Docker Networking Explained: Connect Your Containers (2026)

🌐 Docker Networking Explained: Connect Your Containers (2026) Quick one-liner: Connect your containers to each other and the outside world. Learn bridge networks, port mapping, DNS, and container-to-container communication. 🤔 Why This Matters In the last post , you got Redis + RedisInsight working. Your data persisted across a version upgrade, your config was pre-loaded via bind mount, and your Redis data survived the container being deleted and recreated. But remember what happened when we tried to connect RedisInsight to Redis? # echo PING | nc dtredis86 6379 nc: bad address 'dtredis86' Hostname didn't resolve. We had to fall back to docker inspect to find the Redis IP ( 172.17.0.2 ) and connect that way. That works for a quick test, but it's not how you want to run anything real: 🏗️ If you restart the container, the IP changes 📋 You'd need to manually update configs every time 🔒 No network isolation — anything can reach anything 🌐 No way to access containers from your browser Today,