Using the .condarc conda configuration file

Overview

The conda configuration file, .condarc, is an optional runtime configuration file that allows advanced users to configure various aspects of conda, such as which channels it searches for packages, proxy settings and environment directories.

The .condarc file is not included by default, but it is automatically created in your home directory the first time you run the conda config command.

A .condarc file may also be located in the root environment, in which case it overrides any in the home directory.

NOTE: A .condarc file can also be used in an administrator-controlled installation to override the users’ configuration. See Administering a multi-user conda installation.

The .condarc configuration file follows simple YAML syntax.

The .condarc file can change many parameters, including:

  • Where conda looks for packages.
  • If and how conda uses a proxy server.
  • Where conda lists known environments.
  • Whether to update the bash prompt with the current activated environment name.
  • Whether user-built packages should be uploaded to Anaconda.org.
  • Default packages or features to include in new environments.

To create or modify a .condarc file, use the conda config command or use a text editor to create a new file named .condarc and save it to your user home directory or root directory.

EXAMPLE:

conda config --add channels conda-forge

You can also download a sample .condarc file to edit in your editor and save to your user home directory or root directory.

To set configuration options, edit the .condarc file directly or use the conda config --set command.

EXAMPLE: To set the auto_update_conda option to False, run:

conda config --set auto_update_conda False

For a complete list of conda config commands, see the command reference <../../commands/conda-config>. The same list is available at the Terminal or Anaconda Prompt by running conda config --help.

TIP: Conda supports tab completion with external packages instead of internal configuration.

For more information, see the Configuration section of Advanced Features of conda Part 1.

General configuration

Channel locations (channels)

Listing channel locations in the .condarc file overrides conda defaults, causing conda to search only the channels listed here, in the order given.

Use defaults to automatically include all default channels. Non-URL channels are interpreted as Anaconda.org user names. You can change this by modifying the channel_alias as described in Set a channel alias (channel_alias). The default is just defaults.

EXAMPLE:

channels:
  - <anaconda_dot_org_username>
  - http://some.custom/channel
  - file:///some/local/directory
  - defaults

To select channels for a single environment, put a .condarc file in the root directory of that environment.

EXAMPLE: If you have installed Miniconda with Python 3 in your home directory and the environment is named “flowers”, the path may be:

~/miniconda3/envs/flowers/.condarc

Allow other channels (allow_other_channels)

The system-level .condarc file may specify a set of allowed channels, and it may allow users to install packages from other channels with the boolean flag allow_other_channels. The default is True.

If allow_other_channels is set to False, only those channels explicitly specified in the system .condarc file are allowed:

allow_other_channels: False

When allow_other_channels is set to True or not specified, each user has access to the default channels and to any channels that the user specifies in their local .condarc file. When allow_other_channels is set to false, if the user specifies other channels, the other channels are blocked, and the user receives a message reporting that channels are blocked. For more information, see Example administrator-controlled installation.

If the system .condarc file specifies a channel_alias, it overrides any channel aliases set in a user’s .condarc file. See Set a channel alias (channel_alias).

Default channels (default_channels)

Normally the defaults channel points to several channels at the repo.continuum.io repository, but if default_channels is defined, it sets the new list of default channels. This is especially useful for air gap and enterprise installations:

default_channels:
  - <anaconda_dot_org_username>
  - http://some.custom/channel
  - file:///some/local/directory

Update conda automatically (auto_update_conda)

When True, conda updates itself any time a user updates or installs a package in the root environment. When False, conda updates itself only if the user manually issues a conda update command. The default is True.

EXAMPLE:

auto_update_conda: False

Always yes (always_yes)

Choose the yes option whenever asked to proceed, such as when installing. Same as using the --yes flag at the command line. The default is False.

EXAMPLE:

always_yes: True

Show channel URLs (show_channel_urls)

Show channel URLs when displaying what is going to be downloaded and in conda list. The default is False.

EXAMPLE:

show_channel_urls: True

Change command prompt (changeps1)

When using activate, change the command prompt from $PS1 to include the activated environment. The default is True.

EXAMPLE:

changeps1: False

Add pip as Python dependency (add_pip_as_python_dependency)

Add pip, wheel and setuptools as dependencies of Python. This ensures that pip, wheel and setuptools are always installed any time Python is installed. The default is True.

EXAMPLE:

add_pip_as_python_dependency: False

Use pip (use_pip)

Use pip when listing packages with conda list. This does not affect any conda command or functionality other than the output of the command conda list. The default is True.

