Helm PV 问题检查

    参考 Helm:问题对应:缺少PV或者PV不足导致pod一直pending的对应方法

    https://kubernetes.feisky.xyz/concepts/objects/persistent-volume#volume-sheng-ming-zhou-qi

    以官网的 Quick Start 安装 MySQL Demo 为例

    安装 Mysql

    helm install bitnami/mysql --generate-name

    root@l2:~# helm install bitnami/mysql --generate-name
    NAME: mysql-1653818407
    LAST DEPLOYED: Sun May 29 18:00:11 2022
    NAMESPACE: default
    STATUS: deployed
    REVISION: 1
    TEST SUITE: None
    NOTES:
    CHART NAME: mysql
    CHART VERSION: 9.1.1
    APP VERSION: 8.0.29
    
    ** Please be patient while the chart is being deployed **
    
    Tip:
    
      Watch the deployment status using the command: kubectl get pods -w --namespace default
    
    Services:
    
      echo Primary: mysql-1653818407.default.svc.cluster.local:3306
    
    Execute the following to get the administrator credentials:
    
      echo Username: root
      MYSQL_ROOT_PASSWORD=$(kubectl get secret --namespace default mysql-1653818407 -o jsonpath="{.data.mysql-root-password}" | base64 --decode)
    
    To connect to your database:
    
      1. Run a pod that you can use as a client:
    
          kubectl run mysql-1653818407-client --rm --tty -i --restart='Never' --image  docker.io/bitnami/mysql:8.0.29-debian-10-r23 --namespace default --env MYSQL_ROOT_PASSWORD=$MYSQL_ROOT_PASSWORD --command -- bash
    
      2. To connect to primary service (read/write):
    
          mysql -h mysql-1653818407.default.svc.cluster.local -uroot -p"$MYSQL_ROOT_PASSWORD"
    

    检测 helm mysql 状态 helm ls 已经 deploy

    root@l2:~# helm ls
    NAME                    NAMESPACE       REVISION        UPDATED                                 STATUS          CHART           APP VERSION
    mysql-1653818407        default         1               2022-05-29 18:00:11.948612292 +0800 CST deployed        mysql-9.1.1     8.0.29     
    

    检测 pods 状态. kubectl get pods 一直在 pending

    root@l2:~# kubectl get pods
    NAME                                READY   STATUS    RESTARTS   AGE
    mysql-1653818407-0                  0/1     Pending   0          69s
    nginx-deployment-5d59d67564-2njn5   1/1     Running   0          3h45m
    nginx-deployment-5d59d67564-bxmvz   1/1     Running   0          3h45m
    

    检测 pods 详细信息. kubectl describe pods mysql-1653818407-0

    root@l2:~# kubectl describe pods mysql-1653818407-0
    Name:           mysql-1653818407-0
    Namespace:      default
    Priority:       0
    Node:           <none>
    Labels:         app.kubernetes.io/component=primary
                    app.kubernetes.io/instance=mysql-1653818407
                    app.kubernetes.io/managed-by=Helm
                    app.kubernetes.io/name=mysql
                    controller-revision-hash=mysql-1653818407-99f56b499
                    helm.sh/chart=mysql-9.1.1
                    statefulset.kubernetes.io/pod-name=mysql-1653818407-0
    Annotations:    checksum/configuration: 5f2e6634a70542ab714fcd83f049db0bac4249e8fbd85f5325315fcf54c3e940
    Status:         Pending
    IP:             
    IPs:            <none>
    Controlled By:  StatefulSet/mysql-1653818407
    Containers:
      mysql:
        Image:      docker.io/bitnami/mysql:8.0.29-debian-10-r23
        Port:       3306/TCP
        Host Port:  0/TCP
        Liveness:   exec [/bin/bash -ec password_aux="${MYSQL_ROOT_PASSWORD:-}"
    if [[ -f "${MYSQL_ROOT_PASSWORD_FILE:-}" ]]; then
        password_aux=$(cat "$MYSQL_ROOT_PASSWORD_FILE")
    fi
    mysqladmin status -uroot -p"${password_aux}"
    ] delay=5s timeout=1s period=10s #success=1 #failure=3
        Readiness:  exec [/bin/bash -ec password_aux="${MYSQL_ROOT_PASSWORD:-}"
    if [[ -f "${MYSQL_ROOT_PASSWORD_FILE:-}" ]]; then
        password_aux=$(cat "$MYSQL_ROOT_PASSWORD_FILE")
    fi
    mysqladmin status -uroot -p"${password_aux}"
    ] delay=5s timeout=1s period=10s #success=1 #failure=3
        Startup:  exec [/bin/bash -ec password_aux="${MYSQL_ROOT_PASSWORD:-}"
    if [[ -f "${MYSQL_ROOT_PASSWORD_FILE:-}" ]]; then
        password_aux=$(cat "$MYSQL_ROOT_PASSWORD_FILE")
    fi
    mysqladmin status -uroot -p"${password_aux}"
    ] delay=15s timeout=1s period=10s #success=1 #failure=10
        Environment:
          BITNAMI_DEBUG:        false
          MYSQL_ROOT_PASSWORD:  <set to the key 'mysql-root-password' in secret 'mysql-1653818407'>  Optional: false
          MYSQL_DATABASE:       my_database
        Mounts:
          /bitnami/mysql from data (rw)
          /opt/bitnami/mysql/conf/my.cnf from config (rw,path="my.cnf")
          /var/run/secrets/kubernetes.io/serviceaccount from mysql-1653818407-token-twpqk (ro)
    Conditions:
      Type           Status
      PodScheduled   False 
    Volumes:
      data:
        Type:       PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
        ClaimName:  data-mysql-1653818407-0
        ReadOnly:   false
      config:
        Type:      ConfigMap (a volume populated by a ConfigMap)
        Name:      mysql-1653818407
        Optional:  false
      mysql-1653818407-token-twpqk:
        Type:        Secret (a volume populated by a Secret)
        SecretName:  mysql-1653818407-token-twpqk
        Optional:    false
    QoS Class:       BestEffort
    Node-Selectors:  <none>
    Tolerations:     node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
                     node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
    Events:
      Type     Reason            Age                  From               Message
      ----     ------            ----                 ----               -------
      Warning  FailedScheduling  62s (x4 over 3m12s)  default-scheduler  0/3 nodes are available: 3 pod has unbound immediate PersistentVolumeClaims.
    

    检测 pvc 状态 kubectl get pvc

    root@l2:~# kubectl get pvc
    NAME                      STATUS    VOLUME   CAPACITY   ACCESS MODES   STORAGECLASS   AGE
    data-mysql-1653818407-0   Pending                                                     5m57s
    

    进一步确认 mysql pvc 状态 kubectl describe pvc data-mysql-1653818407-0

    root@l2:~# kubectl describe pvc data-mysql-1653818407-0 
    Name:          data-mysql-1653818407-0
    Namespace:     default
    StorageClass:  
    Status:        Pending
    Volume:        
    Labels:        app.kubernetes.io/component=primary
                   app.kubernetes.io/instance=mysql-1653818407
                   app.kubernetes.io/name=mysql
    Annotations:   <none>
    Finalizers:    [kubernetes.io/pvc-protection]
    Capacity:      
    Access Modes:  
    VolumeMode:    Filesystem
    Mounted By:    mysql-1653818407-0
    Events:
      Type    Reason         Age                   From                         Message
      ----    ------         ----                  ----                         -------
      Normal  FailedBinding  22s (x26 over 6m34s)  persistentvolume-controller  no persistent volumes available for this claim and no storage class is set
    

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