WEX Fintech Devops Engineer Interview Questions, Process, and Tips

A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image.

• Use 'FROM' to specify the base image

• Use 'RUN' to execute commands in the container

• Use 'COPY' to copy files from the host to the container

• Use 'CMD' to specify the command to run when the container starts

• Use 'EXPOSE' to expose ports

• Use 'WORKDIR' to set the working directory

• Use 'ENV' to set environment

A Docker image is a lightweight, standalone, executable package that includes everything needed to run a piece of software.

• Docker images are built using a Dockerfile, which specifies the environment and dependencies needed for the software to run.

• Images can be stored in a registry like Docker Hub and pulled down to run on any Docker-enabled machine.

• Each image consists of layers that are stacked on top of each other, al...read more

Some other Continuous Integration tools include GitLab CI/CD, CircleCI, Travis CI, TeamCity, Bamboo, and Azure DevOps.

• GitLab CI/CD is a popular tool that integrates with GitLab for CI/CD pipelines.

• CircleCI is a cloud-based CI/CD tool that supports various programming languages and frameworks.

• Travis CI is a CI/CD tool that is commonly used for open source projects hosted on GitHub.

• TeamCity is a CI/CD tool by JetBrains t...read more

To create a dashboard and set up alerts in Grafana or AppDynamics, you can use the following steps:

• 1. Log in to Grafana or AppDynamics and navigate to the dashboard section.

• 2. Click on 'Create Dashboard' and choose the type of visualization you want to add (e.g. graph, table, gauge).

• 3. Configure the data source for your dashboard (e.g. Prometheus, InfluxDB, AppDynamics).

• 4. Add panels to your dashboard by selecting the ...read more

I handle production deployments by following a structured process and utilizing automation tools.

• I create deployment pipelines using tools like Jenkins or GitLab CI/CD.

• I conduct thorough testing in staging environments before deploying to production.

• I use configuration management tools like Ansible or Puppet to ensure consistency across environments.

• I monitor deployments closely and have rollback strategies in place in...read more

Blue-green deployment is a deployment strategy where two identical production environments are maintained, allowing for seamless updates.

• Two identical production environments are maintained - blue and green.

• One environment (blue) serves as the active production environment while the other (green) is idle.

• Updates are deployed to the idle environment (green) and then traffic is switched to it once the update is successfu...read more