docs: build de 9ab730a738
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382 changed files with 64868 additions and 4 deletions
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0.2.0rc001/concepts/metadata-cloud-init.html
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0.2.0rc001/concepts/metadata-cloud-init.html
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<!DOCTYPE html>
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<html lang="fr" data-content_root="../" >
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Metadata et cloud-init — Documentation two 0.1.0</title>
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<script data-cfasync="false">
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document.documentElement.dataset.theme = localStorage.getItem("theme") || "";
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</script>
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this give us a css class that will be invisible only if js is disabled
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-->
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<noscript>
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<style>
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.pst-js-only { display: none !important; }
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</style>
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</noscript>
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<link href="../_static/styles/theme.css?digest=8878045cc6db502f8baf" rel="stylesheet" />
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<link href="../_static/styles/pydata-sphinx-theme.css?digest=8878045cc6db502f8baf" rel="stylesheet" />
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<link rel="stylesheet" type="text/css" href="../_static/pygments.css?v=8f2a1f02" />
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<script src="../_static/documentation_options.js?v=4d0cb239"></script>
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<script src="../_static/doctools.js?v=fd6eb6e6"></script>
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<script src="https://cdn.jsdelivr.net/npm/d3@7.9.0/dist/d3.min.js"></script>
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/* Same as .mermaid-container > pre > svg */
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align-items: center;
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justify-content: center;
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}
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.mermaid-container-fullscreen .mermaid svg {
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height: 100% !important;
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width: 100% !important;
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cursor: grab;
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border-radius: 50%;
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cursor: pointer;
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align-items: center;
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justify-content: center;
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box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
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transition: all 0.2s;
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font-size: 24px;
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line-height: 1;
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color: #333;
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}
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.mermaid-fullscreen-close:hover {
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background: white;
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box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
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transform: scale(1.1);
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}
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background: rgba(50, 50, 50, 0.95);
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border: 1px solid rgba(255, 255, 255, 0.2);
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color: #e0e0e0;
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}
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.mermaid-fullscreen-close.dark-theme:hover {
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background: rgba(60, 60, 60, 1);
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box-shadow: 0 6px 16px rgba(255, 255, 255, 0.2);
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}
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.mermaid-fullscreen-modal .mermaid-fullscreen-btn {
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display: none !important;
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}`;
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document.head.appendChild(fullscreenStyle);
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// 1. Check for common dark mode classes or attributes
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// 2. Check computed background color brightness
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document.documentElement.getAttribute('data-theme') === 'dark' ||
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document.body.classList.contains('dark') ||
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document.body.getAttribute('data-theme') === 'dark') {
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// console.log("Dark theme detected via class/attribute");
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return true;
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if (document.documentElement.classList.contains('light') ||
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document.documentElement.getAttribute('data-theme') === 'light' ||
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document.body.classList.contains('light') ||
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document.body.getAttribute('data-theme') === 'light') {
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// console.log("Light theme detected via class/attribute");
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return false;
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if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
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// console.log(`Storing original code for re-run: `, el.innerHTML);
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el.setAttribute('data-original-code', el.innerHTML);
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});
