K8S基础服务（apiserver、controller、scheduler、etcd）时区设置

一、PodPreset

使用PodPreset可以修改所有容器的时区（在pod 创建时,用户可以使用 podpreset 对象将特定信息注入 pod 中,这些信息可以包括 secret、 卷、 卷挂载和环境变量）

1.1、默认k8s是没有开启PodPreset的，开启PodPreset需要修改kube-apiserver的配置
1.2、添加一个–runtime-config=settings.k8s.io/v1alpha1=true或者–runtime-config=api/all=true
1.3、在–enable-admission-plugins的后面增加一个PodPreset

[root@k8s-singlenode-xxx manifests]# pwd
/etc/kubernetes/manifests
[root@k8s-singlenode-xxx manifests]# cat kube-apiserver.yaml 
apiVersion: v1
kind: Pod
metadata:
  annotations:
    kubeadm.kubernetes.io/kube-apiserver.advertise-address.endpoint: xxx.xxx.xxx.xxx:6443
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
  - command:
    - kube-apiserver
    - --advertise-address=100.64.22.23
    - --allow-privileged=true
    - --audit-log-format=json
    - --audit-log-maxage=7
    - --audit-log-maxbackup=10
    - --audit-log-maxsize=100
    - --audit-log-path=/var/log/kubernetes/audit.log
    - --audit-policy-file=/etc/kubernetes/audit-policy.yml
    - --authorization-mode=Node,RBAC
    - --client-ca-file=/etc/kubernetes/pki/ca.crt
    ##########变更配置位置#########
    - --enable-admission-plugins=NodeRestriction,PodPreset
    - --runtime-config=api/all=true
      #########变更配置位置##########
    - --enable-aggregator-routing=true
    - --enable-bootstrap-token-auth=true
    - --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
    - --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
    - --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
    - --etcd-servers=https://127.0.0.1:2379
    - --feature-gates=TTLAfterFinished=true,EphemeralContainers=true
    - --insecure-port=0
    - --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
    - --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
    - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
    - --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
    - --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
    - --requestheader-allowed-names=front-proxy-client
    - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
    - --requestheader-extra-headers-prefix=X-Remote-Extra-
    - --requestheader-group-headers=X-Remote-Group
    - --requestheader-username-headers=X-Remote-User
    - --secure-port=6443
    - --service-account-key-file=/etc/kubernetes/pki/sa.pub
    - --service-cluster-ip-range=10.96.0.0/22
    - --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key

1.4、创建Podpreset
yaml文件

apiVersion: settings.k8s.io/v1alpha1
kind: PodPreset
metadata:
  name: tz-env
spec:
  selector:
    matchLabels:
  env:
  - name: TZ
    value: Asia/Shanghai

1.4、podpreset只对当前名称空间生效
注意
Pod Preset是namespace级别的对象，其作用范围只能是同一个命名空间下容器
matchLabels为空代表选择所有

要为所有命名空间下配置可以执行脚本：

#!/bin/bash
namespaces=`kubectl get namespaces | awk 'NR>=2{print $1'}`
for namespace in $namespaces
do
kubectl apply -n $namespace -f pod-preset.yaml
done

二、通过本机挂载方式修改时区

2.1、etcd
/etc/kubernetes/manifests/etcd.yaml

    volumeMounts:
    - mountPath: /etc/localtime
      name: host-time
      readOnly: true
  volumes:
  - hostPath:
      path: /etc/localtime
      type: ""
    name: host-time

2.2、K8S组件
apiserver、controller、scheduler同上

/etc/kubernetes/manifests/kube-apiserver.yaml
/etc/kubernetes/manifests/kube-scheduler.yaml
/etc/kubernetes/manifests/kube-controller-manager.yaml

参考：https://blog.csdn.net/u010389826/article/details/132357697
参考：https://blog.csdn.net/sunnyliuqi/article/details/122323557