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K3S系列文章-使用AutoK3s在腾讯云上安装高可用K3S集群

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开篇

  • 《K3s 系列文章》
  • 《Rancher 系列文章》

方案

在腾讯云上安装 K3S

后续会在这套 K3S 集群上安装 Rancher

方案目标

  1. 高可用
    1. 3 台master 的 k3s 集群
  2. 数据备份
    1. k3s 数据备份到 腾讯云对象存储 cos
  3. 尽量复用公有云的能力
    1. Tencent Cloud Controller Manager (❌ 因为腾讯云已经放弃维护相关源码, 所以无法复用)
    2. SVC LoadBalancer 调用 CLB (❌ 因为腾讯云已经放弃维护相关源码, 所以无法复用)
    3. 备份 - 使用腾讯云 COS

前提条件

  1. 有腾讯云账户,账户至少拥有如下权限:auto k3s 安装 - 设置 CAM 以及这些权限:

    1. QcloudTAGFullAccess
  2. 该腾讯云账号有对应的 API 密钥,地址:访问密钥 - 控制台 (tencent.com) ,或者拥有相关权限:cam:QueryCollApiKeycam:CreateCollApiKey

  3. 一台 linux 操作机,用于部署 autok3s

  4. 一个对象存储通 cos,用于备份

  5. 已有的镜像仓库的一些账号密码或认证信息,包括:quay,docker,腾讯云 (用于加速 pull push镜像)

    ℹ️ Info:

    腾讯云 tcr 广州 提供免费个人版实例,可以使用并添加:

    https://ccr.ccs.tencentyun.com

K3S 安装注意事项

  1. 通过autok3s部署
  2. 通过 autok3s 安装后, 默认 k8s api 通过 公网 IP 进行通信, 需要调整 systemd 配置使其通过内网进行通信.
  3. ⚠️付费模式,安装后可根据具体情况在将付费模式控制台改为:包年包月

K3S 安装参数

本次 K3s 安装参数如下:

  1. Master 3
  2. Worker: 0
  3. Region:shanghai (ap-shanghai
  4. zone:二区(ap-shanghai-2
  5. Instance Type:S5.MEDIUM8
  6. Image: img-22trbn9x (ubuntu 20.04)
  7. instanceChargeType:默认后付费,且无法调整。⚠️安装后控制台改为:PREPAID
  8. Disk: CLOUD_SSD (ℹ️ CLOUD_PREMIUM(高性能云盘), CLOUD_SSD(SSD云硬盘))
  9. Disk Size: 50 G
  10. VPC ID: 空(autok3s 会自动创建)
  11. Subnet ID: 空(autok3s 会自动创建)
  12. Internet Max Bandwidth Out:5 (可以按需调小)
  13. Security Group Ids:空, 让 autok3s 自动创建, 集群创建好之后再调整安全组, 缩小入口范围
  14. EIP:是否使用弹性公网IP false
  15. Tags (见下文)
  16. K3s Version: v1.21.7+k3s1
  17. Cluster: true
  18. Master Extra Args: 见下文
  19. Cluster模式: true
  20. Registry(见下文)
  21. UI:true

⚠️ Warning:

执行 autok3s 创建前, 如果选择已有的安全组, 那么 CVM 实例至少需要应用以下安全组规则:

Rule        Protocol    Port      Source             Description
InBound     TCP         22        ALL                SSH Connect Port
InBound     TCP         6443      K3s agent nodes    Kubernetes API
InBound     TCP         10250     K3s server & agent Kubelet
InBound     UDP         8472      K3s server & agent (Optional) Required only for Flannel VXLAN
InBound     TCP         2379,2380 K3s server nodes   (Optional) Required only for embedded ETCD
OutBound    ALL         ALL       ALL                Allow All

特别是: 22 端口必须要对操作机的公网IP 开放

原因: autok3s 自动部署公有云时, 通过公网IP 上传 KeyPair, 如果没有以上安全组, autok3s 会执行失败. 报错如下: (101.34.46.218 就是公网 IP)

level=error msg="[ssh-dialer] init dialer [101.34.46.218:22] error: [tencent] calling getInstanceStatus error. region: ap-shanghai, zone: ap-shanghai-2, instanceName: [ins-ggxozpyl ins-cfi2vio1 ins-78rkem0b], message: not `RUNNING` status"

安装步骤

AutoK3s

在操作机上安装,命令如下:

curl -sS http://rancher-mirror.cnrancher.com/autok3s/install.sh  | INSTALL_AUTOK3S_MIRROR=cn sh

过程如下:

Downloading package http://rancher-mirror.rancher.cn/autok3s/v0.4.6/autok3s_linux_amd64 as /tmp/autok3s_linux_amd64
Download complete.

