockerContainerId != "redis" {
+	if chk.DockerContainerID != "redis" {
 		t.Fatalf("bad: %v", chk)
 	}
 }

website/source/docs/agent/http/agent.html.markdown

@@ -241,6 +241,8 @@ body must look like:
   "Name": "Memory utilization",
   "Notes": "Ensure we don't oversubscribe memory",
   "Script": "/usr/local/bin/check_mem.py",
+  "DockerContainerID": "f972c95ebf0e",
+  "Shell": "/bin/bash",
   "HTTP": "http://example.com",
   "TCP": "example.com:22",
   "Interval": "10s",
@@ -259,6 +261,10 @@ The `Notes` field is not used internally by Consul and is meant to be human-read
 If a `Script` is provided, the check type is a script, and Consul will
 evaluate the script every `Interval` to update the status.
 
+If a `DockerContainerID` is provided, the check is a Docker check, and Consul will
+evaluate the script every `Interval` in the given container using the specified
+`Shell`. Note that `Shell` is currently only supported for Docker checks.
+
 An `HTTP` check will perform an HTTP GET request against the value of `HTTP` (expected to
 be a URL) every `Interval`. If the response is any `2xx` code, the check is `passing`.
 If the response is `429 Too Many Requests`, the check is `warning`. Otherwise, the check