DRBL-Virtualization (drbl-virt)

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【想法】

• DRBL 本身就是一套叢集佈署軟體 (Cluster deployment tools)，drbl-virt 則是是一個 DRBL 的模組，可在原有的 DRBL 環境上建置虛擬化環境
• 竟然 DRBL 可用來佈署實體機器，何不利用其特性來佈署虛擬機器呢
• ​drbl-virt 官網 (Google code)

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【功能】

[系統層]

• Hypervisior(Xen, KVM, VirtualBox...) 安裝
• Patch DRBL to support virtualization

[虛擬資源層]

• VM 產生類型
  • Diskless VM
  • 若 Client 使用 local HD，則可以產生 Image-based 的 VM

[管理層]

• 實體機器管理
• 虛擬機器管理
• shell 管理圖片
• web 管理圖片?

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【Roadmap】

• 2009/08/31 初版發佈 (目前僅支援 Debian lenny 和 Xen)
• 2009/09/31 減少安裝程序的詢問步驟
• 2009/10/31 整合 KVM
• 2009/11/31 新增網頁介面

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【架構圖】

[安裝流程圖]

[網頁流程圖]

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【問題碎碎念】

• drbl_bridge_kvm_patch：再開機時產生 bridge (br0) 之後會遇到找不到 NFS server，而產生 kernel panic。但產生的 bridge 若名稱為 bridge (eth0) 則可以正常運作。
  • 猜測掛載 NFS 時只會使用正常名稱的網路設備 eth (而非 br0)
• drbl_PXE_KVM-VM_deploy：再 deploy KVM VM 時網路會有一小段時間中斷，dmesg 時會出現 bridge 設備的相關訊息(浸入混亂模式...等等)。
  • 但有趣的是同樣是用 bridge 方式的 Xen VM，卻不會有其狀況，可能狀況是 KVM 額外用的 tap 機制會先 down 原來的網路設備再 bridge 過去，導致短暫時間的網路中斷，或許可以朝 KVM 的 tap 運作這方向研究一下。

    [ 3094.923757] device tap1 entered promiscuous mode
    [ 3094.923757] eth0: port 3(tap1) entering learning state
    [ 3094.923759] eth0: topology change detected, propagating
    [ 3094.923812] eth0: port 3(tap1) entering forwarding state
    [ 3111.080606] tap1: no IPv6 routers present
    [ 3177.729006] eth0: port 3(tap1) entering disabled state
    [ 3177.741005] device tap1 left promiscuous mode
    [ 3177.741055] eth0: port 3(tap1) entering disabled state
    [ 3247.704954] nfs: server 192.168.0.254 not responding, still trying
    [ 3247.716962] nfs: server 192.168.0.254 not responding, still trying
    [ 3265.098977] nfs: server 192.168.0.254 OK
    [ 3265.098977] nfs: server 192.168.0.254 OK
    [ 3374.350940] device tap1 entered promiscuous mode
    [ 3374.350999] eth0: port 3(tap1) entering learning state
    [ 3374.354588] eth0: topology change detected, propagating
    [ 3374.354641] eth0: port 3(tap1) entering forwarding state
    [ 3390.236338] tap1: no IPv6 routers present
    [ 3459.817440] eth0: port 3(tap1) entering disabled state
    [ 3459.833495] device tap1 left promiscuous mode
    [ 3459.833544] eth0: port 3(tap1) entering disabled state
    [ 3516.902404] nfs: server 192.168.0.254 not responding, still trying
    [ 3531.835094] nfs: server 192.168.0.254 OK
    [ 3864.515775] device tap1 entered promiscuous mode
    [ 3864.515775] eth0: port 3(tap1) entering learning state
    [ 3864.516286] eth0: topology change detected, propagating
    [ 3864.516340] eth0: port 3(tap1) entering forwarding state
    [ 3880.818880] tap1: no IPv6 routers present
    [ 4188.100115] eth0: port 3(tap1) entering disabled state
    [ 4188.111312] device tap1 left promiscuous mode
    [ 4188.111361] eth0: port 3(tap1) entering disabled state
    [ 4259.250465] nfs: server 192.168.0.254 not responding, still trying
    [ 4259.262465] nfs: server 192.168.0.254 not responding, still trying
    [ 4278.774055] nfs: server 192.168.0.254 OK
    [ 4278.774055] nfs: server 192.168.0.254 OK
    

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【Reference】

• ​DRBL