helm使用hostpath部署es

环境汇总：
k8s: v1.20.5
helm: v3.2.0
elasticsearch: 6.8.18

1.创建操作空间&前期准备

参考：快速搭建Kubernetes高可用集群七 ELKSTACK 部署 https://www.longger.net/article/33179.html

# 创建elk的namespace
kubectl create ns elk

# 拉取es镜像，后面需要获取证书
docker pull elasticsearch:6.8.18

## 生成证书
# 运行容器生成证书
$ docker run --name elastic-charts-certs -i -w /app elasticsearch:6.8.18 /bin/sh -c  \
  "elasticsearch-certutil ca --out /app/elastic-stack-ca.p12 --pass '' && \
    elasticsearch-certutil cert --name security-master --dns \
    security-master --ca /app/elastic-stack-ca.p12 --pass '' --ca-pass '' --out /app/elastic-certificates.p12"

# 从容器中将生成的证书拷贝出到当前目录
docker cp elastic-charts-certs:/app/elastic-certificates.p12 ./ 

# 删除容器
docker rm -f elastic-charts-certs

# 将 pcks12 中的信息分离出来，写入文件
openssl pkcs12 -nodes -passin pass:'' -in elastic-certificates.p12 -out elastic-certificate.pem

## 添加证书
kubectl create secret -n elk generic elastic-certificates --from-file=elastic-certificates.p12
kubectl -n elk create secret generic elastic-certificate-pem --from-file=elastic-certificate.pem

# 设置集群用户名密码，用户名不建议修改
kubectl create secret -n elk generic elastic-credentials \
  --from-literal=username=elastic --from-literal=password=elastic123456
  
# 查看生成的证书及秘钥库
kubectl get secret -n elk

2.helm拉取&更新repo

helm repo add elastic https://helm.elastic.co 
helm repo update

3.提前pull镜像

# elasticsearch
docker pull elasticsearch:6.8.18

docker tag elasticsearch:6.8.18 docker.elastic.co/elasticsearch/elasticsearch:6.8.18

# kibana
docker pull kibana:6.8.18

docker tag kibana:6.8.18 docker.elastic.co/kibana/kibana:6.8.18

4.使用hostpath作为local storage的存储卷

需先创建好pv, storageclass-master与data各自创建自己的pv

参考：PV、PVC、StorageClass讲解 https://www.cnblogs.com/rexcheny/p/10925464.html

pv-master节点

# local-pv-master1.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: es-master-pv1 # 多个master节点设置多个master的pv
spec:
  capacity:
    storage: 10Gi
  volumeMode: Filesystem
  accessModes:
  - ReadWriteOnce # hostpath下的读写特性，单节点读写
  persistentVolumeReclaimPolicy: Delete
  storageClassName: local-storage
  local: # local类型
    path: /mnt/data/master/vol01  # 节点上的具体路径，根据实际情况定
  nodeAffinity: # 这里就设置了节点亲和
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values:
          - node1 # 这里我们使用node1节点，该节点有/data/vol1路径

pv-data节点

# local-pv-data1.yaml
apiVersion: v1
kind: PersistentVolume
metadata:
  name: es-data-pv1 # 多个data节点设置多个data的pv
spec:
  capacity:
    storage: 100Gi # 大小根据请款设置，测试环境设的100G
  volumeMode: Filesystem
  accessModes:
  - ReadWriteOnce # hostpath下的读写特性，单节点读写
  persistentVolumeReclaimPolicy: Delete
  storageClassName: local-storage # 同storageclass的设置name一直
  local: # local类型
    path: /mnt/data  # 节点上的具体路径
  nodeAffinity: # 这里就设置了节点亲和
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname # 命令 kubectl get no --show-labels
          operator: In
          values:
          - node1 # 这里我们使用node01节点，该节点有/data/vol1路径

storageclass

# local-storageclass.yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: local-storage # 与pv的设置的name一致
provisioner: kubernetes.io/no-provisioner # 动态供给插件
volumeBindingMode: WaitForFirstConsumer

设置pv & storageclass

kubectl apply -f local-pv-master1[2|3].yaml -n elk # 在elk的namespace下
kubectl apply -f local-pv-data1[2|3].yaml -n elk # 在elk的namespace下
kubectl apply -f local-storageclass.yaml -n elk # 在elk的namespace下

