Run Hasura GraphQL engine on Kubernetes¶
Table of contents
Introduction¶
This guide assumes that you already have Postgres running and helps you set up the Hasura GraphQL engine on Kubernetes and connect it to your Postgres database.
Deploying Hasura using Kubernetes¶
Step 1: Get the Kubernetes deployment and service files¶
The hasura/graphql-engine/install-manifests repo contains all installation manifests required to deploy Hasura anywhere. Get the Kubernetes deployment and service files from there:
$ wget https://raw.githubusercontent.com/hasura/graphql-engine/stable/install-manifests/kubernetes/deployment.yaml
$ wget https://raw.githubusercontent.com/hasura/graphql-engine/stable/install-manifests/kubernetes/svc.yaml
Step 2: Set the Postgres database url¶
Edit deployment.yaml
and set the right database url:
...
env:
- name: HASURA_GRAPHQL_DATABASE_URL
value: postgres://username:password@hostname:port/dbname
...
Examples of HASURA_GRAPHQL_DATABASE_URL
:
postgres://admin:password@localhost:5432/my-db
postgres://admin:@localhost:5432/my-db
(if there is no password)
Note
If your password contains special characters (e.g. #, %, $, @, etc.), you need to URL encode them in the
HASURA_GRAPHQL_DATABASE_URL
env var (e.g. %40 for @).You can check the logs to see if the database credentials are proper and if Hasura is able to connect to the database.
The Hasura GraphQL engine needs access permissions on your Postgres database as described in Postgres permissions.
Step 3: Create the Kubernetes deployment and service¶
$ kubectl create -f deployment.yaml
$ kubectl create -f svc.yaml
Step 4: Open the Hasura console¶
The above creates a LoadBalancer type service with port 80. So you should be able to access the console at the external IP.
For example, using Docker-for-desktop on Mac:
$ kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
hasura LoadBalancer 10.96.214.240 localhost 80:30303/TCP 4m
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 8m
Head to: http://localhost and the console should load!
Step 5: Track existing tables and relationships¶
See Setting up a GraphQL schema using an existing database to enable GraphQL over the database.
Securing the GraphQL endpoint¶
To make sure that your GraphQL endpoint and the Hasura console are not publicly accessible, you need to configure an admin secret key.
Add the HASURA_GRAPHQL_ADMIN_SECRET env var¶
Update the deployment.yaml
to set the HASURA_GRAPHQL_ADMIN_SECRET
environment variable.
...
spec:
containers:
...
command: ["graphql-engine"]
args: ["serve", "--enable-console"]
env:
- name: HASURA_GRAPHQL_DATABASE_URL
value: postgres://username:password@hostname:port/dbname
- name: HASURA_GRAPHQL_ADMIN_SECRET
value: mysecretkey
ports:
- containerPort: 8080
protocol: TCP
resources: {}
Note
The HASURA_GRAPHQL_ADMIN_SECRET
should never be passed from the client to the Hasura GraphQL engine as it would
give the client full admin rights to your Hasura instance. See Authentication & Authorization for information on
setting up authentication.
(optional) Use the admin secret key with the CLI¶
In case you’re using the CLI to open the Hasura console, use the admin-secret
flag when you open the console:
hasura console --admin-secret=myadminsecretkey
Hasura GraphQL engine server logs¶
You can check the logs of the Hasura GraphQL engine deployed on Kubernetes by checking the logs of the GraphQL engine
service, i.e. hasura
:
$ kubectl logs -f svc/hasura
{"timestamp":"2018-10-09T11:20:32.054+0000", "level":"info", "type":"http-log", "detail":{"status":200, "query_hash":"01640c6dd131826cff44308111ed40d7fbd1cbed", "http_version":"HTTP/1.1", "query_execution_time":3.0177627e-2, "request_id":null, "url":"/v1/graphql", "user":{"x-hasura-role":"admin"}, "ip":"127.0.0.1", "response_size":209329, "method":"POST", "detail":null}}
...
See:
- https://kubernetes.io/docs/concepts/cluster-administration/logging for more details on logging in Kubernetes.
- Hasura GraphQL engine logs for more details on Hasura logs
Updating Hasura GraphQL engine¶
This guide will help you update the Hasura GraphQL engine running on Kubernetes. This guide assumes that you already have the Hasura GraphQL engine running on Kubernetes.
Step 1: Check the latest release version¶
The current latest version is:
hasura/graphql-engine:latest
All the versions can be found at: https://github.com/hasura/graphql-engine/releases.
Step 2: Update the container image¶
In the deployment.yaml
file, update the image tag to this latest version.
For example, if you had:
containers:
- image: hasura/graphql-engine:v1.0.0-alpha01
you should change it to:
containers:
- image: hasura/graphql-engine:latest
Step 3: Rollout the change¶
$ kubectl replace -f deployment.yaml
Note
If you are downgrading to an older version of the GraphQL engine you might need to downgrade your metadata catalogue version as described in Downgrading Hasura GraphQL engine