diff --git a/cmd/mockbackend/e2etesting.go b/cmd/mockbackend/e2etesting.go
index 34172cf1f..e342ddcba 100644
--- a/cmd/mockbackend/e2etesting.go
+++ b/cmd/mockbackend/e2etesting.go
@@ -23,14 +23,16 @@ import (
 )
 
 type TestSchema struct {
-	Apps    []App
-	Queries []Query
+	Apps       []App
+	StartDelay time.Duration `yaml:"startDelay"`
+	Queries    []Query
 }
 
 type App struct {
-	Name   string
-	Binary string
-	Args   []string
+	Name     string
+	Binary   string
+	Args     []string
+	AliveURL string `yaml:"aliveURL"`
 }
 
 type Query struct {
@@ -409,8 +411,24 @@ func e2eTest(logger *zap.Logger, noapp, breakOnError, verbose bool) bool {
 		}
 
 		wgStart.Wait()
-		logger.Info("will sleep for 1 seconds to start all required apps")
-		time.Sleep(1 * time.Second)
+		logger.Info("will sleep to start all required apps")
+		if cfg.Test.StartDelay <= 0 {
+			cfg.Test.StartDelay = time.Second
+		}
+		aliveDelay := time.Millisecond * 50
+		for _, c := range cfg.Test.Apps {
+			if c.AliveURL != "" {
+				for i := 0; i < 30; i++ {
+					resp, err := http.Get(c.AliveURL)
+					if err == nil && resp != nil && resp.StatusCode == http.StatusOK {
+						break
+					} else {
+						time.Sleep(aliveDelay)
+					}
+				}
+			}
+		}
+		time.Sleep(cfg.Test.StartDelay)
 	}
 
