From 5538470a5df143e78024214d13949694ffab7be4 Mon Sep 17 00:00:00 2001
From: Marcel Schwarz <marcel@icaotix.de>
Date: Fri, 1 Dec 2023 22:47:58 +0100
Subject: [PATCH] Add sample on how to run a cron task in a docker container

---
 Dockerfile         | 12 ++++++++++++
 crontab-file       |  1 +
 docker-compose.yml |  8 ++++++++
 output/out.txt     | 19 +++++++++++++++++++
 task.sh            |  1 +
 5 files changed, 41 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 crontab-file
 create mode 100644 docker-compose.yml
 create mode 100644 output/out.txt
 create mode 100755 task.sh

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..e7ac0c2
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,12 @@
+# Dockerfile to create image with cron services
+FROM ubuntu:latest
+
+# Install Cron
+RUN apt-get update \
+    && apt-get -y install cron \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN useradd test
+
+# Run the command on container startup
+CMD crontab -u test /home/test/cron/crontab-file && cron -f
diff --git a/crontab-file b/crontab-file
new file mode 100644
index 0000000..09a22a1
--- /dev/null
+++ b/crontab-file
@@ -0,0 +1 @@
+* * * * * bash /test/cron/task.sh
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..e64da29
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,8 @@
+version: '3'
+services:
+  cron:
+    build: .
+    volumes:
+      - ./output:/output
+      - ./:/home/test/cron
+    
\ No newline at end of file
diff --git a/output/out.txt b/output/out.txt
new file mode 100644
index 0000000..ffc3c4b
--- /dev/null
+++ b/output/out.txt
@@ -0,0 +1,19 @@
+Hello World at Thu Nov 30 21:45:01 UTC 2023
+Hello World at Thu Nov 30 21:46:01 UTC 2023
+Hello World at Thu Nov 30 21:47:01 UTC 2023
+Hello World at Thu Nov 30 21:48:01 UTC 2023
+Hello World at Thu Nov 30 21:52:01 UTC 2023
+Hello World at Thu Nov 30 21:53:01 UTC 2023
+Hello World at Thu Nov 30 21:54:01 UTC 2023
+Hello World at Thu Nov 30 21:55:01 UTC 2023
+Hello World at Thu Nov 30 21:56:01 UTC 2023
+Hello World at Thu Nov 30 21:57:01 UTC 2023
+Hello World at Thu Nov 30 22:02:01 UTC 2023
+Hello World at Thu Nov 30 22:03:01 UTC 2023
+Hello World at Thu Nov 30 22:04:01 UTC 2023
+Hello World at Thu Nov 30 22:05:01 UTC 2023
+Hello World at Thu Nov 30 22:06:01 UTC 2023
+Hello World at Thu Nov 30 22:07:01 UTC 2023
+Hello World at at at at at Thu Nov 30 22:08:01 UTC 2023
+Hello World at at at at at Thu Nov 30 22:09:01 UTC 2023: /root
+Hello World at at at at at Thu Nov 30 22:10:01 UTC 2023: /root
diff --git a/task.sh b/task.sh
new file mode 100755
index 0000000..c3b8682
--- /dev/null
+++ b/task.sh
@@ -0,0 +1 @@
+echo "Hello World at at at at at $(date): $(pwd)" >> /output/out.txt
\ No newline at end of file