.. หัวข้อ: เนมสเปซเครือข่าย Linux และ Visualizer
.. บุ้ง: linux-namespace-visualizer
.. วันที่: 27-03-2026 12:00:00 UTC
.. แท็ก: ลินุกซ์ , เครือข่ายเนมสเปซ , veth , คอนเทนเนอร์ , ระบบผู้ดูแลระบบ , เครื่องคิดเลข , เครื่องมือ
..หมวดหมู่ : เครื่องคิดเลข
.. ลิงค์:
.. คำอธิบาย: วางรายการ ip netns, การแสดงลิงก์ ip และเอาต์พุตแสดง ip addr เพื่อแสดงไดอะแกรมโทโพโลยีของเนมสเปซเครือข่าย Linux, คู่ veth, บริดจ์ และการกำหนด IP
.. ประเภท: ข้อความ
<style>
/* ── CANONICAL DESIGN SYSTEM ──────────────────────────────────────────────── */
.calc-container { max-width: 900px; margin: 20px auto; padding: 20px; }
.calc-header { margin-bottom: 30px; padding: 25px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); color: white; }
.calc-header h2 { margin-top: 0; color: white; font-size: 28px; margin-bottom: 10px; }
.calc-header p  { margin: 10px 0; opacity: 0.95; font-size: 15px; }
.input-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 15px; margin-top: 20px; }
.input-group { display: flex; flex-direction: column; }
.input-group label { margin-bottom: 8px; font-weight: 600; color: rgba(255,255,255,0.95); font-size: 14px; }
.input-group input, .input-group select, .input-group textarea { padding: 14px; font-size: 14px; border: 2px solid rgba(255,255,255,0.3); border-radius: 6px; background: rgba(255,255,255,0.95); transition: all 0.3s ease; box-sizing: border-box; font-family: inherit; }
.input-group input:focus, .input-group select:focus, .input-group textarea:focus { outline: none; border-color: #4CAF50; background: white; box-shadow: 0 0 0 3px rgba(76,175,80,0.1); }
.input-group textarea { resize: vertical; min-height: 80px; font-family: 'Courier New', monospace; font-size: 13px; }
.button-container { margin-top: 20px; display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; }
.calc-button { padding: 14px 35px; font-size: 16px; background: #4CAF50; color: white; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; transition: all 0.3s ease; box-shadow: 0 2px 4px rgba(0,0,0,0.2); }
.calc-button:hover  { background: #45a049; transform: translateY(-1px); box-shadow: 0 4px 8px rgba(0,0,0,0.3); }
.calc-button:active { background: #3d8b40; transform: translateY(0); }
.calc-button.secondary { background: rgba(255,255,255,0.2); }
.calc-button.secondary:hover { background: rgba(255,255,255,0.3); transform: translateY(-1px); }
.result-section { background: white; border: 1px solid #e0e0e0; border-radius: 8px; margin-top: 20px; overflow: hidden; box-shadow: 0 2px 4px rgba(0,0,0,0.05); transition: all 0.3s ease; }
.result-section:hover { box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
.section-header { background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%); color: white; padding: 15px 20px; font-size: 18px; font-weight: bold; }
.section-content { padding: 20px; background: #fafafa; }
@media (max-width: 768px) { .input-grid { grid-template-columns: 1fr; } .calc-header h2 { font-size: 22px; } .calc-container { padding: 10px; } }
/* Page-specific */
#cy { width: 100%; height: 500px; background: #f8faff; border-radius: 4px; }
.textarea-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-top: 16px; }
.detail-panel { background: #f0f8ff; border-left: 4px solid #4CAF50; padding: 14px; border-radius: 6px; font-size: 13px; min-height: 60px; }
.legend { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; font-size: 12px; }
.legend-item { display: flex; align-items: center; gap: 6px; }
.legend-dot { width: 14px; height: 14px; border-radius: 50%; flex-shrink: 0; }
.legend-line { width: 24px; height: 3px; flex-shrink: 0; }
code { background: #f0f0f0; padding: 1px 4px; border-radius: 3px; font-size: 12px; }
@media (max-width: 600px) { #cy { height: 360px; } }
</style>
<div class="calc-container">
<div class="calc-header">
<h2>เนมสเปซเครือข่าย Linux และ Visualizer</h2>
<p>วางเอาต์พุตคำสั่งผสมกัน — ทุกช่องจะเป็นตัวเลือก</p>
<div class="textarea-grid">
<div class="input-group">
<label>รายการ ip netns (ไม่บังคับ)</label>
<textarea id="nsInput" placeholder="default
ns1
ns2" rows="4"></textarea>
</div>
<div class="input-group">
<label>ลิงค์ไอพีแสดง</label>
<textarea id="linkInput" placeholder="1: lo: …
2: eth0: …" rows="4"></textarea>
</div>
<div class="input-group">
<label>แสดง ip addr (ไม่บังคับ)</label>
<textarea id="addrInput" placeholder="2: eth0: …
    inet 192.168.1.1/24 …" rows="4"></textarea>
</div>
</div>
<div class="button-container">
<button class="calc-button" onclick="render()">เรนเดอร์โทโพโลยี</button>
<button class="calc-button secondary" onclick="loadSample()">โหลดตัวอย่าง</button>
<button class="calc-button secondary" onclick="clearAll()">ชัดเจน</button>
</div>
</div>
<div class="result-section" id="cySection" style="display:none">
<div class="section-header">โทโพโลยีเนมสเปซ</div>
<div class="section-content" style="padding:12px">
<div class="legend">
<div class="legend-item"><div class="legend-dot" style="background:#0a3d62"></div>เนมสเปซ</div>
<div class="legend-item"><div class="legend-dot" style="background:#4facfe"></div>อินเตอร์เฟซ</div>
<div class="legend-item"><div class="legend-dot" style="background:#f7971e"></div>สะพาน</div>
<div class="legend-item"><div class="legend-dot" style="background:#28a745"></div>เนมสเปซเริ่มต้น</div>
<div class="legend-item"><div class="legend-line" style="background:#555"></div>ลิงก์คู่ Veth</div>
</div>
<div id="cy"></div>
<div class="detail-panel" id="detailPanel">คลิกโหนดเพื่อดูรายละเอียด</div>
</div>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/cytoscape/3.26.0/cytoscape.min.js"></script>
<script>
let cyInst = null;

