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feat: 가상화 문서들 추가

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DongHyeonka
2026-09-10 08:54:05 +09:00
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docs/keycloak-session-store/final/assets/guest-as-host-process/guest-as-host-process.alt.md
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# 게스트 두 대는 호스트에서 qemu 프로세스 두 개다
## Alternative text
호스트 안에 libvirtd·machine.slice·virbr0 와 qemu 프로세스 두 개가 있고, 각 프로세스가 게스트 하나씩을 담는 배치도.
## Long description
위에서 아래로 읽는다. 호스트 test-server 경계 안에 libvirtd 가 있고 그 아래에 qemu-system-x86_64 프로세스가 게스트 수만큼 있다. 경계 밖 아래쪽에 게스트 kc-lab-1 과 kc-lab-2 가 각각 따로 있고, 게스트가 보는 디스크와 인터페이스는 자기를 담은 프로세스가 virtio 로 내준다. 프로세스에 적힌 RSS 와 게스트에 적힌 available 은 같은 메모리를 다른 껍질에서 읽은 값이다. machine.slice 와 virbr0 는 이 그림에 넣지 않았고 본문이 맡는다.
## Elements and evidence
- **Boundary: 호스트 test-server** (system): libvirtd 와 게스트 프로세스가 함께 도는 호스트 경계. Evidence: L946–L948, L956–L956.
- **Boundary: 게스트 kc-lab-1** (system): qemu 프로세스 하나가 담는 Debian 게스트. Evidence: L987–L990, L1039–L1039.
- **Boundary: 게스트 kc-lab-2** (system): 나머지 qemu 프로세스가 담는 Debian 게스트. Evidence: L1033–L1033, L1040–L1040.
- **libvirtd** (service): 게스트마다 qemu-system-x86_64 를 하나씩 띄우는 호스트 데몬. htop 트리 뷰에서 그 아래에 게스트 프로세스가 달린다. Evidence: L946–L948, L956–L956.
- **qemu-system-x86_64** (service): kc-lab-1 게스트 전체가 들어 있는 호스트 프로세스. vCPU 는 이 프로세스의 스레드이고 RSS 는 게스트가 터치한 페이지만큼이다. Evidence: L946–L948, L987–L987, L1032–L1032.
- **qemu-system-x86_64** (service): kc-lab-2 게스트 전체가 들어 있는 호스트 프로세스. A-4 의 virsh destroy 가 끊는 것이 이 프로세스다. Evidence: L946–L948, L967–L976, L1033–L1033.
- **Debian 게스트 커널** (service): virtio 장치만 보는 게스트. free 가 읽는 값이 여기 있다. Evidence: L994–L998, L1039–L1039.
- **Debian 게스트 커널** (service): 같은 방식으로 붙은 두 번째 게스트. Evidence: L994–L998, L1040–L1040.
## Relationships
- **libvirtd → qemu-system-x86_64:** 프로세스 생성. Evidence: L946–L948, L956–L956.
- **libvirtd → qemu-system-x86_64:** 프로세스 생성. Evidence: L946–L948, L956–L956.
- **qemu-system-x86_64 → Debian 게스트 커널:** virtio 디스크 · virtio-net. Evidence: L987–L990, L994–L998.
- **qemu-system-x86_64 → Debian 게스트 커널:** virtio 디스크 · virtio-net. Evidence: L987–L990, L994–L998.
docs/keycloak-session-store/final/assets/guest-as-host-process/guest-as-host-process.d2
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# 게스트 두 대는 호스트에서 qemu 프로세스 두 개다
# Question: 호스트에서 게스트는 무엇으로 존재하고, 게스트가 보는 장치는 누가 만들어 주는가
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docs/keycloak-session-store/final/assets/guest-as-host-process/guest-as-host-process.drawio
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docs/keycloak-session-store/final/assets/guest-as-host-process/guest-as-host-process.manifest.json
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docs/keycloak-session-store/final/assets/guest-as-host-process/guest-as-host-process.mmd
+18
View File
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%% 게스트 두 대는 호스트에서 qemu 프로세스 두 개다
%% question: 호스트에서 게스트는 무엇으로 존재하고, 게스트가 보는 장치는 누가 만들어 주는가
flowchart TB
subgraph g_host_zone["호스트 test-server"]
n0["libvirtd"]
n1["qemu-system-x86_64"]
n2["qemu-system-x86_64"]
end
subgraph g_guest_1_zone["게스트 kc-lab-1"]
n3["Debian 게스트 커널"]
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subgraph g_guest_2_zone["게스트 kc-lab-2"]
n4["Debian 게스트 커널"]
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n0 -->|"프로세스 생성"| n1
n0 -->|"프로세스 생성"| n2
n1 -->|"virtio 디스크 · virtio-net"| n3
n2 -->|"virtio 디스크 · virtio-net"| n4
docs/keycloak-session-store/final/assets/guest-as-host-process/guest-as-host-process.svg
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<text class="edge-label" x="176.2" y="391.0">virtio 디스크 · virtio-net</text>
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<text class="edge-label" x="413.8" y="386.8">virtio 디스크 · virtio-net</text>
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<text class="node-label" x="295.0" y="108.0">libvirtd</text>
<line class="node-detail-divider" x1="234.0" y1="129.0" x2="356.0" y2="129.0" />
<text class="node-detail" x="236.0" y="146.0">qemu:///system</text>
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<text class="node-label" x="185.0" y="275.0">qemu-system-x86_64</text>
<line class="node-detail-divider" x1="119.0" y1="296.0" x2="251.0" y2="296.0" />
<text class="node-detail" x="121.0" y="313.0">kc-lab-1</text>
<text class="node-detail" x="121.0" y="329.0">vCPU 2</text>
<text class="node-detail" x="121.0" y="345.0">할당 3584MB</text>
<text class="node-detail" x="121.0" y="361.0">RSS 3765MB</text>
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<rect class="node-shape kind-service emphasis-normal role-service" data-evidence="946-948,967-976,1033-1033" x="325.0" y="256.5" width="160.0" height="105.0" rx="7" />
<text class="node-label" x="405.0" y="283.5">qemu-system-x86_64</text>
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<text class="node-detail" x="341.0" y="321.5">kc-lab-2</text>
<text class="node-detail" x="341.0" y="337.5">할당 2560MB</text>
<text class="node-detail" x="341.0" y="353.5">RSS 2633MB</text>
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<text class="node-label" x="167.5" y="493.0">Debian 게스트 커널</text>
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<text class="node-detail" x="86.0" y="531.0">enp1s0 · 192.168.122.11</text>
<text class="node-detail" x="86.0" y="547.0">총 3423MB</text>
<text class="node-detail" x="86.0" y="563.0">available 1959MB</text>
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<text class="node-label" x="422.5" y="493.0">Debian 게스트 커널</text>
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<text class="node-detail" x="341.0" y="531.0">enp1s0 · 192.168.122.12</text>
<text class="node-detail" x="341.0" y="547.0">총 2480MB</text>
<text class="node-detail" x="341.0" y="563.0">available 1899MB</text>
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