雲端資源中心受限於地理環境及實際空間的限制，無法建置無限量的硬體設 備，當雲端服務商無法滿足客戶提出的要求，雲端服務商將使用外部的雲端資源，
與其他雲端服務商合作，將客戶的服務在不同的雲端環境之間轉移。本論文以 OpenStack 作為雲端環境管理平台為例，實作出虛擬機器在跨雲之間的動態轉移。
虛擬機器在獨立的 OpenStack 之間可以動態轉移，並且將虛擬機器的資訊由來源 端轉移到目的端，使目的端的 OpenStack 可以正確管理動態轉移的虛擬機器。本 論文以減少耗能為考量，提出選擇動態轉移目的端的 MES 演算法，經過實驗評 估，MES 演算法所選擇的目的端，比較 Random 及 Round-robin 方式選擇的目的 端，在整體的耗能評估上，MES 演算法的表現較好。
因為實驗環境的限制，OpenStack 的環境是將 Controller Node、Network Node 以及 Compute Node 建立在同一台實體機器上，使虛擬機器動態轉移指定的 Controller Node 只有一個 Compute Node。未來可以考慮多個 Compute Node 的 OpenStack 環境中，虛擬機器的動態轉移方法。此外，目前 OpenStack 的 Controller Node 是使用公開位址(Public IP)，虛擬機器跨網域的動態轉移可以辨識唯一的公 開位址，未來可以考慮 OpenStack 的 Controller Node 是使用私有位址(Private IP)，
虛擬機器跨網域的動態轉移方法。在相同 Controller Node 下，虛擬機器之間不會 位址衝突，但是虛擬機器在跨雲的環境中動態轉移，不同的虛擬網域中，可能發 生虛擬位址衝突的問題，要如何解決位址衝突的問題，以及如何轉換虛擬機器的 位址是未來值得探討的議題。
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