function parseNetns(text) {
    const ns = ['root'];
    text.split('\n').forEach(line => {
        const m = line.match(/^(\S+)/);
        if (m && m[1]) ns.push(m[1]);
    });
    return [...new Set(ns)];
}

function parseLinks(text) {
    const links = [];
    text.split('\n').forEach(line => {
        // Match: N: name@peer: or N: name:
        const m = line.match(/^\d+:\s+([a-zA-Z0-9_.-]+)(?:@([a-zA-Z0-9_.-]+))?:/);
        if (m) {
            const [, name, peer] = m;
            const type = name.startsWith('br') ? 'bridge'
                : peer ? 'veth'
                : name === 'lo' ? 'lo'
                : 'eth';
            links.push({ name, peer: peer || null, type });
        }
    });
    return links;
}

function parseAddrs(text) {
    const addrs = {};
    let current = null;
    text.split('\n').forEach(line => {
        const ifMatch = line.match(/^\d+:\s+([a-zA-Z0-9_.-]+)(?:@\S+)?:/);
        if (ifMatch) { current = ifMatch[1]; addrs[current] = addrs[current] || []; }
        const ipMatch = line.match(/inet\s+(\d+\.\d+\.\d+\.\d+\/\d+)/);
        if (ipMatch && current) addrs[current].push(ipMatch[1]);
    });
    return addrs;
}

function render() {
    const nsText = document.getElementById('nsInput').value;
    const linkText = document.getElementById('linkInput').value;
    const addrText = document.getElementById('addrInput').value;

    const namespaces = parseNetns(nsText);
    const links = parseLinks(linkText);
    const addrs = parseAddrs(addrText);

    const elements = [];

    // Namespace nodes
    namespaces.forEach(ns => {
        elements.push({ data: { id: `ns_${ns}`, label: ns === 'root' ? 'root\nnamespace' : ns, type: 'ns', ns } });
    });

    // Interface nodes and veth pair edges
    const seenPairs = new Set();
    links.filter(l => l.type !== 'lo').forEach(l => {
        const iface = l.name;
        const ip = (addrs[iface] || []).join('\n') || '';
        const type = l.type;
        elements.push({ data: { id: `if_${iface}`, label: iface + (ip ? '\n' + ip : ''), type, ip } });

