diff --git a/lib/vagrant/environment.rb b/lib/vagrant/environment.rb
index 46899197c..62d059dd1 100644
--- a/lib/vagrant/environment.rb
+++ b/lib/vagrant/environment.rb
@@ -755,9 +755,9 @@ module Vagrant
           next
         end
 
-        @logger.info("Loading plugin from JSON: #{plugin}")
+        @logger.info("Loading plugin from JSON: #{name}")
         begin
-          Vagrant.require_plugin(plugin)
+          Vagrant.require_plugin(name)
         rescue Errors::PluginLoadError => e
           @ui.error(e.message + "\n")
         rescue Errors::PluginLoadFailed => e
diff --git a/plugins/commands/plugin/action/license_plugin.rb b/plugins/commands/plugin/action/license_plugin.rb
index b69e52749..518c1824c 100644
--- a/plugins/commands/plugin/action/license_plugin.rb
+++ b/plugins/commands/plugin/action/license_plugin.rb
@@ -18,7 +18,7 @@ module VagrantPlugins
 
         def call(env)
           # Get the list of installed plugins according to the state file
-          installed = Set.new(env[:plugin_state_file].installed_plugins)
+          installed = env[:plugin_state_file].installed_plugins.keys
 
           # If the plugin we're trying to license doesn't exist in the
           # state file, then it is an error.
diff --git a/plugins/commands/plugin/action/list_plugins.rb b/plugins/commands/plugin/action/list_plugins.rb
index b3a3392b1..f5dd0574b 100644
--- a/plugins/commands/plugin/action/list_plugins.rb
+++ b/plugins/commands/plugin/action/list_plugins.rb
@@ -18,7 +18,7 @@ module VagrantPlugins
 
         def call(env)
           # Get the list of installed plugins according to the state file
-          installed = Set.new(env[:plugin_state_file].installed_plugins)
+          installed = env[:plugin_state_file].installed_plugins.keys
 
           # Go through the plugins installed in this environment and
           # get the latest version of each.
diff --git a/plugins/commands/plugin/action/plugin_exists_check.rb b/plugins/commands/plugin/action/plugin_exists_check.rb
index c56bd9c14..abe8d43cf 100644
--- a/plugins/commands/plugin/action/plugin_exists_check.rb
+++ b/plugins/commands/plugin/action/plugin_exists_check.rb
@@ -12,7 +12,7 @@ module VagrantPlugins
 
         def call(env)
           # Get the list of installed plugins according to the state file
-          installed = Set.new(env[:plugin_state_file].installed_plugins)
+          installed = env[:plugin_state_file].installed_plugins.keys
           if !installed.include?(env[:plugin_name])
             raise Vagrant::Errors::PluginNotInstalled,
               name: env[:plugin_name]
diff --git a/plugins/commands/plugin/action/prune_gems.rb b/plugins/commands/plugin/action/prune_gems.rb
index ae5a38196..d5e754994 100644
--- a/plugins/commands/plugin/action/prune_gems.rb
+++ b/plugins/commands/plugin/action/prune_gems.rb
@@ -34,7 +34,7 @@ module VagrantPlugins
           @logger.info("Pruning gems...")
 
           # Get the list of installed plugins according to the state file
-          installed = Set.new(env[:plugin_state_file].installed_plugins)
+          installed = env[:plugin_state_file].installed_plugins.keys
 
           # Get the actual specifications of installed gems
           all_specs = env[:gem_helper].with_environment do
diff --git a/plugins/commands/plugin/state_file.rb b/plugins/commands/plugin/state_file.rb
index 6860bdd09..7846bf7b0 100644
--- a/plugins/commands/plugin/state_file.rb
+++ b/plugins/commands/plugin/state_file.rb
@@ -32,11 +32,11 @@ module VagrantPlugins
         save!
       end
 
-      # This returns a list of installed plugins according to the state
+      # This returns a hash of installed plugins according to the state
       # file. Note that this may _not_ directly match over to actually
       # installed gems.
       #
-      # @return [Array<String>]
+      # @return [Hash]
       def installed_plugins
         @data["installed"]
       end
diff --git a/plugins/providers/virtualbox/synced_folder.rb b/plugins/providers/virtualbox/synced_folder.rb
index 47b9c945e..52d642a05 100644
--- a/plugins/providers/virtualbox/synced_folder.rb
+++ b/plugins/providers/virtualbox/synced_folder.rb
@@ -62,7 +62,7 @@ module VagrantPlugins
       end
 
       def cleanup(machine)
-        driver.clear_shared_folders
+        driver(machine).clear_shared_folders
       end
 
       protected
diff --git a/plugins/provisioners/chef/provisioner/base.rb b/plugins/provisioners/chef/provisioner/base.rb
index 9f41a0e95..f62666078 100644
--- a/plugins/provisioners/chef/provisioner/base.rb
+++ b/plugins/provisioners/chef/provisioner/base.rb
@@ -41,7 +41,7 @@ module VagrantPlugins
 
         def chown_provisioning_folder
           paths = [@config.provisioning_path,
-                   @config.file_backup_pach,
+                   @config.file_backup_path,
                    @config.file_cache_path]
 
           @machine.communicate.tap do |comm|
diff --git a/plugins/provisioners/docker/docker_client.rb b/plugins/provisioners/docker/docker_client.rb
index 535c6e9fc..7affc7c3a 100644
--- a/plugins/provisioners/docker/docker_client.rb
+++ b/plugins/provisioners/docker/docker_client.rb
@@ -44,15 +44,15 @@ module VagrantPlugins
 
         id = "$(cat #{config[:cidfile]})"
 
-        if container_exist?(id)
+        if container_exists?(id)
           start_container(id)
         else
           create_container(config)
         end
       end
 
-      def container_exist?(id)
-        @machine.communicate.test("sudo docker ps -a -q | grep -q #{id}")
+      def container_exists?(id)
+        lookup_container(id, true)
       end
 
       def start_container(id)
@@ -62,7 +62,7 @@ module VagrantPlugins
       end
 
       def container_running?(id)
-        @machine.communicate.test("sudo docker ps -q | grep #{id}")
+        lookup_container(id)
       end
 
       def create_container(config)
@@ -73,6 +73,18 @@ module VagrantPlugins
           docker run #{args} #{config[:image]} #{config[:cmd]}
         ]
       end
+
+      def lookup_container(id, list_all = false)
+        docker_ps = "sudo docker ps -q"
+        docker_ps << " -a" if list_all
+        @machine.communicate.tap do |comm|
+          # Docker < 0.7.0 stores container IDs using its short version while
+          # recent versions use the full container ID
+          # See https://github.com/dotcloud/docker/pull/2140 for more information
+          return comm.test("#{docker_ps} | grep -wFq #{id}") ||
+                   comm.test("#{docker_ps} -notrunc | grep -wFq #{id}")
+        end
+      end
     end
   end
 end
diff --git a/website/docs/source/v2/vagrantfile/version.html.md b/website/docs/source/v2/vagrantfile/version.html.md
index 6e28d6797..39e604a86 100644
--- a/website/docs/source/v2/vagrantfile/version.html.md
+++ b/website/docs/source/v2/vagrantfile/version.html.md
@@ -6,7 +6,7 @@ sidebar_current: "vagrantfile-version"
 # Configuration Version
 
 Configuration versions are the mechanism by which Vagrant 1.1+ is able
-to remain [backwards compatible](v2/installation/backwards-compatibility.html)
+to remain [backwards compatible](/v2/installation/backwards-compatibility.html)
 with Vagrant 1.0.x Vagrantfiles, while introducing dramatically new features
 and configuration options.