 	for _, t := range cfg.Test.Queries {
diff --git a/cmd/mockbackend/testcases/find_error/find_error.yaml b/cmd/mockbackend/testcases/find_error/find_error.yaml
index 53b5003f7..b2c8e812e 100644
--- a/cmd/mockbackend/testcases/find_error/find_error.yaml
+++ b/cmd/mockbackend/testcases/find_error/find_error.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/render_error/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
         - endpoint: "http://127.0.0.1:8081"
           type: "GET"
diff --git a/cmd/mockbackend/testcases/i484/i484.yaml b/cmd/mockbackend/testcases/i484/i484.yaml
index 628e7f558..b507ac747 100644
--- a/cmd/mockbackend/testcases/i484/i484.yaml
+++ b/cmd/mockbackend/testcases/i484/i484.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/i484/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i503/i503.yaml b/cmd/mockbackend/testcases/i503/i503.yaml
index 4a794df2a..2db1ab616 100644
--- a/cmd/mockbackend/testcases/i503/i503.yaml
+++ b/cmd/mockbackend/testcases/i503/i503.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i506/i506.yaml b/cmd/mockbackend/testcases/i506/i506.yaml
index 98737d16b..e548c83c1 100644
--- a/cmd/mockbackend/testcases/i506/i506.yaml
+++ b/cmd/mockbackend/testcases/i506/i506.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/i506/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i516/i516.yaml b/cmd/mockbackend/testcases/i516/i516.yaml
index d2f0ff424..2a7fd1f3e 100644
--- a/cmd/mockbackend/testcases/i516/i516.yaml
+++ b/cmd/mockbackend/testcases/i516/i516.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i517/i517.yaml b/cmd/mockbackend/testcases/i517/i517.yaml
index e9158ef3d..13d957b26 100644
--- a/cmd/mockbackend/testcases/i517/i517.yaml
+++ b/cmd/mockbackend/testcases/i517/i517.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i545/i545.yaml b/cmd/mockbackend/testcases/i545/i545.yaml
index bb9329ed7..408c11b80 100644
--- a/cmd/mockbackend/testcases/i545/i545.yaml
+++ b/cmd/mockbackend/testcases/i545/i545.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/i545/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i565/i565.yaml b/cmd/mockbackend/testcases/i565/i565.yaml
index 1fc4762ff..b5bf515df 100644
--- a/cmd/mockbackend/testcases/i565/i565.yaml
+++ b/cmd/mockbackend/testcases/i565/i565.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i580/i580.yaml b/cmd/mockbackend/testcases/i580/i580.yaml
index 29baa4d35..592af6ecc 100644
--- a/cmd/mockbackend/testcases/i580/i580.yaml
+++ b/cmd/mockbackend/testcases/i580/i580.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i584/i584.yaml b/cmd/mockbackend/testcases/i584/i584.yaml
index 909c0b3dc..f017af54b 100644
--- a/cmd/mockbackend/testcases/i584/i584.yaml
+++ b/cmd/mockbackend/testcases/i584/i584.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i589/i589.yaml b/cmd/mockbackend/testcases/i589/i589.yaml
index 49565dec3..c5e720442 100644
--- a/cmd/mockbackend/testcases/i589/i589.yaml
+++ b/cmd/mockbackend/testcases/i589/i589.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i598/i598.yaml b/cmd/mockbackend/testcases/i598/i598.yaml
index 3ca392499..ad358807e 100644
--- a/cmd/mockbackend/testcases/i598/i598.yaml
+++ b/cmd/mockbackend/testcases/i598/i598.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/i598/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/i661/i661.yaml b/cmd/mockbackend/testcases/i661/i661.yaml
index 6b2cda9c3..e41e676fa 100644
--- a/cmd/mockbackend/testcases/i661/i661.yaml
+++ b/cmd/mockbackend/testcases/i661/i661.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/i598/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/pr500/pr500.yaml b/cmd/mockbackend/testcases/pr500/pr500.yaml
index f994ad017..1004f0158 100644
--- a/cmd/mockbackend/testcases/pr500/pr500.yaml
+++ b/cmd/mockbackend/testcases/pr500/pr500.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/pr529/pr529.yaml b/cmd/mockbackend/testcases/pr529/pr529.yaml
index 0a75eefcf..78abea6ad 100644
--- a/cmd/mockbackend/testcases/pr529/pr529.yaml
+++ b/cmd/mockbackend/testcases/pr529/pr529.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/pr560/pr560.yaml b/cmd/mockbackend/testcases/pr560/pr560.yaml
index 57202e0d2..23b8947d0 100644
--- a/cmd/mockbackend/testcases/pr560/pr560.yaml
+++ b/cmd/mockbackend/testcases/pr560/pr560.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/pr594-403-504/pr594-403-504.yaml b/cmd/mockbackend/testcases/pr594-403-504/pr594-403-504.yaml
index 0cf2e6c68..9473be4b4 100644
--- a/cmd/mockbackend/testcases/pr594-403-504/pr594-403-504.yaml
