Fixed docker installation script (#747)

vagrant/Vagrantfile

@@ -99,7 +99,7 @@ Vagrant.configure(2) do |config|
     # non-cached ami: ami-6d1c2007
     ### USE BASE/CACHED IMAGE
     #aws.ami = "ami-6d1c2007" # base image
-    aws.ami = (ENV['SWAN_AMI'] != '' && ENV['SWAN_AMI'] || "ami-45032753") # Thu, 25 May 2017 20:29:44 +0200
+    aws.ami = (ENV['SWAN_AMI'] != '' && ENV['SWAN_AMI'] || "ami-39999c2f") # Thu, 25 May 2017 20:29:44 +0200
     if build_cached_image
       override.vm.provision "shell", path: "provision.sh", env: {
         'VAGRANT_USER' => vagrant_user,

vagrant/provision_experiment_environment.sh

@@ -36,6 +36,9 @@ K8S_VERSION="v1.6.4"
 SNAP_VERSION="1.2.0"
 ETCD_VERSION="3.1.0"
 DOCKER_VERSION="17.03.0.ce-1.el7.centos"
+# The offical Docker repository is not very, stable apparently.
+# See https://github.com/moby/moby/issues/33930#issuecomment-312782998 for explanation.
+DOCKER_INSTALL_OPTS="-y -q --setopt=obsoletes=0"
 SNAP_PLUGIN_COLLECTOR_DOCKER_VERSION=5
 SNAP_PLUGIN_COLLECTOR_RDT_VERSION=1
 SNAP_PLUGIN_COLLECTOR_USE_VERSION=1
@@ -83,7 +86,7 @@ echo "----------------------------- Install Docker (`date`)"
 # https://docs.docker.com/engine/installation/linux/centos/#install-using-the-repository
 yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
 yum makecache fast -y -q
-yum install -y -q docker-ce-${DOCKER_VERSION}
+yum install ${DOCKER_INSTALL_OPTS} docker-ce-${DOCKER_VERSION}
 echo "Restart docker"
 systemctl enable docker
 systemctl start docker