环境安装篇之安装kubevela

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本文是环境安装系列文章，介绍 oam规范标准实施项目 kubevela 的安装详细步骤
kubevela 官方安装文档：https://kubevela.io/zh/docs/installation/kubernetes/

1.CentOS 安装kubevela

1.1.前提：已安装docker

要求已经安装了docker，没有安装的可以参考：
- 环境安装篇之 docker安装

1.2.安装kubevela

安装kubevela
- kubevela会内置一个kubernetes环境，所以你不需要实现安装 kubernetes
```
curl -fsSl https://kubevela.io/script/install.sh | bash
vela install
```

1.3.安装kubectl

虽然kubevela会内置一个kubernetes环境，但是没有安装kubectl，需要手动安装

$ curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
$ curl -LO "https://dl.k8s.io/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"
$ echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check
$ install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl

kubevela内置的集群，集群kubeconfig文件是 /etc/rancher/k3s/k3s.yaml
如果你的kubectl无法找到集群，就将该文件复制一份为 ~/.kube/config
```
cp /etc/rancher/k3s/k3s.yaml ~/.kube/config
```

1.4.可能遇到的问题

安装过程如果报错：

[ERROR]  Failed to find the k3s-selinux policy, please install:
    yum install -y container-selinux
    yum install -y https://rpm.rancher.io/k3s/stable/common/centos/7/noarch/

Error: Fail to set up cluster: fail to setup k3s: K3s install script failed: exit status 1

按照提示执行两条yum命令，安装 container-selinux 和 k3s-selinux
从上面的报错看，第二条yum命令，日志其实没有打印全(我也不知道为啥)，https://rpm.rancher.io/k3s/stable/common/centos/7/noarch/ 是错误的，直接执行会提示找不到包

centos7，可以执行这个命令

yum install -y https://rpm.rancher.io/k3s/stable/common/centos/7/noarch/k3s-selinux-1.2-2.el8.noarch.rpm

解决问题后，重新执行 vela install 即可

1.5.安装velaux：kubevela UI控制台

1.5.1.根据kubevela安装成功提示安装velaux

安装成功的提示信息如下：

[root@kubevela go]# velad install
Preparing cluster setup script...
Saving temporary file: k3s-setup-*.sh
Preparing k3s binary...
Saving k3s binary to /usr/local/bin/k3s
Successfully place k3s binary to /usr/local/bin/k3s
Preparing k3s images
Making directory /var/lib/rancher/k3s/agent/images/
Saving K3s air-gap install images to /var/lib/rancher/k3s/agent/images/k3s-airgap-images.tar.gz
Successfully prepare k3s image
Setting up cluster
/bin/bash /root/.vela/tmp/k3s-setup-445017089.sh --node-name=default
[INFO]  Skipping k3s download and verify
[INFO]  Skipping installation of SELinux RPM
[INFO]  Skipping /usr/local/bin/kubectl symlink to k3s, already exists
[INFO]  Creating /usr/local/bin/crictl symlink to k3s
[INFO]  Skipping /usr/local/bin/ctr symlink to k3s, command exists in PATH at /usr/bin/ctr
[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 from /etc/systemd/system/multi-user.target.wants/k3s.service to /etc/systemd/system/k3s.service.
[INFO]  systemd: Starting k3s
Successfully setup cluster
Checking and installing vela CLI...
vela CLI is not installed, installing...
Installing vela CLI at:  /usr/local/bin/vela
Successfully install vela CLI
Saving and temporary image file: vela-image-cluster-gateway-*.tar
Importing image to cluster using temporary file: vela-image-cluster-gateway-*.tar
unpacking docker.io/oamdev/cluster-gateway:v1.9.0-alpha.2 (sha256:a9baa41c62762dea9cccefeed0ef1a479b695f7af847ecf7df0ab6b6ecf4e8c5)...done
Successfully import image /root/.vela/tmp/vela-image-cluster-gateway-2792909328.tar
Saving and temporary image file: vela-image-kube-webhook-certgen-*.tar
Importing image to cluster using temporary file: vela-image-kube-webhook-certgen-*.tar
unpacking docker.io/oamdev/kube-webhook-certgen:v2.4.1 (sha256:089374ef23e1d268f138d742b8af056ee1af51bb4863f6a19cde0634068eaa91)...done
Successfully import image /root/.vela/tmp/vela-image-kube-webhook-certgen-4078663359.tar
Saving and temporary image file: vela-image-vela-core-*.tar
Importing image to cluster using temporary file: vela-image-vela-core-*.tar
unpacking docker.io/oamdev/vela-core:v1.9.5 (sha256:fbff76625847c1183dd371f5fc9acbbd3c33c348faf12984eaae433b1244f454)...done
Successfully import image /root/.vela/tmp/vela-image-vela-core-222878440.tar
Saving and temporary image file: vela-image-velaux-*.tar
Importing image to cluster using temporary file: vela-image-velaux-*.tar
unpacking docker.io/oamdev/velaux:v1.9.2 (sha256:9e1a8810c429fb651807efde0542778143fb5428732d9c9839310eb949d5d97d)...done
Successfully import image /root/.vela/tmp/vela-image-velaux-3157703049.tar
Saving and temporary helm chart file: vela-core-*.tgz
open the tar to tmpDir /root/.vela/tmp
Copy velaux-v1.9.2.tgz file to /root/.vela/addons/velaux-v1.9.2.tgz
Extracting /root/.vela/addons/velaux-v1.9.2.tgz to /root/.vela/addons/velaux
Installing vela-core Helm chart...
Executing "vela install --file /root/.vela/tmp/vela-core --detail=false --version v1.9.5 --set= --namespace=vela-system "

