Rancher快速安裝 - K3S與nip.io篇

# 環境資訊為了要快速安裝一套Rancher環境使用，需要一個小的K8s叢集，為此，我們有K3s跟RKE2兩種快速安裝的方法可以使用。 :::warning 不用裝Docker。 K3s與RKE2為SUSE的K8s發行版本，版號與K8s版一致(e.g. K3s 1.31.4 = K8s 1.31.4)。 SUSE提供K3s、RKE2與Rancher的商用支援。舊版的RKE將在2025七月EoL。有其他安裝方法，畢竟Rancher是container，需要搭配ingress使用。 ::: :::info K3s對資源的需求低，本文主要使用K3s作為快速安裝說明，Production環境請改用RKE2。 ::: 1. Rancher K3s單節點VM，也可相容於ARM架構，例如樹莓派環境，K8s環境為Rancher下轄之叢集，具備完整K8s架構，在Rancher Production環境建立時，請使用RKE2。 2. 最低資源需求，可參考[K3S](https://docs.k3s.io/installation/requirements#hardware)官方網站 1. Rancher管理節點： 1.1. 建議CPU: 4 core, RAM: 8G, Disk: 80G, 1 NIC可聯外。 2. K8S叢集： 2.1. Master(3 node): 4 core, RAM: 8G, Disk: 80G, 1 NIC可聯外。 2.2. Worker(1+N node): 4 core, RAM: 8G, Disk: 80G, 1 NIC可聯外。 4. K3S版本：v1.31.4+k3s1 5. Rancher版本：2.10.2 6. RKE2版本：1.31+ 7. Helm版本：3.16.4 :::info 為什麼要用nip.io? 因為另外架DNS花時間跟資源，用nip.io的方式直接指向到單節點上去解析就好。 ::: # 1. K3S安裝 ```shell= k3snode:~ # export INSTALL_K3S_VERSION=v1.31.4+k3s1 k3snode:~ # curl -sfL https://get.k3s.io | sh - [INFO] Using v1.31.4+k3s1 as release [INFO] Downloading hash https://github.com/k3s-io/k3s/releases/download/v1.31.4+k3s1/sha256sum-amd64.txt [INFO] Downloading binary https://github.com/k3s-io/k3s/releases/download/v1.31.4+k3s1/k3s [INFO] Verifying binary download [INFO] Installing k3s to /usr/local/bin/k3s [INFO] Skipping installation of SELinux RPM [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 Created symlink /etc/systemd/system/multi-user.target.wants/k3s.service → /etc/systemd/system/k3s.service. [INFO] systemd: Starting k3s ``` ## 1.1. 檢查k3s狀態 ```shell= k3snode:~ # systemctl status k3s ● k3s.service - Lightweight Kubernetes Loaded: loaded (/etc/systemd/system/k3s.service; enabled; preset: disabled) Active: active (running) since Mon 2025-02-03 09:15:26 CST; 44s ago Docs: https://k3s.io Process: 20398 ExecStartPre=/bin/sh -xc ! /usr/bin/systemctl is-enabled --quiet nm-cloud-setup.service 2>/dev/null> Process: 20400 ExecStartPre=/sbin/modprobe br_netfilter (code=exited, status=0/SUCCESS) Process: 20406 ExecStartPre=/sbin/modprobe overlay (code=exited, status=0/SUCCESS) Main PID: 20408 (k3s-server) Tasks: 92 CPU: 34.880s ``` ## 1.2. 檢查pod是否全部啟動 ```shell= k3snode:~ # kubectl get po -A NAMESPACE NAME READY STATUS RESTARTS AGE kube-system coredns-ccb96694c-bqzn4 1/1 Running 0 84s kube-system helm-install-traefik-crd-x4pmm 0/1 Completed 0 84s kube-system helm-install-traefik-wwtkk 0/1 Completed 1 84s kube-system local-path-provisioner-5cf85fd84d-kr8x4 1/1 Running 0 84s kube-system metrics-server-5985cbc9d7-7qlm4 1/1 Running 0 84s kube-system svclb-traefik-f6012ca2-6gwjz 2/2 Running 0 60s kube-system traefik-57b79cf995-xm4h5 1/1 Running 0 60s ``` ## 1.3. 檢察節點狀態 ```shell= k3snode:~ # kubectl get no NAME STATUS ROLES AGE VERSION k3snode Ready control-plane,master 4m2s v1.31.4+k3s1 ``` # 2. Helm安裝 Helm需對應K8s的發行版，請參照[Helm Version Support Policy](https://helm.sh/docs/topics/version_skew/) ```shell= k3snode:~ # wget https://get.helm.sh/helm-v3.16.4-linux-amd64.tar.gz --2025-02-03 09:26:40-- https://get.helm.sh/helm-v3.16.4-linux-amd64.tar.gz Resolving get.helm.sh (get.helm.sh)... 