Kubernetes

Requirements

Before proceeding, please ensure that you have a Kubernetes cluster running K8s 1.19+ and have Helm 3.5+ installed.

You'll also want to install the latest version of Coder locally in order to log in and manage templates.

Install Coder with Helm

1. Create a namespace for Coder, such as coder:

   kubectl create namespace coder
   

2. Create a PostgreSQL deployment. Coder does not manage a database server for you.

   If you're in a public cloud such as Google Cloud, AWS, Azure, or DigitalOcean, you can use the managed PostgreSQL offerings they provide. Make sure that the PostgreSQL service is running and accessible from your cluster. It should be in the same network, same project, etc.

   You can install Postgres manually on your cluster using the Bitnami PostgreSQL Helm chart. There are some helpful guides on the internet that explain sensible configurations for this chart. Example:

   # Install PostgreSQL
   helm repo add bitnami https://charts.bitnami.com/bitnami
   helm install coder-db bitnami/postgresql \
       --namespace coder \
       --set auth.username=coder \
       --set auth.password=coder \
       --set auth.database=coder \
       --set persistence.size=10Gi
   

   The cluster-internal DB URL for the above database is:

   postgres://coder:[email protected]:5432/coder?sslmode=disable
   

   Ensure you set up periodic backups so you don't lose data.

   You can use Postgres operator to manage PostgreSQL deployments on your Kubernetes cluster.

3. Create a secret with the database URL:

   # Uses Bitnami PostgreSQL example. If you have another database,
   # change to the proper URL.
   kubectl create secret generic coder-db-url -n coder \
      --from-literal=url="postgres://coder:[email protected]:5432/coder?sslmode=disable"
   

4. Add the Coder Helm repo:

   helm repo add coder-v2 https://helm.coder.com/v2
   

5. Create a values.yaml with the configuration settings you'd like for your deployment. For example:

   coder:
     # You can specify any environment variables you'd like to pass to Coder
     # here. Coder consumes environment variables listed in
     # `coder server --help`, and these environment variables are also passed
     # to the workspace provisioner (so you can consume them in your Terraform
     # templates for auth keys etc.).
     #
     # Please keep in mind that you should not set `CODER_HTTP_ADDRESS`,
     # `CODER_TLS_ENABLE`, `CODER_TLS_CERT_FILE` or `CODER_TLS_KEY_FILE` as
     # they are already set by the Helm chart and will cause conflicts.
     env:
       - name: CODER_PG_CONNECTION_URL
         valueFrom:
           secretKeyRef:
             # You'll need to create a secret called coder-db-url with your
             # Postgres connection URL like:
             # postgres://coder:password@postgres:5432/coder?sslmode=disable
             name: coder-db-url
             key: url
   
       # (Optional) For production deployments the access URL should be set.
       # If you're just trying Coder, access the dashboard via the service IP.
       - name: CODER_ACCESS_URL
         value: "https://coder.example.com"
   
     #tls:
     #  secretNames:
     #    - my-tls-secret-name
   

   You can view our Helm README for details on the values that are available, or you can view the values.yaml file directly.

6. Run the following command to install the chart in your cluster.

   helm install coder coder-v2/coder \
       --namespace coder \
       --values values.yaml
   

   You can watch Coder start up by running kubectl get pods -n coder. Once Coder has started, the coder-* pods should enter the Running state.

7. Log in to Coder

   Use kubectl get svc -n coder to get the IP address of the LoadBalancer. Visit this in the browser to set up your first account.

   If you do not have a domain, you should set CODER_ACCESS_URL to this URL in the Helm chart and upgrade Coder (see below). This allows workspaces to connect to the proper Coder URL.

Upgrading Coder via Helm

To upgrade Coder in the future or change values, you can run the following command:

helm repo update
helm upgrade coder coder-v2/coder \
  --namespace coder \
  -f values.yaml

Load balancing considerations

AWS

If you are deploying Coder on AWS EKS and service is set to LoadBalancer, AWS will default to the Classic load balancer. The load balancer external IP will be stuck in a pending status unless sessionAffinity is set to None.

coder:
  service:
    type: LoadBalancer
    sessionAffinity: None

AWS recommends a Network load balancer in lieu of the Classic load balancer. Use the following values.yaml settings to request a Network load balancer:

coder:
  service:
    externalTrafficPolicy: Local
    sessionAffinity: None
    annotations: { service.beta.kubernetes.io/aws-load-balancer-type: "nlb" }

By default, Coder will set the externalTrafficPolicy to Cluster which will mask client IP addresses in the Audit log. To preserve the source IP, you can either set this value to Local, or pass through the client IP via the X-Forwarded-For header. To configure the latter, set the following environment variables:

coder:
  env:
    - name: CODER_PROXY_TRUSTED_HEADERS
      value: X-Forwarded-For
    - name: CODER_PROXY_TRUSTED_ORIGINS
      value: 10.0.0.1/8 # this will be the CIDR range of your Load Balancer IP address

Azure

In certain enterprise environments, the Azure Application Gateway was needed. The Application Gateway supports:

• Websocket traffic (required for workspace connections)
• TLS termination

PostgreSQL Certificates

Your organization may require connecting to the database instance over SSL. To supply Coder with the appropriate certificates, and have it connect over SSL, follow the steps below:

1. Create the certificate as a secret in your Kubernetes cluster, if not already present:

$ kubectl create secret tls postgres-certs -n coder --key="postgres.key" --cert="postgres.crt"

1. Define the secret volume and volumeMounts in the Helm chart:

coder:
  volumes:
    - name: "pg-certs-mount"
      secret:
        secretName: "postgres-certs"
  volumeMounts:
    - name: "pg-certs-mount"
      mountPath: "$HOME/.postgresql"
      readOnly: true

1. Lastly, your PG connection URL will look like:

postgres://<user>:<password>@databasehost:<port>/<db-name>?sslmode=require&sslcert=$HOME/.postgresql/postgres.crt&sslkey=$HOME/.postgresql/postgres.key"

More information on connecting to PostgreSQL databases using certificates can be found here.

Troubleshooting

You can view Coder's logs by getting the pod name from kubectl get pods and then running kubectl logs <pod name>. You can also view these logs in your Cloud's log management system if you are using managed Kubernetes.

Kubernetes-based workspace is stuck in "Connecting..."

Ensure you have an externally-reachable CODER_ACCESS_URL set in your helm chart. If you do not have a domain set up, this should be the IP address of Coder's LoadBalancer (kubectl get svc -n coder).

See troubleshooting templates for more steps.

Next steps