Merge pull request #629 from kubernetes-incubator/fix-download-once

Fix download once

.travis.yml

@@ -1,4 +1,7 @@
-sudo: false
+sudo: required
+
+services:
+  - docker
 
 git:
   depth: 5
@@ -6,6 +9,7 @@ git:
 env:
   global:
     GCE_USER=travis
+    LOG_LEVEL=-v
     SSH_USER=$GCE_USER
     TEST_ID=$TRAVIS_JOB_NUMBER
     CONTAINER_ENGINE=docker
@@ -117,11 +121,14 @@ before_install:
   # W/A https://github.com/ansible/ansible-modules-core/issues/5196#issuecomment-253766186
   - pip install --user apache-libcloud==0.20.1
   - pip install --user boto==2.9.0 -U
+  # Load cached docker images
+  - if [ -d /var/tmp/releases ]; then find /var/tmp/releases -type f -name "*.tar" | xargs -I {} sh -c "zcat {} | docker load"; fi
 
 cache:
   - directories:
     - $HOME/.cache/pip
     - $HOME/.local
+    - /var/tmp/releases
 
 before_script:
   - echo "RUN $TRAVIS_JOB_NUMBER $KUBE_NETWORK_PLUGIN $CONTAINER_ENGINE "
@@ -154,6 +161,9 @@ script:
     -b --become-user=root -e cloud_provider=gce  $LOG_LEVEL -e kube_network_plugin=${KUBE_NETWORK_PLUGIN}
     -e bootstrap_os=${BOOTSTRAP_OS}
     -e ansible_python_interpreter=${PYPATH}
+    -e download_run_once=true
+    -e download_localhost=true
+    -e local_release_dir=/var/tmp/releases
     cluster.yml
 
     # Tests Cases