干货 | TiDB Operator实践

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原创 2019-06-11 14:11:46 1.1k 阅读 AI 写同款· GEO 优化 ›

K8s和TiDB都是目前开源社区中活跃的开源产品，TiDB
Operator项目是一个在K8s上编排管理TiDB集群的项目。本文详细记录了部署K8s及install TiDB
Operator的详细实施过程，希望能对刚"入坑"的同学有所帮助。

一、环境

Ubuntu 16.04
K8s 1.14.1

二、Kubespray安装K8s

配置免密登录

 yum -y install expect

vi /tmp/autocopy.exp

      #!/usr/bin/expect
     
      set timeout
      set user_hostname [lindex $argv ]
      set password [lindex $argv ]
      spawn ssh-copy-id $user_hostname
         expect {
             "(yes/no)?"
             {
                send "yes\n"
               expect "*assword:" { send "$password\n"}
            }
            "*assword:"
            {
                send "$password\n"
            }
        }
     expect eof

  ssh-keyscan addedip  >> ~/.ssh/known_hosts
 
  ssh-keygen -t rsa -P ''
 
  for i in 10.0.0.{31,32,33,40,10,20，50}; do  ssh-keyscan $i  >> ~/.ssh/known_hosts ; done
 
  /tmp/autocopy.exp root@addeip
  ssh-copy-id addedip
 
 /tmp/autocopy.exp root@10.0.0.31
 /tmp/autocopy.exp root@10.0.0.32
 /tmp/autocopy.exp root@10.0.0.33
 /tmp/autocopy.exp root@10.0.0.40
 /tmp/autocopy.exp root@10.0.0.10
 /tmp/autocopy.exp root@10.0.0.20
 /tmp/autocopy.exp root@10.0.0.50

配置Kubespray

 pip install -r requirements.txt
 cp -rfp inventory/sample inventory/mycluster

inventory/mycluster/inventory.ini
inventory/mycluster/inventory.ini

      # ## Configure 'ip' variable to bind kubernetes services on a
      # ## different ip than the default iface
      # ## We should set etcd_member_name for etcd cluster. The node that is not a etcd member do not need to set the value, or can set the empty string value.
      [all]
      # node1 ansible_host=95.54.0.12  # ip=10.3.0.1 etcd_member_name=etcd1
      # node2 ansible_host=95.54.0.13  # ip=10.3.0.2 etcd_member_name=etcd2
      # node3 ansible_host=95.54.0.14  # ip=10.3.0.3 etcd_member_name=etcd3
      # node4 ansible_host=95.54.0.15  # ip=10.3.0.4 etcd_member_name=etcd4
      # node5 ansible_host=95.54.0.16  # ip=10.3.0.5 etcd_member_name=etcd5
     # node6 ansible_host=95.54.0.17  # ip=10.3.0.6 etcd_member_name=etcd6
     etcd1 ansible_host=10.0.0.31 etcd_member_name=etcd1
     etcd2 ansible_host=10.0.0.32 etcd_member_name=etcd2
     etcd3 ansible_host=10.0.0.33 etcd_member_name=etcd3
     master1 ansible_host=10.0.0.40
     node1 ansible_host=10.0.0.10
     node2 ansible_host=10.0.0.20
     node3 ansible_host=10.0.0.50
    
     # ## configure a bastion host if your nodes are not directly reachable
     # bastion ansible_host=x.x.x.x ansible_user=some_user
    
     [kube-master]
     # node1
     # node2
     master1
     [etcd]
     # node1
     # node2
     # node3
     etcd1
     etcd2
     etcd3
    
     [kube-node]
     # node2
     # node3
     # node4
     # node5
     # node6
     node1
     node2
     node3
    
     [k8s-cluster:children]
     kube-master
     kube-node

节点所需镜像的文件

由于某些镜像国内无法访问需要现将镜像通过代理下载到本地然后上传到本地镜像仓库或DockerHub，同时修改配置文件，个别组件存放位置https://storage.googleapis.com，需要新建Nginx服务器分发文件。

