docs: Use sudo and tee uniformly everywhere

Added sudo uniformly everywhere it required as it presence doesn't affect anything , but it help new user's of linux , docker or kubernetes who are not much familiar with internals and also for who doesn't read the documentation line by line and use the guides for command reference and just copy paste for their use.

Also , changed  the way of writing or creating files , now using "tee" because previous way gives permission issue for non sudo users.

Author: Rajpratik71

content/en/docs/setup/production-environment/container-runtimes.md

@@ -32,9 +32,6 @@ This document is written for users installing CRI onto Linux. For other operatin
 systems, look for documentation specific to your platform.
 {{< /note >}}
 
-You should execute all the commands in this guide as `root`. For example, prefix commands
-with `sudo `, or become `root` and run the commands as that user.
-
 ### Cgroup drivers
 
 When systemd is chosen as the init system for a Linux distribution, the init process generates
@@ -76,34 +73,34 @@ Use the following commands to install Docker on your system:
 # (Install Docker CE)
 ## Set up the repository:
 ### Install packages to allow apt to use a repository over HTTPS
-apt-get update && apt-get install -y \
+sudo apt-get update && sudo apt-get install -y \
   apt-transport-https ca-certificates curl software-properties-common gnupg2
 ```
 
 ```shell
 # Add Docker's official GPG key:
-curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
 ```
 
 ```shell
 # Add the Docker apt repository:
-add-apt-repository \
+sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"
 ```
 
 ```shell
 # Install Docker CE
-apt-get update && apt-get install -y \
+sudo apt-get update && sudo apt-get install -y \
   containerd.io=1.2.13-2 \
   docker-ce=5:19.03.11~3-0~ubuntu-$(lsb_release -cs) \
   docker-ce-cli=5:19.03.11~3-0~ubuntu-$(lsb_release -cs)
 ```
 
 ```shell
 # Set up the Docker daemon
-cat > /etc/docker/daemon.json <<EOF
+cat <<EOF | sudo tee /etc/docker/daemon.json
 {
   "exec-opts": ["native.cgroupdriver=systemd"],
   "log-driver": "json-file",
@@ -116,13 +113,13 @@ EOF
 ```
 
 ```shell
-mkdir -p /etc/systemd/system/docker.service.d
+sudo mkdir -p /etc/systemd/system/docker.service.d
 ```
 
 ```shell
 # Restart Docker
-systemctl daemon-reload
-systemctl restart docker
+sudo systemctl daemon-reload
+sudo systemctl restart docker
 ```
 {{% /tab %}}
 {{% tab name="CentOS/RHEL 7.4+" %}}
@@ -131,31 +128,31 @@ systemctl restart docker
 # (Install Docker CE)
 ## Set up the repository
 ### Install required packages
-yum install -y yum-utils device-mapper-persistent-data lvm2
+sudo yum install -y yum-utils device-mapper-persistent-data lvm2
 ```
 
 ```shell
 ## Add the Docker repository
-yum-config-manager --add-repo \
+sudo yum-config-manager --add-repo \
   https://download.docker.com/linux/centos/docker-ce.repo
 ```
 
 ```shell
 # Install Docker CE
-yum update -y && yum install -y \
+sudo yum update -y && sudo yum install -y \
   containerd.io-1.2.13 \
   docker-ce-19.03.11 \
   docker-ce-cli-19.03.11
 ```
 
 ```shell
 ## Create /etc/docker
-mkdir /etc/docker
+sudo mkdir /etc/docker
 ```
 
 ```shell
 # Set up the Docker daemon
-cat > /etc/docker/daemon.json <<EOF
+cat <<EOF | sudo tee /etc/docker/daemon.json
 {
   "exec-opts": ["native.cgroupdriver=systemd"],
   "log-driver": "json-file",
@@ -171,13 +168,13 @@ EOF
 ```
 
 ```shell
-mkdir -p /etc/systemd/system/docker.service.d
+sudo mkdir -p /etc/systemd/system/docker.service.d
 ```
 
 ```shell
 # Restart Docker
-systemctl daemon-reload
-systemctl restart docker
+sudo systemctl daemon-reload
+sudo systemctl restart docker
 ```
 {{% /tab %}}
 {{< /tabs >}}
@@ -205,17 +202,17 @@ For more information, see the [CRI-O compatibility matrix](https://github.com/cr
 ### Prerequisites
 
 ```shell
-modprobe overlay
-modprobe br_netfilter
+sudo modprobe overlay
+sudo modprobe br_netfilter
 
 # Set up required sysctl params, these persist across reboots.
-cat > /etc/sysctl.d/99-kubernetes-cri.conf <<EOF
+cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
 net.bridge.bridge-nf-call-iptables  = 1
 net.ipv4.ip_forward                 = 1
 net.bridge.bridge-nf-call-ip6tables = 1
 EOF
 
-sysctl --system
+sudo sysctl --system
 ```
 
 {{< tabs name="tab-cri-cri-o-installation" >}}
@@ -237,14 +234,18 @@ To install version 1.18.3, set `VERSION=1.18:1.18.3`.
 
 Then run
 ```shell
-echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
-echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
+cat <<EOF | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
+"deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /"
+EOF
+cat <<EOF | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
+"deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /"
+EOF
 
-curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | apt-key add -
-curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | apt-key add -
+curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | sudo apt-key add -
+curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | sudo apt-key add -
 
-apt-get update
-apt-get install cri-o cri-o-runc
+sudo apt-get update
+sudo apt-get install cri-o cri-o-runc
 ```
 
 {{% /tab %}}
@@ -269,14 +270,14 @@ To install version 1.18.3, set `VERSION=1.18:1.18.3`.
 
 Then run
 ```shell
-echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
-echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
+sudo echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
+sudo echo "deb http://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable:/cri-o:/$VERSION/$OS/ /" > /etc/apt/sources.list.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.list
 
-curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | apt-key add -
-curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | apt-key add -
+curl -L https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/Release.key | sudo apt-key add -
+curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/Release.key | sudo apt-key add -
 
-apt-get update
-apt-get install cri-o cri-o-runc
+sudo apt-get update
+sudo apt-get install cri-o cri-o-runc
 ```
 {{% /tab %}}
 
@@ -299,9 +300,9 @@ To install version 1.18.3, set `VERSION=1.18:1.18.3`.
 
 Then run
 ```shell
-curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable.repo https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/devel:kubic:libcontainers:stable.repo
-curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo
-yum install cri-o
+sudo curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable.repo https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/$OS/devel:kubic:libcontainers:stable.repo
+sudo curl -L -o /etc/yum.repos.d/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo https://download.opensuse.org/repositories/devel:kubic:libcontainers:stable:cri-o:$VERSION/$OS/devel:kubic:libcontainers:stable:cri-o:$VERSION.repo
+sudo yum install cri-o
 ```
 
 {{% /tab %}}
@@ -318,14 +319,14 @@ Set `$VERSION` to the CRI-O version that matches your Kubernetes version.
 For instance, if you want to install CRI-O 1.18, `VERSION=1.18`                                                                                                                                                                               
 You can find available versions with:
 ```shell
-dnf module list cri-o
+sudo dnf module list cri-o
 ```
 CRI-O does not support pinning to specific releases on Fedora.
 
 Then run
 ```shell
-dnf module enable cri-o:$VERSION
-dnf install cri-o
+sudo dnf module enable cri-o:$VERSION
+sudo dnf install cri-o
 ```
 
 {{% /tab %}}
@@ -334,8 +335,8 @@ dnf install cri-o
 ### Start CRI-O
 
 ```shell
-systemctl daemon-reload
-systemctl start crio
+sudo systemctl daemon-reload
+sudo systemctl start crio
 ```
 
 Refer to the [CRI-O installation guide](https://github.com/kubernetes-sigs/cri-o#getting-started)
@@ -350,22 +351,22 @@ Use the following commands to install Containerd on your system:
 ### Prerequisites
 
 ```shell
-cat > /etc/modules-load.d/containerd.conf <<EOF
+cat <<EOF | sudo tee /etc/modules-load.d/containerd.conf
 overlay
 br_netfilter
 EOF
 
-modprobe overlay
-modprobe br_netfilter
+sudo modprobe overlay
+sudo modprobe br_netfilter
 
 # Setup required sysctl params, these persist across reboots.
-cat > /etc/sysctl.d/99-kubernetes-cri.conf <<EOF
+cat <<EOF | sudo tee /etc/sysctl.d/99-kubernetes-cri.conf
 net.bridge.bridge-nf-call-iptables  = 1
 net.ipv4.ip_forward                 = 1
 net.bridge.bridge-nf-call-ip6tables = 1
 EOF
 
-sysctl --system
+sudo sysctl --system
 ```
 
 ### Install containerd
@@ -377,36 +378,36 @@ sysctl --system
 # (Install containerd)
 ## Set up the repository
 ### Install packages to allow apt to use a repository over HTTPS
-apt-get update && apt-get install -y apt-transport-https ca-certificates curl software-properties-common
+sudo apt-get update && sudo apt-get install -y apt-transport-https ca-certificates curl software-properties-common
 ```
 
 ```shell
 ## Add Docker's official GPG key
-curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
 ```
 
 ```shell
 ## Add Docker apt repository.
-add-apt-repository \
+sudo add-apt-repository \
     "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
     $(lsb_release -cs) \
     stable"
 ```
 
 ```shell
 ## Install containerd
-apt-get update && apt-get install -y containerd.io
+sudo apt-get update && sudo apt-get install -y containerd.io
 ```
 
 ```shell
 # Configure containerd
-mkdir -p /etc/containerd
-containerd config default > /etc/containerd/config.toml
+sudo mkdir -p /etc/containerd
+sudo containerd config default > /etc/containerd/config.toml
 ```
 
 ```shell
 # Restart containerd
-systemctl restart containerd
+sudo systemctl restart containerd
 ```
 {{% /tab %}}
 {{% tab name="CentOS/RHEL 7.4+" %}}
@@ -415,30 +416,30 @@ systemctl restart containerd
 # (Install containerd)
 ## Set up the repository
 ### Install required packages
-yum install -y yum-utils device-mapper-persistent-data lvm2
+sudo yum install -y yum-utils device-mapper-persistent-data lvm2
 ```
 
 ```shell
 ## Add docker repository
-yum-config-manager \
+sudo yum-config-manager \
     --add-repo \
     https://download.docker.com/linux/centos/docker-ce.repo
 ```
 
 ```shell
 ## Install containerd
-yum update -y && yum install -y containerd.io
+sudo yum update -y && sudo yum install -y containerd.io
 ```
 
 ```shell
 ## Configure containerd
-mkdir -p /etc/containerd
-containerd config default > /etc/containerd/config.toml
+sudo mkdir -p /etc/containerd
+sudo containerd config default > /etc/containerd/config.toml
 ```
 
 ```shell
 # Restart containerd
-systemctl restart containerd
+sudo systemctl restart containerd
 ```
 {{% /tab %}}
 {{% tab name="Windows (PowerShell)" %}}