Understanding CMD and ENTRYPOINT in Dockerfiles
CMD and ENTRYPOINT both define what runs in a container but work differently — exec vs shell form, and how they interact when combined.
Tag: devops
All the articles with the tag "devops".
Copying Files Between Docker Containers and Host Machines
Use docker cp to move files between running containers and your host machine — no volumes needed for one-off file transfers.
Dockerfile: Differences Between COPY and ADD
COPY and ADD look similar but ADD auto-extracts tarballs and fetches URLs — know when each is appropriate and why COPY is usually better.
Docker Strategies for Load Balancing and Failover
Add load balancing and failover to your Docker setup using Swarm, nginx, HAProxy, and Keepalived — high availability without Kubernetes.
Docker Networking: Connecting to the Host from a Container
Access services on the host machine from inside a Docker container using host-gateway or host.docker.internal — no hardcoded IPs.
Understanding Docker vs. Full Virtual Machines (VMs)
Containers share the kernel; VMs have their own. Understand the isolation trade-offs, overhead differences, and when to use which.
Multiple Actions with a Single docker exec Call
Run multiple commands in one docker exec call using sh -c — pipe commands, chain with && or ;, and avoid repeated container roundtrips.
Executing Commands with Asterisks in Docker
Shell globbing breaks inside docker exec because of how args are parsed — here's how to pass wildcards and asterisks correctly.
Tmux for Streamlining Dev Workflow
tmux sessions, windows, and panes for developers — layouts, plugins, and the .tmux.conf that makes it feel like a proper IDE.
Ansible vs. Terraform: Cloud Infrastructure Management
Ansible configures servers; Terraform provisions infrastructure — learn when to use each, how they overlap, and why you probably need both.
WordPress, Docker, NGINX, and MySQL via Ansible
Automate a full WordPress stack deployment — Docker, nginx, and MySQL — using Ansible playbooks instead of clicking through wizards.
DevOps Tools: Ansible vs. Puppet vs. Salt vs. Chef
Ansible, Puppet, Salt, and Chef all do configuration management — but they're very different. Pick the right one before you commit.