Merge pull request #1 from Landoop/docker

Add docker image for running Connect UI easily.

Author: jglambed

docker/Caddyfile

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+0.0.0.0:8000
+tls off
+
+root /kafka-connect-ui
+log /access.log

docker/Dockerfile

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+FROM alpine
+MAINTAINER Marios Andreopoulos <marios@landoop.com>
+
+WORKDIR /
+# Add needed tools
+RUN apk add --no-cache ca-certificates wget \
+    && echo "progress = dot:giga" | tee /etc/wgetrc
+
+# Add and Setup Caddy webserver
+RUN wget "https://caddyserver.com/download/build?os=linux&arch=amd64&features=" -O /caddy.tgz \
+    && mkdir caddy \
+    && tar xzf caddy.tgz -C /caddy \
+    && rm -f /caddy.tgz
+
+# Add and Setup Kafka-Connect-Ui
+ARG CONNECT_UI_URL=https://github.com/Landoop/kafka-connect-ui/releases/download/v0.8.0/kafka-connect-ui-0.8.0.tar.gz
+RUN wget "${CONNECT_UI_URL}" -O /kafka-connect-ui.tar.gz \
+    && mkdir /kafka-connect-ui \
+    && tar xzf /kafka-connect-ui.tar.gz -C /kafka-connect-ui \
+    && rm -f /kafka-connect-ui.tar.gz
+
+# Add configuration and runtime files
+ADD Caddyfile /caddy/
+ADD run.sh /
+RUN chmod +x /run.sh
+
+EXPOSE 8000
+ENTRYPOINT ["/run.sh"]

docker/README.md

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+## Kafka Connect UI ##
+
+[![](https://images.microbadger.com/badges/image/landoop/kafka-connect-ui.svg)](http://microbadger.com/images/landoop/kafka-connect-ui)
+
+This is a small docker image for Landoop's kafka-connect-ui.
+It serves the kafka-connect-ui from port 8000.
+A live version can be found at <https://kafka-connect-ui.landoop.com>
+
+The software is stateless and the only necessary option is your Kafka Connect
+URL:
+
+    docker run --rm -it -p 8000:8000 \
+               -e "CONNECT_URL=http://connect.distributed.url" \
+               landoop/kafka-topics-ui
+
+Visit http://localhost:8000 to see the UI.
+
+Please note that because Connect does not send CORS headers, we have to proxy
+it. What this means for you, is that Connect, while running the container, is
+accessible via `http://your.address:8000/api/kafka-connect`. If this is a
+security issue for you, you should protect your machine via a firewall, or maybe
+do not expose the port and use the container's IP address to access the UI.

docker/run.sh

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+#!/bin/sh
+
+CONNECT_PROXY=/api/kafka-connect
+
+if [[ -z "$CONNECT_URL" ]]; then
+    echo "Kafka Connect URL was not set via CONNECT_URL environment variable."
+    echo "We will fall back to default http://localhost:8083 which probably won't work."
+    # We also change connect proxy in order to make it as visible as possible
+    # that the configuration is bad.
+    CONNECT_PROXY=http://localhost:8083
+fi
+
+CONNECT_URL="${CONNECT_URL:-http://localhost:8083}"
+
+echo
+echo "Enabling proxy because Connect doesn't send CORS headers yet."
+cat <<EOF >>/caddy/Caddyfile
+proxy /api/kafka-connect $CONNECT_URL {
+    without /api/kafka-connect
+}
+EOF
+
+CONNECT_URL=/api/kafka-rest-proxy
+
+cat <<EOF >/kafka-connect-ui/env.js
+var clusters = [
+   {
+     NAME: "default",
+     KAFKA_CONNECT: "$CONNECT_PROXY"
+   }
+]
+EOF
+
+echo
+
+exec /caddy/caddy -conf /caddy/Caddyfile