From 6dda52f3846ccf91278f603aa743941731298c3b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniele=20Vigan=C3=B2?= <daniele@vigano.me>
Date: Wed, 3 Jun 2020 01:07:22 +0200
Subject: [PATCH] Add ntpd server to the stack

---
 docker/docker-compose.yml | 8 ++++++++
 docker/ntpd/Dockerfile    | 8 ++++++++
 docker/ntpd/chrony.conf   | 3 +++
 3 files changed, 19 insertions(+)
 create mode 100644 docker/ntpd/Dockerfile
 create mode 100644 docker/ntpd/chrony.conf

diff --git a/docker/docker-compose.yml b/docker/docker-compose.yml
index 0293715..d6917b8 100644
--- a/docker/docker-compose.yml
+++ b/docker/docker-compose.yml
@@ -11,6 +11,14 @@ x-op-service-default: &service_default
   init: true
 
 services:
+  ntpd:
+    <<: *service_default
+    image: daniviga/ntpd
+    networks:
+      - net
+    ports:
+      - "127.0.0.1:123:123/udp"
+
   timescale:
     <<: *service_default
     image: timescale/timescaledb:latest-pg12
diff --git a/docker/ntpd/Dockerfile b/docker/ntpd/Dockerfile
new file mode 100644
index 0000000..859f3c6
--- /dev/null
+++ b/docker/ntpd/Dockerfile
@@ -0,0 +1,8 @@
+FROM alpine:3.9
+
+RUN apk update && apk add chrony && \
+    chown -R chrony:chrony /var/lib/chrony
+COPY ./chrony.conf /etc/chrony/chrony.conf
+
+EXPOSE 123/udp
+ENTRYPOINT ["chronyd", "-d", "-s", "-x"]
diff --git a/docker/ntpd/chrony.conf b/docker/ntpd/chrony.conf
new file mode 100644
index 0000000..80b99ca
--- /dev/null
+++ b/docker/ntpd/chrony.conf
@@ -0,0 +1,3 @@
+pool pool.ntp.org iburst
+initstepslew 10 pool.ntp.org
+driftfile /var/lib/chrony/chrony.drift