* 建立Nginx服务器 *

~/distribution/docker-compose.yml
创建文件目录及Nginx配置文件目录
~/distribution/conf.d/open_distribute.conf
启动
下载并上传所需文件具体版本号参考roles/download/defaults/main.yml文件中kubeadm_version、kube_version、image_arch参数
安装Docker及Docker-Compose

  apt-get install \
  apt-transport-https \
  ca-certificates \
  curl \
  gnupg-agent \
  software-properties-common
 
  curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
 
 add-apt-repository \
 "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
 $(lsb_release -cs) \
 stable"

 apt-get update

 apt-get install docker-ce docker-ce-cli containerd.io

 chmod +x /usr/local/bin/docker-compose
 sudo curl -L "https://github.com/docker/compose/releases/download/1.24.0/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose

新建Nginx docker-compose.yml

 mkdir ~/distribution
 vi ~/distribution/docker-compose.yml

  #  distribute
  version: '2'
  services:    
     distribute:
         image: nginx:1.15.12
         volumes:
             - ./conf.d:/etc/nginx/conf.d
             - ./distributedfiles:/usr/share/nginx/html
         network_mode: "host"
        container_name: nginx_distribute

 mkdir ~/distribution/distributedfiles
 mkdir ~/distribution/
 mkdir ~/distribution/conf.d
 vi ~/distribution/conf.d/open_distribute.conf

  #open_distribute.conf
 
  server {
     #server_name distribute.search.leju.com;
         listen 8888;
 
     root /usr/share/nginx/html;
 
     add_header Access-Control-Allow-Origin *;  
    add_header Access-Control-Allow-Headers X-Requested-With;  
    add_header Access-Control-Allow-Methods GET,POST,OPTIONS;  

    location / {
    #    index index.html;
                autoindex on;        
    }
    expires off;
    location ~ .*\.(gif|jpg|jpeg|png|bmp|swf|eot|ttf|woff|woff2|svg)$ {
        expires -1;
    }

    location ~ .*\.(js|css)?$ {
        expires -1 ;
    }
 } # end of public static files domain : [ distribute.search.leju.com ]

 docker-compose up -d

 wget https://storage.googleapis.com/kubernetes-release/release/v1.14.1/bin/linux/amd64/kubeadm

 scp /tmp/kubeadm  10.0.0.60:/root/distribution/distributedfiles

 wget https://storage.googleapis.com/kubernetes-release/release/v1.14.1/bin/linux/amd64/hyperkube

需要下载并上传到私有仓库的镜像

  docker pull k8s.gcr.io/cluster-proportional-autoscaler-amd64:1.4.0
  docker tag k8s.gcr.io/cluster-proportional-autoscaler-amd64:1.4.0 jiashiwen/cluster-proportional-autoscaler-amd64:1.4.0
  docker push jiashiwen/cluster-proportional-autoscaler-amd64:1.4.0
 
  docker pull k8s.gcr.io/k8s-dns-node-cache:1.15.1
  docker tag k8s.gcr.io/k8s-dns-node-cache:1.15.1 jiashiwen/k8s-dns-node-cache:1.15.1
  docker push jiashiwen/k8s-dns-node-cache:1.15.1
 
  docker pull gcr.io/google_containers/pause-amd64:3.1
 docker tag gcr.io/google_containers/pause-amd64:3.1 jiashiwen/pause-amd64:3.1
 docker push jiashiwen/pause-amd64:3.1

 docker pull gcr.io/google_containers/kubernetes-dashboard-amd64:v1.10.1
 docker tag gcr.io/google_containers/kubernetes-dashboard-amd64:v1.10.1 jiashiwen/kubernetes-dashboard-amd64:v1.10.1
 docker push jiashiwen/kubernetes-dashboard-amd64:v1.10.1