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await mermaid.run();
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all_mermaids = document.querySelectorAll(".mermaid");
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var svgs = d3.selectAll("");
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if(all_mermaids.length !== mermaids_processed.length) {
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setTimeout(() => runMermaid(false), 200);
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return;
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} else if(svgs.size() !== mermaids_to_add_zoom) {
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setTimeout(() => runMermaid(false), 200);
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return;
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} else {
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svgs.each(function() {
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var svg = d3.select(this);
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svg.html("<g class='wrapper'>" + svg.html() + "</g>");
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var inner = svg.select("g");
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var zoom = d3.zoom().on("zoom", function(event) {
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inner.attr("transform", event.transform);
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});
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svg.call(zoom);
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});
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}
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}
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// Wait for mermaid to process all diagrams
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setTimeout(() => runMermaid(false), 200);
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return;
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// Stop here if not adding fullscreen capability
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if ("True" !== "True") return;
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if (modal !== null ) {
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// Destroy existing modal
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modal.remove();
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modal = null;
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modalContent = null;
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}
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modal = document.createElement('div');
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modal.className = 'mermaid-fullscreen-modal' + (darkTheme ? ' dark-theme' : '');
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modal.setAttribute('role', 'dialog');
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modal.setAttribute('aria-modal', 'true');
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modal.setAttribute('aria-label', 'Fullscreen diagram viewer');
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modal.innerHTML = `
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<button class="mermaid-fullscreen-close${darkTheme ? ' dark-theme' : ''}" aria-label="Close fullscreen">✕</button>
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<div class="mermaid-container-fullscreen${darkTheme ? ' dark-theme' : ''}"></div>
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`;
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document.body.appendChild(modal);
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modalContent = modal.querySelector('.mermaid-container-fullscreen');
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const closeBtn = modal.querySelector('.mermaid-fullscreen-close');
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const closeModal = () => {
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modal.classList.remove('active');
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modalContent.innerHTML = '';
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document.body.style.overflow = ''
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window.scrollTo({left: previousScrollOffset[0], top: previousScrollOffset[1], behavior: 'instant'});
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};
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closeBtn.addEventListener('click', closeModal);
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modal.addEventListener('click', (e) => {
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if (e.target === modal) closeModal();
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});
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document.addEventListener('keydown', (e) => {
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if (e.key === 'Escape' && modal.classList.contains('active')) {
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closeModal();
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}
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});
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document.querySelectorAll('.mermaid').forEach((mermaidDiv) => {
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if (mermaidDiv.parentNode.classList.contains('mermaid-container') ||
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mermaidDiv.closest('.mermaid-fullscreen-modal')) {
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// Already processed, adjust button class if needed
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const existingBtn = mermaidDiv.parentNode.querySelector('.mermaid-fullscreen-btn');
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if (existingBtn) {
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existingBtn.className = 'mermaid-fullscreen-btn' + (darkTheme ? ' dark-theme' : '');
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}
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return;
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}
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const container = document.createElement('div');
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container.className = 'mermaid-container';
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mermaidDiv.parentNode.insertBefore(container, mermaidDiv);
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container.appendChild(mermaidDiv);
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const fullscreenBtn = document.createElement('button');
