ceph-authtool
ceph-authtool is a utility used to manage Ceph authentication keys and credentials. This tool helps create, view, and modify Ceph authentication keys, which are essential for managing access control in a Ceph cluster. Ceph uses a Public Key Infrastructure (PKI)-like system to authenticate various entities such as monitors, OSDs, and clients.
Common ceph-authtool Commands and Subcommands
ceph-authtool Commands and Subcommands1. Create a New Keyring
Creates a new Ceph keyring file.
Example:
This command creates a new keyring file called ceph.client.admin.keyring that will be used for storing the admin key for Ceph.
2. Generate a New Key
Generates a new key and adds it to a keyring.
Example:
This command generates a new authentication key for the entity client.admin and stores it in the specified keyring file.
3. Import Keys
Imports a key from one keyring to another keyring.
Example:
This command imports the keys from temp-keyring into the admin keyring.
4. View a Keyring
Prints the details of a keyring, including the entities and their keys.
Example:
This command prints out the content of the keyring, including the key for the client.admin.
5. Add a New Key to Keyring
Adds an existing key for a specific entity to the keyring.
Example:
This adds the provided authentication key (AQABCF...==) for client.admin into the specified keyring.
6. Remove a Key from a Keyring
Removes a specific entity's key from a keyring.
Example:
This removes the client.admin entity from the specified keyring.
7. Change the Permissions of a Key
Sets or modifies the capabilities of an entity in the keyring.
Example:
This command sets the capabilities of client.admin to have full access to both monitors and OSDs.
8. Extract a Key to a File
Extracts the key for a specific entity and saves it to a file.
Example:
This extracts the key for client.admin and saves it to the file /tmp/client.admin.key.
9. Convert Keyring Format
Converts a keyring from one format to another.
Example:
This converts the keyring to a base64-encoded format.
Typical Use Cases:
Creating and Managing Client Authentication: To manage client authentication in a Ceph cluster,
ceph-authtoolis used to create, add, and modify the keys stored in keyrings, ensuring secure access to cluster resources.Cluster Authentication: Ceph components (e.g., monitors, OSDs) require keyrings to authenticate with each other. Using
ceph-authtool, you can generate and manage these keys effectively.Backup of Keyrings: Administrators can use
ceph-authtoolto print keys and store them in separate files for backup or migration purposes.
Conclusion
ceph-authtool is an essential command-line tool for managing Ceph authentication keys. It allows administrators to create, modify, and manage keyrings for various entities like clients, OSDs, and monitors, ensuring secure and proper access control within the Ceph cluster.
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