5.准备helm安装节点的values yaml

参考：Helm 安装 ElasticSearch & Kibana 7.x 版本 http://www.mydlq.club/article/13

es-master

---
# 集群名称
clusterName: "helm"
# 节点所属群组
nodeGroup: "master"
# Master 节点的服务地址，这里是Master,不需要
masterService: ""
# 节点类型：
roles:
  master: "true"
  ingest: "false"
  data: "false"
# 节点数量，做为 Master 节点，数量必须是 node >=3 and node mod 2 == 1
replicas: 1 # 节点数量按情况设置，本人测试设置1，官方3
minimumMasterNodes: 1
esMajorVersion: ""
esConfig:
  # elasticsearch.yml 的配置，主要是数据传输和监控的开关及证书配置
  elasticsearch.yml: |
    xpack:
      security:
        enabled: true
        transport:
          ssl:
            enabled: true
            verification_mode: certificate
            keystore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
            truststore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
      monitoring:
        collection:
          enabled: true
# 设置 ES 集群的 elastic 账号密码为变量
extraEnvs:
  - name: ELASTIC_USERNAME
    valueFrom:
      secretKeyRef:
        name: elastic-credentials
        key: username
  - name: ELASTIC_PASSWORD
    valueFrom:
      secretKeyRef:
        name: elastic-credentials
        key: password
envFrom: []
# 挂载证书位置
secretMounts:
  - name: elastic-certificates
    secretName: elastic-certificates
    path: /usr/share/elasticsearch/config/certs
# 镜像拉取来源，我对镜像做了一些简单的修改，故放置于自建的 harbor 里。
image: "docker.elastic.co/elasticsearch/elasticsearch"
imageTag: "6.8.18"
imagePullPolicy: "IfNotPresent"
imagePullSecrets:
  - name: registry-secret
podAnnotations: {}
labels: {}
# ES 的 JVM 内存
esJavaOpts: "-Xmx512m -Xms512m" # 内存不要设太大，根据自己机器情况定，如果一致unready，建议512m
# ES 运行所需的资源
resources:
  requests:
    cpu: "500m"
    memory: "1Gi"
  limits:
    cpu: "500m"
    memory: "1Gi"
initResources: {}
sidecarResources: {}
# ES 的服务 IP,如果没有设置这个，服务有可能无法启动。
networkHost: "0.0.0.0"
# ES 的存储配置
volumeClaimTemplate:
  storageClassName: "local-storage" # 与前面的storageclass.yaml一致
  accessModes: [ "ReadWriteOnce" ]
  resources:
    requests:
      storage: 5Gi # 大小一致
# PVC 开关
persistence:
  enabled: true
  labels:
    enabled: false
  annotations: {}
# rbac 暂未详细研究
rbac:
  create: false
  serviceAccountAnnotations: {}
  serviceAccountName: ""
# 镜像部署选择节点
nodeSelector:
  kubernetes.io/hostname: node1
# 容忍污点，如果 K8S 集群节点较少，需要在 Master 节点部署，需要使用此项
tolerations:
  - operator: "Exists"

es-data

---
# 集群名称，必须和 Master 节点的集群名称保持一致
clusterName: "helm"
# 节点类型
nodeGroup: "data"
# Master 节点服务名称
masterService: "helm-master"
# 节点权限，为 True 的是提供相关服务，Data 节点不需要 Master 权限
roles:
  master: "false"
  ingest: "true"
  data: "true"
# 节点数量
replicas: 1  # 按实际情况设置，测试设为1，官方3
esMajorVersion: "6"
esConfig:
# elasticsearch.yml 配置，同 Master 节点配置
  elasticsearch.yml: |
    xpack:
      security:
        enabled: true
        transport:
          ssl:
            enabled: true
            verification_mode: certificate
            keystore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
            truststore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
      monitoring:
        collection:
          enabled: true
extraEnvs:
# 同 Master 节点配置
  - name: ELASTIC_USERNAME
    valueFrom:
      secretKeyRef:
        name: elastic-credentials
        key: username
  - name: ELASTIC_PASSWORD
    valueFrom:
      secretKeyRef:
        name: elastic-credentials
        key: password
envFrom: []
secretMounts:
# 证书挂载，同 Master 节点配置
  - name: elastic-certificates
    secretName: elastic-certificates
    path: /usr/share/elasticsearch/config/certs
image: "docker.elastic.co/elasticsearch/elasticsearch"
imageTag: "6.8.18"
imagePullPolicy: "IfNotPresent"
imagePullSecrets:
  - name: registry-secret
podAnnotations: {}
labels: {}
# ES节点的 JVM 内存分配，根据实际情况进行增加
esJavaOpts: "-Xmx512m -Xms512m"

# ES 运行所需的资源
resources:
  requests:
    cpu: "1000m"
    memory: "1Gi"
  limits:
    cpu: "1000m"
    memory: "1Gi"
initResources: {}
sidecarResources: {}
# ES 的服务 IP,如果没有设置这个，服务有可能无法启动。
networkHost: "0.0.0.0"

