confd-watch

#!/bin/bash

set -eo pipefail

# etcd2 use IANA-assigned port 2379 and 2380, but port 4001 and 7001 are
# still available for compatibility
export ETCD_PORT=${ETCD_PORT:-4001}
export HOST_IP=${HOST_IP:-172.17.8.1}
export ETCD=$HOST_IP:$ETCD_PORT

echo "[nginx] booting container. ETCD: $ETCD."

# Make initial configuration every 5 seconds until successful
until confd -onetime -node $ETCD -config-file /etc/confd/conf.d/nginx.toml; do
    echo "[nginx] waiting for confd to create initial nginx configuration."
    sleep 5
done

# Polling `confd` process for changes every 10 seconds
confd -interval 10 -node $ETCD -config-file /etc/confd/conf.d/nginx.toml &
echo "[nginx] confd is now monitoring etcd for changes..."

# Start the Nginx service using the generated config
echo "[nginx] starting nginx service..."
service nginx start

# Follow the logs to allow the script to continue running
tail -f /var/log/nginx/*.log