Check Requirements ...
Installing KubeVela Core ...
Helm Chart used for KubeVela control plane installation: /root/.vela/tmp/vela-core
I0320 23:26:51.273741   19017 apply.go:126] "creating object" name="applicationrevisions.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.324160   19017 apply.go:126] "creating object" name="applications.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.347480   19017 apply.go:126] "creating object" name="componentdefinitions.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.384335   19017 apply.go:126] "creating object" name="definitionrevisions.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.410499   19017 apply.go:126] "creating object" name="policies.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.474147   19017 apply.go:126] "creating object" name="policydefinitions.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.503579   19017 apply.go:126] "creating object" name="resourcetrackers.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.518233   19017 apply.go:126] "creating object" name="traitdefinitions.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.539290   19017 apply.go:126] "creating object" name="workflows.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.559766   19017 apply.go:126] "creating object" name="workflowstepdefinitions.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
I0320 23:26:51.581942   19017 apply.go:126] "creating object" name="workloaddefinitions.core.oam.dev" resource="apiextensions.k8s.io/v1, Kind=CustomResourceDefinition"
Start upgrading Helm Chart kubevela in namespace vela-system

KubeVela control plane has been successfully set up on your cluster.
If you want to enable dashboard, please run "vela addon enable /root/.vela/addons/velaux"
Modifying the built-in gateway definition...

Keep the token below if you want to restart the control plane
K10753a9d09167f265c6f72e2cf3d453da9df7099d9e8fad7002a4b397f843491e0::server:4548ddd54b195c9d4f85e85e9d81d87a

🚀 Successfully install KubeVela control plane
💻 When using gateway trait, you can access with 127.0.0.1
🔭 See available commands with `vela help`
💡 To enable dashboard, run `vela addon enable /root/.vela/addons/velaux`
🔑 To access the cluster, set KUBECONFIG:
    export KUBECONFIG=$(velad kubeconfig --name default --host)

根据提示，可知道，执行 vela addon enable /root/.vela/addons/velaux 可以安装velaux，即kubevela的UI控制台

[root@kubevela go]# vela addon enable /root/.vela/addons/velaux
enabling addon by local dir: /root/.vela/addons/velaux
Addon velaux enabled successfully.
Please access addon-velaux from the following endpoints:
+---------+---------------+-----------------------------------+--------------------------------+-------+
| CLUSTER |   COMPONENT   |     REF(KIND/NAMESPACE/NAME)      |            ENDPOINT            | INNER |
+---------+---------------+-----------------------------------+--------------------------------+-------+
| local   | velaux-server | Service/vela-system/velaux-server | velaux-server.vela-system:8000 | true  |
+---------+---------------+-----------------------------------+--------------------------------+-------+
    To open the dashboard directly by port-forward:

    vela port-forward -n vela-system addon-velaux 8000:8000

    Please refer to https://kubevela.io/docs/reference/addons/velaux for more VelaUX addon installation and visiting method.

1.5.2.使用NodePort方式安装velaux

如果是在虚拟机中，使用1.4.1中安装的velaux，外界机器上是无法访问的，可以使用NodePort方式安装velaux

[root@kubevela go]# vela addon enable velaux serviceType=NodePort
Addon velaux enabled successfully.
Please access addon-velaux from the following endpoints:
+---------+---------------+-----------------------------------+-----------------------+-------+
| CLUSTER |   COMPONENT   |     REF(KIND/NAMESPACE/NAME)      |       ENDPOINT        | INNER |
+---------+---------------+-----------------------------------+-----------------------+-------+
| local   | velaux-server | Service/vela-system/velaux-server | 192.168.245.151:30000 | false |
+---------+---------------+-----------------------------------+-----------------------+-------+
    To open the dashboard directly by port-forward:

    vela port-forward -n vela-system addon-velaux 8000:8000

    Please refer to https://kubevela.io/docs/reference/addons/velaux for more VelaUX addon installation and visiting method.

根据结果可知，通过 192.168.245.151:30000 可以访问 VelaUX
VelaUX，默认账号：admin，密码：VelaUX12345