RancherD安裝高可用Rancher2.5.x

一、概述

Rancher2.5.x支持多種高可用安裝，官方發佈一款名爲RancherD的工具，可以傻瓜化安裝高可用集羣。

二、安裝

1、使用root登錄服務器

2、新建配置文件/etc/rancher/rke2/config.yaml

token: my-shared-secret
tls-san:
  - my-fixed-registration-address.com

注意其中token是其它節點加入集羣的憑證；my-fixed-registration-address.com是你實際的master域名，比如master.rancher.com，此域名可設置多個；

3、下載RancherD

curl -sfL https://get.rancher.io | INSTALL_RANCHERD_VERSION=v2.5.9-rc3 sh -

4、啓動

systemctl enable rancherd-server.service
systemctl start rancherd-server.service

5、等待啓動安裝完成，此時可執行如下命令查看安裝日誌

journalctl -eu rancherd-server -f

當看到如下內容，即代表安裝完成：

7月 01 15:10:15 rancherd-master rancherd[3395]: time="2021-07-01T15:10:15+08:00" level=info msg="Handling backend connection request [rancherd-master]"
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.536804    3395 node_controller.go:115] Sending events to api server.
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.536894    3395 controllermanager.go:285] Started "cloud-node"
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.537067    3395 node_controller.go:154] Waiting for informer caches to sync
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.538293    3395 node_lifecycle_controller.go:76] Sending events to api server
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.538361    3395 controllermanager.go:285] Started "cloud-node-lifecycle"
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.637720    3395 node_controller.go:390] Initializing node rancherd-master with cloud provider
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.642797    3395 node_controller.go:454] Successfully initialized node rancherd-master with cloud provider
7月 01 15:10:15 rancherd-master rancherd[3395]: I0701 15:10:15.643827    3395 event.go:291] "Event occurred" object="rancherd-master" kind="Node" apiVersion="v1" type="Normal" reason="Synced" message="Node synced successfully"

6、設置kubeconfig

export KUBECONFIG=/etc/rancher/rke2/rke2.yaml PATH=$PATH:/var/lib/rancher/rke2/bin

7、驗證安裝

輸入驗證命令，輸出如下內容時表示安裝完成。

root@rancherd-master:/etc/rancher/rke2# kubectl get daemonset rancher -n cattle-system
NAME      DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                         AGE
rancher   1         1         0       1            0           node-role.kubernetes.io/master=true   6s
root@rancherd-master:/etc/rancher/rke2# kubectl get pod -n cattle-system
NAME            READY   STATUS              RESTARTS   AGE
rancher-56gns   0/1     ContainerCreating   0          13s

8、初始化密碼

root@rancherd-master:/etc/rancher/rke2# rancherd reset-admin
INFO[0002] Server URL: https://my-fixed-registration-address.com:8443 
INFO[0002] Default admin and password created. Username: admin, Password: 4s6chmgj92cfrv2hxvv9vfgq25nw5rwt7kgvx7cpc5kc6jz9wbw82w 

9、打開瀏覽器，輸入 https://my-fixed-registration-address.com:8443 ，設置新admin密碼後正式安裝完成！

三、擴容

通常推薦3臺機器組成master集羣。

1、在新機器新建配置文件/etc/rancher/rke2/config.yaml

server: https://my-fixed-registration-address.com:9345
token: my-shared-secret
tls-san:
  - my-fixed-registration-address.com.

主要區別是增加了sever指向第一臺master

2、執行

curl -sfL https://get.rancher.io | INSTALL_RANCHERD_VERSION=v2.5.9-rc3 sh -
systemctl enable rancherd-server.service
systemctl start rancherd-server.service

3、等待加入完成即可。