Add cgroup info and links to the process list on root page.

info/v2/container.go

@@ -181,5 +181,6 @@ type ProcessInfo struct {
 	VirtualSize   uint64  `json:"virtual_size"`
 	Status        string  `json:"status"`
 	RunningTime   string  `json:"running_time"`
+	CgroupPath    string  `json:"cgroup_path"`
 	Cmd           string  `json:"cmd"`
 }

manager/container.go

@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"math"
 	"os/exec"
+	"regexp"
 	"sort"
 	"strconv"
 	"strings"
@@ -41,6 +42,8 @@ var HousekeepingInterval = flag.Duration("housekeeping_interval", 1*time.Second,
 var maxHousekeepingInterval = flag.Duration("max_housekeeping_interval", 60*time.Second, "Largest interval to allow between container housekeepings")
 var allowDynamicHousekeeping = flag.Bool("allow_dynamic_housekeeping", true, "Whether to allow the housekeeping interval to be dynamic")
 
+var cgroupPathRegExp = regexp.MustCompile(".*:devices:(.*?),.*")
+
 // Decay value used for load average smoothing. Interval length of 10 seconds is used.
 var loadDecay = math.Exp(float64(-1 * (*HousekeepingInterval).Seconds() / 10))
 
@@ -116,6 +119,19 @@ func (c *containerData) DerivedStats() (v2.DerivedStats, error) {
 	return c.summaryReader.DerivedStats()
 }
 
+func (c *containerData) getCgroupPath(cgroups string) (string, error) {
+	if cgroups == "-" {
+		return "/", nil
+	}
+	matches := cgroupPathRegExp.FindSubmatch([]byte(cgroups))
+	if len(matches) != 2 {
+		glog.V(3).Infof("failed to get devices cgroup path from %q", cgroups)
+		// return root in case of failures - devices hierarchy might not be enabled.
+		return "/", nil
+	}
+	return string(matches[1]), nil
+}
+
 func (c *containerData) GetProcessList() ([]v2.ProcessInfo, error) {
 	// report all processes for root.
 	isRoot := c.info.Name == "/"
@@ -130,9 +146,9 @@ func (c *containerData) GetProcessList() ([]v2.ProcessInfo, error) {
 		}
 	}
 	// TODO(rjnagal): Take format as an option?
-	format := "user,pid,ppid,stime,pcpu,pmem,rss,vsz,stat,time,comm"
+	format := "user,pid,ppid,stime,pcpu,pmem,rss,vsz,stat,time,comm,cgroup"
 	args := []string{"-e", "-o", format}
-	expectedFields := 11
+	expectedFields := 12
 	out, err := exec.Command("ps", args...).Output()
 	if err != nil {
 		return nil, fmt.Errorf("failed to execute ps command: %v", err)
@@ -171,6 +187,14 @@ func (c *containerData) GetProcessList() ([]v2.ProcessInfo, error) {
 		if err != nil {
 			return nil, fmt.Errorf("invalid virtual size %q: %v", fields[7], err)
 		}
+		var cgroupPath string
+		if isRoot {
+			cgroupPath, err = c.getCgroupPath(fields[11])
+			if err != nil {
+				return nil, fmt.Errorf("could not parse cgroup path from %q: %v", fields[10], err)
+			}
+		}
+
 		if isRoot || pidMap[pid] == true {
 			processes = append(processes, v2.ProcessInfo{
 				User:          fields[0],
@@ -183,7 +207,8 @@ func (c *containerData) GetProcessList() ([]v2.ProcessInfo, error) {
 				VirtualSize:   vs,
 				Status:        fields[8],
 				RunningTime:   fields[9],
-				Cmd:           strings.Join(fields[10:], " "),
+				Cmd:           fields[10],
+				CgroupPath:    cgroupPath,
 			})
 		}
 	}

pages/containers_html.go

@@ -215,7 +215,7 @@ const containersHtmlTemplate = `
       {{end}}
     </div>
     <script type="text/javascript">
-      startPage({{.ContainerName}}, {{.CpuAvailable}}, {{.MemoryAvailable}}, {{.Root}});
+      startPage({{.ContainerName}}, {{.CpuAvailable}}, {{.MemoryAvailable}}, {{.Root}}, {{.IsRoot}});
       drawImages({{.DockerImages}});
     </script>
   </body>

pages/static/containers_js.go

@@ -462,12 +462,16 @@ function drawImages(images) {
 	drawTable(titles, titleTypes, data, "docker-images", 30);
 }
 
-function drawProcesses(processInfo) {
+function drawProcesses(isRoot, rootDir, processInfo) {
 	if (processInfo.length == 0) {
 		return;
 	}
 	var titles = ["User", "PID", "PPID", "Start Time", "CPU %", "MEM %", "RSS", "Virtual Size", "Status", "Running Time", "Command"];
 	var titleTypes = ['string', 'number', 'number', 'string', 'number', 'number', 'number', 'number', 'string', 'string', 'string'];
+	if (isRoot) {
+		titles.push("Cgroup");
+		titleTypes.push('string');
+	}
 	var data = []
 	for (var i = 0; i < processInfo.length; i++) {
 		var elements = [];
@@ -482,6 +486,12 @@ function drawProcesses(processInfo) {
 		elements.push(processInfo[i].status);
 		elements.push(processInfo[i].running_time);
 		elements.push(processInfo[i].cmd);
+		if (isRoot) {
+			var cgroup = processInfo[i].cgroup_path
+			// Use the raw cgroup link as it works for all containers.
+			var cgroupLink = '<a href="' + rootDir + 'containers/' + cgroup +'">' + cgroup.substr(0,30) + ' </a>';
+			elements.push({v:cgroup, f:cgroupLink});
+		}
 		data.push(elements);
 	}
 	drawTable(titles, titleTypes, data, "processes-top", 25);
@@ -600,7 +610,7 @@ function drawCharts(machineInfo, containerInfo) {
 }
 
 // Executed when the page finishes loading.
-function startPage(containerName, hasCpu, hasMemory, rootDir) {
+function startPage(containerName, hasCpu, hasMemory, rootDir, isRoot) {
 	// Don't fetch data if we don't have any resource.
 	if (!hasCpu && !hasMemory) {
 		return;
@@ -612,11 +622,11 @@ function startPage(containerName, hasCpu, hasMemory, rootDir) {
 
 	// Draw process information at start and refresh every 60s.
 	getProcessInfo(rootDir, containerName, function(processInfo) {
-		drawProcesses(processInfo)
+		drawProcesses(isRoot, rootDir, processInfo)
 	});
 	setInterval(function() {
 		getProcessInfo(rootDir, containerName, function(processInfo) {
-			drawProcesses(processInfo)
+			drawProcesses(isRoot, rootDir, processInfo)
 		});
 	}, 60000);