DSTK:

Distributed System Toolkit. Collection of modules and reference designs to implement stateful services.

Dev Center

• Build: install using

  apt  install protobuf-compiler golang-1.14
  
  # Perfer this over makefile for new changes
  https://taskfile.dev/#/installation

• Dev Guidlines
• Start SE on port 6001
  • task se
  • postgres

  helm repo add bitnami https://charts.bitnami.com/bitnami helm install pq bitnami/postgresql

  
  - 
  

• dev tools
  • k9s
  • stern
  • kubectl
  • helm3(not helm 2)
  • kube_ps1
  • krew
  • kubectx

Reference Architectures

• Stateful Services
  • Memory based counters
  • MKV

PostgreSQL can be accessed via port 5432 on the following DNS name from within your cluster:

pq-postgresql.default.svc.cluster.local - Read/Write connection

To get the password for "postgres" run:

export POSTGRES_PASSWORD=$(kubectl get secret --namespace default pq-postgresql -o jsonpath="{.data.postgresql-password}" | base64 --decode)

To connect to your database run the following command:

kubectl run pq-postgresql-client --rm --tty -i --restart='Never' --namespace default --image docker.io/bitnami/postgresql:11.8.0-debian-10-r61 --env="PGPASSWORD=$POSTGRES_PASSWORD" --command -- psql --host pq-postgresql -U postgres -d postgres -p 5432

To connect to your database from outside the cluster execute the following commands:

kubectl port-forward --namespace default svc/pq-postgresql 5432:5432 &
PGPASSWORD="$POSTGRES_PASSWORD" psql --host 127.0.0.1 -U postgres -d postgres -p 5432

kgpoowide [integ↑1|●8✚9…2] /(⎈ |kind-kind:default) NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES dstk-6bb44bb6c9-n49lh 0/1 CrashLoopBackOff 6 7m16s 10.244.0.9 kind-control-plane dstk-76f76fb66d-vlgp5 0/1 CrashLoopBackOff 7 12m 10.244.0.8 kind-control-plane pq-postgresql-0 1/1 Running 0 46s 10.244.0.11 kind-control-plane POSTGRES_PASSWORD=$(kubectl get secret --namespace default pq-postgresql -o jsonpath="{.data.postgresql-password}" | base64 --decode) echo $POSTGRES_PASSWORD [integ↑1|●8✚9…2] /(⎈ |kind-kind:default) 9iTsWIW7l7 telnet 10.244.0.11 5432 [integ↑1|●8✚9…2] /(⎈ |kind-kind:default) Trying 10.244.0.11... ^C kubectl port-forward --namespace default svc/pq-postgresql 5432:5432 [integ↑1|●8✚9…2] /(⎈ |kind-kind:default) Forwarding from 127.0.0.1:5432 -> 5432 Forwarding from [::1]:5432 -> 5432 ^Z zsh: suspended kubectl port-forward --namespace default svc/pq-postgresql 5432:5432 bg [integ↑1|●8✚9…2] /(⎈ |kind-kind:default) [1] + continued kubectl port-forward --namespace default svc/pq-postgresql 5432:5432 PGPASSWORD="$POSTGRES_PASSWORD" psql --host 127.0.0.1 -U postgres -d postgres -p 5432 [integ↑1|●8✚9…2] /(⎈ |kind-kind:default) zsh: command not found: psql Handling connection for 5432 [integ↑1|●8✚9…2] /(⎈ |kind-kind:default) Handling connection for 5432 Handling connection for 5432 Handling connection for 5432

                                                                                [integ↑1|●8✚10…2] /(⎈ |kind-kind:default)

./scripts/config.sh configs/small-local [integ↑1|●8✚10…2] /(⎈ |kind-kind:default) configmap/dstk-config configured Handling connection for 5432 [integ↑1|●8✚10…2] /(⎈ |kind-kind:default) Handling connection for 5432