diff --git a/.vsts-dotnet-ci.yml b/.vsts-dotnet-ci.yml
index 80ed1b4ac7..c2e0e2c0d4 100644
--- a/.vsts-dotnet-ci.yml
+++ b/.vsts-dotnet-ci.yml
@@ -1,15 +1,9 @@
-resources:
-  containers:
-  - container: centos7
-    image: microsoft/dotnet-buildtools-prereqs:centos-7-b46d863-20180719033416
-
 phases:
 - template: /build/ci/phase-template.yml
   parameters:
     name: Linux
     buildScript: ./build.sh
-    queue:
-      container: centos7
+    dockerImage: microsoft/dotnet-buildtools-prereqs:centos-7-b46d863-20180719033416
 
 - template: /build/ci/phase-template.yml
   parameters:
diff --git a/build/ci/phase-template.yml b/build/ci/phase-template.yml
index 2c8430465a..bd326afb69 100644
--- a/build/ci/phase-template.yml
+++ b/build/ci/phase-template.yml
@@ -1,6 +1,7 @@
 parameters:
   name: ''
   buildScript: ''
+  dockerImage: ''
   queue: {}
 
 phases:
@@ -8,6 +9,9 @@ phases:
     variables:
       _buildScript: ${{ parameters.buildScript }}
       _phaseName: ${{ parameters.name }}
+      # if dockerImage is not equal to '' then run under docker container
+      ${{ if ne(parameters.dockerImage, '') }}:
+        _PREVIEW_VSTS_DOCKER_IMAGE: ${{ parameters.dockerImage }}
     queue:
       parallel: 2
       matrix: