Docker

Dockerfiles plus dependencies

Windows 7 setup hints

Docker Toolbox needs VirtualVM under Windows 7

Set up VirtualBox port forwarding in Settings > Network > Erweitert

=> see https://www.youtube.com/watch?v=_CZar_4_vbk#

boot2docker machine TZ settings special for Windows 7 / Docker Toolkit

You need to add some permanent settings to the docker machine as per the boot2docker FAQ

• create /var/lib/boot2docker/bootlocal.sh in the docker machine
• give exec flag chmod u+x bootlocal.sh

As described in the Tiny Core Linux forum and Wiki

cd /var/lib/boot2docker
tce-fetch.sh tzdata.tcz
mkdir ext
sudo mount tzdata.tcz ext -t squashfs -o loop,ro,bs=4096
# I needed Europe/Berlin; find your timezone by scanning the ./ext directory
cp ext/usr/local/share/zoneinfo/Europe/Berlin ./Europe-Berlin.tz
umount ext
rm -rf ext tzdata.tcz

Europe-Berlin.tz should survive restarts of the docker machine now.

Finally, copy the timezone file when starting up docker-machine by adding the following to the bootlocal script

#!/bin/sh
cp /var/lib/boot2docker/Europe-Berlin.tz /etc/localtime

You should see the correct time now when you enter date

TODOs

• Sort images and push them to the dxmann73 docker registry
• alias ll in alpine bash and change prompt to show cwd
• LABEL maintainer since MAINTAINER is deprecated

docker compose

docker-compose up -d

docker-compose ps

docker-compose logs zookeeper | grep binding
docker-compose logs kafka | grep start

Kafka Quickstart

as per the confluent docs

First, start the cluster in detached mode with

docker compose up -d

You should be able to connect to kafka-manager, but let's do things the hard way for now :-)

Create a topic

# create topic foo
docker-compose exec kafka \
kafka-topics.sh --create --topic foo --partitions 1 --replication-factor 1 --if-not-exists --zookeeper localhost:2181

# check topic foo status
docker-compose exec kafka \
kafka-topics.sh --describe --topic foo --zookeeper localhost:2181

# check general topic status
docker-compose exec kafka \
kafka-topics.sh --describe --zookeeper localhost:2181

# create 42 messages
docker-compose exec kafka \
bash -c "seq 42 | kafka-console-producer.sh --request-required-acks 1 --broker-list localhost:9092 --topic foo && echo 'Produced 42 messages.'"

# read 42 messages
docker-compose exec kafka \
kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic foo --from-beginning --max-messages 42

That's it!

Finally, stop the cluster using

docker-compose stop
# or, if you want to remove the cluster state
docker-compose down

When stuff goes wrong, you can use

docker logs kafka
# or look into the volume
docker volume ls
docker volume inspect zookeeper-logs

Usage with standalone JBoss / Wildfly

The servers in this docker compose cluster advertise themselves as configured in ADVERTISED_HOSTS. Thus, you need to add the advertised host / server names in the hosts file as follows:

192.168.99.100   kafkaserver
192.168.99.100   zooserver