Running with sufficient permissions to attempt to move autok3s to /usr/local/bin
New version of autok3s installed to /usr/local/bin
Version: {"gitVersion":"v0.4.6","gitCommit":"4537e6ee2aea8b204a72f7b6c377edb154f7c058","gitTreeState":"","buildDate":"2021-12-28T04:15:30Z","goVersion":"go1.16.2","compiler":"gc","platform":"linux/amd64"}
Downloading package http://rancher-mirror.rancher.cn/kube-explorer/v0.2.7/kube-explorer-linux-amd64 as /tmp/kube-explorer-linux-amd64
Download complete.

Running with sufficient permissions to attempt to move kube-explorer to /usr/local/bin
New version of kube-explorer installed to /usr/local/bin
Skipping /usr/local/bin/kubectl symlink to autok3s, already exists

您可以通过以下 CLI 命令启动本地 UI。

autok3s serve --bind-address 0.0.0.0 --bind-port 8087

⚠️ Warning:

页面无登录认证,确保最小权限开放以及用完后及时关闭。

输出如下:

INFO[0000] run as daemon, listening on 127.0.0.1:8087

访问 UI:http://<操作机IP>:8087

AutoK3s UI 模板

如果今后要多次安装,可以在 UI 上创建可复用的模板,模板包括如下固定参数:

  1. Credential Options:

    1. 腾讯云 Secret Id
    2. 腾讯云 Secret Key
  2. Instance Options

    1. Basic
      1. Region:ap-shanghai
      2. Zone:ap-shanghai-2
      3. Instance Type: S5.MEDIUM8
      4. Image: img-22trbn9x (ubuntu 20.04)
      5. Disk Category: CLOUD_SSD
      6. Disk Size: 50 G
    2. Network
      1. Internet Max Bandwidth Out:5
      2. EIP: Disable
      3. ⚠️ 注意:另外 3 个参数:VPC ID、SubnetID、Security Group Ids 每次创建时需要按需填写或留空
    3. SSH Public
      1. SSH User:ubuntu
      2. SSH Port:22
      3. Keypair Id : 留空(⚠️ 注意:如果 Keypair Id 留空,会自动生成 Keypair)
    4. SSH Private
      1. SSH Agent Auth:Disable
      2. SSH Key Path: 留空(⚠️ 注意:如果上面选择了 Keypair Id, 那么对应的SSH Key Path 也要填写)
    5. Advance
      1. 打了 3 个 tags,方便后续管理:
        1. app=rancher
        2. env=prod
        3. provider=k3s
  3. K3s Options

    1. Basic

      1. K3s Channel: stable
      2. K3s Version: v1.21.7+k3s1 (ℹ️ Info: 202201 根据 suse 官网选型的最新稳定版,k3s v1.21.7+k3s1,后面会按需调整版本)
      3. Cluster: Enable(启用集群模式,使用 etcd 组成高可用集群)
      4. K3s Install Script:http://rancher-mirror.cnrancher.com/k3s/k3s-install.sh
    2. Master

      1. Master: 3

      2. Master Extra Args:

        --write-kubeconfig-mode "644" --pause-image registry.cn-hangzhou.aliyuncs.com/rancher/pause:3.6 --etcd-s3 --etcd-snapshot-schedule-cron 0 0 * * * --etcd-s3-endpoint cos.ap-shanghai.myqcloud.com --etcd-s3-access-key <your-cos-access-key> --etcd-s3-secret-key  <your-cos-secret-key> --etcd-s3-bucket  <your-cos-bucket> --etcd-s3-folder /rancher/k3s
        
    3. Worker

      1. Worker: 0
    4. Advance: 留空

    5. TLS Sans: 留空 (⚠️ 如果前面会使用 CLB 作为负载均衡,那么建议填上 CLB VIP)

    6. Registry, 见下面registries.yaml

  4. Additional Options

    1. UI: explorer

registries.yaml:

mirrors:
  docker.io:
    endpoint:
      - "https://mirror.ccs.tencentyun.com"
      - "https://registry.cn-hangzhou.aliyuncs.com"
      - "https://docker.mirrors.ustc.edu.cn"
  quay.io:
    endpoint:
      - "https://mirror.ccs.tencentyun.com"    
configs:
  'ccr.ccs.tencentyun.com':
    auth:
      username: <your-account-id>
      password: <your-registry-password>

AutoK3s 通过 UI 创建 K3S 集群

访问 UI 界面, 点击 Quick Start, Provider 选择 tencent;

然后在下方填入自定义的信息, 主要是填写 Network 的信息, 如下图:

点击 Create, 等待返回结果即可.

