- 1 year ago
Access Gitlab CI variable during Docker build
To access GitLab CI variables during a Docker build, you can pass the variables as build arguments to the Docker build process. Here's how you can do it:
In your
.gitlab-ci.yml
file, define the CI variables that you want to pass to the Docker build process. For example:yamlvariables:
MY_VARIABLE: "my value"
In your Dockerfile, use the
ARG
instruction to define build arguments based on the CI variables. For example:DockerfileARG MY_VARIABLE
ENV MY_ENV=$MY_VARIABLE
# Rest of your Dockerfile
In the example above, the
MY_VARIABLE
CI variable is defined as a build argument (ARG
). It is then assigned to an environment variable (MY_ENV
) that can be used within the Dockerfile.In your GitLab CI job, pass the CI variables as build arguments during the Docker build process using the
--build-arg
flag. For example:yamlbuild:
image: docker:latest
script:
- docker build --build-arg MY_VARIABLE=$MY_VARIABLE -t myimage:latest .
# Rest of your GitLab CI configuration
In the example above, the
--build-arg
flag is used to pass the value of theMY_VARIABLE
CI variable to the Docker build process.
With this setup, the CI variable value is passed as a build argument to the Docker build process and can be accessed within the Dockerfile using the ARG
instruction. You can then use the value as needed within your Dockerfile, such as setting environment variables or configuring the build process.
Remember to adjust the variable names (MY_VARIABLE
in the example) and any other variables or configuration to match your specific requirements.
Note: Be cautious when passing sensitive information as build arguments, as they may be visible in the build logs or accessible within the Docker image. Consider using GitLab CI/CD secret variables or other secure methods for sensitive information.