EXAMPLE:

use_pip: False

Configure conda for use behind a proxy server (proxy_servers)

By default, proxy settings are pulled from the HTTP_PROXY and HTTPS_PROXY environment variables or the system. Setting them here overrides that default:

proxy_servers:
    http: http://user:[email protected]:8080
    https: https://user:[email protected]:8080

To give a proxy for a specific scheme and host, use the scheme://hostname form for the key. This matches for any request to the given scheme and exact host name:

proxy_servers:
  'http://10.20.1.128': 'http://10.10.1.10:5323'

If you do not include the user name and password or if authentication fails, conda prompts for a user name and password.

If your password contains special characters, you need escape them as described in Percent-encoding reserved characters , on Wikipedia.

Be careful not to use http when you mean https or https when you mean http.

SSL verification (ssl_verify)

If you are behind a proxy that does SSL inspection such as a Cisco IronPort Web Security Appliance (WSA), you may need to use ssl_verify to override the SSL verification settings.

By default this variable is True, which means that SSL verification is used and conda verifies certificates for SSL connections. Setting this variable to False disables the connection’s normal security and is not recommended:

ssl_verify: False

You can also set ssl_verify to a string path to a certificate, which can be used to verify SSL connections:

ssl_verify: corp.crt

Offline mode only (offline)

Filters out all channel URLs that do not use the file:// protocol. The default is False.

EXAMPLE:

offline: True

Advanced configuration

Set a channel alias (channel_alias)

Whenever you use the -c or --channel flag to give conda a channel name that is not a URL, conda prepends the channel_alias to the name that it was given. The default channel_alias is https://conda.anaconda.org/.

EXAMPLE: The command:

conda install --channel asmeurer <package>

is the same as:

conda install --channel https://conda.anaconda.org/asmeurer <package>

You can set channel_alias to your own repository.

EXAMPLE: To set channel_alias to your repository at https://yourrepo.com:

channel_alias: https://your.repo/

On Windows, you must include a slash (“/”) at the end of the URL:

EXAMPLE: https://your.repo/conda/

When channel_alias set to your repository at https://yourrepo.com:

conda install --channel jsmith <package>

is the same as:

conda install --channel https://yourrepo.com/jsmith <package>

Always add packages by default (create_default_packages)

When creating new environments, add the specified packages by default. The default packages are installed in every environment you create. You can override this option at the command prompt with the --no-default-packages flag. The default is to not include any packages.

EXAMPLE:

create_default_packages:
  - pip
  - ipython
  - scipy=0.15.0

Track features (track_features)

Enable certain features to be tracked by default. The default is to not track any features. This is similar to adding mkl to the create_default_packages list.

EXAMPLE:

track_features:
  - mkl

Disable updating of dependencies (update_dependencies)

By default, conda install updates the given package to the latest version, and installs any dependencies necessary for that package. However if dependencies that satisfy the package’s requirements are already installed, conda will not update those packages to the latest version.

In this case, if you would prefer that conda update all dependencies to the latest version that is compatible with the environment, set update_dependencies to True:

update_dependencies: False

NOTE: Conda still ensures that dependency specifications are satisfied. Thus, some dependencies may still be updated or, conversely, this may prevent packages given at the command line from being updated to their latest versions. You can always specify versions at the command line to force conda to install a given version, such as conda install numpy=1.9.3.

To avoid updating only specific packages in an environment, a better option may be to pin them. For more information, see Preventing packages from updating (pinning).

Disallow installation of specific packages (disallow)

Disallow the installation of certain packages. The default is to allow installation of all packages.

EXAMPLE:

disallow:
  - anaconda

Add Anaconda.org token to automatically see private packages (add_anaconda_token)

When the channel alias is Anaconda.org or an Anaconda Server GUI, you can set the system configuration so that users automatically see private packages. Anaconda.org was formerly known as binstar.org. This uses the Anaconda command-line client, which you can install with conda install anaconda-client, to automatically add the token to the channel URLs.

The default is True.

EXAMPLE:

add_anaconda_token: False

NOTE: Even when set to True, this setting is enabled only if the Anaconda command-line client is installed and you are logged in with the anaconda login command.

Specify environment directories (envs_dirs)

Specify directories in which environments are located. If this key is set, the root prefix envs_dir is not used unless explicitly included. This key also determines where the package caches are located.

For each envs here, envs/pkgs is used as the pkgs cache, except for the standard envs directory in the root directory, for which the normal root_dir/pkgs is used.

EXAMPLE:

envs_dirs:
  - ~/my-envs
  - /opt/anaconda/envs

The CONDA_ENVS_PATH environment variable overwrites this setting:

  • For macOS and Linux: CONDA_ENVS_PATH=~/my-envs:/opt/anaconda/envs
  • For Windows: set CONDA_ENVS_PATH=C:\Users\joe\envs;C:\Anaconda\envs

Specify package directories (pkgs_dirs)

Specify directories in which packages are located. If this key is set, the root prefix pkgs_dirs is not used unless explicitly included.

