$ bundle config [NAME [VALUE]] [--local] [--global] [--delete]
--local: Get/set local configuration
--global: Get/set global configuration
Retrieves or sets a configuration value. If only parameter is provided, retrieve the value. If two parameters are provided, replace the existing value with the newly provided one.
By default, setting a configuration value sets it for all projects on the machine.
If a global setting is superceded by local configuration, this command will show the current value, as well as any superceded values and where they were specified.
$ bundle config
bundle configwith no parameters will print a list of all bundler configuration for the current bundle, and where that configuration was set.
$ bundle config NAME
NAME, and where it was set. Will print both local and global configuration.
$ bundle config NAME VALUE
VALUEfor all bundles executed as the current user (i.e. global setting). The configuration will be stored in
NAMEalready is set,
NAMEwill be overridden and user will be warned.
$ bundle config --global NAME VALUE
$ bundle config --local NAME VALUE
NAMEin both local and global sources.
$ bundle config --delete NAME
NAMEvariable in both local and global sources. Not compatible with --global or --local flag.
You can use
bundle config to give bundler the flags to
pass to the gem installer every time bundler tries to install a
A very common example, the
mysql gem, requires Snow
Leopard users to pass configuration flags to
to specify where to find the
$ gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config
Since the specific location of that executable can change from machine to machine, you can specify these flags on a per-machine basis.
$ bundle config build.mysql --with-mysql-config=/usr/local/mysql/bin/mysql_config
After running this command, every time bundler needs to install the
mysql gem, it will pass along the flags you specified.
Configuration keys in bundler have two forms: the canonical form and the environment variable form.
For instance, passing the
--without flag to
bundle install prevents Bundler from installing
certain groups specified in the
Gemfile. Bundler persists
this value in
app/.bundle/config so that calls to
Bundler.setup do not try to find gems from the
Gemfile that you didn't install. Additionally, subsequent
bundle install remember this setting and
skip those groups.
The canonical form of this configuration is
convert the canonical form to the environment variable form, capitalize
it, and prepend
BUNDLE_. The environment variable form of
List of available keys
The following is a list of all configuration keys and their purpose.
You can learn more about their operation in
1): Setting auto_install config to 1 or any other truthy value will enable automatic installing of gems instead of raising an error. This behavior applies to the following commands:
BUNDLE_PATH): The location on disk to install gems. Defaults to
$GEM_HOMEin development and
BUNDLE_FROZEN): Disallow changes to the
Gemfile. Defaults to
:-separated list of groups whose gems bundler should not installer
BUNDLE_BIN): Install executables from gems in the bundle to the specified directory. Defaults to
BUNDLE_GEMFILE): The name of the file that bundler should use as the
Gemfile. This location of this file also sets the root of the project, which is used to resolve relative paths in the
Gemfile, among other things. By default, bundler will search up from the current working directory until it finds a
In general, you should set these settings per-application by using the
applicable flag to the
bundle install command.
You can set them globally either via environment variables or
bundle config, whichever is preferable for your setup. If
you use both, environment variables will take preference over global
Local git repositories
Bundler also allows you to work against a git repository locally instead of using the remote version. This can be achieved by setting up a local override:
$ bundle config local.GEM_NAME /path/to/local/git/repository
For example, in order to use a local Rack repository, a developer could call:
$ bundle config local.rack ~/Work/git/rack
Now instead of checking out the remote git repository, the local
override will be used. Similar to a path source, every time the local
git repository change, changes will be automatically picked up by
Bundler. This means a commit in the local git repo will update the
revision in the
Gemfile.lock to the local git repo
revision. This requires the same attention as git submodules. Before
pushing to the remote, you need to ensure the local override was
pushed, otherwise you may point to a commit that only exists in your
Bundler does many checks to ensure a developer won't work with
invalid references. Particularly, we force a developer to specify a
branch in the
Gemfile in order to use this feature. If the
branch specified in the `Gemfile` and the current branch in the local
git repository do not match, Bundler will abort. This ensures that a
developer is always working against the correct branches, and prevents
accidental locking to a different branch.
Finally, Bundler also ensures that the current revision in the
Gemfile.lock exists in the local git repository. By doing
this, Bundler forces you to fetch the latest changes in the remotes.
Gem Source Mirrors
If your environment contains a local mirror of the rubygems.org server,
mirror.URL configuration option to supply the URL
of the mirror. At that point, Bundler will download gems and gemspecs
from that mirror instead of the source listed in the Gemfile.
$ bundle config mirror.https://rubygems.org https://localgems.lan