ced4568andClaude Sonnet 5
682ef2de47
Adds all 8 ROOT 04 modules (why containers exist, images & containers, Docker CLI, container networking, container storage, Dockerfile & image build, Docker Compose, containers → Kubernetes) — 43 activities, using the nested Docker Engine Phase 6D built and tested. Modules 1, 2, and 8 are conceptual (no lab by design) — the honest bridge module (M8) explicitly names what Kubernetes adds beyond what this course already taught, without re-teaching Kubernetes itself. Adds 5 new hands-on Docker scenarios plus 2 MCQs, all against the real nested Docker Engine: docker-cli-basics (run/exec/inspect a real container), docker-container-networking (a genuine "works internally, unreachable from host" port-publishing failure, diagnosed and fixed by recreating the container with the correct `-p` flag), docker-container-storage (a real destroy/recreate cycle proving named-volume persistence, not just described), docker-build-image (a real Dockerfile, a real build, a real custom image run), and docker-compose-multiservice (a real two-service Compose application with a real published port). All tested end-to-end via the real scenario-validation API, including negative tests. Wires rootnode-containers-assessment (2 required + 4 random-draw scenarios) using the existing Phase 3B assessment engine. This completes the entire ROOT_ Foundations sequence (ROOT 01-04) — see docs/PHASE6E_ROOT_FOUNDATIONS_COMPLETION.md. Co-Authored-By: Claude Sonnet 5 <[email protected]>
39 lines
2.8 KiB
JSON
39 lines
2.8 KiB
JSON
{
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"id": "docker-compose-multiservice",
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"title": "Run a Real Two-Service Application With Compose",
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"category": "Containers",
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"isolation_type": "shared_namespace",
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"difficulty": "Medium",
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"type": "task",
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"weight": 7,
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"description": "## Run a Real Two-Service Application With Compose\n\nManually running two related containers, wiring their network, and keeping track of dependency order gets tedious fast — Compose describes the whole application in one file.\n\n**Your task**, at `/srv/compose-lab/docker-compose.yml`:\n\n1. Define a `web` service from `nginx:alpine`, publishing host port `8077` to container port `80`\n2. Define an `api` service from `alpine:3.19`, running `sh -c 'echo api-ready > /tmp/ready && sleep 3600'`\n3. Make `web` depend on `api` (`depends_on`)\n4. Bring the whole application up with `docker compose up -d`\n5. Confirm both services are actually running, and that `curl http://localhost:8077/` succeeds",
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"hints": [
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{
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"title": "The compose file",
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"body": "A `services:` block defines each container as a named service — `ports` publishes a port exactly like `docker run -p`, `depends_on` controls startup order.",
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"command": "cat <<EOF > /srv/compose-lab/docker-compose.yml\nservices:\n web:\n image: nginx:alpine\n ports:\n - '8077:80'\n depends_on:\n - api\n api:\n image: alpine:3.19\n command: sh -c 'echo api-ready > /tmp/ready && sleep 3600'\nEOF"
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},
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{
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"title": "Bringing it up",
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"body": "`docker compose up -d` reads the compose file in the current directory (or use `-f` to point at one elsewhere) and starts every service defined in it.",
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"command": "cd /srv/compose-lab && docker compose up -d"
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}
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],
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"setup_commands": [
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{ "command": "rm -rf /srv/compose-lab && mkdir -p /srv/compose-lab" },
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{ "command": "docker pull nginx:alpine" },
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{ "command": "docker pull alpine:3.19" }
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],
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"validation": {
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"commands": [
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{ "description": "the web service is running", "command": "docker compose -f /srv/compose-lab/docker-compose.yml ps --format '{{.Service}}:{{.State}}' 2>/dev/null | grep web", "expected_output": "web:running", "match": "exact" },
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{ "description": "the api service is running", "command": "docker compose -f /srv/compose-lab/docker-compose.yml ps --format '{{.Service}}:{{.State}}' 2>/dev/null | grep api", "expected_output": "api:running", "match": "exact" },
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{ "description": "the published port actually works", "command": "curl -sf http://localhost:8077/ -o /dev/null -w '%{http_code}'", "expected_output": "200", "match": "exact" }
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]
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},
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"default_namespace": "default",
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"teardown_commands": [
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{ "command": "docker compose -f /srv/compose-lab/docker-compose.yml down 2>/dev/null; rm -rf /srv/compose-lab" }
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]
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}
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