        // Connect interface to root namespace
        elements.push({ data: { id: `ns_root-${iface}`, source: 'ns_root', target: `if_${iface}` } });

        // veth pair edge
        if (l.peer && !seenPairs.has(`${l.peer}-${iface}`)) {
            seenPairs.add(`${iface}-${l.peer}`);
            elements.push({ data: { id: `veth_${iface}_${l.peer}`, source: `if_${iface}`, target: `if_${l.peer}`, type: 'veth-pair' } });
        }
    });

    document.getElementById('cySection').style.display = 'block';
    if (cyInst) { cyInst.destroy(); cyInst = null; }

    cyInst = cytoscape({
        container: document.getElementById('cy'),
        elements,
        style: [
            { selector: 'node[type="ns"]', style: {
                'label': 'data(label)', 'text-wrap': 'wrap',
                'shape': 'roundrectangle', 'width': 120, 'height': 50,
                'background-color': ele => ele.data('ns') === 'root' ? '#28a745' : '#0a3d62',
                'color': '#fff', 'font-size': 12, 'font-weight': 'bold',
                'text-valign': 'center', 'text-halign': 'center',
            }},
            { selector: 'node[type="veth"]', style: {
                'label': 'data(label)', 'text-wrap': 'wrap',
                'shape': 'ellipse', 'width': 100, 'height': 50,
                'background-color': '#4facfe', 'color': '#fff',
                'font-size': 10, 'text-valign': 'center', 'text-halign': 'center',
            }},
            { selector: 'node[type="bridge"]', style: {
                'label': 'data(label)', 'shape': 'diamond',
                'width': 90, 'height': 50,
                'background-color': '#f7971e', 'color': '#fff',
                'font-size': 11, 'text-valign': 'center', 'text-halign': 'center',
            }},
            { selector: 'node[type="eth"]', style: {
                'label': 'data(label)', 'text-wrap': 'wrap',
                'shape': 'roundrectangle', 'width': 100, 'height': 40,
                'background-color': '#6c757d', 'color': '#fff',
                'font-size': 10, 'text-valign': 'center', 'text-halign': 'center',
            }},
            { selector: 'edge', style: {
                'curve-style': 'bezier', 'line-color': '#555', 'width': 2,
                'target-arrow-shape': 'none',
            }},
            { selector: 'edge[type="veth-pair"]', style: {
                'line-color': '#4facfe', 'width': 3, 'line-style': 'dashed',
            }},
            { selector: 'node:selected', style: { 'border-width': 3, 'border-color': '#ffd200' }},
        ],
        layout: { name: 'cose', padding: 30 },
        userZoomingEnabled: true,
    });

    cyInst.on('tap', 'node', evt => {
        const d = evt.target.data();
        let html = `<strong>${d.label.replace(/\n/g, ' / ')}</strong><br>Type: ${d.type}`;
        if (d.ip) html += `<br>IPs: ${d.ip}`;
        document.getElementById('detailPanel').innerHTML = html;
    });
}

function loadSample() {
    document.getElementById('nsInput').value = 'red (id: 0)\nblue (id: 1)';
    document.getElementById('linkInput').value =
`1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
3: veth-red@veth-red-peer: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
4: veth-red-peer@veth-red: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
5: veth-blue@veth-blue-peer: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
6: veth-blue-peer@veth-blue: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500
7: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500`;
    document.getElementById('addrInput').value =
`3: veth-red@veth-red-peer: <BROADCAST>
    inet 10.0.1.1/24 scope global veth-red
4: veth-red-peer@veth-red: <BROADCAST>
    inet 10.0.1.2/24 scope global veth-red-peer
5: veth-blue@veth-blue-peer: <BROADCAST>
    inet 10.0.2.1/24 scope global veth-blue
6: veth-blue-peer@veth-blue: <BROADCAST>
    inet 10.0.2.2/24 scope global veth-blue-peer`;
    render();
}

function clearAll() {
    document.getElementById('nsInput').value = '';
    document.getElementById('linkInput').value = '';
    document.getElementById('addrInput').value = '';
    document.getElementById('cySection').style.display = 'none';
    if (cyInst) { cyInst.destroy(); cyInst = null; }
}
</script>