.. Licensed under the Apache License, Version 2.0 (the "License"); you may not .. use this file except in compliance with the License. You may obtain a copy of .. the License at .. .. http://www.apache.org/licenses/LICENSE-2.0 .. .. Unless required by applicable law or agreed to in writing, software .. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT .. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the .. License for the specific language governing permissions and limitations under .. the License. .. default-domain:: config .. _config/intro: =========================== Introduction To Configuring =========================== Configuration files =================== By default, CouchDB reads configuration files from the following locations, in the following order: #. ``etc/default.ini`` #. ``etc/default.d/*.ini`` #. ``etc/local.ini`` #. ``etc/local.d/*.ini`` Configuration files in the ``*.d/`` directories are sorted by name, that means for example a file with the name ``etc/local.d/00-shared.ini`` is loaded before ``etc/local.d/10-server-specific.ini``. All paths are specified relative to the CouchDB installation directory: ``/opt/couchdb`` recommended on UNIX-like systems, ``C:\CouchDB`` recommended on Windows systems, and a combination of two directories on macOS: ``Applications/Apache CouchDB.app/Contents/Resources/couchdbx-core/etc`` for the ``default.ini`` and ``default.d`` directories, and one of ``/Users//Library/Application Support/CouchDB2/etc/couchdb`` or ``/Users//Library/Preferences/couchdb2-local.ini`` for the ``local.ini`` and ``local.d`` directories. Settings in successive documents override the settings in earlier entries. For example, setting the :option:`chttpd/bind_address` parameter in ``local.ini`` would override any setting in ``default.ini``. .. warning:: The ``default.ini`` file may be overwritten during an upgrade or re-installation, so localised changes should be made to the ``local.ini`` file or files within the ``local.d`` directory. .. highlight:: sh The configuration file chain may be changed by setting the ERL_FLAGS environment variable:: export ERL_FLAGS="-couch_ini /path/to/my/default.ini /path/to/my/local.ini" or by placing the ``-couch_ini ..`` flag directly in the ``etc/vm.args`` file. Passing ``-couch_ini ..`` as a command-line argument when launching ``couchdb`` is the same as setting the ``ERL_FLAGS`` environment variable. .. warning:: The environment variable/command-line flag overrides any ``-couch_ini`` option specified in the ``etc/vm.args`` file. And, **BOTH** of these options **completely** override CouchDB from searching in the default locations. Use these options only when necessary, and be sure to track the contents of ``etc/default.ini``, which may change in future releases. If there is a need to use different ``vm.args`` or ``sys.config`` files, for example, in different locations to the ones provided by CouchDB, or you don't want to edit the original files, the default locations may be changed by setting the COUCHDB_ARGS_FILE or COUCHDB_SYSCONFIG_FILE environment variables:: export COUCHDB_ARGS_FILE="/path/to/my/vm.args" export COUCHDB_SYSCONFIG_FILE="/path/to/my/sys.config" Parameter names and values ========================== All parameter names are *case-sensitive*. Every parameter takes a value of one of five types: `boolean`, `integer`, `string`, `tuple`_ and `proplist`_. Boolean values can be written as ``true`` or ``false``. Parameters with value type of `tuple` or `proplist` are following the Erlang requirement for style and naming. .. _proplist: http://www.erlang.org/doc/man/proplists.html .. _tuple: http://www.erlang.org/doc/reference_manual/data_types.html#id66049 Setting parameters via the configuration file ============================================= .. versionchanged:: 3.3 added ability to have ``=`` in parameter names .. versionchanged:: 3.3 removed the undocumented ability to have multi-line values. The common way to set some parameters is to edit the ``local.ini`` file (location explained above). .. highlight:: ini For example:: ; This is a comment [section] param = value ; inline comments are allowed Each configuration file line may contains `section` definition, `parameter` specification, empty (space and newline characters only) or `commented` line. You can set up `inline` commentaries for `sections` or `parameters`. The `section` defines group of parameters that are belongs to some specific CouchDB subsystem. For instance, :section:`httpd` section holds not only HTTP server parameters, but also others that directly interacts with it. The `parameter` specification contains two parts divided by the `equal` sign (``=``): the parameter name on the left side and the parameter value on the right one. The leading and following whitespace for ``=`` is an optional to improve configuration readability. Since version 3.3 it's possible to use ``=`` in parameter names, but only when the parameter and value are separated `` = ``, i.e. the equal sign is surrounded by at least one space on each side. This might be useful in the ``[jwt_keys]`` section, where base64 encoded keys may contain some ``=`` characters. The semicolon (``;``) signals the start of a comment. Everything after this character is ignored by CouchDB. After editing the configuration file, CouchDB should be restarted to apply any changes. Setting parameters via the HTTP API =================================== .. highlight:: sh Alternatively, configuration parameters can be set via the :ref:`HTTP API `. This API allows changing CouchDB configuration on-the-fly without requiring a server restart:: curl -X PUT http://adm:pass@localhost:5984/_node//_config/uuids/algorithm -d '"random"' The old parameter's value is returned in the response:: "sequential" You should be careful changing configuration via the HTTP API since it's possible to make CouchDB unreachable, for example, by changing the :option:`chttpd/bind_address`:: curl -X PUT http://adm:pass@localhost:5984/_node//_config/chttpd/bind_address -d '"10.10.0.128"' If you make a typo or the specified IP address is not available from your network, CouchDB will be unreachable. The only way to resolve this will be to remote into the server, correct the config file, and restart CouchDB. To protect yourself against such accidents you may set the :option:`chttpd/config_whitelist` of permitted configuration parameters for updates via the HTTP API. Once this option is set, further changes to non-whitelisted parameters must take place via the configuration file, and in most cases, will also require a server restart before taking effect. Configuring the local node ========================== .. highlight:: sh While the :ref:`HTTP API ` allows configuring all nodes in the cluster, as a convenience, you can use the literal string ``_local`` in place of the node name, to interact with the local node's configuration. For example:: curl -X PUT http://adm:pass@localhost:5984/_node/_local/_config/uuids/algorithm -d '"random"'