Command Cheat Sheet for TiDB Cluster Management

This document is an overview of the commands used for TiDB cluster management.

kubectl

View resources

• View CRD:

  kubectl get crd
  

• View TidbCluster:

  kubectl -n ${namespace} get tc ${name}
  

• View TidbMonitor:

  kubectl -n ${namespace} get tidbmonitor ${name}
  

• View Backup:

  kubectl -n ${namespace} get bk ${name}
  

• View BackupSchedule:

  kubectl -n ${namespace} get bks ${name}
  

• View Restore:

  kubectl -n ${namespace} get restore ${name}
  

• View TidbClusterAutoScaler:

  kubectl -n ${namespace} get tidbclusterautoscaler ${name}
  

• View TidbInitializer:

  kubectl -n ${namespace} get tidbinitializer ${name}
  

• View Advanced StatefulSet:

  kubectl -n ${namespace} get asts ${name}
  

• View a Pod:

  kubectl -n ${namespace} get pod ${name}
  

  View a TiKV Pod:

  kubectl -n ${namespace} get pod -l app.kubernetes.io/component=tikv
  

  View the continuous status change of a Pod:

  watch kubectl -n ${namespace} get pod
  

  View the detailed information of a Pod:

  kubectl -n ${namespace} describe pod ${name}
  

• View the node on which Pods are located:

  kubectl -n ${namespace} get pods -l "app.kubernetes.io/component=tidb,app.kubernetes.io/instance=${cluster_name}" -ojsonpath="{range .items[*]}{.spec.nodeName}{'\n'}{end}"
  

• View Service:

  kubectl -n ${namespace} get service ${name}
  

• View ConfigMap:

  kubectl -n ${namespace} get cm ${name}
  

• View a PersistentVolume (PV):

  kubectl -n ${namespace} get pv ${name}
  

  View the PV used by the cluster:

  kubectl get pv -l app.kubernetes.io/namespace=${namespace},app.kubernetes.io/managed-by=tidb-operator,app.kubernetes.io/instance=${cluster_name}
  

• View a PersistentVolumeClaim (PVC):

  kubectl -n ${namespace} get pvc ${name}
  

• View StorageClass:

  kubectl -n ${namespace} get sc
  

• View StatefulSet:

  kubectl -n ${namespace} get sts ${name}
  

  View the detailed information of StatefulSet:

  kubectl -n ${namespace} describe sts ${name}
  

Update resources

• Add an annotation for TiDBCluster:

  kubectl -n ${namespace} annotate tc ${cluster_name} ${key}=${value}
  

  Add a force-upgrade annotation for TiDBCluster:

  kubectl -n ${namespace} annotate --overwrite tc ${cluster_name} tidb.pingcap.com/force-upgrade=true
  

  Delete a force-upgrade annotation for TiDBCluster:

  kubectl -n ${namespace} annotate tc ${cluster_name} tidb.pingcap.com/force-upgrade-
  

  Enable the debug mode for Pods:

  kubectl -n ${namespace} annotate pod ${pod_name} runmode=debug
  

Edit resources

• Edit TidbCluster:

  kubectl -n ${namespace} edit tc ${name}
  

Patch Resources

• Patch TidbCluster:

  kubectl -n ${namespace} patch tc ${name} --type merge -p '${json_path}'
  

• Patch PV ReclaimPolicy:

  kubectl patch pv ${name} -p '{"spec":{"persistentVolumeReclaimPolicy":"Delete"}}'
  

• Patch a PVC:

  kubectl -n ${namespace} patch pvc ${name} -p '{"spec": {"resources": {"requests": {"storage": "100Gi"}}}'
  

• Patch StorageClass:

  kubectl patch storageclass ${name} -p '{"allowVolumeExpansion": true}'
  

Create resources

• Create a cluster using the YAML file:

  kubectl -n ${namespace} apply -f ${file}
  

• Create Namespace:

  kubectl create ns ${namespace}
  

• Create Secret:

  Create Secret of the certificate:

  kubectl -n ${namespace} create secret generic ${secret_name} --from-file=tls.crt=${cert_path} --from-file=tls.key=${key_path} --from-file=ca.crt=${ca_path}
  

  Create Secret of the user id and password:

  kubectl -n ${namespace} create secret generic ${secret_name} --from-literal=user=${user} --from-literal=password=${password}
  

Interact with running Pods

• View the PD configuration file:

  kubectl -n ${namespace} -it exec ${pod_name} -- cat /etc/pd/pd.toml
  

• View the TiDB configuration file:

  kubectl -n ${namespace} -it exec ${pod_name} -- cat /etc/tidb/tidb.toml
  

• View the TiKV configuration file:

  kubectl -n ${namespace} -it exec ${pod_name} -- cat /etc/tikv/tikv.toml
  

• View Pod logs:

  kubectl -n ${namespace} logs ${pod_name} -f
  

  View logs of the previous container:

  kubectl -n ${namespace} logs ${pod_name} -p
  

  If there are multiple containers in a Pod, view logs of one container:

  kubectl -n ${namespace} logs ${pod_name} -c ${container_name}
  

• Expose services:

  kubectl -n ${namespace} port-forward svc/${service_name} ${local_port}:${port_in_pod}
  

  Expose PD services:

  kubectl -n ${namespace} port-forward svc/${cluster_name}-pd 2379:2379
  

Interact with nodes

• Mark the node as non-schedulable:

  kubectl cordon ${node_name}
  

• Mark the node as schedulable:

  kubectl uncordon ${node_name}
  

Delete resources

• Delete a Pod:

  kubectl delete -n ${namespace} pod ${pod_name}
  

• Delete a PVC:

  kubectl delete -n ${namespace} pvc ${pvc_name}
  

• Delete TidbCluster:

  kubectl delete -n ${namespace} tc ${tc_name}
  

• Delete TidbMonitor:

  kubectl delete -n ${namespace} tidbmonitor ${tidb_monitor_name}
  

• Delete TidbClusterAutoScaler:

  kubectl -n ${namespace} delete tidbclusterautoscaler ${name}
  

More

See kubectl Cheat Sheet for more kubectl usage.

Helm

Add Helm repository

helm repo add pingcap https://charts.pingcap.org/

Update Helm repository

helm repo update

View available Helm chart

• View charts in Helm Hub:

  helm search hub ${chart_name}
  

  For example:

  helm search hub mysql
  

• View charts in other repositories:

  helm search repo ${chart_name} -l --devel
  

  For example:

  helm search repo tidb-operator -l --devel
  

Get the default values.yaml of the Helm chart

helm inspect values ${chart_name} --version=${chart_version} > values.yaml

For example:

helm inspect values pingcap/tidb-operator --version=v1.4.7 > values-tidb-operator.yaml

Deploy using Helm chart

helm install ${name} ${chart_name} --namespace=${namespace} --version=${chart_version} -f ${values_file}

For example:

helm install tidb-operator pingcap/tidb-operator --namespace=tidb-admin --version=v1.4.7 -f values-tidb-operator.yaml

View the deployed Helm release

helm ls

Update Helm release

helm upgrade ${name} ${chart_name} --version=${chart_version} -f ${values_file}

For example:

helm upgrade tidb-operator pingcap/tidb-operator --version=v1.4.7 -f values-tidb-operator.yaml

Delete Helm release

helm uninstall ${name} -n ${namespace}

For example:

helm uninstall tidb-operator -n tidb-admin

More

See Helm Commands for more Helm usage.