AutoK3s CLI 命令

您也可以通过以下 CLI 在 腾讯云上快速创建一个 3 master, 0 worker 节点的 K3s 高可用集群。

autok3s create --provider tencent --cluster --enable [ "explorer" ] --k3s-channel stable --k3s-install-mirror INSTALL_K3S_MIRROR=cn --k3s-install-script http://rancher-mirror.cnrancher.com/k3s/k3s-install.sh --k3s-version v1.21.7+k3s1 --master 3 --master-extra-args '--write-kubeconfig-mode "644" --pause-image registry.cn-hangzhou.aliyuncs.com/rancher/pause:3.6 --etcd-s3 --etcd-snapshot-schedule-cron 0 0 * * * --etcd-s3-endpoint cos.ap-shanghai.myqcloud.com --etcd-s3-access-key <your-cos-access-key> --etcd-s3-secret-key <your-cos-secret-key> --etcd-s3-bucket <your-cos-bucket> --etcd-s3-folder /rancher/k3s' --name rancher-1 --ssh-port 22 --ssh-user ubuntu --tls-sans <your-clb-ip> --worker 0 --disk-category CLOUD_SSD --disk-size 50 --image img-22trbn9x --instance-type S5.MEDIUM8 --internet-max-bandwidth-out 5 --keypair-id <your-keypair-id> --region ap-shanghai --secret-id <your-tencent-secret-id> --secret-key <your-tencent-secret-key> --tags 'app=rancher' --tags 'env=prod' --tags 'provider=k3s' --zone ap-shanghai-2 --vpc <your-vpc-id> --subnet <your-subnet-id> --registry /etc/autok3s/registries.yaml

安装成功日志显示如下:

time="2022-02-12T14:52:16+08:00" level=info msg="[tencent] executing create logic..."
INFO[0000] [tencent] use existing key pair 
time="2022-02-12T14:52:16+08:00" level=info msg="[tencent] 3 masters and 0 workers will be added"
time="2022-02-12T14:52:16+08:00" level=info msg="[tencent] check default security group autok3s in region ap-shanghai"
time="2022-02-12T14:52:16+08:00" level=info msg="[tencent] create default security group autok3s in region ap-shanghai"
time="2022-02-12T14:52:16+08:00" level=info msg="[tencent] check rules of security group autok3s"
time="2022-02-12T14:52:18+08:00" level=info msg="[tencent] 3 number of master instances will be created"
time="2022-02-12T14:52:23+08:00" level=info msg="[tencent] 3 number of master instances successfully created"
time="2022-02-12T14:52:23+08:00" level=info msg="[tencent] waiting for the instances [ins-xxxxx] to be in `RUNNING` status..."
time="2022-02-12T14:52:54+08:00" level=info msg="[tencent] instances [ins-xxxxx] are in `RUNNING` status"
time="2022-02-12T14:52:54+08:00" level=info msg="[tencent] executing init k3s cluster logic..."
time="2022-02-12T14:52:54+08:00" level=info msg="[tencent] creating k3s master-1..."
mirrors:
    docker.io:
        endpoint:
            - https://mirror.ccs.tencentyun.com
            - https://registry.cn-hangzhou.aliyuncs.com
            - https://docker.mirrors.ustc.edu.cn
    quay.io:
        endpoint:
            - https://mirror.ccs.tencentyun.com
configs:
    ccr.ccs.tencentyun.com:
        auth:
            username: 
            password: 
            auth: ""
            identity_token: ""
        tls: null
auths: {}
time="2022-02-12T14:53:26+08:00" level=info msg="[cluster] k3s master command: curl -sLS http://rancher-mirror.cnrancher.com/k3s/k3s-install.sh | INSTALL_K3S_MIRROR=cn K3S_TOKEN='xxxxxxx' INSTALL_K3S_EXEC='server  --tls-san xxxxx --tls-san xxxxxxxx --tls-san xxxxxxx --node-external-ip xxxxxx --write-kubeconfig-mode \"644\" --pause-image registry.cn-hangzhou.aliyuncs.com/rancher/pause:3.6 --disable-cloud-controller --cluster-cidr 10.42.0.0/16 --cluster-init' INSTALL_K3S_VERSION='v1.21.7+k3s1' sh -"
[INFO]  Using v1.21.7+k3s1 as release
[INFO]  Downloading hash http://rancher-mirror.cnrancher.com/k3s/v1.21.7-k3s1/sha256sum-amd64.txt
[INFO]  Downloading binary http://rancher-mirror.cnrancher.com/k3s/v1.21.7-k3s1/k3s
[INFO]  Verifying binary download
[INFO]  Installing k3s to /usr/local/bin/k3s
[INFO]  Creating /usr/local/bin/kubectl symlink to k3s
[INFO]  Creating /usr/local/bin/crictl symlink to k3s
[INFO]  Creating /usr/local/bin/ctr symlink to k3s
[INFO]  Creating killall script /usr/local/bin/k3s-killall.sh
[INFO]  Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO]  env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO]  systemd: Creating service file /etc/systemd/system/k3s.service
[INFO]  systemd: Enabling k3s unit
[INFO]  systemd: Starting k3s
time="2022-02-12T14:53:59+08:00" level=info msg="[tencent] successfully created k3s master-1"
time="2022-02-12T14:53:59+08:00" level=info msg="[tencent] creating k3s master-2..."
...
time="2022-02-12T14:54:35+08:00" level=info msg="[tencent] successfully created k3s master-2"
time="2022-02-12T14:54:35+08:00" level=info msg="[tencent] creating k3s master-3..."
...
time="2022-02-12T14:55:06+08:00" level=info msg="[tencent] successfully created k3s master-3"
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: ......
    server: https://127.0.0.1:6443
  name: default
contexts:
- context:
    cluster: default
    user: default
  name: default
current-context: default
kind: Config
preferences: {}
users:
- name: default
  user:
    client-certificate-data: ......
    client-key-data: ......
time="2022-02-12T14:55:06+08:00" level=info msg="[tencent] deploying additional manifests"
time="2022-02-12T14:55:06+08:00" level=info msg="[tencent] successfully deployed additional manifests"
time="2022-02-12T14:55:06+08:00" level=info msg="[tencent] successfully executed init k3s cluster logic"
---
time="2022-02-12T14:55:07+08:00" level=info msg="[tencent] successfully deployed manifests"
time="2022-02-12T14:55:07+08:00" level=info msg="=========================== Prompt Info ==========================="
time="2022-02-12T14:55:07+08:00" level=info msg="Use 'autok3s kubectl config use-context prod-ha.ap-shanghai.tencent'"
time="2022-02-12T14:55:07+08:00" level=info msg="Use 'autok3s kubectl get pods -A' get POD status`"

