Review how the Gloo management server backs up data and your setup options to make the backing database more resilient. For more information about the feature, see Relay architecture.
What data gets stored
The Gloo snapshot that the agent sends to the management server is stored in the management server's backing storage. For an example of how to check the data that gets stored, see Review data in Redis.
- Discovered Kubernetes resources, such as Kubernetes services, deployments, replicasets, daemonsets, and statefulsets. The management server translates discovered resources into Istio resources and displays them in the Gloo UI. Note that you can use Istio discovery selectors to ignore certain Kubernetes resources. Ignored resources are not included in the snapshot that is sent from the agent to the management server.
- Gloo custom resources that you create. The management server translates Gloo resources into Istio resources and displays them in the Gloo UI.
- Istio resources, including:
- Istio resources that, after initial server-agent setup, the management server automatically translates from your Gloo resources and writes back to the workload cluster. These resources are included in the snapshot to avoid accidentally deleting them from the workload cluster if an agent disconnects and reconnects, and to display them in the Gloo UI.
- Any Istio resources that you manually created, so that they can be displayed in the Gloo UI.
- Internal resources that are computed in memory by each agent and pushed to the management server without being persisted in the workload cluster. Internal resources include:
Gatewayresources, which contain information about gateway endpoints in the cluster.
CertificateRequestresources, which are used in internal multi-step workflows that involve both the agent and the management server.
Backing storage options
Review the following options for setting up backing storage.
|Built-in local Redis||Proof of concept and staging environments||
|Bring your own Redis||Production environments||
Built-in local Redis
By default, a local Redis instance
gloo-mesh-redis is set up in the
gloo-mesh namespace of the management cluster when you install the Gloo management server and UI components. The Gloo management server replicas and the Gloo UI are automatically configured to read from and write data to this Redis instance for a global view of your Gloo environment.
Using a local Redis instance is not a recommended practice for production. To achieve higher availability, disaster recovery and add other security features, bring your own Redis instance instead.
To enable the local Redis, you use the following Helm values during the Gloo management server installation:
redis: deployment: # Enable the creation of the local Redis deployment and service. enabled: true
You can further configure the default Redis values, such as to modify the Kubernetes deployment's resource limits and requests. For more information, see the following docs:
- Check the Helm reference for the
- Follow the Upgrade guide for instructions on how to upgrade your installation after modifying the Helm fields.
Bring your own Redis
Instead of using the built-in local Redis instance, you can achieve higher availability, disaster recovery, and enhanced control and security by bringing your own Redis cluster. You can choose between installing the Redis cluster within the Gloo management cluster and run it alongside the Gloo UI and Gloo management server, or to use a Redis cluster that is hosted outside the management cluster, such as by using a cloud provider service like AWS ElastiCache.
When you bring your own Redis cluster, you can customize the following aspects:
- Authentication: To authenticate with your Redis instance, you can configure Gloo Gateway to use a username and password when connecting to Redis. Depending on your Redis provider, you might only need to specify a password to authenticate with Redis. You store these credentials in a Kubernetes secret on the management cluster.
- TLS certificates: For enhanced security, you can use TLS certificates to authenticate with your Redis cluster. Note that your Redis instance must be configured to accept TLS connections. You store the certificate that you want to use in a Kubernetes secret on the management cluster.
- Connection: You can optionally set connection parameters, such as the maximum number of active connections, retries, or number of idle connections.
- Database: You can optionally specify the database instance within your Redis cluster that you want to connect to.
Keep in mind that by bringing your own Redis instance, you configure both the Gloo management server and Gloo UI to read from and write to the same Redis database. Any settings for your Redis instance, such as the maximum number of retries, are shared between these components.
Create or use an existing Redis cluster, such as AWS ElastiCache, and make sure that you can connect to your instance from the Gloo management cluster. For example, if the cluster is behind a firewall, you might need to add the public IP address of the Redis cluster to your allowlist.
Choose how to authenticate with your Redis cluster. Depending on your Redis provider, you might be required to use a specific authentication method, such as TLS certificates or a username and password.