13.107.246.73, 2620:1ec:bdf::73 Connecting to get.helm.sh (get.helm.sh)|13.107.246.73|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 17344287 (17M) [application/x-tar] Saving to: ‘helm-v3.16.4-linux-amd64.tar.gz’ helm-v3.16.4-linux-amd64.tar. 100%[================================================>] 16.54M 1.74MB/s in 10s 2025-02-03 09:26:52 (1.63 MB/s) - ‘helm-v3.16.4-linux-amd64.tar.gz’ saved [17344287/17344287] k3snode:~ # tar -zxvf helm-v3.16.4-linux-amd64.tar.gz linux-amd64/ linux-amd64/LICENSE linux-amd64/README.md linux-amd64/helm k3snode:~ # sudo cp linux-amd64/helm /usr/local/bin/ k3snode:~ # helm --help The Kubernetes package manager Common actions for Helm: - helm search: search for charts ... ... ... ``` ## 2.1. 指定helm使用k3s產出的kubeconfig :::warning 需要指定K8s config file給helm使用。 RKE2不用這個步驟。 ::: ```shell= k3snode:~ # export KUBECONFIG=/etc/rancher/k3s/k3s.yaml ``` # 3. cert-manager安裝 Rancher需要使用憑證，可以透過Cert-manager處理。如果想要自簽憑證的話，可以透過openssl來產生，對指令覺得很生澀的話，可以透過xca來處理，但是要裝GUI才能使用。 ```shell= k3snode:~ # helm repo add jetstack https://charts.jetstack.io "jetstack" has been added to your repositories k3snode:~ # kubectl create namespace cert-manager namespace/cert-manager created k3snode:~ # kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.13.1/cert-manager.crds.yaml customresourcedefinition.apiextensions.k8s.io/certificaterequests.cert-manager.io created customresourcedefinition.apiextensions.k8s.io/certificates.cert-manager.io created customresourcedefinition.apiextensions.k8s.io/challenges.acme.cert-manager.io created customresourcedefinition.apiextensions.k8s.io/clusterissuers.cert-manager.io created customresourcedefinition.apiextensions.k8s.io/issuers.cert-manager.io created customresourcedefinition.apiextensions.k8s.io/orders.acme.cert-manager.io created k3snode:~ # helm install cert-manager jetstack/cert-manager \ --namespace cert-manager \ --create-namespace \ --version v1.13.1 NAME: cert-manager LAST DEPLOYED: Mon Feb 3 09:41:44 2025 NAMESPACE: cert-manager STATUS: deployed REVISION: 1 TEST SUITE: None NOTES: cert-manager v1.13.1 has been deployed successfully! In order to begin issuing certificates, you will need to set up a ClusterIssuer or Issuer resource (for example, by creating a 'letsencrypt-staging' issuer). More information on the different types of issuers and how to configure them can be found in our documentation: https://cert-manager.io/docs/configuration/ For information on how to configure cert-manager to automatically provision Certificates for Ingress resources, take a look at the `ingress-shim` documentation: https://cert-manager.io/docs/usage/ingress/ k3snode:~ # kubectl -n cert-manager get po NAME READY STATUS RESTARTS AGE cert-manager-6f8689cf7-bxqwk 1/1 Running 0 68s cert-manager-cainjector-7f4fbb5c79-mqkq5 1/1 Running 0 68s cert-manager-webhook-b4bff58b5-xmvz8 1/1 Running 0 68s ``` # 4. Rancher安裝 :::info 1. 商用版本Rancher有指定的repo位置。 2. 社群跟商用版本在新功能支援、安規上會有差異，請多留意。 3. 