&#127881; 到这里, K3S 集群创建完毕.

K3s 配置调整

&#128681; Important:

安装后, 默认 k8s api 通过 公网 IP 进行通信, 出于安全考虑,建议调整 systemd 配置使其通过内网进行通信.

步骤如下:

修改后两台 master 的 /etc/systemd/system/k3s.service.envK3S_URL 为第一台 master 的内网地址

K3S_URL=https://<master1-internal-ip>:6443

第一台 master, 修改 /etc/systemd/system/k3s.service , 增加:

        '--node-ip' \
        '<master1-internal-ip>' \
        '--advertise-address' \
        '<master1-internal-ip>' \
        

另外2台, 增加及修改如下:

        '--server' \
        'https://<master1-internal-ip>:6443' \
        ...
        '--node-ip' \
        '<other-master-internal-ip>' \
        '--advertise-address' \
        '<other-master-internal-ip>' \
        

重启生效:

systemctl daemon-reload
systemctl restart k3s.service

验证:

查看 kubernetes 的 endpoint, 从公网地址变为内网地址, 如下:

apiVersion: v1
kind: Endpoints
metadata:
  name: kubernetes
  namespace: default
  ...
  labels:
    endpointslice.kubernetes.io/skip-mirror: 'true'
  managedFields:
    - manager: k3s
      operation: Update
      ...
  selfLink: /api/v1/namespaces/default/endpoints/kubernetes
subsets:
  - addresses:
      - ip: <master2-internal-ip>
      - ip: <master1-internal-ip>
      - ip: <master3-internal-ip>
    ports:
      - name: https
        port: 6443
        protocol: TCP

收尾工作

调整安全组

入站规则:

  1. TCP:22(SSH) 端口权限收紧
  2. TCP:6443(K8S API) 端口权限收紧
  3. UDP:8472(K3s vxlan) 只开放给内网
  4. TCP:10250(kube api-server) 只开放给内网

最终效果如下: (应该可以进一步收紧)

总结

&#127881;&#127881;&#127881; 至此, 完成腾讯云上 K3S 高可用集群的搭建, 并配置备份.

为后面的 Rancher 搭建做好了基础。

以下是安装后的相关输出信息:

K3s

  1. 3 个 Master 和 Server hostname、内外网IP

  2. K3S API Server 地址:https://<以上6个IP地址任一个或CLB的IP>:6443

  3. K3S kubeconfig 配置:位于 k3s 的/etc/rancher/k3s/k3s.yaml 以及操作机的 /root/.autok3s/.kube/config

三人行, 必有我师; 知识共享, 天下为公. 本文由东风微鸣技术博客 EWhisper.cn 编写.

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