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fullscreenBtn.className = 'mermaid-fullscreen-btn' + (darkTheme ? ' dark-theme' : '');
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fullscreenBtn.setAttribute('aria-label', 'View diagram in fullscreen');
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fullscreenBtn.textContent = '⛶';
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fullscreenBtn.style.opacity = '50%';
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// Calculate dynamic position based on diagram's margin and padding
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const diagramStyle = window.getComputedStyle(mermaidDiv);
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const marginTop = parseFloat(diagramStyle.marginTop) || 0;
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const marginRight = parseFloat(diagramStyle.marginRight) || 0;
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const paddingTop = parseFloat(diagramStyle.paddingTop) || 0;
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const paddingRight = parseFloat(diagramStyle.paddingRight) || 0;
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fullscreenBtn.style.top = `${marginTop + paddingTop + 4}px`;
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fullscreenBtn.style.right = `${marginRight + paddingRight + 4}px`;
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fullscreenBtn.addEventListener('click', () => {
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previousScrollOffset = [window.scroll, window.scrollY];
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const clone = mermaidDiv.cloneNode(true);
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modalContent.innerHTML = '';
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modalContent.appendChild(clone);
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const svg = clone.querySelector('svg');
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if (svg) {
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svg.removeAttribute('width');
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svg.removeAttribute('height');
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svg.style.width = '100%';
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svg.style.height = 'auto';
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svg.style.maxWidth = '100%';
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svg.style.sdisplay = 'block';
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if ("False" === "True") {
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setTimeout(() => {
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const g = svg.querySelector('g');
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if (g) {
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var svgD3 = d3.select(svg);
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svgD3.html("<g class='wrapper'>" + svgD3.html() + "</g>");
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var inner = svgD3.select("g");
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var zoom = d3.zoom().on("zoom", function(event) {
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inner.attr("transform", event.transform);
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});
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svgD3.call(zoom);
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}
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}, 100);
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}
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}
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modal.classList.add('active');
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document.body.style.overflow = 'hidden';
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});
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container.appendChild(fullscreenBtn);
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});
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};
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const load = async () => {
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initStyles();
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await runMermaid(true);
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const reRunIfThemeChanges = async () => {
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const newDarkTheme = isDarkTheme();
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if (newDarkTheme !== darkTheme) {
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darkTheme = newDarkTheme;
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console.log("Theme change detected, re-running mermaid with", darkTheme ? "dark" : "default", "theme");
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await mermaid.initialize(
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{...JSON.parse(
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`{"startOnLoad": false}`
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),
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...{ darkMode: darkTheme, theme: darkTheme ? 'dark' : 'default' },
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}
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);
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await runMermaid(true);
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}
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};
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// Update theme classes when theme changes
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const themeObserver = new MutationObserver(reRunIfThemeChanges);
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<section id="metadata-et-cloud-init">
|
||||
<h1>Metadata et cloud-init<a class="headerlink" href="#metadata-et-cloud-init" title="Lien vers cette rubrique">#</a></h1>
|
||||
<p>Chaque VM dispose d’un serveur de metadata NoCloud, servi sur <code class="docutils literal notranslate"><span class="pre">169.254.169.254</span></code> dans le netns
|
||||
de son VPC, sous la forme d’une instance systemd <code class="docutils literal notranslate"><span class="pre">metadata@<vm></span></code>.</p>
|
||||
<section id="chaine-de-production">
|
||||
<h2>Chaîne de production<a class="headerlink" href="#chaine-de-production" title="Lien vers cette rubrique">#</a></h2>
|
||||
<pre class="mermaid">
|
||||
graph LR
|
||||
A["agent<br/>WriteNoCloudFiles"] -->|"/run/two/metadata/&lt;vm&gt;/"| M["binaire metadata"]
|
||||
M -->|HTTP 169.254.169.254| G["guest<br/>cloud-init"]
|
||||
</pre><p>L’agent écrit les fichiers cloud-init sur disque <strong>avant</strong> de démarrer le service ; le binaire
