Merge pull request #43 from digitalocean/fix_ceph_connection

bug: fix installation of ceph libraries, add docker tags

.travis.yml

@@ -5,6 +5,9 @@ dist: trusty
 go:
   - 1.5
 
+env:
+  - DOCKER_TAG=$TRAVIS_TAG
+
 before_install:
   - sudo apt-get update
   - sudo apt-get install -y librados-dev librbd-dev
@@ -26,5 +29,5 @@ script:
 after_success:
   - if [ "$TRAVIS_BRANCH" == "master" ]; then
     docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD";
-    docker push digitalocean/ceph_exporter;
+    docker push digitalocean/ceph_exporter:$DOCKER_TAG;
     fi

Dockerfile

@@ -11,7 +11,8 @@ RUN apt-get update && \
 
 RUN echo "deb https://download.ceph.com/debian-jewel trusty main" >> /etc/apt/sources.list
 
-RUN apt-get install -y --force-yes librados-dev librbd-dev
+RUN apt-get update && \
+    apt-get install -y --force-yes librados-dev librbd-dev
 
 RUN \
   mkdir -p /goroot && \