 docker pull gcr.io/google_containers/kube-apiserver:v1.14.1
 docker tag gcr.io/google_containers/kube-apiserver:v1.14.1 jiashiwen/kube-apiserver:v1.14.1
 docker push jiashiwen/kube-apiserver:v1.14.1

 docker pull gcr.io/google_containers/kube-controller-manager:v1.14.1
 docker tag gcr.io/google_containers/kube-controller-manager:v1.14.1 jiashiwen/kube-controller-manager:v1.14.1
 docker push jiashiwen/kube-controller-manager:v1.14.1

 docker pull gcr.io/google_containers/kube-scheduler:v1.14.1
 docker tag gcr.io/google_containers/kube-scheduler:v1.14.1 jiashiwen/kube-scheduler:v1.14.1
 docker push jiashiwen/kube-scheduler:v1.14.1

 docker pull gcr.io/google_containers/kube-proxy:v1.14.1
 docker tag gcr.io/google_containers/kube-proxy:v1.14.1 jiashiwen/kube-proxy:v1.14.1
 docker push jiashiwen/kube-proxy:v1.14.1

  docker pull gcr.io/google_containers/pause:3.1
 docker tag gcr.io/google_containers/pause:3.1 jiashiwen/pause:3.1
 docker push jiashiwen/pause:3.1

 docker pull gcr.io/google_containers/coredns:1.3.1
 docker tag gcr.io/google_containers/coredns:1.3.1 jiashiwen/coredns:1.3.1
 docker push  jiashiwen/coredns:1.3.1

用于下载上传镜像的脚本

  #!/bin/bash
 
  privaterepo=jiashiwen
 
  k8sgcrimages=(
  cluster-proportional-autoscaler-amd64:1.4.0
  k8s-dns-node-cache:1.15.1
  )
 
 gcrimages=(
 pause-amd64:3.1
 kubernetes-dashboard-amd64:v1.10.1
 kube-apiserver:v1.14.1
 kube-controller-manager:v1.14.1
 kube-scheduler:v1.14.1
 kube-proxy:v1.14.1
 pause:3.1
 coredns:1.3.1
 )


 for k8sgcrimageName in ${k8sgcrimages[@]} ; do
 echo $k8sgcrimageName
 docker pull k8s.gcr.io/$k8sgcrimageName
 docker tag k8s.gcr.io/$k8sgcrimageName $privaterepo/$k8sgcrimageName
 docker push $privaterepo/$k8sgcrimageName
 done


 for gcrimageName in ${gcrimages[@]} ; do
 echo $gcrimageName
 docker pull gcr.io/google_containers/$gcrimageName
 docker tag gcr.io/google_containers/$gcrimageName $privaterepo/$gcrimageName
 docker push $privaterepo/$gcrimageName
 done

修改文件inventory/mycluster/group_vars/k8s-cluster/k8s-cluster.yml，修改K8s镜像仓库

 # kube_image_repo: "gcr.io/google-containers"
 kube_image_repo: "jiashiwen"

修改roles/download/defaults/main.yml

  #dnsautoscaler_image_repo: "k8s.gcr.io/cluster-proportional-autoscaler-{{   image_arch }}"
  dnsautoscaler_image_repo: "jiashiwen/cluster-proportional-autoscaler-{{   image_arch }}"
 
  #kube_image_repo: "gcr.io/google-containers"
  kube_image_repo: "jiashiwen"
 
  #pod_infra_image_repo: "gcr.io/google_containers/pause-{{ image_arch }}"
  pod_infra_image_repo: "jiashiwen/pause-{{ image_arch }}"
 
 #dashboard_image_repo: "gcr.io/google_containers/kubernetes-dashboard-{{   image_arch }}"
 dashboard_image_repo: "jiashiwen/kubernetes-dashboard-{{ image_arch }}"

