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#docker

Everything tagged with docker across all content types.

5 posts

Troubleshooting

Fix GitLab CI "dial tcp: lookup docker" no such host error

The GitLab CI error "dial tcp lookup docker no such host" means the docker:dind service alias never resolved. Here is the fast fix and the real causes.

Warning · GitLab CI · dial tcp: lookup docker: no such host

Troubleshooting

GitLab CI "Cannot connect to unix:///var/run/docker.sock"

The GitLab CI error Cannot connect to the Docker daemon at unix:///var/run/docker.sock means DOCKER_HOST is unset. Here is the fast fix.

Warning · GitLab CI · unix:///var/run/docker.sock

Troubleshooting

Fix GitLab CI Docker daemon connection error in 3 steps

Fix the 'Cannot connect to the Docker daemon at' error in GitLab CI. Learn to add docker:dind service, set DOCKER_HOST, and enable privileged mode for reliable...

Docker Multi-Stage Builds: Smaller, Secure Production Images

Master Docker multi-stage builds to dramatically reduce image sizes, enhance security, and accelerate deployments for your production applications. Learn best pra...

docker · Apr 9, 2026 · 9 min read

Top 30 Kubernetes Interview Questions (2026)

Frequently asked Kubernetes interview questions covering pods, deployments, services, RBAC, and troubleshooting for mid to senior engineers.

Mid 30 questions