In order to access your cloud, Juju will need to know how to authenticate itself. We use the term credentials to describe the tokens or keys or secrets used - a set of credentials is represented by a credential name that is used to refer to those credentials in subsequent commands.
Juju selects a credential according to how many credentials are defined. If you have only one credential, or if a credential is labelled 'default', then this is the credential that will be used by Juju. When multiple credentials are defined, with no default, a credential name must be specified at the model level.
Juju can import your cloud credentials in one of three ways:
- Accepting credentials provided interactively by the user on the command line
- Scanning for existing credentials (e.g. environment variables, "rc" files)
- Reading a user-provided YAML-formatted file
Each of these methods are explained below, but if you are still having difficulty you can get extra help by selecting your cloud from among this list:
Note: LXD deployments are a special case. Accessed locally, they do not require credentials. Accessed remotely, they need a certificate credential. See Using LXD as a cloud for further details.
You can add credentials by running the command:
juju add-credential <cloud>
Juju will then ask for the information it needs. This may vary according to the cloud you are using, but will typically look something like this:
Enter credential name: carol Using auth-type "access-key". Enter access-key: ******* Enter secret-key: ******* Credentials added for cloud aws.
Once you have supplied all the information, the credentials will be added.
At present, you will need to manually set one to be the default, if you have more than one for a cloud:
juju set-default-credential <cloud> <credential>
Setting a default credential means this will be used by the bootstrap
command when creating a controller, without having to specify it with
--credential option in the
juju add-model command.
Some cloud providers (e.g. AWS, OpenStack) have command line tools which rely on environment variables being used to store credentials. If these are in use on your system already, or you choose to define them ([there is extra info here][env]), Juju can import them.
For example, AWS uses the following environment variables (among others):
If these are already set in your shell (you can echo $AWS_ACCESS_KEY_ID to test) they can be used by Juju.
To scan your system for credentials Juju can use, run the command:
This will will ask you whether to store each set of credentials it finds. Note that this is a 'snapshot' of those stored values - Juju will not notice if they change in future.
You can also specify a YAML format file for the credentials. This file would be similar to, but shorter than this extensive sample, which we will call mycreds.yaml:
credentials: aws: default-credential: peter default-region: us-west-2 peter: auth-type: access-key access-key: AKIAIH7SUFMBP455BSQ secret-key: HEg5Y1DuGabiLt72LyCLkKnOw+NZkgszh3qIZbWv paul: auth-type: access-key access-key: KAZHUKJHE33P455BSQB secret-key: WXg6S5Y1DvwuGt72LwzLKnItt+GRwlkn668sXHqq homemaas: peter: auth-type: oauth1 maas-oauth: 5weWAsjhe9lnaLKHERNSlke320ah9naldIHnrelks homestack: default-region: region-a peter: auth-type: userpass password: UberPassK3yz tenant-name: appserver username: peter google: peter: auth-type: jsonfile file: ~/.config/gcloud/application_default_credentials.json azure: peter: auth-type: service-principal-secret application-id: niftyapp subscription-id: 31fb132e-e774-49dd-adbb-d6a4e966c583 application-password: UberPassK3yz joyent: peter: auth-type: userpass sdc-user: admingal sdc-key-id: 2048 00:11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff private-key: key (or private-key-path, like `~/.ssh/id_rsa.pub`) algorithm: "rsa-sha256" vsphere: ashley: auth-type: userpass password: passw0rd user: email@example.com
A source file like the above can be added to Juju's list of credentials with the command:
juju add-credential aws -f mycreds.yaml
This sample includes all of the default cloud options plus a couple of
special cloud options, MAAS and an OpenStack cloud called
the sample. See Clouds.
There are several management tasks that can be done related to credentials.
You can check what credentials are stored by Juju by running the command:
...which will return a list of the known credentials. For example:
Cloud Credentials aws bob*, carol google wayne
The asterisk '*' denotes the default credential, which will be used for the named cloud unless another is specified.
For YAML output that includes detailed credential information, including secrets like access keys and passwords:
juju credentials --format yaml --show-secrets
The YAML output will be similar to our 'mycreds.yaml' sample above.
You can set the default credential for a cloud:
juju set-default-credential aws carol
- This affects operations that require a newly-input credential (e.g.
juju add-model). In particular, it does not change what is currently in use (on a controller).
- If only one credential name exists, it will become the effective default credential.
To update an existing credential locally use the
add-credential command with
Here we decided to use the file 'mycreds.yaml' from a previous example:
juju add-credential aws -f mycreds.yaml --replace
This will overwrite existing credential information, so make sure all current credentials are contained in the file, not just the new or changed one.
Updating credentials in this way does not update credentials currently in use
(on an existing controller/cloud). See the next section for that. The
add-credential command is always "pre-bootstrap" in nature.
To update credentials currently in use (i.e. cached on the controller) the
update-credential command is used. The requirements for using this command,
as compared to the initial
juju bootstrap (or
juju add-model) command, are:
- same cloud name
- same Juju username (logged in)
- same credential name
The update is a two-step process. First change the credentials locally with the
add-credential command (in conjunction with the
--replace option) and then
upload those credentials to the controller.
Below, we explicitly log in with the correct Juju username ('admin'), change the contents of the credential called 'joe', and then update them on a Google cloud controller:
juju login -u admin juju add-credential --replace joe juju update-credential google joe
Warning: It is not possible to update the credentials if the initial credential name is unknown. This restriction will be removed in an upcoming release of Juju.
If you are unable to ascertain the original Juju username then you will need to use a different one. This implies adding a new credential name, copying over any authentication material into the old credential name, and finally updating the credentials. Below we demonstrate this for the Azure cloud:
Add a new temporary credential name (like 'new-credential-name') and gather all credential sets (new and old):
juju add-credential azure juju credentials azure --format yaml --show-secrets > azure-creds.yaml
Copy the values of
application-password from the new set
to the old set.
Then replace the local credentials and upload them to the controller:
juju add-credential azure -f azure-creds.yaml --replace juju update-credential azure old-credential-name
To be clear, the file
azure-creds.yaml (used with
look similar to:
Credentials: azure: new-credential-name: auth-type: service-principal-secret application-id: foo1 application-password: foo2 subscription-id: bar old-credential-name: auth-type: service-principal-secret application-id: foo1 application-password: foo2 subscription-id: bar
If a local credential (i.e. not cached on a controller) is no longer required, it can be removed:
juju remove-credential aws bob