merge 4.0 code

README.md

@@ -32,6 +32,12 @@ FYI, the `gh-pages` branch stores the slide files, mostly in markdown format.
 ## History
 
 
+**v4.0** / 第四梯次 (2015-05-09)
+
+  - 簡化 Vagrant 虛擬機數量。
+  - 增加「極簡化 Docker」實例，解釋 rootfs、dependency 與 isolation 性質。
+
+
 **v3.0** / 第三梯次 (2015-04-11)
 
   - 簡化 Vagrant 環境設定程序。

Vagrantfile

@@ -28,6 +28,9 @@ Vagrant.configure(2) do |config|
         for f in PROVISION_SCRIPTS
             node.vm.provision "shell", path: f
         end
+        node.vm.provision "shell", inline: <<-SHELL
+            sudo apt-get install -y tree
+        SHELL
 
         node.vm.provider "virtualbox" do |vb|
             vb.customize ["modifyvm", :id, "--memory", "1024"]
@@ -37,37 +40,6 @@ Vagrant.configure(2) do |config|
     end
 
 
-    config.vm.define "alice" do |node|
-
-        node.vm.box = "williamyeh/ubuntu-trusty64-docker"
-        node.vm.box_version = ">= 1.5.0"
-
-        node.vm.network "private_network", ip: "10.0.0.11"
-
-        node.vm.synced_folder ".", SYNCED_FOLDER
-
-        for f in PROVISION_SCRIPTS
-            node.vm.provision "shell", path: f
-        end
-
-    end
-
-
-    config.vm.define "bob" do |node|
-
-        node.vm.box = "williamyeh/ubuntu-trusty64-docker"
-        node.vm.box_version = ">= 1.5.0"
-
-        node.vm.network "private_network", ip: "10.0.0.12"
-
-        node.vm.synced_folder ".", SYNCED_FOLDER
-
-        for f in PROVISION_SCRIPTS
-            node.vm.provision "shell", path: f
-        end
-
-    end
-
 
     config.vm.define "centos" do |node|
         node.vm.box = "chef/centos-5.11"
@@ -78,6 +50,10 @@ Vagrant.configure(2) do |config|
         # [NOTE] unmark this while benchmarking VM startup time
         #node.vm.box_check_update = false
 
+        node.vm.provision "shell", inline: <<-SHELL
+            sudo yum -y install tree
+        SHELL
+
         node.vm.provider "virtualbox" do |vb|
             vb.customize ["modifyvm", :id, "--memory", "256"]
         end

build-redis-mini/.dockerignore

@@ -0,0 +1 @@
+src

build-redis-mini/Dockerfile

@@ -0,0 +1,12 @@
+# a minimal Dockerized `redis-server`
+
+FROM scratch
+
+ADD  rootfs.tar.gz  /
+COPY redis.conf     /etc/redis/redis.conf
+
+# Redis port.
+EXPOSE 6379
+
+
+CMD ["redis-server"]