|
||||
<code class="docutils literal notranslate"><span class="pre">metadata</span></code> les lit et les sert. Le processus <code class="docutils literal notranslate"><span class="pre">metadata</span></code> n’ouvre <strong>jamais</strong> la base Badger :
|
||||
deux processus ne doivent pas partager une même instance.</p>
|
||||
</section>
|
||||
<section id="documents-servis">
|
||||
<h2>Documents servis<a class="headerlink" href="#documents-servis" title="Lien vers cette rubrique">#</a></h2>
|
||||
<p>Chaque document suit la même règle :</p>
|
||||
<ul class="simple">
|
||||
<li><p>fourni par l’appelant → servi <strong>verbatim</strong>, l’agent n’interprète rien ;</p></li>
|
||||
<li><p>absent → le template par défaut est rendu ;</p></li>
|
||||
<li><p>fourni <strong>vide</strong> → servi vide.</p></li>
|
||||
</ul>
|
||||
<p>Les deux derniers cas sont distincts, et c’est délibéré : fournir une chaîne vide est une façon
|
||||
explicite de neutraliser un document.</p>
|
||||
</section>
|
||||
<section id="champs-de-metadata">
|
||||
<h2>Champs de <code class="docutils literal notranslate"><span class="pre">metadata</span></code><a class="headerlink" href="#champs-de-metadata" title="Lien vers cette rubrique">#</a></h2>
|
||||
<dl class="simple">
|
||||
<dt><code class="docutils literal notranslate"><span class="pre">sshkey</span></code></dt><dd><p>Clé publique ajoutée au compte <code class="docutils literal notranslate"><span class="pre">syonad</span></code>. Transmise telle quelle, non encodée.</p>
|
||||
</dd>
|
||||
<dt><code class="docutils literal notranslate"><span class="pre">password</span></code></dt><dd><p>Un <strong>hash</strong>, tel qu’attendu par la clé <code class="docutils literal notranslate"><span class="pre">passwd</span></code> de cloud-config (<code class="docutils literal notranslate"><span class="pre">$6$…</span></code>) — jamais un mot
|
||||
de passe en clair. Omis, le compte est créé verrouillé ; sans <code class="docutils literal notranslate"><span class="pre">password</span></code> ni <code class="docutils literal notranslate"><span class="pre">sshkey</span></code>,
|
||||
aucun compte n’est créé.</p>
|
||||
</dd>
|
||||
<dt><code class="docutils literal notranslate"><span class="pre">user_data</span></code></dt><dd><p>Le user-data cloud-init, <strong>encodé en base64</strong>. L’encodage évite l’échappement JSON des
|
||||
documents multi-lignes et autorise les charges <code class="docutils literal notranslate"><span class="pre">gzip+base64</span></code>. Un base64 invalide est rejeté
|
||||
en 400 plutôt que servi vide.</p>
|
||||
</dd>
|
||||
</dl>
|
||||
</section>
|
||||
<section id="instance-id">
|
||||
<h2><code class="docutils literal notranslate"><span class="pre">instance-id</span></code><a class="headerlink" href="#instance-id" title="Lien vers cette rubrique">#</a></h2>
|
||||
<p><code class="docutils literal notranslate"><span class="pre">instance-id</span></code> vaut le <strong>nom de la VM</strong>. Recréer une VM du même nom sur le même disque fait que
|
||||
cloud-init la reconnaît comme déjà provisionnée et <strong>n’applique pas</strong> le user-data. Pour rejouer
|
||||
un provisionnement : changer de nom, repartir d’un disque neuf, ou exécuter
|
||||
<code class="docutils literal notranslate"><span class="pre">cloud-init</span> <span class="pre">clean</span> <span class="pre">--logs</span></code> dans le guest avant l’extinction.</p>
|
||||
</section>
|
||||
<section id="configuration-reseau">
|
||||
<h2>Configuration réseau<a class="headerlink" href="#configuration-reseau" title="Lien vers cette rubrique">#</a></h2>
|
||||
<div class="admonition warning">
|
||||
<p class="admonition-title">Avertissement</p>
|
||||
<p><code class="docutils literal notranslate"><span class="pre">network-config.tmpl</span></code> cible <code class="docutils literal notranslate"><span class="pre">eth0</span></code> alors que les guests utilisent <code class="docutils literal notranslate"><span class="pre">ens3</span></code> : il ne
|
||||
s’applique donc à rien, et le réseau des VM vient du DHCP. <strong>Ne pas le « corriger » ni le
|
||||
supprimer.</strong> Le rendre opérant ferait remplacer par cloud-init la configuration réseau de
|
||||
l’image, sur toutes les VM.</p>
|
||||
</div>
|
||||
</section>
|
||||
<section id="securite">
|
||||
<h2>Sécurité<a class="headerlink" href="#securite" title="Lien vers cette rubrique">#</a></h2>
|
||||
<p><code class="docutils literal notranslate"><span class="pre">/run/two/metadata/<vm>/vendor-data</span></code> est en <code class="docutils literal notranslate"><span class="pre">0644</span></code> et contient le hash de mot de passe. Tout
|
||||
compte local du host peut le lire. C’est une exposition connue et acceptée en l’état ; elle
|
||||
disqualifie l’usage de hashs faibles ou réutilisés.</p>
|
||||
</section>
|
||||
</section>
|
||||
|
||||
|
||||
</article>
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||||
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||||
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||||
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<div class="sidebar-secondary-item"><div
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class="page-toc tocsection onthispage">
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<i class="fa-solid fa-list"></i> Contenu
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<ul class="visible nav section-nav flex-column">
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#chaine-de-production">Chaîne de production</a></li>
|
||||
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#documents-servis">Documents servis</a></li>
|
||||
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#champs-de-metadata">Champs de <code class="docutils literal notranslate"><span class="pre">metadata</span></code></a></li>
|
||||
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#instance-id"><code class="docutils literal notranslate"><span class="pre">instance-id</span></code></a></li>
|
||||
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#configuration-reseau">Configuration réseau</a></li>
|
||||
<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#securite">Sécurité</a></li>
|
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</ul>
|
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<p class="component-author">
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Par Nicolas Boufidjeline
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© Copyright 2026, Nicolas Boufidjeline.
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