Merge pull request #21941 from skycastlelily2/master

Update the guide for Fedora CoreOS

Author: k8s-ci-robot

content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

@@ -191,7 +191,7 @@ sudo apt-mark hold kubelet kubeadm kubectl
 {{% /tab %}}
 {{% tab name="CentOS, RHEL or Fedora" %}}
 ```bash
-cat <<EOF > /etc/yum.repos.d/kubernetes.repo
+cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo
 [kubernetes]
 name=Kubernetes
 baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-\$basearch
@@ -203,12 +203,12 @@ exclude=kubelet kubeadm kubectl
 EOF
 
 # Set SELinux in permissive mode (effectively disabling it)
-setenforce 0
-sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
+sudo setenforce 0
+sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
 
-yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
+sudo yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
 
-systemctl enable --now kubelet
+sudo systemctl enable --now kubelet
 ```
 
   **Notes:**
@@ -220,37 +220,41 @@ systemctl enable --now kubelet
   - You can leave SELinux enabled if you know how to configure it but it may require settings that are not supported by kubeadm.
 
 {{% /tab %}}
-{{% tab name="Container Linux" %}}
+{{% tab name="Fedora CoreOS" %}}
 Install CNI plugins (required for most pod network):
 
 ```bash
 CNI_VERSION="v0.8.2"
-mkdir -p /opt/cni/bin
-curl -L "https://github.com/containernetworking/plugins/releases/download/${CNI_VERSION}/cni-plugins-linux-amd64-${CNI_VERSION}.tgz" | tar -C /opt/cni/bin -xz
+sudo mkdir -p /opt/cni/bin
+curl -L "https://github.com/containernetworking/plugins/releases/download/${CNI_VERSION}/cni-plugins-linux-amd64-${CNI_VERSION}.tgz" | sudo tar -C /opt/cni/bin -xz
+```
+
+Define the directory to download command files  
+
+```bash
+DOWNLOAD_DIR=/usr/local/bin
+sudo mkdir -p $DOWNLOAD_DIR
 ```
 
 Install crictl (required for kubeadm / Kubelet Container Runtime Interface (CRI))
 
 ```bash
 CRICTL_VERSION="v1.17.0"
-mkdir -p /opt/bin
-curl -L "https://github.com/kubernetes-sigs/cri-tools/releases/download/${CRICTL_VERSION}/crictl-${CRICTL_VERSION}-linux-amd64.tar.gz" | tar -C /opt/bin -xz
+curl -L "https://github.com/kubernetes-sigs/cri-tools/releases/download/${CRICTL_VERSION}/crictl-${CRICTL_VERSION}-linux-amd64.tar.gz" | sudo tar -C $DOWNLOAD_DIR -xz
 ```
 
 Install `kubeadm`, `kubelet`, `kubectl` and add a `kubelet` systemd service:
 
 ```bash
 RELEASE="$(curl -sSL https://dl.k8s.io/release/stable.txt)"
-
-mkdir -p /opt/bin
-cd /opt/bin
-curl -L --remote-name-all https://storage.googleapis.com/kubernetes-release/release/${RELEASE}/bin/linux/amd64/{kubeadm,kubelet,kubectl}
-chmod +x {kubeadm,kubelet,kubectl}
+cd $DOWNLOAD_DIR
+sudo curl -L --remote-name-all https://storage.googleapis.com/kubernetes-release/release/${RELEASE}/bin/linux/amd64/{kubeadm,kubelet,kubectl}
+sudo chmod +x {kubeadm,kubelet,kubectl}
 
 RELEASE_VERSION="v0.2.7"
-curl -sSL "https://raw.githubusercontent.com/kubernetes/release/${RELEASE_VERSION}/cmd/kubepkg/templates/latest/deb/kubelet/lib/systemd/system/kubelet.service" | sed "s:/usr/bin:/opt/bin:g" > /etc/systemd/system/kubelet.service
-mkdir -p /etc/systemd/system/kubelet.service.d
-curl -sSL "https://raw.githubusercontent.com/kubernetes/release/${RELEASE_VERSION}/cmd/kubepkg/templates/latest/deb/kubeadm/10-kubeadm.conf" | sed "s:/usr/bin:/opt/bin:g" > /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
+curl -sSL "https://raw.githubusercontent.com/kubernetes/release/${RELEASE_VERSION}/cmd/kubepkg/templates/latest/deb/kubelet/lib/systemd/system/kubelet.service" | sed "s:/usr/bin:${DOWNLOAD_DIR}:g" | sudo tee /etc/systemd/system/kubelet.service
+sudo mkdir -p /etc/systemd/system/kubelet.service.d
+curl -sSL "https://raw.githubusercontent.com/kubernetes/release/${RELEASE_VERSION}/cmd/kubepkg/templates/latest/deb/kubeadm/10-kubeadm.conf" | sed "s:/usr/bin:${DOWNLOAD_DIR}:g" | sudo tee /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
 ```
 
 Enable and start `kubelet`: