jacobo/pg-rails

just a rails 5 app that responds on / and requires a postgres DB

$ docker build . -t jacobo/pg-rails
$ docker run -p 5000:5000 jacobo/pg-rails

$ docker push jacobo/pg-rails

Setup the DB:

1. Storage Class

   k create -f k8s_manifests/db-storage-class.yaml k get storageclasses k describe storageclass/pg-pv

2. Volume Claim

   k create -f k8s_manifests/db-volume-claim.yaml k get pvc k describe pvc/pg-pv-claim

3. Secret

   erb -r base64 -r securerandom k8s_manifests/db-secret.yaml | kubectl create -f - k get secret/pg-db-secret -o jsonpath="{.data.postgres-password}" | base64 --decode

4. Deployment

   k create -f k8s_manifests/db-deployment.yaml

   root@pg-for-pg-rails-732073437-tw4vq:/# mount | grep post /dev/xvdba on /var/lib/postgresql/data type ext4 (rw,relatime,data=ordered)

5. Service

   k create -f k8s_manifests/db-service.yaml

   #Go into a new container and connect to your running postgres k run debug -it --rm --image=postgres --restart=Never -- bin/bash $ psql -h pg-rails-service -U postgres

   #or connect via already running container k exec -it pg-for-pg-rails-732073437-db1nf bash

Setup rail App:

TODO: make rails log STDOUT so that k logs is useful?

1. Deployment (app)

2. Service (load balancer)

3. db:create, db:migrate

$ k exec -it pg-rails-1466721731-92jkm bash
    bundle exec rake db:create
    bundle exec rake db:migrate

Use RDS DB instead:

echo REDACTED_FULL_DB_URL | erb -r base64 -r securerandom k8s_manifests/rds-db-url-secret.yaml | kubectl create -f -

k replace -f k8s_manifests/rails-deployment.yaml

k exec -it pg-rails-2343330091-0g9zd bash

---

k run busybox -it --image=busybox --restart=Never -- bin/bash k get pods -a k delete busybox

  k replace -f k8s_manifests/rails-deployment.yaml

helm lifecycle hooks

jobs

https://github.com/kelseyhightower/lobsters-on-kubernetes

---

Let's get to automatically rolling back deployments! (via readiness checks)

Stateful sets (best practice for databases)

Let's get init containers working...