如果你有自架DNS，可以把hostname換成你要的fqdn，只要全部的節點可以透過DNS解析到即可。 ::: :::danger 從主機上面加fqdn進hosts是沒用的。 ::: ```shell= k3snode:~ # helm repo add rancher-stable https://releases.rancher.com/server-charts/stable "rancher-stable" has been added to your repositories k3snode:~ # helm search repo rancher-stable NAME CHART VERSION APP VERSION DESCRIPTION rancher-stable/rancher 2.10.2 v2.10.2 Install Rancher Server to manage Kubernetes clu... k3snode:~ # helm repo update Hang tight while we grab the latest from your chart repositories... ...Successfully got an update from the "jetstack" chart repository ...Successfully got an update from the "rancher-stable" chart repository Update Complete. ⎈Happy Helming!⎈ k3snode:~ # helm install rancher rancher-stable/rancher --namespace cattle-system \ --create-namespace --set hostname=rancher.192.168.122.112.nip.io \ --version 2.10.2 --set global.cattle.psp.enabled=false --set replicas=1 NAME: rancher LAST DEPLOYED: Mon Feb 3 09:45:19 2025 NAMESPACE: cattle-system STATUS: deployed REVISION: 1 TEST SUITE: None NOTES: Rancher Server has been installed. NOTE: Rancher may take several minutes to fully initialize. Please standby while Certificates are being issued, Containers are started and the Ingress rule comes up. Check out our docs at https://rancher.com/docs/ If you provided your own bootstrap password during installation, browse to https://rancher.192.168.122.112.nip.io to get started. If this is the first time you installed Rancher, get started by running this command and clicking the URL it generates: echo https://rancher.192.168.122.112.nip.io/dashboard/?setup=$(kubectl get secret --namespace cattle-system bootstrap-secret -o go-template='{{.data.bootstrapPassword|base64decode}}') To get just the bootstrap password on its own, run: kubectl get secret --namespace cattle-system bootstrap-secret -o go-template='{{.data.bootstrapPassword|base64decode}}{{ "\n" }}' Happy Containering! ``` # 4.1. Check cattle-system與取得隨機密碼 ```shell! k3snode:~ # kubectl get po -n cattle-system NAME READY STATUS RESTARTS AGE helm-operation-4mvzp 0/2 Completed 0 3m7s helm-operation-56rf7 0/2 Completed 0 74s helm-operation-87wln 0/2 Completed 0 3m31s helm-operation-htkds 0/2 Completed 0 2m38s helm-operation-jkpgj 0/2 Completed 0 115s helm-operation-js9s7 0/2 Completed 0 2m27s helm-operation-z4zxq 0/2 Completed 0 101s rancher-6fffd8796c-6srtv 1/1 Running 0 5m8s rancher-webhook-554ffd94d8-5h77h 1/1 Running 0 2m23s system-upgrade-controller-5fb67f585d-9zd2q 1/1 Running 0 111s k3snode:~ # kubectl get secret --namespace cattle-system bootstrap-secret -o go-template='{{.data.bootstrapPassword|base64decode}}{{"\n"}}' xfwbrnv6j4r8wcm9tldzjt567tkpmxbsr27hprv4g4t6q94xfq9tfw ``` :::info 登入瀏覽器，進入rancher.192.168.122.112.nip.io 貼上隨機密碼、修改密碼後再次登入。 ::: # 5. 新增k3s叢集 ## 5.1. 建立叢集基本資訊建立叢集時先點選RKE2/K3s後，點選下方 **Custom** ![截圖 2024-08-02 09.58.24](https://hackmd.io/_uploads/r1jQx6KK0.png) 輸入基本資訊 ![截圖 2025-02-03 09.57.16](https://hackmd.io/_uploads/rkFnGoT_kx.png) ## 5.2. 複製建立指令 :::danger 1. 注意，節點腳色需要特別注意etcd，建議為奇數台，例如1, 3, 5，不可偶數。 