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Code Editor : config-vars.rst
:title: AWS CLI Configuration Variables :description: Configuration Variables for the AWS CLI :category: General :related command: configure, configure get, configure set :related topic: s3-config Configuration values for the AWS CLI can come from several sources: * As a command line option * As an environment variable * As a value in the AWS CLI config file * As a value in the AWS Shared Credential file Some options are only available in the AWS CLI config. This topic guide covers all the configuration variables available in the AWS CLI. Note that if you are just looking to get the minimum required configuration to run the AWS CLI, we recommend running ``aws configure``, which will prompt you for the necessary configuration values. Config File Format ================== The AWS CLI config file, which defaults to ``~/.aws/config`` has the following format:: [default] aws_access_key_id=foo aws_secret_access_key=bar region=us-west-2 The ``default`` section refers to the configuration values for the default profile. You can create profiles, which represent logical groups of configuration. Profiles that aren't the default profile are specified by creating a section titled "profile profilename":: [profile testing] aws_access_key_id=foo aws_secret_access_key=bar region=us-west-2 Nested Values ------------- Some service specific configuration, discussed in more detail below, has a single top level key, with nested sub values. These sub values are denoted by indentation:: [profile testing] aws_access_key_id = foo aws_secret_access_key = bar region = us-west-2 s3 = max_concurrent_requests=10 max_queue_size=1000 General Options =============== The AWS CLI has a few general options: ==================== =========== ===================== ===================== ============================ Variable Option Config Entry Environment Variable Description ==================== =========== ===================== ===================== ============================ profile --profile N/A AWS_PROFILE Default profile name -------------------- ----------- --------------------- --------------------- ---------------------------- region --region region AWS_DEFAULT_REGION Default AWS Region -------------------- ----------- --------------------- --------------------- ---------------------------- output --output output AWS_DEFAULT_OUTPUT Default output style -------------------- ----------- --------------------- --------------------- ---------------------------- cli_timestamp_format N/A cli_timestamp_format N/A Output format of timestamps -------------------- ----------- --------------------- --------------------- ---------------------------- cli_follow_urlparam N/A cli_follow_urlparam N/A Fetch URL url parameters -------------------- ----------- --------------------- --------------------- ---------------------------- ca_bundle --ca-bundle ca_bundle AWS_CA_BUNDLE CA Certificate Bundle -------------------- ----------- --------------------- --------------------- ---------------------------- parameter_validation N/A parameter_validation N/A Toggles parameter validation -------------------- ----------- --------------------- --------------------- ---------------------------- tcp_keepalive N/A tcp_keepalive N/A Toggles TCP Keep-Alive -------------------- ----------- --------------------- --------------------- ---------------------------- max_attempts N/A max_attempts AWS_MAX_ATTEMPTS Number of total requests -------------------- ----------- --------------------- --------------------- ---------------------------- retry_mode N/A retry_mode AWS_RETRY_MODE Type of retries performed ==================== =========== ===================== ===================== ============================ The third column, Config Entry, is the value you would specify in the AWS CLI config file. By default, this location is ``~/.aws/config``. If you need to change this value, you can set the ``AWS_CONFIG_FILE`` environment variable to change this location. The valid values of the ``output`` configuration variable are: * json * table * text ``cli_timestamp_format`` controls the format of timestamps displayed by the AWS CLI. The valid values of the ``cli_timestamp_format`` configuration variable are: * none - Display the timestamp exactly as received from the HTTP response. * iso8601 - Reformat timestamp using iso8601 in the UTC timezone. ``cli_follow_urlparam`` controls whether or not the CLI will attempt to follow URL links in parameters that start with either prefix ``https://`` or ``http://``. The valid values of the ``cli_follow_urlparam`` configuration variable are: * true - This is the default value. With this configured the CLI will follow any string parameters that start with ``https://`` or ``http://`` will be fetched, and the downloaded content will be used as the parameter instead. * false - The CLI will not treat strings prefixed with ``https://`` or ``http://`` any differently than normal string parameters. ``parameter_validation`` controls whether parameter validation should occur when serializing requests. The default is True. You can disable parameter validation for performance reasons. Otherwise, it's recommended to leave parameter validation enabled. The ``max_attempts`` and ``retry_mode`` are explained in the "Retry Configuration" section below. When