asolkar/speed-data-docker
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Added new parameter CRON_MINUTE to docker image

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This can be used to start the cron on a specific minute within
the hour. By default, the cron will run in the 10th minute
This commit is contained in:
Mahesh Asolkar
2025-12-06 14:59:43 -08:00
parent 8d4d317330
commit 10be012150
2 changed files with 15 additions and 14 deletions
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13
Dockerfile
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@@ -2,6 +2,13 @@ FROM debian:stable-slim
ENV DEBIAN_FRONTEND=noninteractive ENV DEBIAN_FRONTEND=noninteractive
# Default is to run cron job in the 10th minute of each hour
# You can override at runtime with -e CRON_MINUTE=xx
ENV CRON_MINUTE=10
# Default port for http server inside container.
# You can override at runtime with -e PORT=xxxx
ENV PORT=8080
# Install required packages: curl, cron, busybox (httpd), ca-certificates # Install required packages: curl, cron, busybox (httpd), ca-certificates
RUN apt-get update \ RUN apt-get update \
&& apt-get install -y --no-install-recommends curl cron busybox ca-certificates gnupg dirmngr \ && apt-get install -y --no-install-recommends curl cron busybox ca-certificates gnupg dirmngr \
@@ -25,14 +32,8 @@ COPY start.sh /usr/local/bin/start.sh
# Ensure scripts are executable # Ensure scripts are executable
RUN chmod +x /usr/local/bin/run_speed_test.sh /usr/local/bin/start.sh RUN chmod +x /usr/local/bin/run_speed_test.sh /usr/local/bin/start.sh
# Add cron job to run every hour at minute 0
RUN printf "0 * * * * root /usr/local/bin/run_speed_test.sh >> /var/log/cron.log 2>&1\n" > /etc/cron.d/speedtest-cron \
&& chmod 0644 /etc/cron.d/speedtest-cron
# Expose default HTTP port and declare data volume # Expose default HTTP port and declare data volume
VOLUME ["/var/www/data/speed"] VOLUME ["/var/www/data/speed"]
# Default port for http server inside container. You can override at runtime with -e PORT=xxxx
ENV PORT=8080
EXPOSE 8080 EXPOSE 8080
# Start script will launch cron and the HTTP server # Start script will launch cron and the HTTP server

14
start.sh
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@@ -2,6 +2,9 @@
set -e set -e
CRON_MINUTE=${CRON_MINUTE:-10}
PORT=${PORT:-8080}
# Ensure data directory exists # Ensure data directory exists
mkdir -p /var/www/data/speed mkdir -p /var/www/data/speed
@@ -17,20 +20,17 @@ chmod -R a+rwX /var/www/data || true
# We run it in background so server starts promptly. The cron will run hourly. # We run it in background so server starts promptly. The cron will run hourly.
/usr/local/bin/run_speed_test.sh || true & /usr/local/bin/run_speed_test.sh || true &
# Ensure the cron job exists in root's crontab (so `crontab -l` shows it) # Ensure the cron job exists in Cron
CRON_ENTRY="* * * * * /usr/local/bin/run_speed_test.sh >> /var/log/cron.log 2>&1" CRON_FILE=/etc/cron.d/speedtest-cron
if crontab -l 2>/dev/null | grep -F "$CRON_ENTRY" >/dev/null 2>&1; then if grep run_speed_test ${CRON_FILE}; then
echo "cron entry already present" echo "cron entry already present"
else else
(crontab -l 2>/dev/null; echo "$CRON_ENTRY") | crontab - echo ${CRON_MINUTE} '* * * * /usr/local/bin/run_speed_test.sh >> /var/log/cron.log 2>&1' > ${CRON_FILE}
echo "installed cron entry into root crontab"
fi fi
# Start Debian cron in background # Start Debian cron in background
service cron start || cron || true service cron start || cron || true
PORT=${PORT:-8080}
# Start busybox httpd serving /var/www on configured port in foreground # Start busybox httpd serving /var/www on configured port in foreground
if command -v busybox >/dev/null 2>&1; then if command -v busybox >/dev/null 2>&1; then
echo "starting busybox httpd on port ${PORT} serving /var/www" echo "starting busybox httpd on port ${PORT} serving /var/www"