Code samples for the Go microservice blog series
- 2019-07-27: Total rewrite of Go code, including introducing Makefiles for build and a docker-compose file for deployment on Docker Swarm.
Some URLs to remember
Turbine stream URL: http://192.168.99.100:8282/turbine.stream?cluster=swarm Hystrix stream URL: http://accountservice:8181/hystrix.stream?cluster=swarm
Make sure Turbine doesn't crash on startup due to AMQ connection problem.
Setting up Docker Swarm cluster
docker-machine create --driver virtualbox --virtualbox-cpu-count 4 --virtualbox-memory 6000 --virtualbox-disk-size 30000 swarm-manager-0 eval "$(docker-machine env swarm-manager-0)" docker network create --driver overlay my_network docker swarm init --advertise-addr 192.168.99.100
Adding a worker node
docker swarm join --token SWMTKN-1-5njothki0tww7gestuh309qgrnr6r357phlsn7ue0r8qmlqnla-181tl1rfou16vv3e7nxrk4ra3 192.168.99.100:2377
You need Go 1.12 or later installed on your system to build from source.
Builds are performed using Makefile(s). In the root /goblog folder:
One can also run all tests, format code using makefile targets.
The make target uses docker stack deploy behind the scenes.
Nice to haves
Here's some minor stuff worth remembering.
Running the CockroachDB client
Find a container running the cockroachdb/cockroach container using docker ps and note the container ID. Then we'll use docker exec to launch the SQL CLI:
> docker exec -it 10f4b6c727f8 ./cockroach sql --insecure
Create user and database for Cockroach
(this is possibly broken, from part 16 onwards the initial DB setup is performed using the docker stack)
DROP USER IF EXISTS cockroach; \ DROP DATABASE IF EXISTS account CASCADE; \ CREATE DATABASE IF NOT EXISTS account; \ CREATE USER cockroach WITH PASSWORD 'password'; \ GRANT ALL ON DATABASE account TO cockroach;