add compose file

README.md

@@ -67,6 +67,7 @@ achieve by mounting it as a volume: `-v /path/to/some/host/disk:/data`
 
 ```bash
 docker run \
+    --cap_add=SYS_ADMIN \
     --name btsync-nfs \
     bootstrap SECRET_HERE some-third-party-image
 
@@ -75,6 +76,7 @@ docker run \
 # replacing entrypoint and command. (Advanced users)
 docker run \
     --name some-third-party-image \
+    --cap_add=SYS_ADMIN \
     -e CONTAINER_DATA_PATH=/container/data/path \
     --entrypoint /bin/sh \
     some-third-party-image: latest \
@@ -91,6 +93,7 @@ mount -t nfs4 btsync.link.or.ip:/yolo /path/to/mount/on
 
 ```bash
 docker run \
+    --cap_add=SYS_ADMIN \
     --name btsync \
     cusspvz/btsync:latest
 ```
@@ -210,6 +213,16 @@ Defaults to: 1000
 ### GID
 Defaults to: 1000
 
+## docker-compose
+
+We also provide a docker-compose file as example.
+Instead running container in privileged mode, we opted for running with flag `cap_add=SYS_ADMIN` which is sufficient for performing mount and umount operations
+inside container.
+If you need more informations about capabilities take a look at:
+
+Docker [documentation](https://docs.docker.com/engine/reference/run/)
+Linux man [page](http://linux.die.net/man/7/capabilities) about capabilities levels
+
 ## Development
 
 ##### build and run a container

docker-compose.yml

@@ -0,0 +1,21 @@
+btsync:
+   restart: always
+   image: cusspvz/btsync:2.0.1
+   cap_add:
+   - SYS_ADMIN
+   command:
+   - bootstrap
+   - A2R52BNYBKUXXQXCS76QCUPX3HGFJGGZT
+   - test
+   stdin_open: true
+
+ubuntu:
+    restart: always
+    image: ubuntu:latest
+    cap_add:
+    - SYS_ADMIN
+    command:
+    - apt-get -y -qq update; apt-get install -y -qq nfs-common; mount -t nfs4 nfs-server:/test /mnt; cat
+    stdin_open: true
+    links:
+    - btsync:nfs-server