2. 不建議把etcd、Control跟worker node在Production環境混用，你可能沒遇過壞人？ ::: ![截圖 2024-07-01 12.52.09](https://hackmd.io/_uploads/r1yaInkwC.png) ## 5.3. 貼上註冊腳本 :::info 1. OS可先把防火牆關閉。 2. OS可參考support matrix上所指定的版本。 ::: ```shell= k3scluster1:~ # curl --insecure -fL https://rancher.192.168.122.112.nip.io/system-agent-install.sh | sudo sh -s - --server https://rancher.192.168.122.112.nip.io --label 'cattle.io/os=linux' --token lfj97gnn7r786j9njtrt9z9jbtl9c6lq7m7xzk5gbhw4hn998c5kvt --ca-checksum e8891a52d7b74b83131d744ece0f6e97d2639da48974355c9bbe075f54d10516 --etcd --controlplane --worker % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 33698 0 33698 0 0 102k 0 --:--:-- --:--:-- --:--:-- 102k [INFO] Label: cattle.io/os=linux [INFO] Role requested: etcd [INFO] Role requested: controlplane [INFO] Role requested: worker [INFO] CA strict verification is set to true [INFO] Using default agent configuration directory /etc/rancher/agent [INFO] Using default agent var directory /var/lib/rancher/agent [WARN] /usr/local is read-only or a mount point; installing to /opt/rancher-system-agent [INFO] Successfully downloaded CA certificate [INFO] Value from https://rancher.192.168.122.112.nip.io/cacerts is an x509 certificate [INFO] Successfully tested Rancher connection [INFO] Downloading rancher-system-agent binary from https://rancher.192.168.122.112.nip.io/assets/rancher-system-agent-amd64 [INFO] Successfully downloaded the rancher-system-agent binary. [INFO] Downloading rancher-system-agent-uninstall.sh script from https://rancher.192.168.122.112.nip.io/assets/system-agent-uninstall.sh [INFO] Successfully downloaded the rancher-system-agent-uninstall.sh script. [INFO] Generating Cattle ID [INFO] Successfully downloaded Rancher connection information [INFO] systemd: Creating service file [INFO] Creating environment file /etc/systemd/system/rancher-system-agent.env [INFO] /usr/local is unsuitable for installation: adding fallback path to systemd unit env file. [INFO] Enabling rancher-system-agent.service Created symlink /etc/systemd/system/multi-user.target.wants/rancher-system-agent.service → /etc/systemd/system/rancher-system-agent.service. [INFO] Starting/restarting rancher-system-agent.service ``` ## 5.4. 確認節點進度部署中。 ![截圖 2025-02-03 10.06.06](https://hackmd.io/_uploads/B1ntHiauke.png) 部署完畢。 ![截圖 2025-02-03 10.09.24](https://hackmd.io/_uploads/r1f5rja_Jg.png) 點擊上方的Explore就可以查看建立好叢集囉。 ## 5.5. 確認環境確認目前叢集資源狀態 ![截圖 2025-02-03 10.11.50](https://hackmd.io/_uploads/r18VUi6_Je.png) 點選右上角的指令圖示 >_ 確認容器相關狀態 ![截圖 2025-02-03 10.14.38](https://hackmd.io/_uploads/r11i0iad1e.png) :::info 安裝參考影片：https://drive.google.com/file/d/1FlEn7QM-pPMcqIZ_m79ajgqQrVzJnXOC/view?usp=drive_link 其他參考影片：https://drive.google.com/drive/folders/1AZDKx7XTZY6gq_tE24f8kjudJvfF46RX?usp=drive_link RKE2, also known as RKE Government, is Rancher's next-generation Kubernetes distribution. K3s, Lightweight Kubernetes. Easy to install, half the memory, all in a binary of less than 100 MB. :::

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