gitlab-ci.yml deployment on multiple hosts - docker

Question

I need to deploy my application on multiple servers.
I have hosted my source code on gitlab-ci.
I have setup envrionnement variables and .gitlab-ci.yml file
It works great for a single server: I can build docker images and push this images to a registry.
Then i am deploying this images on a kubernetes infrastructure.
All operations are described in .gitlab-ci.yml
What i need to do is to "repeat" .gitlab-ci.yml steps for each server.
I need a different set of envrionment variables for each server. (I will need one docker image for each server, for each upgrade of my application).
Is there a way to do this with gitlab-ci ?
Thanks
** EDIT **
Here is my .gitlab-ci.yml:
stages:
- build
- deploy
build:
stage: build
script:
- docker image build -t my_ci_registry_url/myimagename .
- docker login -u "${CI_REGISTRY_USER}" -p "${CI_REGISTRY_PASSWORD}" "${CI_REGISTRY}"
- docker push my_ci_registry_url/myimagename
deploy:
stage: deploy
environment: production
script:
- kubectl delete --ignore-not-found=true secret mysecret
- kubectl create secret docker-registry mysecret --docker-server=$CI_REGISTRY --docker-username=$CI_REGISTRY_USER --docker-password=$CI_REGISTRY_PASSWORD
- kubectl apply -f myapp.yml
- kubectl rollout restart deployment/myapp-deployment

Answer 1

In order to run same job with different environment variables you can use Yaml Anchors.
For example:
stages:
- build
- deploy
.deploy: &deploy
stage: deploy
environment: production
script:
- some use of $SPECIAL_ENV # from `variables` defined in each job
- some use of $OTHER_SPECIAL_ENV # from `variables` defined in each job
build:
stage: build
script:
- ...
deploy env 1:
variables:
SPECIAL_ENV: $SPECIAL_ENV_1 # from `CI/CD > Variable`
OTHER_SPECIAL_ENV: $OTHER_SPECIAL_ENV-1 # from `CI/CD > Variable`
<<: *deploy
deploy env 2:
variables:
SPECIAL_ENV: $SPECIAL_ENV_2 # from `CI/CD > Variable`
OTHER_SPECIAL_ENV: $OTHER_SPECIAL_ENV_2 # from `CI/CD > Variable`
<<: *deploy
deploy env 3:
variables:
SPECIAL_ENV: $SPECIAL_ENV_3 # from `CI/CD > Variable`
OTHER_SPECIAL_ENV: $OTHER_SPECIAL_ENV_3 # from `CI/CD > Variable`
<<: *deploy
That way on deploy stage the 3 jobs will run (parallel).
You can save the variables in Settings > CI/CD > Variable if they contain sensitive data. If not, just write them in your .gitlab-ci.yml