Dockerfile

@@ -1,7 +1,5 @@
-FROM debian:10-slim
+FROM alpine:3
-RUN apt-get update && apt-get -y install openntpd \ 
+RUN apk add openntpd && mkdir -m 1777 /var/empty/tmp
-    && mkdir /var/run/openntpd \ 
-    && apt-get clean
 COPY ./ntpd.conf /etc/ntpd.conf
 EXPOSE 123/udp
 ENTRYPOINT ["/usr/sbin/ntpd", "-d", "-f", "/etc/ntpd.conf"]

README.md

@@ -13,15 +13,15 @@ equally well wherever you live in Sweden.
 
 ### As a client
 To simply use it as a client to synchronize your local computer clock, just
-run it and add the capability to change the clock and set the nice level. For example:
+run it and add the capability to change the clock. For example:
 
-    docker run -d --name ntp --cap-add SYS_TIME --cap-add SYS_NICE --restart=always jackbenny/swedish-ntp
+    docker run -d --name ntp --cap-add SYS_TIME --restart=always swedish-ntp
 
 ### As a server
 You need to publish UDP port 123 to be able to connect to the OpenNTPD daemon. 
 For example:
 
-    docker run -d --name ntp --cap-add SYS_TIME --cap-add SYS_NICE --publish 123:123/udp --restart=always jackbenny/swedish-ntp
+    docker run -d --name ntp --cap-add SYS_TIME --publish 123:123/udp --restart=always swedish-ntp
 
 # Additional information
 For more information about Netnod NTP servers, see [Netnod's NTP

ntpd.conf

@@ -9,3 +9,5 @@ server sth2.ntp.se weight 1
 server svl1.ntp.se weight 1
 server svl2.ntp.se weight 1
 
+sensor *
+constraints from "https://www.google.se"