EXAMPLE:

pkgs_dirs:
  - /opt/anaconda/pkgs

The CONDA_PKGS_DIRS environment variable overwrites this setting:

  • For macOS and Linux: CONDA_PKGS_DIRS=/opt/anaconda/pkgs
  • For Windows: set CONDA_PKGS_DIRS=C:\Anaconda\pkgs

Conda build configuration

Specify conda build output root directory (root-dir)

Build output root directory. You can also set this with the CONDA_BLD_PATH environment variable. The default is <CONDA_PREFIX>/conda-bld/. If you do not have write permissions to <CONDA_PREFIX>/conda-bld/ , the default is ~/conda-bld/ .

EXAMPLE:

conda-build:
    root-dir: ~/conda-builds

Automatically upload conda build packages to Anaconda.org (anaconda_upload)

Automatically upload packages built with conda build to Anaconda.org. The default is False.

EXAMPLE:

anaconda_upload: True

Token to be used for Anaconda.org uploads (conda-build 3.0+) (anaconda_token)

Tokens are a means of authenticating with anaconda.org without logging in. You can pass your token to conda-build with this condarc setting, or with a CLI argument. This is unset by default. Setting it implicitly enables anaconda_upload.

conda-build:
    anaconda_token: gobbledygook

Limit build output verbosity (conda-build 3.0+) (quiet)

Conda-build’s output verbosity can be reduced with the quiet setting. For more verbosity use the CLI flag --debug.

conda-build:
    quiet: true

Disable filename hashing (conda-build 3.0+) (filename_hashing)

Conda-build 3 adds hashes to filenames to allow greater customization of dependency versions. If you find this disruptive, you can disable the hashing with the following config entry:

conda-build:
    filename_hashing: false

NOTE: conda-build does no checking when clobbering packages. If you utilize conda-build 3’s build matrices with a build configuration that is not reflected in the build string, packages will be missing due to clobbering.

Disable recipe and package verification (conda-build 3.0+) (no_verify)

By default, conda-build uses conda-verify to ensure that your recipe and package meet some minimum sanity checks. You can disable these:

conda-build:
    no_verify: true

Disable per-build folder creation (conda-build 3.0+) (set_build_id)

By default, conda-build creates a new folder for each build, named for the package name plus a timestamp. This allows you to do multiple builds at once. If you have issues with long paths, you may need to disable this behavior. You should first try to change the build output root directory with the root-dir setting described above, but fall back to this as necessary:

conda-build:
    set_build_id: false

Skip building packages that already exist (conda-build 3.0+) (skip_existing)

By default, conda-build builds all recipes that you specify. You can instead skip recipes that are already built. A recipe is skipped if and only if all of its outputs are available on your currently configured channels.

conda-build:
    skip_existing: true

Omit recipe from package (conda-build 3.0+) (include_recipe)

By default, conda-build includes the recipe that was used to build the package. If this contains sensitive or proprietary information, you can omit the recipe.

conda-build:
    include_recipe: false

NOTE: If you do not include the recipe, you cannot use conda-build to test the package after the build completes. This means that you cannot split your build and test steps across two distinct CLI commands (conda build --notest recipe and conda build -t recipe). If you need to omit the recipe and split your steps, your only option is to remove the recipe files from the tarball artifacts after your test step. Conda-build does not provide tools for doing that.

Disable activation of environments during build/test (conda-build 3.0+) (activate)

By default, conda-build activates the build and test environments prior to executing the build or test scripts. This adds necessary PATH entries, and also runs any activate.d scripts you may have. If you disable activation, the PATH will still be modified, but the activate.d scripts will not run. This is not recommended, but some people prefer this.

conda-build:
    activate: false

PyPI upload settings (conda-build 3.0+) (pypirc)

Unset by default. If you have wheel outputs in your recipe, conda-build will try to upload them to the PyPI repository specified by the pypi_repository setting using credentials from this file path.

conda-build:
    pypirc: ~/.pypirc

PyPI repository to upload to (conda-build 3.0+) (pypi_repository)

Unset by default. If you have wheel outputs in your recipe, conda-build will try to upload them to this PyPI repository using credentials from the file specified by the pypirc setting.

conda-build:
    pypi_repository: pypi

Obtaining information from the .condarc file

NOTE: It may be necessary to add the “force” option -f to the following commands.

To get all keys and their values:

conda config --get

To get the value of a specific key, such as channels:

conda config --get channels

To add a new value, such as http://conda.anaconda.org/mutirri, to a specific key, such as channels:

conda config --add channels http://conda.anaconda.org/mutirri

To remove an existing value, such as http://conda.anaconda.org/mutirri from a specific key, such as channels:

conda config --remove channels http://conda.anaconda.org/mutirri

To remove a key, such as channels, and all of its values:

conda config --remove-key channels

To configure channels and their priority for a single environment, make a .condarc file in the root directory of that environment.