The “docker secret” command is a Docker CLI command used to manage secrets in a Docker Swarm. Docker secrets are a secure way to manage sensitive information, such as passwords, API keys, and certificates, within a Docker Swarm cluster.
In a Docker Swarm, secrets are encrypted and stored securely, ensuring that only authorized services within the cluster can access them. Docker secrets are designed to be used by services, not by individual containers.
Here are some key aspects of the “docker secret” command:
1. Creating a secret: You can create a secret using the “docker secret create” command. You provide the secret data either as a file or as a string. For example, you can create a secret from a file using the following command:
# docker secret create my_secret /path/to/secret_file.txt
Alternatively, you can create a secret from a string using the “–secret” flag:
# echo "my_secret_data" | docker secret create my_secret -
2. Listing secrets: To see a list of all secrets in the Docker Swarm, you can use the “docker secret ls” command. It displays information such as the secret ID, name, and creation date for each secret.
3. Inspecting a secret: You can retrieve detailed information about a specific secret using the “docker secret inspect” command. This command provides information like the secret’s ID, name, and creation time, as well as the date of the last update.
4. Updating a secret: To update the value of a secret, you need to create a new secret with the updated value and then remove the old secret. This ensures that the secret value remains secure and is not exposed during updates.
5. Using secrets in services: Secrets can be used in services defined in a Docker Compose file or in a Docker service create command. Secrets are mounted as files in the containers running the service, allowing applications to access the secret data as needed.
6. Removing a secret: To remove a secret from the Docker Swarm, you can use the “docker secret rm” command, followed by the secret’s name or ID.
Docker secrets provide a secure way to manage sensitive information within a Docker Swarm, ensuring that secrets are encrypted and only accessible by authorized services. They enable you to separate sensitive data from application code, making it easier to manage and maintain secrets in a containerized environment.
docker secrete Command Examples
1. Create a new secret from stdin:
# command | docker secret create secret_name -
2. Create a new secret from a file:
# docker secret create secret_name /path/to/file
3. List all secrets:
# docker secret ls
4. Display detailed information on one or multiple secrets in a human friendly format:
# docker secret inspect --pretty secret_name1 secret_name2 ...
5. Remove one or more secrets:
# docker secret rm secret_name1 secret_name2 ...