31 lines
724 B
Markdown
31 lines
724 B
Markdown
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---
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tags:
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- docker
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---
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The `entrypoint` key in a Docker compose file is useful for running any advanced
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scripts before the the main `cmd` is executed.
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```sh
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app:
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image: python:3.11-slim
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entrypoint: ["./entrypoint.sh"]
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command: ["python", "src/app.py"]
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```
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I used it recently to inject a `.pem` certificate into the container before the
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main execution.
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The script must conclude with `exec "$@"` because it receives the value of the
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`command` key in the Compose file as its argument. E.g.
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```sh
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cat /etc/ssl/certs/ca-certificates.crt /zscaler.pem > /tmp/combined-certs.pem
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export REQUESTS_CA_BUNDLE=/tmp/combined-certs.pem
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export SSL_CERT_FILE=/tmp/combined-certs.pem
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pip install -r requirements.txt
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exec "$@"
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```
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