you specify a profile, either using ``--profile profile-name`` or by setting a value for the ``AWS_PROFILE`` environment variable, profile name you provide is used to find the corresponding section in the AWS CLI config file. For example, specifying ``--profile development`` will instruct the AWS CLI to look for a section in the AWS CLI config file of ``[profile development]``. Precedence ---------- The above configuration values have the following precedence: * Command line options * Environment variables * Configuration file Credentials =========== Credentials can be specified in several ways: * Environment variables * The AWS Shared Credential File * The AWS CLI config file ============================= ============================= ================================= ============================== Variable Creds/Config Entry Environment Variable Description ============================= ============================= ================================= ============================== access_key aws_access_key_id AWS_ACCESS_KEY_ID AWS Access Key ----------------------------- ----------------------------- --------------------------------- ------------------------------ secret_key aws_secret_access_key AWS_SECRET_ACCESS_KEY AWS Secret Key ----------------------------- ----------------------------- --------------------------------- ------------------------------ token aws_session_token AWS_SESSION_TOKEN AWS Token (temp credentials) ----------------------------- ----------------------------- --------------------------------- ------------------------------ metadata_service_timeout metadata_service_timeout AWS_METADATA_SERVICE_TIMEOUT EC2 metadata creds timeout ----------------------------- ----------------------------- --------------------------------- ------------------------------ metadata_service_num_attempts metadata_service_num_attempts AWS_METADATA_SERVICE_NUM_ATTEMPTS EC2 metadata creds retry count ============================= ============================= ================================= ============================== The second column specifies the name that you can specify in either the AWS CLI config file or the AWS Shared credentials file (``~/.aws/credentials``). The Shared Credentials File --------------------------- The shared credentials file has a default location of ``~/.aws/credentials``. You can change the location of the shared credentials file by setting the ``AWS_SHARED_CREDENTIALS_FILE`` environment variable. This file is an INI formatted file with section names corresponding to profiles. With each section, the three configuration variables shown above can be specified: ``aws_access_key_id``, ``aws_secret_access_key``, ``aws_session_token``. **These are the only supported values in the shared credential file.** Also note that the section names are different than the AWS CLI config file (``~/.aws/config``). In the AWS CLI config file, you create a new profile by creating a section of ``[profile profile-name]``, for example:: [profile development] aws_access_key_id=foo aws_secret_access_key=bar In the shared credentials file, profiles are not prefixed with ``profile``, for example:: [development] aws_access_key_id=foo aws_secret_access_key=bar Precedence ---------- Credentials from environment variables have precedence over credentials from the shared credentials and AWS CLI config file. Credentials specified in the shared credentials file have precedence over credentials in the AWS CLI config file. If ``AWS_PROFILE`` environment variable is set and the ``AWS_ACCESS_KEY_ID`` and ``AWS_SECRET_ACCESS_KEY`` environment variables are set, then the credentials provided by ``AWS_ACCESS_KEY_ID`` and ``AWS_SECRET_ACCESS_KEY`` will override the credentials located in the profile provided by ``AWS_PROFILE``. Using AWS IAM Roles ------------------- If you are on an Amazon EC2 instance that was launched with an IAM role, the AWS CLI will automatically retrieve credentials for you. You do not need to configure any credentials. Additionally, you can specify a role for the AWS CLI to assume, and the AWS CLI will automatically make the corresponding ``AssumeRole`` calls for you. Note that configuration variables for using IAM roles can only be in the AWS CLI config file. You can specify the following configuration values for configuring an IAM role in the AWS CLI config file: * ``role_arn`` - The ARN of the role you want to assume. * ``source_profile`` - The AWS CLI profile that contains credentials / configuration the CLI should use for the initial ``assume-role`` call. This profile may be another profile configured to use ``assume-role``, though if static credentials are present in the profile they will take precedence. This parameter cannot be provided alongside ``credential_source``. * ``credential_source`` - The credential provider to use to get credentials for the initial ``assume-role`` call. This parameter cannot be provided alongside ``source_profile``. Valid values are: * ``Environment`` to pull source credentials from environment variables. * ``Ec2InstanceMetadata`` to use the EC2 instance role as source credentials. * ``EcsContainer`` to use the ECS container credentials as the source credentials. * ``external_id`` - A unique identifier that is used by third parties to assume a role in their customers' accounts. This maps to the ``ExternalId`` parameter in the ``AssumeRole`` operation. This is an optional parameter. * ``mfa_serial`` - The identification number of the MFA device to use when assuming a role. This is an optional parameter. Specify this value if the trust policy of the role being assumed includes a condition that requires MFA authentication. The value is either the serial number for a hardware device (such as GAHT12345678) or an Amazon Resource Name (ARN) for a virtual device (such as arn:aws:iam::123456789012:mfa/user). * ``role_session_name`` - The name applied to this assume-role session. This value affects the assumed role user ARN (such as arn:aws:sts::123456789012:assumed-role/role_name/role_session_name). This maps to the ``RoleSessionName`` parameter in the ``AssumeRole`` operation. This is an optional parameter. If you do not provide this value, a session name will be automatically generated. * ``duration_seconds`` - The duration, in seconds, of the role session. The value can range from 900 seconds (15 minutes) up to the maximum session duration setting for the role. This is an optional parameter and by default, the value is set to 3600 seconds. If you do not have MFA authentication required, then you only need to specify a ``role_arn`` and either a ``source_profile`` or a ``credential_source``. When you specify a profile that has IAM role configuration, the AWS CLI will make an ``AssumeRole`` call to retrieve temporary credentials. These credentials are then stored (in ``~/.aws/cli/cache``). Subsequent AWS CLI commands will use the cached temporary credentials until they expire, in which case the AWS CLI will automatically refresh credentials. If you specify an ``mfa_serial``, then the first time an ``AssumeRole`` call is made, you will be prompted to enter the MFA code. Subsequent commands will use the cached temporary credentials. However, when the temporary credentials expire, you will be re-prompted for another MFA code. Example configuration using ``source_profile``:: # In ~/.aws/credentials: [development] aws_access_key_id=foo aws_secret_access_key=bar # In ~/.aws/config [profile crossaccount] role_arn=arn:aws:iam:... source_profile=development Example configuration using ``credential_source`` to use the instance role as the source credentials for the assume role call:: # In ~/.aws/config [profile crossaccount] role_arn=arn:aws:iam:... credential_source=Ec2InstanceMetadata Assume Role With Web Identity -------------------------------------- Within the ``~/.aws/config`` file, you can also configure a profile to indicate that the AWS CLI should assume a role. When you do this, the AWS CLI will automatically make the corresponding ``AssumeRoleWithWebIdentity`` calls to AWS STS on your behalf. When you specify a profile that has IAM role configuration, the AWS CLI will make an ``AssumeRoleWithWebIdentity`` call to retrieve temporary credentials. These credentials are then stored (in ``~/.aws/cli/cache``). Subsequent AWS CLI commands will use the cached temporary credentials until they expire, in which case the AWS CLI will automatically refresh credentials. You can specify the following configuration values for configuring an assume role with web identity profile in the shared config: * ``role_arn`` - The ARN of the role you want to assume. * ``web_identity_token_file`` - The path to a file which contains an OAuth 2.0 access token or OpenID Connect ID token that is provided by the identity provider. The contents of this file will be loaded and passed as the ``WebIdentityToken`` argument to the ``AssumeRoleWithWebIdentity`` operation. * ``role_session_name`` - The name applied to this assume-role session. This value affects the assumed role user ARN (such as arn:aws:sts::123456789012:assumed-role/role_name/role_session_name). This maps to the ``RoleSessionName`` parameter in the ``AssumeRoleWithWebIdentity`` operation. This is an optional parameter. If you do not provide this value, a session name will be automatically generated. Below is an example configuration for the minimal amount of configuration needed to configure an assume role with web identity profile:: # In ~/.aws/config [profile web-identity] role_arn=arn:aws:iam:... web_identity_token_file=/path/to/a/token This provider can also be configured via the environment: ``AWS_ROLE_ARN`` The ARN of the role you want to assume. ``AWS_WEB_IDENTITY_TOKEN_FILE`` The path to the web identity token file. ``AWS_ROLE_SESSION_NAME`` The name applied to this assume-role session. .. note:: These environment variables currently only apply to the assume role with web identity provider and do not apply to the general assume role provider configuration. Sourcing Credentials From External Processes -------------------------------------------- .. warning:: The following describes a method of sourcing credentials from an external process. This can potentially be dangerous, so proceed with caution. Other credential providers should be preferred if at all possible. If using this option, you should make sure that the config file is as locked down as possible using security best practices for your operating system. Ensure that your custom credential tool does not write any secret information to StdErr because the SDKs and CLI can capture and log such information, potentially exposing it to unauthorized users. If you have a method of sourcing credentials that isn't built in to