 #nodelocaldns_image_repo: "k8s.gcr.io/k8s-dns-node-cache"
 nodelocaldns_image_repo: "jiashiwen/k8s-dns-node-cache"

 #kubeadm_download_url: "https://storage.googleapis.com/kubernetes-release/  release/{{ kubeadm_version }}/bin/linux/{{ image_arch }}/kubeadm"
 kubeadm_download_url: "http://10.0.0.60:8888/kubeadm"

 #hyperkube_download_url: "https://storage.googleapis.com/  kubernetes-release/release/{{ kube_version }}/bin/linux/{{ image_arch }}/  hyperkube"
 hyperkube_download_url: "http://10.0.0.60:8888/hyperkube"

三、执行安装

安装命令

 ansible-playbook -i inventory/mycluster/inventory.ini cluster.yml

重置命令

 ansible-playbook -i inventory/mycluster/inventory.ini reset.yml

四、验证K8s集群

*安装Kubectl*

本地浏览器打开https://storage.googleapis.com/kubernetes-release/release/stable.txt得到最新版本为v1.14.1
用上一步得到的最新版本号v1.7.1替换下载地址中的$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)得到真正的下载地址https:// storage.googleapis.com/kubernetes-release/release/v1.14.1/bin/linux/amd64/kubectl
上传下载好的kubectl

scp /tmp/kubectl root@xxx:/root

修改属性

 chmod +x ./kubectl
 mv ./kubectl /usr/local/bin/kubectl

Ubuntu

 sudo snap install kubectl --classic

CentOS
将master节点上的~/.kube/config 文件复制到你需要访问集群的客户端上即可

 scp 10.0.0.40:/root/.kube/config ~/.kube/config

执行命令验证集群

 kubectl get nodes
 kubectl cluster-info

五、TiDB-Operaor部署

安装helm

https://blog.youkuaiyun.com/bbwangj/article/details/81087911

安装helm

 curl https://raw.githubusercontent.com/helm/helm/master/scripts/get > get_helm.sh
 chmod 700 get_helm.sh
 ./get_helm.sh

查看helm版本

 helm version

初始化

 helm init --upgrade -i registry.cn-hangzhou.aliyuncs.com/google_containers/tiller:v2.13.1 --stable-repo-url https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts

为K8s提供 local volumes

参考文档https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner/blob/master/docs/operations.md
tidb-operator启动会为pd和tikv绑定pv，需要在discovery directory下创建多个目录
格式化并挂载磁盘

 mkfs.ext4 /dev/vdb
 DISK_UUID=$(blkid -s UUID -o value /dev/vdb) 
 mkdir /mnt/$DISK_UUID
 mount -t ext4 /dev/vdb /mnt/$DISK_UUID

/etc/fstab持久化mount

 echo UUID=`sudo blkid -s UUID -o value /dev/vdb` /mnt/$DISK_UUID ext4 defaults 0 2 | sudo tee -a /etc/fstab

创建多个目录并mount到discovery directory

 for i in $(seq 1 10); do
 sudo mkdir -p /mnt/${DISK_UUID}/vol${i} /mnt/disks/${DISK_UUID}_vol${i}
 sudo mount --bind /mnt/${DISK_UUID}/vol${i} /mnt/disks/${DISK_UUID}_vol${i}
 done

/etc/fstab持久化mount

 for i in $(seq 1 10); do
 echo /mnt/${DISK_UUID}/vol${i} /mnt/disks/${DISK_UUID}_vol${i} none bind 0 0 | sudo tee -a /etc/fstab
 done

为tidb-operator创建local-volume-provisioner

 $ kubectl apply -f https://raw.githubusercontent.com/pingcap/tidb-operator/master/manifests/local-dind/local-volume-provisioner.yaml
 $ kubectl get po -n kube-system -l app=local-volume-provisioner
 $ kubectl get pv --all-namespaces | grep local-storage