Create a Kubernetes secret to store your credentials.
- Username and password:
kubectl apply --context $MGMT_CONTEXT -f- <<EOF apiVersion: v1 kind: Secret type: Opaque metadata: name: redis-auth-secrets namespace: gloo-mesh data: username: "<username>" password: "<password>" EOF
- TLS certificates:
kubectl apply --context $MGMT_CONTEXT -f- <<EOF apiVersion: v1 kind: Secret type: Opaque metadata: name: "redis-certs" namespace: gloo-mesh data: redis.crt: "<TLS_certificate>"
- Username and password:
Follow the Upgrade guide to get your Gloo Platform Helm installation configuration file.
In your Helm values file, add the following information:
redis.address: The address to use to connect to your Redis cluster.
redis.auth: Add this section if you want to authenticate with your Redis cluster by using a username and password. To authenticate by using TLS certificates, remove this section and configure
redis.certs: Add this section if you want to authenticate with your Redis cluster by using TLS certificates. To authenticate by using a username and password, remove this section and configure
redis.connection: You can optionally override the default connection settings, such as the maximum number of retries.
redis.db: You can optionally override the index to connect to a specific database in the Redis cluster.
redis.deployment.enabled: Set this option to
falseto disable the built-in local Redis deployment.
redis.deployment: If you used the local Redis deployment before and customized the deployment, remove any custom settings in the
redis: # Address to use when connecting to the Redis instance. To use the default Redis deployment, specify 'redis.gloo-mesh.svc.cluster.local:6379'. address: gloo-mesh-redis.gloo-mesh:6379 # Optional authentication values to use when connecting to the Redis instance auth: # Connect to the Redis instance with a password enabled: false # The secret key containing the password to use for authentication passwordKey: password # Name of the k8s secret that contains the password secretName: redis-auth-secrets # The secret key containing the username to use for authentication usernameKey: username # Configuration for TLS verification when connecting to the Redis instance certs: # File name that contains the ca cert caCert: redis.crt # Enable a secure network connection to the Redis instance via TLS enabled: false # Name of the k8s secret that contains the certs secretName: redis-certs # Optional connection parameters connection: # Dial timeout for establishing new connections. Default is 5 seconds. dialTimeout: 5s # Frequency of idle checks made by idle connections reaper. Default is 1 minute. -1 disables idle connections reaper, but idle connections are still discarded by the client if IdleTimeout is set. idleCheckFrequency: 1m0s # Amount of time after which client closes idle connections. Should be less than server's timeout. Default is 5 minutes. -1 disables idle timeout check. idleTimeout: 5m0s # Connection age at which client retires (closes) the connection. Default is to not close aged connections. maxConnAge: "" # Maximum number of retries before giving up. Default is 3. -1 disables retries. maxRetries: 3 # Maximum backoff between each retry. Default is 512 milliseconds. -1 disables backoff. maxRetryBackoff: 512ms # Minimum number of idle connections which is useful when establishing new connection is slow. minIdleConns: 0 # Minimum backoff between each retry. Default is 8 milliseconds. -1 disables backoff. minRetryBackoff: 8ms # Type of connection pool. true for FIFO pool. false for LIFO pool. Note that FIFO has higher overhead compared to LIFO. poolFifo: false # Maximum number of socket connections. Default is 10 connections per every available CPU as reported by runtime.GOMAXPROCS. poolSize: 0 # Amount of time client waits for connection if all connections are busy before returning an error. Default is ReadTimeout + 1 second. poolTimeout: "" # Timeout for socket reads. if reached, commands will fail with a timeout instead of blocking. Default is 3 seconds. -1 disables timeout. 0 uses the default value. readTimeout: 3s # Timeout for socket writes. If reached, commands will fail with a timeout instead of blocking. Default is ReadTimeout. writeTimeout: "" # DB to connect to db: 0 deployment: # Enable creation of the deployment/service. enabled: false
Continue with the Upgrade guide to reinstall Gloo Gateway with your own Redis instance.