Mainflux.mainflux/docker/nginx/entrypoint.sh

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#!/bin/ash
if [ -z "$MF_MQTT_CLUSTER" ]
then
envsubst '${MF_MQTT_ADAPTER_PORT}' < /etc/nginx/snippets/mqtt-upstream-single.conf > /etc/nginx/snippets/mqtt-upstream.conf
envsubst '${MF_MQTT_ADAPTER_WS_PORT}' < /etc/nginx/snippets/mqtt-ws-upstream-single.conf > /etc/nginx/snippets/mqtt-ws-upstream.conf
else
envsubst '${MF_MQTT_ADAPTER_PORT}' < /etc/nginx/snippets/mqtt-upstream-cluster.conf > /etc/nginx/snippets/mqtt-upstream.conf
envsubst '${MF_MQTT_ADAPTER_WS_PORT}' < /etc/nginx/snippets/mqtt-ws-upstream-cluster.conf > /etc/nginx/snippets/mqtt-ws-upstream.conf
fi
envsubst '
${MF_USERS_HTTP_PORT}
${MF_THINGS_HTTP_PORT}
${MF_HTTP_ADAPTER_PORT}
${MF_WS_ADAPTER_PORT}' < /etc/nginx/nginx.conf.template > /etc/nginx/nginx.conf
exec nginx -g "daemon off;"