DevOps & Git · Week 3

Debug: site down — isolate DNS vs port vs app

01 / 13Present00:00

DevOps & Git • Week 3

01 / 13

Debug: site down — isolate DNS vs port vs app

Most 'the deploy is broken' tickets are DNS, ports or TLS.

StackShade deck

Predict → explain → retrieve

COURSE CONTENTS

Debug: site down — isolate DNS vs port vs app

01Git MasteryWeek 1 · 5 topics0/5

Git internals: blobs, trees, commits — the object graph14 min Branching strategies: trunk-based vs GitFlow12 min rebase -i, cherry-pick, reset (soft/mixed/hard)16 min Interactive: disaster recovery with reflog12 min Rescue lab: recover a 'lost' commit + fix a bad rebase30 min

02GitHub Workflow & Code ReviewWeek 1–2 · 5 topics0/5

PR hygiene: size, descriptions, stacked diffs12 min Code review culture: what to catch, what to automate12 min Branch protection, semantic commits, changelogs12 min Monorepos vs polyrepos: tooling implications10 min Set up a protected main + PR template repo30 min

03Linux & Shell FluencyWeek 2–3 · 5 topics0/5

Filesystem, permissions, users, sudo14 min Processes, signals, systemd services14 min Pipes, redirection, grep/sed/awk survival kit16 min Interactive: build pipelines to answer log questions15 min Write a deploy script with set -euo pipefail30 min

04Networking for DevOpsWeek 3 · 5 topics0/5

OSI refresher for infra debugging15 min Ports, firewalls, security groups12 min DNS records that matter: A, CNAME, MX, TXT, TTL12 min nginx as reverse proxy + TLS termination14 min Debug: site down — isolate DNS vs port vs app30 min

05CI/CD PipelinesWeek 4 · 5 topics0/5

Pipeline anatomy: stages, artifacts, caching14 min GitHub Actions: workflows, jobs, matrix, secrets16 min Deploy strategies: rolling, blue-green, canary14 min Interactive: pick a deploy strategy for 5 risk profiles12 min Build a full pipeline: test → build → canary deploy60 min

06Docker & ContainersWeek 5–6 · 5 topics0/5

Containers vs VMs; namespaces + cgroups under the hood14 min Dockerfiles that don't suck: layers, caching, multi-stage16 min Volumes, networks, docker compose for local stacks14 min Interactive: shrink a 1.2GB image to 80MB15 min Containerize a 3-tier app (web + api + db)45 min

07KubernetesWeek 6–7 · 6 topics0/6

Cluster anatomy: control plane vs nodes14 min Pods, Deployments, Services, Ingress16 min ConfigMaps, Secrets, probes and resource limits14 min Rolling updates, rollbacks, autoscaling (HPA)14 min Interactive: kill a pod, watch self-healing12 min Deploy the 3-tier app to a local cluster (kind/minikube)60 min

08Cloud, IaC & ObservabilityWeek 8 · 6 topics0/6

Cloud primitives: compute, object storage, VPC, IAM16 min Terraform: plan/apply, state, modules16 min The three pillars: logs, metrics, traces14 min Prometheus + Grafana + alerting that doesn't cry wolf14 min SLOs, error budgets and incident response basics12 min CAPSTONE: IaC-provisioned, monitored, canary-deployed app2–3 days