# ES 数据存储
volumeClaimTemplate:
  storageClassName: "local-storage"
  accessModes: [ "ReadWriteOnce" ]
  resources:
    requests:
      storage: 10Gi

# PVC 开关
persistence:
  enabled: true
  labels:
    enabled: false
  annotations: {}

# rbac 暂未详细研究
rbac:
  create: false
  serviceAccountAnnotations: {}
  serviceAccountName: ""
# 镜像部署选择节点
# nodeSelector:
#   elk-rolse: data
# 容忍污点，如果 K8S 集群节点较少，需要在 Master 节点部署，需要使用此项
tolerations:
  - operator: "Exists"

es-client

# ============设置集群名称============
## 设置集群名称
clusterName: "helm"
## 设置节点名称
nodeGroup: "client"
## 设置角色
roles:
  master: "false"
  ingest: "false"
  data: "false"
# Master 节点服务名称
masterService: "helm-master"

# ============镜像配置============
## 指定镜像与镜像版本
image: "docker.elastic.co/elasticsearch/elasticsearch"
imageTag: "6.8.18"
## 副本数
replicas: 1

# ============资源配置============
## JVM 配置参数
esJavaOpts: "-Xmx512m -Xms512m"
## 部署资源配置(生成环境一定要设置大些)
resources:
  requests:
    cpu: "1000m"
    memory: "2Gi"
  limits:
    cpu: "1000m"
    memory: "2Gi"
## 数据持久卷配置
persistence:
  enabled: false

# ============安全配置============
## 设置协议，可配置为 http、https
protocol: http
## 证书挂载配置，这里我们挂入上面创建的证书
secretMounts:
  - name: elastic-certificates
    secretName: elastic-certificates
    path: /usr/share/elasticsearch/config/certs
## 允许您在/usr/share/elasticsearch/config/中添加任何自定义配置文件,例如 elasticsearch.yml
## ElasticSearch 7.x 默认安装了 x-pack 插件，部分功能免费，这里我们配置下
## 下面注掉的部分为配置 https 证书，配置此部分还需要配置 helm 参数 protocol 值改为 https
esConfig:
  elasticsearch.yml: |
    xpack.security.enabled: true
    xpack.security.transport.ssl.enabled: true
    xpack.security.transport.ssl.verification_mode: certificate
    xpack.security.transport.ssl.keystore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
    xpack.security.transport.ssl.truststore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
    # xpack.security.http.ssl.enabled: true
    # xpack.security.http.ssl.truststore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12
    # xpack.security.http.ssl.keystore.path: /usr/share/elasticsearch/config/certs/elastic-certificates.p12    
## 环境变量配置，这里引入上面设置的用户名、密码 secret 文件
extraEnvs:
  - name: ELASTIC_USERNAME
    valueFrom:
      secretKeyRef:
        name: elastic-credentials # 与release namespace一致
        key: username
  - name: ELASTIC_PASSWORD
    valueFrom:
      secretKeyRef:
        name: elastic-credentials
        key: password

# ============Service 配置============
service:
  type: NodePort
  nodePort: "30200"

6.helm install pod

执行顺序：master>data>client
# master节点
helm install es-m -nelk -f es-master.yaml elastic/elasticsearch --version 6.8.18 --debug
# data节点
helm install es-d -nelk -f es-data.yaml elastic/elasticsearch --version 6.8.18 --debug
# client节点
helm install es-c -nelk -f es-client.yaml elastic/elasticsearch --version 6.8.18 --debug

7.查看状态及测试功能

# 查看pod的情况
watch kubectl get po -n elk -o wide
---
NAME            READY   STATUS    RESTARTS   AGE    IP             NODE    NOMINATED NODE   READINESS GATES
helm-client-0   1/1     Running   0          6h2m   10.233.96.81   node2   <none>           <none>
helm-data-0     1/1     Running   0          45m    10.233.96.84   node2   <none>           <none>
helm-master-0   1/1     Running   0          45m    10.233.90.89   node1   <none>           <none>
---

# 如pod一直pending或其他不正常状态，查看原因
kubectl describe po helm-data-0 -nelk # -n elk也可以

# 查看pod的日志
kubectl logs  helm-master-0 -nelk

8.问题汇总

8.1 pv pvc sc的设置

关于存储卷的分类：
- nfs
- ceph
- local volume

8.2 节点亲和性问题

节点的亲和性与反亲和性

8.3 es起来了但不是ready状态-jvm内存问题

openjdk提示useavx=2不支持本cpu问题