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| Original file line number | Diff line number | Diff line change |
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| --- | ||
| title: Deploy TiProxy Load Balancer for an Existing TiDB Cluster | ||
| summary: Learn how to deploy TiProxy for an existing TiDB cluster on Kubernetes. | ||
| --- | ||
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| # Deploy TiProxy Load Balancer for an Existing TiDB Cluster | ||
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| This topic describes how to deploy or remove the TiDB load balancer [TiProxy](https://docs.pingcap.com/tidb/v7.6/tiproxy-overview) for an existing TiDB cluster on Kubernetes. TiProxy is placed between the client and TiDB server to provide load balancing, connection persistence, and service discovery for TiDB. | ||
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| > **Note:** | ||
| > | ||
| > If you have not deployed a TiDB cluster, you can add TiProxy configurations when [configuring a TiDB cluster](configure-a-tidb-cluster.md) and then [deploy a TiDB cluster](deploy-on-general-kubernetes.md). In that case, you do not need to refer to this topic. | ||
| ## Deploy TiProxy | ||
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| If you need to deploy TiProxy for an existing TiDB cluster, follow these steps: | ||
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| > **Note:** | ||
| > | ||
| > If your server does not have access to the Internet, refer to [Deploy a TiDB Cluster](deploy-on-general-kubernetes.md#deploy-the-tidb-cluster) to download the `pingcap/tiproxy` Docker image to a machine with access to the Internet and then upload the Docker image to your server. Then, use `docker load` to install the Docker image on your server. | ||
| 1. Edit the TidbCluster Custom Resource (CR): | ||
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| ``` shell | ||
| kubectl edit tc ${cluster_name} -n ${namespace} | ||
| ``` | ||
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| 2. Add the TiProxy configuration as shown in the following example: | ||
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| ```yaml | ||
| spec: | ||
| tiproxy: | ||
| baseImage: pingcap/tiproxy | ||
| replicas: 3 | ||
| ``` | ||
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| 3. Configure the related parameters in `spec.tiproxy.config` of the TidbCluster CR. For example: | ||
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| ```yaml | ||
| spec: | ||
| tiproxy: | ||
| config: | ||
| config: | | ||
| [log] | ||
| level = "info" | ||
| ``` | ||
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| For more information about TiProxy configuration, see [TiProxy Configuration](https://docs.pingcap.com/tidb/v7.6/tiproxy/tiproxy-configuration). | ||
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| After TiProxy is started, you can find the corresponding `tiproxy-sql` load balancer service by running the following command. | ||
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| ``` shell | ||
| kubectl get svc -n ${namespace} | ||
| ``` | ||
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| ## Remove TiProxy | ||
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| If your TiDB cluster no longer needs TiProxy, follow these steps to remove it. | ||
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| 1. Modify `spec.tiproxy.replicas` to `0` to remove the TiProxy Pod by running the following command. | ||
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| ```shell | ||
| kubectl patch tidbcluster ${cluster_name} -n ${namespace} --type merge -p '{"spec":{"tiproxy":{"replicas": 0}}}' | ||
| ``` | ||
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| 2. Check the status of the TiProxy Pod. | ||
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| ```shell | ||
| kubectl get pod -n ${namespace} -l app.kubernetes.io/component=tiproxy,app.kubernetes.io/instance=${cluster_name} | ||
| ``` | ||
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| If the output is empty, the TiProxy Pod has been successfully removed. | ||
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| 3. Delete the TiProxy StatefulSet. | ||
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| 1. Modify the TidbCluster CR and delete the `spec.tiproxy` field by running the following command: | ||
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| ```shell | ||
| kubectl patch tidbcluster ${cluster_name} -n ${namespace} --type json -p '[{"op":"remove", "path":"/spec/tiproxy"}]' | ||
| ``` | ||
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| 2. Delete the TiProxy StatefulSet by running the following command: | ||
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| ```shell | ||
| kubectl delete statefulsets -n ${namespace} -l app.kubernetes.io/component=tiproxy,app.kubernetes.io/instance=${cluster_name} | ||
| ``` | ||
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| 3. Check whether the TiProxy StatefulSet has been successfully deleted by running the following command: | ||
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| ```shell | ||
| kubectl get sts -n ${namespace} -l app.kubernetes.io/component=tiproxy,app.kubernetes.io/instance=${cluster_name} | ||
| ``` | ||
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| If the output is empty, the TiProxy StatefulSet has been successfully deleted. |
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