🐳 Dockerized the project #164
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WalkthroughThis update introduces containerization and environment configuration for a Node.js application. It adds a Dockerfile with a multi-stage build, a docker-compose.yml for orchestrating the app and a PostgreSQL database, a .dockerignore to exclude unnecessary files from the build context, and updates .env.example with port variables. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Docker Compose
participant App Container
participant DB Container
User->>Docker Compose: docker-compose up
Docker Compose->>DB Container: Start PostgreSQL service
Docker Compose->>App Container: Build and start Node.js app
App Container->>DB Container: Connect via DATABASE_URL
User->>App Container: Access app via exposed PORT (3000)
Estimated code review effort2 (~15 minutes) Poem
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Actionable comments posted: 5
🧹 Nitpick comments (3)
.env.example (1)
2-3: Add a trailing newline and keep keys ordered for readability.Minor, but
.envlinters (and many editors) expect a terminating newline and often prefer alphabetical ordering for fast diffing.POLAR_API_BASE_URL=https://api.polar.sh/v1 -DB_PORT=5432 -PORT=3000 +DB_PORT=5432 +PORT=3000 +.dockerignore (1)
3-3: Consider keepingDockerfilein the context.Ignoring
Dockerfileis harmless but unusual; it can confuse newcomers and tooling that inspects build context.
If you don’t have a strong reason, drop the line.-Dockerfiledocker-compose.yml (1)
29-29: Add a trailing newline for POSIX compliance.YAML linters flag this; keeps diffs cleaner.
db_data: +
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⛔ Files ignored due to path filters (1)
package-lock.jsonis excluded by!**/package-lock.json
📒 Files selected for processing (4)
.dockerignore(1 hunks).env.example(1 hunks)Dockerfile(1 hunks)docker-compose.yml(1 hunks)
🪛 dotenv-linter (3.3.0)
.env.example
[warning] 2-2: [UnorderedKey] The DB_PORT key should go before the POLAR_API_BASE_URL key
[warning] 3-3: [EndingBlankLine] No blank line at the end of the file
🪛 Checkov (3.2.334)
docker-compose.yml
[MEDIUM] 21-22: Basic Auth Credentials
(CKV_SECRET_4)
🪛 YAMLlint (1.37.1)
docker-compose.yml
[error] 29-29: no new line character at the end of file
(new-line-at-end-of-file)
🧰 Additional context used
🪛 dotenv-linter (3.3.0)
.env.example
[warning] 2-2: [UnorderedKey] The DB_PORT key should go before the POLAR_API_BASE_URL key
[warning] 3-3: [EndingBlankLine] No blank line at the end of the file
🪛 Checkov (3.2.334)
docker-compose.yml
[MEDIUM] 21-22: Basic Auth Credentials
(CKV_SECRET_4)
🪛 YAMLlint (1.37.1)
docker-compose.yml
[error] 29-29: no new line character at the end of file
(new-line-at-end-of-file)
| @@ -0,0 +1,7 @@ | |||
| node_modules | |||
| pnpm-lock.yaml | |||
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pnpm-lock.yaml must NOT be ignored – build will break.
The Dockerfile explicitly copies the lock-file:
COPY package.json pnpm-lock.yaml ./
With the current ignore rule Docker won’t send pnpm-lock.yaml to the build context, so the COPY step fails.
-node_modules
-pnpm-lock.yaml
+node_modules
# keep the lock-file for reproducible builds🤖 Prompt for AI Agents
In the .dockerignore file at line 2, remove the entry "pnpm-lock.yaml" to ensure
this lock file is included in the Docker build context. This is necessary
because the Dockerfile explicitly copies pnpm-lock.yaml, and ignoring it causes
the build to fail. Simply delete or comment out this line to fix the issue.
| environment: | ||
| POSTGRES_USER: postgres | ||
| POSTGRES_PASSWORD: postgres | ||
| POSTGRES_DB: laminarflow |
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🛠️ Refactor suggestion
Avoid hard-coding database credentials in version-controlled compose files.
Expose them via an external .env or Docker secrets to reduce accidental leaks and make prod/dev variance easier.
🤖 Prompt for AI Agents
In docker-compose.yml lines 7 to 10, the database credentials are hard-coded
under environment variables. To fix this, remove the hard-coded values and
instead reference environment variables defined in an external .env file or use
Docker secrets. Update the compose file to use variable substitution like
${POSTGRES_USER}, ${POSTGRES_PASSWORD}, and ${POSTGRES_DB} so credentials are
not stored directly in version control and can vary by environment.
| DATABASE_URL: postgres://postgres:postgres@db:${DB_PORT:-5432}/laminarflow | ||
| NODE_ENV: production |
There was a problem hiding this comment.
Quote the DATABASE_URL to ensure correct variable expansion and YAML parsing.
Colons in unquoted scalars and the ${VAR:-default} expression can lead to subtle parse/expansion issues.
- DATABASE_URL: postgres://postgres:postgres@db:${DB_PORT:-5432}/laminarflow
+ DATABASE_URL: "postgres://postgres:postgres@db:${DB_PORT:-5432}/laminarflow"🧰 Tools
🪛 Checkov (3.2.334)
[MEDIUM] 21-22: Basic Auth Credentials
(CKV_SECRET_4)
🤖 Prompt for AI Agents
In docker-compose.yml around lines 21 to 22, the DATABASE_URL value contains
colons and a variable expansion expression that can cause YAML parsing issues.
To fix this, enclose the entire DATABASE_URL string in double quotes to ensure
correct variable expansion and proper YAML parsing.
| FROM node:20-alpine AS prod | ||
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| WORKDIR /app | ||
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| ENV NODE_ENV=production | ||
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| COPY --from=base /app ./ | ||
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| EXPOSE 3000 | ||
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| CMD ["pnpm", "start"] No newline at end of file |
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pnpm is missing in the final image – container will not start.
pnpm is installed globally in the base stage, but only /app is copied to prod.
/usr/local/bin/pnpm (and its global store) stay behind, so CMD ["pnpm", "start"] fails.
FROM node:20-alpine AS prod
WORKDIR /app
ENV NODE_ENV=production
-COPY --from=base /app ./
+# Install pnpm again (tiny) or switch to `npm start`
+RUN npm install -g pnpm
+COPY --from=base /app ./Alternatively change CMD to ["npm", "start"] after adding a --production install step.
🤖 Prompt for AI Agents
In Dockerfile lines 21 to 31, the final prod image lacks the globally installed
pnpm binary because only the /app directory is copied from the base stage,
causing the CMD ["pnpm", "start"] to fail. To fix this, either copy the pnpm
binary and its global store from the base stage into the prod image or replace
the CMD with ["npm", "start"] and add a step to run npm install with the
--production flag in the prod stage to ensure dependencies are installed without
relying on pnpm.
| ENV NODE_ENV=production | ||
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| COPY --from=base /app ./ | ||
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🛠️ Refactor suggestion
Prune dev-dependencies to slim the production image.
The current flow copies node_modules containing dev deps.
After copying, run pnpm prune --prod (or pnpm install --prod) before the final image is cut.
🤖 Prompt for AI Agents
In Dockerfile around lines 25 to 28, the production image includes dev
dependencies because node_modules is copied as-is. To fix this, after copying
the application files from the base image, run `pnpm prune --prod` or `pnpm
install --prod` to remove dev dependencies and slim down the final production
image.
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since this PR was created, there have been several updates to the repo and codebase. |
2 participants
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