Enhanced to use openssl for Search guard cert support as per https://gist.github.com/floragunncom/9319a994ae09df64b2a173128f745ed2

Dockerfile

@@ -1,10 +1,14 @@
 FROM alpine:3.6
 
-RUN apk --no-cache add python py-setuptools py-pip && \
+RUN apk --no-cache add python py-setuptools py-pip gcc libffi py-cffi python-dev libffi-dev py-openssl musl-dev linux-headers openssl-dev && \
     pip install elasticsearch-curator==5.4.0 && \
-    pip install boto3 && \
-    pip install requests-aws4auth && \
-    apk del py-pip
+    pip install requests-aws4auth==0.9 && \
+    pip install cryptography==2.1.3 && \
+    apk del py-pip gcc python-dev libffi-dev musl-dev linux-headers openssl-dev && \
+    sed -i '/import sys/a urllib3.contrib.pyopenssl.inject_into_urllib3()' /usr/bin/curator && \
+    sed -i '/import sys/a import urllib3.contrib.pyopenssl' /usr/bin/curator && \
+    sed -i '/import sys/a import urllib3' /usr/bin/curator
 
 USER nobody:nobody
+
 ENTRYPOINT ["/usr/bin/curator"]