Hands-On Microservices with Kotlin

Scaling instances

Let's first look at which services we have to run with the following command:

docker service ls

This should show us our service instances:

ID            NAME           MODE        REPLICAS  IMAGE                        PORTSsyqgugo598xn  hello-service  replicated  1/1       localhost:5000/hello:latest  *:8080->8080/tcpos5j0iw1p4q1  registry       replicated  1/1       registry:latest              *:5000->5000/tcp

Here, we see that we have 1 replica for hello-service. Let's increase it with the following command:

docker service scale hello-service=3

After a few seconds, we can list our instances again:

docker service ls

This should now show:

ID            NAME           MODE        REPLICAS  IMAGE                        PORTSsyqgugo598xn  hello-service  replicated  3/3       localhost:5000/hello:latest  *:8080->8080/tcpos5j0iw1p4q1 registry replicated 1/1 registry:latest ...