Merge pull request #1755 from sroerick/patch-1

added docker file permission instructions.

README.md

@@ -155,6 +155,11 @@ ipfs files that will persist when you restart the container.
     export ipfs_staging=</absolute/path/to/somewhere/>
     export ipfs_data=</absolute/path/to/somewhere_else/>
     
+Make sure docker can access these folders:
+
+    sudo chmod -R 777 /absolute/path/to/somewhere/
+    sudo chmod -R 777 /absolute/path/to/somewhere_else/
+
 Start a container running ipfs and expose ports 4001, 5001 and 8080:
 
     docker run -d --name ipfs_host -v $ipfs_staging:/export -v $ipfs_data:/data/ipfs -p 8080:8080 -p 4001:4001 -p 5001:5001 jbenet/go-ipfs:latest