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Add COMPOSE_API_VERSION to the docs

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Signed-off-by: Daniel Nephin <dnephin@docker.com>
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Daniel Nephin 2015-09-02 16:30:09 -04:00 committed by Daniel Nephin
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docs/reference/overview.md
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@ -31,6 +31,26 @@ Setting this is optional. If you do not set this, the `COMPOSE_PROJECT_NAME` def
Specify the file containing the compose configuration. If not provided, Compose looks for a file named `docker-compose.yml` in the current directory and then each parent directory in succession until a file by that name is found. Specify the file containing the compose configuration. If not provided, Compose looks for a file named `docker-compose.yml` in the current directory and then each parent directory in succession until a file by that name is found.
### COMPOSE\_API\_VERSION
The Docker API only supports requests from clients which report a specific
version. If you receive a `client and server don't have same version error` using
`docker-compose`, you can workaround this error by setting this environment
variable. Set the version value to match the server version.
Setting this variable is intended as a workaround for situations where you need
to run temporarily with a mismatch between the client and server version. For
example, if you can upgrade the client but need to wait to upgrade the server.
Running with this variable set and a known mismatch does prevent some Docker
features from working properly. The exact features that fail would depend on the
Docker client and server versions. For this reason, running with this variable
set is only intended as a workaround and it is not officially supported.
If you run into problems running with this set, resolve the mismatch through
upgrade and remove this setting to see if your problems resolve before notifying
support.
### DOCKER\_HOST ### DOCKER\_HOST
Sets the URL of the `docker` daemon. As with the Docker client, defaults to `unix:///var/run/docker.sock`. Sets the URL of the `docker` daemon. As with the Docker client, defaults to `unix:///var/run/docker.sock`.