六、Install TiDB Operator

项目中使用了gcr.io/google-containers/hyperkube，国内访问不了，简单的办法是把镜像重新push到dockerhub然后修改charts/tidb-operator/values.yaml

  scheduler:
   # With rbac.create=false, the user is responsible for creating this   account
   # With rbac.create=true, this service account will be created
   # Also see rbac.create and clusterScoped
   serviceAccount: tidb-scheduler
   logLevel: 2
   replicas: 1
   schedulerName: tidb-scheduler
   resources:
    limits:
      cpu: 250m
      memory: 150Mi
    requests:
      cpu: 80m
      memory: 50Mi
  # kubeSchedulerImageName: gcr.io/google-containers/hyperkube
  kubeSchedulerImageName: yourrepo/hyperkube
  # This will default to matching your kubernetes version
  # kubeSchedulerImageTag: latest

TiDB Operator使用CRD扩展Kubernetes，因此要使用TiDB Operator，首先应该创建TidbCluster自定义资源类型。

 kubectl apply -f https://raw.githubusercontent.com/pingcap/tidb-operator/master/manifests/crd.yaml
 kubectl get crd tidbclusters.pingcap.com

安装TiDB-Operator

 $ git clone https://github.com/pingcap/tidb-operator.git
 $ cd tidb-operator
 $ helm install charts/tidb-operator --name=tidb-operator   --namespace=tidb-admin
 $ kubectl get pods --namespace tidb-admin -l app.kubernetes.io/  instance=tidb-operator

七、部署TiDB

 helm install charts/tidb-cluster --name=demo --namespace=tidb
 watch kubectl get pods --namespace tidb -l app.kubernetes.io/instance=demo -o wide

八、验证

安装MySQL客户端

参考文档https://dev.mysql.com/doc/refman/8.0/en/linux-installation.html
CentOS安装

 wget https://dev.mysql.com/get/mysql80-community-release-el7-3.noarch.rpm
 yum localinstall mysql80-community-release-el7-3.noarch.rpm -y
 yum repolist all | grep mysql
 yum-config-manager --disable mysql80-community
 yum-config-manager --enable mysql57-community
 yum install mysql-community-client

Ubuntu安装

 wget https://dev.mysql.com/get/mysql-apt-config_0.8.13-1_all.deb
 dpkg -i mysql-apt-config_0.8.13-1_all.deb
 apt update

 # 选择MySQL版本
 dpkg-reconfigure mysql-apt-config
 apt install mysql-client -y

九、映射TiDB端口

查看TiDB Service

 kubectl get svc --all-namespaces

映射TiDB端口

 # 仅本地访问
 kubectl port-forward svc/demo-tidb 4000:4000 --namespace=tidb

 # 其他主机访问
 kubectl port-forward --address 0.0.0.0 svc/demo-tidb 4000:4000 --namespace=tidb

首次登录MySQL

 mysql -h 127.0.0.1 -P 4000 -u root -D test

修改TiDB密码

 SET PASSWORD FOR 'root'@'%' = 'wD3cLpyO5M'; FLUSH PRIVILEGES;

=========================================================

趟坑小记

1、K8s国内安装

K8s镜像多在gcr.io国内访问不到，基本做法是把镜像导入DockerHub或者私有镜像，这一点在K8s部署章节有详细过程就不累述了。

2、TiDB-Operator 本地存储配置

Operator在启动集群时pd和TiKV需要绑定本地存储如果挂载点不足会导致pod启动过程中找不到可已bond的pv始终处于pending或createing状态，详细配请参阅https://github.com/kubernetes-sigs/sig-storage-local-static-provisioner/blob/master/docs/operations.md中“Sharing a disk filesystem by multiple filesystem PVs”一节，同一块磁盘绑定多个挂载目录，为Operator提供足够的bond

3、MySQL客户端版本问题

目前TiDB只支持MySQL5.7版本客户端8.0会报ERROR 1105 (HY000): Unknown charset id 255

===========================================================

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