+++ b/cmd/mockbackend/testcases/pr594-403-504/pr594-403-504.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/pr594-403-504/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/pr594-maskerror/pr594-maskerror.yaml b/cmd/mockbackend/testcases/pr594-maskerror/pr594-maskerror.yaml
index 415ede7a4..57b95205a 100644
--- a/cmd/mockbackend/testcases/pr594-maskerror/pr594-maskerror.yaml
+++ b/cmd/mockbackend/testcases/pr594-maskerror/pr594-maskerror.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/pr594-maskerror/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/pr743/pr743.yaml b/cmd/mockbackend/testcases/pr743/pr743.yaml
index 7425befb4..79d119043 100644
--- a/cmd/mockbackend/testcases/pr743/pr743.yaml
+++ b/cmd/mockbackend/testcases/pr743/pr743.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/pr743/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               delay: 1
diff --git a/cmd/mockbackend/testcases/pr817/pr817.yaml b/cmd/mockbackend/testcases/pr817/pr817.yaml
index 6e5ca6c36..50d5953ff 100644
--- a/cmd/mockbackend/testcases/pr817/pr817.yaml
+++ b/cmd/mockbackend/testcases/pr817/pr817.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/pr817/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
             - endpoint: "http://127.0.0.1:8081"
               type: "GET"
diff --git a/cmd/mockbackend/testcases/render_error/render_error.yaml b/cmd/mockbackend/testcases/render_error/render_error.yaml
index e57dd6a3a..83134f220 100644
--- a/cmd/mockbackend/testcases/render_error/render_error.yaml
+++ b/cmd/mockbackend/testcases/render_error/render_error.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/render_error/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
         - endpoint: "http://127.0.0.1:8081"
           type: "GET"
diff --git a/cmd/mockbackend/testcases/render_error_all/render_error_all.yaml b/cmd/mockbackend/testcases/render_error_all/render_error_all.yaml
index d312d89d0..850514f92 100644
--- a/cmd/mockbackend/testcases/render_error_all/render_error_all.yaml
+++ b/cmd/mockbackend/testcases/render_error_all/render_error_all.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/render_error_all/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
         - endpoint: "http://127.0.0.1:8081"
           type: "GET"
diff --git a/cmd/mockbackend/testcases/render_error_all_rr/carbonapi.yaml b/cmd/mockbackend/testcases/render_error_all_rr/carbonapi.yaml
index ed6101937..a4f1f15e5 100644
--- a/cmd/mockbackend/testcases/render_error_all_rr/carbonapi.yaml
+++ b/cmd/mockbackend/testcases/render_error_all_rr/carbonapi.yaml
@@ -23,15 +23,15 @@ upstreams:
     requireSuccessAll: true
     buckets: 10
     timeouts:
-        find: "2s"
-        render: "10s"
+        find: "200s"
+        render: "1000s"
         connect: "200ms"
     concurrencyLimitPerServer: 0
     keepAliveInterval: "30s"
     maxIdleConnsPerHost: 100
     backendsv2:
         backends:
-          -
+        -
             groupName: "mock-001"
             protocol: "auto"
             lbMethod: "rr"
diff --git a/cmd/mockbackend/testcases/render_error_all_rr/render_error_all_rr.yaml b/cmd/mockbackend/testcases/render_error_all_rr/render_error_all_rr.yaml
index a401b99ae..39ebc3a35 100644
--- a/cmd/mockbackend/testcases/render_error_all_rr/render_error_all_rr.yaml
+++ b/cmd/mockbackend/testcases/render_error_all_rr/render_error_all_rr.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/testcases/render_error_all_rr/carbonapi.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
         - endpoint: "http://127.0.0.1:8081"
           type: "GET"
@@ -15,9 +17,9 @@ test:
               httpCode: 200
               contentType: "application/json"
               expectedResults:
-                      - metrics:
-                          - target: "a"
-                            datapoints: [[0,1],[1,2],[2,3],[2,4],[3,5]]
+                  - metrics:
+                      - target: "a"
+                        datapoints: [[0,1],[1,2],[2,3],[2,4],[3,5]]
 
         # empty
         - endpoint: "http://127.0.0.1:8081"
diff --git a/cmd/mockbackend/testcases/tags_error/tags_error.yaml b/cmd/mockbackend/testcases/tags_error/tags_error.yaml
index e21dd36a5..177d148c3 100644
--- a/cmd/mockbackend/testcases/tags_error/tags_error.yaml
+++ b/cmd/mockbackend/testcases/tags_error/tags_error.yaml
@@ -1,5 +1,6 @@
 version: "v1"
 test:
+    startDelay: 100ms
     apps:
         - name: "carbonapi"
           binary: "./carbonapi"
@@ -7,6 +8,7 @@ test:
               - "-config"
               - "./cmd/mockbackend/carbonapi_singlebackend.yaml"
               - "-exact-config"
+          aliveURL: "http://127.0.0.1:8081"
     queries:
         - endpoint: "http://127.0.0.1:8081"
           type: "GET"