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require 'dotenv/tasks'
Rake.application.options.trace = false
Dotenv.load('.env.production.cluster')
namespace :kube do
desc 'Rollout a new deployment'
task :deploy do
apply "kube/deployment.yml"
puts `kubectl rollout restart deployment myapp-deployment`
end
desc 'Print useful information aout our Kubernete setup'
task :list do
kubectl 'get pods --all-namespaces'
kubectl 'get services --all-namespaces'
kubectl 'get ingresses --all-namespaces'
end
desc 'Apply our Kubernete configurations to our cluster'
task :setup do
# Add our Docker Hub credentials to our cluster
kubectl(%Q{create secret docker-registry regcred \
--docker-server=#{ENV['DOCKER_REGISTRY_SERVER']} \
--docker-username=#{ENV['DOCKER_USERNAME']} \
--docker-password=#{ENV['DOCKER_PASSWORD']} \
--docker-email=#{ENV['DOCKER_EMAIL']} || true
})
# Install our Service Component
apply "kube/service.yml"
# Install our Rails app Deployment
apply "kube/deployment.yml"
# Installs Nginx Ingress controller
apply "https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml"
# Add a load balancer
apply "https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/cloud-generic.yaml"
# Install our Ingress that will link our load balancer to our service(s)
apply "kube/ingress.yml"
# Add the Digital Ocean token to the cluster
apply "kube/secret-digital-ocean.yml"
# Install cert-manager
kubectl 'create namespace cert-manager'
apply "https://github.com/jetstack/cert-manager/releases/download/v0.14.0/cert-manager.yaml"
# Add our certificate
apply "kube/certificate.yml"
# Add the certificate issuer
apply "kube/cluster-issuer.yml"
end
desc "Set the number of instances to run in the cluster"
task :scale, [:count] => [:environment] do |t, args|
kubectl "scale deployments/myapp-deployment --replicas #{args[:count]}"
end
desc "Run database migrates the database"
task :migrate do
apply "kube/job-migrate.yml"
end
desc "Open a session to a pod on the cluster"
task :shell do
exec "kubectl exec -it #{find_first_pod_name} bash"
end
desc "Tail the log files on production"
task :logs do
exec 'kubectl logs -f -l app=myapp --all-containers'
end
desc "Runs a command in production"
task :run, [:command] => [:environment] do |t, args|
kubectl "exec -it #{find_first_pod_name} echo $(#{args[:command]})"
end
desc "Run rails console in production"
task :console do
system "kubectl exec -it #{find_first_pod_name} bundle exec rails console"
end
desc "Print the environment variables"
task :config do
system "kubectl exec -it #{find_first_pod_name} printenv | sort"
end
def apply(configuration)
if File.file?(configuration)
puts %x{envsubst < #{configuration} | kubectl apply -f -}
else
kubectl "apply -f #{configuration}"
end
end
def kubectl(command)
print %x{ kubectl #{command} }
end
def find_first_pod_name
`kubectl get pods|grep myapp-deployment|awk '{print $1}'|head -n 1`.to_s.strip
end
end
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