the AWS CLI, you can integrate it by using ``credential_process`` in the config file. The AWS CLI will call that command exactly as given and then read json data from stdout. The process must write credentials to stdout in the following format:: { "Version": 1, "AccessKeyId": "", "SecretAccessKey": "", "SessionToken": "", "Expiration": "" } The ``Version`` key must be set to ``1``. This value may be bumped over time as the payload structure evolves. The ``Expiration`` key is an ISO8601 formatted timestamp. If the ``Expiration`` key is not returned in stdout, the credentials are long term credentials that do not refresh. Otherwise the credentials are considered refreshable credentials and will be refreshed automatically. NOTE: Unlike with assume role credentials, the AWS CLI will NOT cache process credentials. If caching is needed, it must be implemented in the external process. The process can return a non-zero RC to indicate that an error occurred while retrieving credentials. Some process providers may need additional information in order to retrieve the appropriate credentials. This can be done via command line arguments. NOTE: command line options may be visible to process running on the same machine. Example configuration:: [profile dev] credential_process = /opt/bin/awscreds-custom Example configuration with parameters:: [profile dev] credential_process = /opt/bin/awscreds-custom --username monty Service Specific Configuration ============================== API Versions ------------ The API version to use for a service can be set using the ``api_versions`` key. To specify an API version, set the API version to the name of the service as a sub value for ``api_versions``. Example configuration:: [profile development] aws_access_key_id=foo aws_secret_access_key=bar api_versions = ec2 = 2015-03-01 cloudfront = 2015-09-17 By setting an API version for a service, it ensures that the interface for that service's commands is representative of the specified API version. In the example configuration, the ``ec2`` CLI commands will be representative of Amazon EC2's ``2015-03-01`` API version and the ``cloudfront`` CLI commands will be representative of Amazon CloudFront's ``2015-09-17`` API version. AWS STS ------- To set STS endpoint resolution logic, use the ``AWS_STS_REGIONAL_ENDPOINTS`` environment variable or ``sts_regional_endpoints`` configuration file option. By default, this configuration option is set to ``legacy``. Valid values are: * ``regional`` Uses the STS endpoint that corresponds to the configured region. For example if the client is configured to use ``us-west-2``, all calls to STS will be make to the ``sts.us-west-2.amazonaws.com`` regional endpoint instead of the global ``sts.amazonaws.com`` endpoint. * ``legacy`` Uses the global STS endpoint, ``sts.amazonaws.com``, for the following configured regions: * ``ap-northeast-1`` * ``ap-south-1`` * ``ap-southeast-1`` * ``ap-southeast-2`` * ``aws-global`` * ``ca-central-1`` * ``eu-central-1`` * ``eu-north-1`` * ``eu-west-1`` * ``eu-west-2`` * ``eu-west-3`` * ``sa-east-1`` * ``us-east-1`` * ``us-east-2`` * ``us-west-1`` * ``us-west-2`` All other regions will use their respective regional endpoint. Retry Configuration ------------------- These configuration variables control how the AWS CLI retries requests. ``max_attempts`` An integer representing the maximum number attempts that will be made for a single request, including the initial attempt. For example, setting this value to 5 will result in a request being retried up to 4 times. If not provided, the number of retries will default to whatever is modeled, which is typically 5 total attempts in the ``legacy`` retry mode, and 3 in the ``standard`` and ``adaptive`` retry modes. ``retry_mode`` A string representing the type of retries the AWS CLI will perform. Value values are: * ``legacy`` - The pre-existing retry behavior. This is default value if no retry mode is provided. * ``standard`` - A standardized set of retry rules across the AWS SDKs. This includes a standard set of errors that are retried as well as support for retry quotas, which limit the number of unsuccessful retries an SDK can make. This mode will default the maximum number of attempts to 3 unless a ``max_attempts`` is explicitly provided. * ``adaptive`` - An experimental retry mode that includes all the functionality of ``standard`` mode along with automatic client side throttling. This is a provisional mode that may change behavior in the future. Amazon S3 --------- There are a number of configuration variables specific to the S3 commands. See :doc:`s3-config` (``aws help topics s3-config``) for more details. OS Specific Configuration ========================= Locale ------ If you have data stored in AWS that uses a particular encoding, you should make sure that your systems are configured to accept that encoding. For instance, if you have unicode characters as part of a key on EC2 you will need to make sure that your locale is set to a unicode-compatible locale. How you configure your locale will depend on your operating system and your specific IT requirements. One option for UNIX systems is the ``LC_ALL`` environment variable. Setting ``LC_ALL=en_US.UTF-8``, for instance, would give you a United States English locale which is compatible with unicode.
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