WeaveDemo EX

A Microservice demo using:

Spring Boot - The services

Docker - The packaging and deployment

Weave - Multihost Networking and DNS for Docker. The DNS will check health of Services.

VirtualBox (with support for 64bit VM's) for demonstrating multihost.

Software requirements: Vagrant and VirtualBox (relatively new) at least 50 gb free disc space JDK 8 (just for building the artifacts, you can do this in another computer).

Part 0 - Clone the project

git clone https://github.com/Khazrak/WeaveDemo.git
cd WeaveDemo

Part 1 - Spring Boot Service

2 Micro Services, Consumer uses Producer.

You Need Java 8 (JDK)

For Linux / OSX

cd weave-demo-consumer
./gradlew build
cd ..
cd weave-demo-producer/
./gradlew build
cd..

For Windows:

cd weave-demo-consumer/
gradlew.bat build
cd..
cd weave-demo-producer/
gradlew.bat build
cd..

Part 2 - Dockerize the Service

Start the VM's (this will take some time)

vagrant up

The Jars and the Dockerfile will be copied into the VM's

Host 1 (Consumer 1)

vagrant ssh weave-demo-01
cd /home/vagrant/consumer
sudo docker build --rm -t "khazrak/weave-consumer:1.0" .

Host 2 (Producer 1)

vagrant ssh weave-demo-02
cd /home/vagrant/producer
sudo docker build --rm -t "khazrak/weave-producer:1.0" .

Host 3 (Producer 2)

vagrant ssh weave-demo-03
cd /home/vagrant/producer
sudo docker build --rm -t "khazrak/weave-producer:1.0" .

Part 3 - Install and Start Weave

Install Weave on all the VM's

The IP addresses we use for this demo are

172.17.8.101 weave-demo-01

172.17.8.102 weave-demo-02

172.17.8.103 weave-demo-02

Install Weave

Host 1

vagrant ssh weave-demo-01
sudo curl -L git.io/weave -o /usr/local/bin/weave
sudo chmod a+x /usr/local/bin/weave

Host 2

vagrant ssh weave-demo-02
sudo curl -L git.io/weave -o /usr/local/bin/weave
sudo chmod a+x /usr/local/bin/weave

Host 3

vagrant ssh weave-demo-03
sudo curl -L git.io/weave -o /usr/local/bin/weave
sudo chmod a+x /usr/local/bin/weave

Start Weave and Weave DNS

On host weave-demo-01

sudo weave launch

On host weave-demo-02

sudo weave launch 172.17.8.101

On host weave-demo-03

sudo weave launch 172.17.8.101

Part 4 - Weave It!

On host 1

sudo weave run --with-dns 10.3.1.1/24 -h weave-consumer.weave.local -e SERVICE_NAME="Consumer 1" -p 8080:8080 khazrak/weave-consumer:1.0

On host 2

sudo weave run --with-dns 10.3.1.2/24 -h weave-service.weave.local -e SERVICE_NAME="Producer 1" --name="prod1" khazrak/weave-producer:1.0

On host 3

sudo weave run --with-dns 10.3.1.3/24 -h weave-service.weave.local -e SERVICE_NAME="Producer 2" --name="prod2" khazrak/weave-producer:1.0

Part 5 - Test it

On host 1:

curl localhost:8080/rest/get

It will return:

Consumer: Consumer, Producer: Producer X

X will be 1 or 2. Usually it will return the same if you try it several times. if you succeed to overload it (to much load) it will use the other.

On host 1:

sudo weave status

After using the curl command the weave-status will show the dns-names.

To test the fail over, stop the container that is used, if X is 1 then on host 1 do:

sudo docker stop prod1

if X is 2 then on host 2 do:

sudo docker stop prod2

Then on host 1:

curl localhost:8080/rest/get

The return message should now show the other number.

On host 1:

sudo weave status

Now one of the dns-names should be gone.

Part 6 - Profit!

The End

/ Karl Andersson

se.linkedin.com/in/karlandersson1987

Problems

If you get:

There are errors in the configuration of this machine. Please fix
the following errors and try again:

File provisioner:
* File upload source file /home/khazrak/Programming/WeaveDemo/weave-demo-consumer/build/libs/weave-demo-consumer-0.0.1-SNAPSHOT.jar must exist
* File upload source file /home/khazrak/Programming/WeaveDemo/weave-demo-producer/build/libs/weave-demo-producer-0.0.1-SNAPSHOT.jar must exist

Then you haven't done part 1 (or it failed).