Q: Explain Docker networking modes.
- bridge (default) — container gets its own IP on a virtual network. Containers talk via bridge or by name (user-defined networks).
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🎙️ Candidate Opening & Architectural Context
""Container stability relies on clean signal handling (SIGTERM vs SIGKILL) and immutable image tagging. When addressing this question, I walk the interviewer through our production incident runbook: isolating the blast radius, checking diagnostic logs and metrics, and applying a safe fix.""
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🛠️ Production Runbook & Step-by-Step Resolution
1️⃣
Initial Diagnostics & Root Cause Analysis
bridge(default) — container gets its own IP on a virtual network. Containers talk via bridge or by name (user-defined networks).host— container shares the host's network namespace. No port mapping needed. Better performance. Less isolation.none— no networking. Completely isolated.
2️⃣
Remediation & Permanent Safeguards
Q21-Q60. Rapid-fire Docker Scenarios
overlay— for Docker Swarm. Connects containers across multiple hosts.macvlan— assigns a real MAC address from the host network. Container appears as a physical device on the network.
💡 The Senior SRE Gold Nugget (Key Architectural Takeaway)
"Pro-Tip: bridge (default) — container gets its own IP on a virtual network. Containers talk via bridge or by name (user-defined networks).."
⚡ 60-Second Elevator Pitch Talking Points
- bridge (default) — container gets its own IP on a virtual network. Containers talk via bridge or ...
- host — container shares the host's network namespace. No port mapping needed. Better performance....
- none — no networking. Completely isolated.
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