Check local address in healthcheck script to ensure correct MinIO port (#7787)

Fixes #7780

dockerscripts/healthcheck.go

@@ -39,6 +39,7 @@ const (
 	healthPath    = "/minio/health/live"
 	timeout       = time.Duration(30 * time.Second)
 	tcp           = "tcp"
+	anyIP		  = ":::"
 )
 
 // returns container boot time by finding
@@ -69,17 +70,15 @@ func findEndpoint() (string, error) {
 	scanner := bufio.NewScanner(stdout)
 	scanner.Split(bufio.ScanLines)
 	// MinIO works on TCP and it is supposed to be
-	// the only process listening on a port inside
-	// container. So we take the first row of netstat
-	// output (that has tcp) and assume that is the
-	// MinIO server port.
+	// the only process listening on a port on any IP address 
+	// (on :::) inside container.
 	// Since MinIO is running as non-root user, we can
-	// no longer depend on the PID/Program name column
+	// not depend on the PID/Program name column
 	// of netstat output
 	for scanner.Scan() {
-		if strings.Contains(scanner.Text(), tcp) {
 		line := scanner.Text()
-			newLine := strings.Replace(line, ":::", "127.0.0.1:", 1)
+		if strings.Contains(line, tcp) && strings.Contains(line, anyIP) {
+			newLine := strings.Replace(line, anyIP, "127.0.0.1:", 1)
 			fields := strings.Fields(newLine)
 			// index 3 in the row has the Local address
 			// find the last index of ":" - address will