Configure cluster parameters

From v0.6.0, KubeBlocks supports kbcli cluster configure and kbcli cluster edit-config to configure parameters. The difference is that KubeBlocks configures parameters automatically with kbcli cluster configure but kbcli cluster edit-config provides a visualized way for you to edit parameters directly.

There are 3 types of parameters:

1. Environment parameters, such as GC-related parameters, PULSAR_MEM, and PULSAR_GC, changes will apply to all components;
2. Configuration parameters, such as zookeeper or bookies.conf configuration files, can be changed through env and changes restart the pod;
3. Dynamic parameters, such as configuration files in brokers.conf, broker supports two types of change modes: a. Parameter change requires a restart, such as zookeeperSessionExpiredPolicy; b. For parameters that support dynamic parameters, you can obtain a list of all dynamic parameters with pulsar-admin brokers list-dynamic-config.

note

pulsar-admin is a management tool built in the Pulsar cluster. You can log in to the corresponding pod with kubectl exec -it <pod-name> -- bash (pod-name can be checked by kubectl get pods command, and you can choose any pod with the word broker in its name ), and there are corresponding commands in the /pulsar/bin path of the pod. For more information about pulsar-admin, please refer to the official documentation.

View parameter information

View the current configuration file of a cluster.

kbcli cluster describe-config ppulsar-cluster  

• View the details of the current configuration file.

  kbcli cluster describe-config pulsar-cluster --show-detail

• View the parameter description.

  kbcli cluster explain-config pulsar-cluster | head -n 20

Configure parameters

Configure parameters with configure command

Configure environment parameters

Steps

1. You need to specify the component name to configure parameters. Get the pulsar cluster component name.

   kbcli cluster list-components pulsar-cluster 
   >
   NAME               NAMESPACE   CLUSTER   TYPE               IMAGE
   proxy              default     pulsar    pulsar-proxy       docker.io/apecloud/pulsar:2.11.2
   broker             default     pulsar    pulsar-broker      docker.io/apecloud/pulsar:2.11.2
   bookies-recovery   default     pulsar    bookies-recovery   docker.io/apecloud/pulsar:2.11.2
   bookies            default     pulsar    bookies            docker.io/apecloud/pulsar:2.11.2
   zookeeper          default     pulsar    zookeeper          docker.io/apecloud/pulsar:2.11.2

2. Configure parameters.

   We take zookeeper as an example.

   kbcli cluster configure pulsar-cluster --components=zookeeper --set PULSAR_MEM="-XX:MinRAMPercentage=50 -XX:MaxRAMPercentage=70" 

3. Verify the configuration.

   a. Check the progress of configuration:

   kubectl get ops 

   b. Check whether the configuration is done.

   kubectl get pod -l app.kubernetes.io/name=pulsar

Configure other parameters

The following steps take the configuration of dynamic parameter brokerShutdownTimeoutMs as an example.

Steps

1. Get configuration information.

   kbcli cluster desc-config pulsar-cluster --components=broker
   >
   ConfigSpecs Meta:
   CONFIG-SPEC-NAME         FILE                   ENABLED   TEMPLATE                   CONSTRAINT                   RENDERED                               COMPONENT   CLUSTER
   agamotto-configuration   agamotto-config.yaml   false     pulsar-agamotto-conf-tpl                                pulsar-broker-agamotto-configuration   broker      pulsar
   broker-env               conf                   true      pulsar-broker-env-tpl      pulsar-env-constraints       pulsar-broker-broker-env               broker      pulsar
   broker-config            broker.conf            true      pulsar-broker-config-tpl   brokers-config-constraints   pulsar-broker-broker-config            broker      pulsar

2. Configure parameters.

   kbcli cluster configure pulsar --components=broker --config-specs=broker-config --set brokerShutdownTimeoutMs=66600
   >
   Will updated configure file meta:
     ConfigSpec: broker-config          ConfigFile: broker.conf        ComponentName: broker        ClusterName: pulsar
   OpsRequest pulsar-reconfiguring-qxw8s created successfully, you can view the progress:
           kbcli cluster describe-ops pulsar-reconfiguring-qxw8s -n default

3. Check the progress of configuration.

   The ops name is printed with the command above.

   kbcli cluster describe-ops pulsar-cluster-reconfiguring-qxw8s -n default
   >
   Spec:
     Name: pulsar-cluster-reconfiguring-qxw8s        NameSpace: default        Cluster: pulsar        Type: Reconfiguring
   
   Command:
     kbcli cluster configure pulsar-cluster --components=broker --config-specs=broker-config --config-file=broker.conf --set brokerShutdownTimeoutMs=66600 --namespace=default
   
   Status:
     Start Time:         Jul 20,2023 09:53 UTC+0800
     Completion Time:    Jul 20,2023 09:53 UTC+0800
     Duration:           1s
     Status:             Succeed
     Progress:           2/2
                         OBJECT-KEY   STATUS   DURATION   MESSAGE

Configure parameters with edit-config command

For your convenience, KubeBlocks offers a tool edit-config to help you to configure parameter in a visualized way.

For Linux and macOS, you can edit configuration files by vi. For Windows, you can edit files on notepad.

1. Edit the configuration file.

   kbcli cluster edit-config pulsar-cluster
   note

   If there are multiple components in a cluster, use --components to specify a component.

2. View the status of the parameter configuration.

   kbcli cluster describe-ops xxx -n default

3. Connect to the database to verify whether the parameters are configured as expected.

   kbcli cluster connect pulsar-cluster
   note

   1. For the edit-config function, static parameters and dynamic parameters cannot be edited at the same time.
   2. Deleting a parameter will be supported later.

View history and compare differences

After the configuration is completed, you can search the configuration history and compare the parameter differences.

View the parameter configuration history.

kbcli cluster describe-config pulsar-cluster --components=zookeeper

From the above results, there are three parameter modifications.

Compare these modifications to view the configured parameters and their different values for different versions.

kbcli cluster diff-config pulsar-cluster-reconfiguring-qxw8s pulsar-cluster-reconfiguring-mwbnw