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Credentials and other secrets from Vault to your containers at startup

№ 11183 В разделах: Programming Sysadmin от January 2nd, 2021,
В подшивках: Docker, Go, Kubernetes, Security, Vault

What if you stored your database credentials in Vault and want to make ENV variables with them for your application at container startup? You can do it for Kubernetes deployments or plain Docker containers with my small program vault-envs.

Add to your Dockerfile additional steps:

• install my vault-envs programs that “converts” secret to ENV variables
• create\modify entrypoint script where or call vault-envs and other pre-startup actions

Add to your Dockerfile steps:

...
...
# add Ubuntu\Debian repo and install vault-envs with fresh certificates
RUN curl http://deb.blindage.org/gpg-key.asc | apt-key add - && \
    echo "deb http://deb.blindage.org bionic main" | tee /etc/apt/sources.list.d/21h.list && \
    apt update
RUN apt install -y ca-certificates vault-envs

# copy entrypoint script
COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

ENTRYPOINT ["/entrypoint.sh"]

Your entrypoint script will look like:

#!/bin/bash

...
...

export eval `vault-envs -token "$VAULT_TOKEN" \
        -vault-url https://vault.blindage.org \
        -vault-path /prod/crm/connection_postgres -envs-prefix "PG_"`

export eval `vault-envs -token "$VAULT_TOKEN" \
        -vault-url https://vault.blindage.org \
        -vault-path /prod/crm/connection_mysql -envs-prefix "MYSQL_"`

export eval `vault-envs -token "$VAULT_TOKEN" \
        -vault-url https://vault.blindage.org \
        -vault-path /prod/crm/connection_api`

...
...

exec "$@"

If some vars names is identical they will be overwritten at next vault-envs call, so I used prefix.

Now build image and run

docker run --rm -e VAULT_TOKEN=s.QQmLlqnHnRAEO9eUeoggeK1n crm printenv

and see results at container console:

...
VAULT_RETRIEVER=vault-envs
PG_DB_PASS=postgres
PG_DB_PORT=5432
PG_DB_USER=postgres
PG_DB_HOST=db-postgres
PG_DB_NAME=crm
MYSQL_DB_HOST=mysql.wordpress
MYSQL_DB_PASS=
MYSQL_DB_PORT=3306
MYSQL_DB_USER=root
MYSQL_DB_NAME=wordpress
API_HOST=http://crm/api
API_TOKEN=giWroufpepfexHyentOnWebBydHojGhokEpAnyibnipNirryesaccasayls4
...

Wooh! You did it.

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