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notification-manifests

Kubernetes manifest files for notification.canada.ca.

How does this repository work?

This repository uses version 2.0.3 of Kustomize, which is baked into kubectl to apply different environment overlays (staging, production), on to an existing base configuration. As a result the base directory describes all the commonalities between all environments, while the env/staging and env/production directories contain the environment specific configurations. These include:

  • Environment variables
  • Target group bindings between the AWS network infrastructure and the Kubernetes cluster
  • Replica count patches (ex. How many pods of each type run in each environment)

How are environment variables set?

To set the variables for the API Lambda see this

Kustomize can dynamically inject environment variables when it compiles the configuration. To do this it reads out the environment variables and creates a ConfigMap object using an .env file that is in the same directory as the overlay that is being called from (ex. /env/staging/.env). As it is bad practice to save environment variables to a Git repository, the .env is ignored, and instead saved in an encrypted envelope using AWS KMS as .env.enc.aws files.

This means that before the overlay is applied, the file needs to be decrypted.

Decrypting environment variables

You should leverage the appropriate commands in the Makefile:

  • the make decrypt-staging command that will decrypt environment variables in staging ;
  • the make decrypt-production command that will decrypt environment variables in production.
# You need to have the AWS credentials set up on your machine
# under the profile name `notify-staging`.
AWS_PROFILE=notify-staging make decrypt-staging
# This creates a new decrypted file at env/staging/.env

Encrypting variables in staging/production

You should leverage the appropriate commands in the Makefile:

  • the make encrypt-staging command that will encrypt environment variables in staging ;
AWS_PROFILE=notify-staging make decrypt-staging
# Change values in the decrypted file at env/staging/.env
# Encrypt the decrypted file that you just edited
AWS_PROFILE=notify-staging make encrypt-staging
# Creates a new file at env/staging/.env.enc.aws which is safe to commit
  • the make encrypt-production command that will encrypt environment variables in production.
AWS_PROFILE=notify-production make decrypt-production
# Change values in the decrypted file at env/production/.env
# Encrypt the decrypted file that you just edited
AWS_PROFILE=notify-production make encrypt-production
# Creates a new file at env/production/.env.enc.aws which is safe to commit

How do I add a new environment variable?

As mentioned above, you will need to make changes to the .env file to include them in the ConfigMap object. In addition, you need to set up the kustomization.yaml file to include the new environment variable in the ConfigMap. This would look something like this if you wanted to add the variable FOO with the value BAR:

In a .env file add:

FOO=BAR

and then in kustomization.yaml add:

- name: FOO
  objref:
    kind: ConfigMap
    name: application-config
    apiVersion: v1
  fieldref:
    fieldpath: data.FOO

under the vars: key.

You can now reference the variable in you other manifest files using $(FOO).

You also need to add the new variable in env.example so that we can run CI without using any actual live variables.

The last thing you need to do is re-encrypt the .env file to make sure the variable gets saved. You can use the make encrypt-staging command to do this.

How are image tag sets?

To adjust what images are used in the environments, you need to set them in the environment kustomization.yaml file:

images:
  - name: admin
    newName: public.ecr.aws/cds-snc/notify-admin:latest
  - name: api
    newName: public.ecr.aws/cds-snc/notify-api:latest
  - name: document-download-api
    newName: public.ecr.aws/cds-snc/notify-document-download-api:latest

Will set the images in the base deployment to use latest.

In production, we use set image hashes directly, take a look at env/production/kustomization.yaml.

Connecting to the database

  1. First shell into the jump-box container inside the Kubernetes cluster (note the -848d9c6787-p4r2v suffix will be different):
kubectl exec -n notification-canada-ca -it jump-box-848d9c6787-p4r2v -- /bin/sh
  1. Use socat to forward all traffic from the jump-box's port 5430 to the DB_HOST_NAME port 5432. DB_HOST_NAME should be something like notification-canada-ca-staging-cluster.cluster-....ca-central-1.rds.amazonaws.com 
socat TCP-LISTEN:5430,fork TCP:DB_HOST_NAME:5432
  1. Last, on your local machine, map the jump-box remote port 5430 to your local port 5430 (note the -848d9c6787-p4r2v suffix will be different):
kubectl port-forward -n notification-canada-ca jump-box-848d9c6787-p4r2v 5430:5430
  1. You can now connect to the database on your local port 5430 using the username and password. Please do not forget to terminate the socat connection with Ctrl-C once you are done.