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setting up a kubernetes cluster on centos 7 involves several steps, including preparing your environment, installing the necessary software, and configuring the cluster. below is a comprehensive tutorial that will guide you through the process.

prerequisites

1. **operating system**: centos 7 (minimal installation)
2. **hardware requirements**:
minimum 2 gb ram per node
minimum 2 cpus per node
3. **network**: ensure that nodes can communicate with each other.
4. **root access**: you should have root or sudo access on the nodes.

step 1: prepare the environment

1. disable selinux

selinux can interfere with kubernetes, so it's best to disable it.

```bash
sudo setenforce 0
sudo sed -i 's/^selinux=enforcing/selinux=disabled/' /etc/selinux/config
```

2. disable swap

kubernetes requires swap to be disabled.

```bash
sudo swapoff -a
sudo sed -i '/ swap / s/^//' /etc/fstab
```

3. install required packages

make sure your system is up to date and install necessary packages.

```bash
sudo yum update -y
sudo yum install -y epel-release
sudo yum install -y git curl wget vim net-tools
```

step 2: install docker

kubernetes uses container runtimes to manage containers. docker is a popular choice.

```bash
sudo yum install -y yum-utils
sudo yum-config-manager --add-repo https://download.docker.com/linux/cen...
sudo yum install -y docker-ce docker-ce-cli containerd.io
sudo systemctl start docker
sudo systemctl enable docker
```

configure docker

create a configuration file for docker:

```bash
sudo mkdir /etc/docker
cat eof | sudo tee /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m",
"max-file": "3"
},
"storage-driver": "overlay2"
}
eof
```

restart docker:

```bash
sudo systemctl restart docker
```

step 3: install kubernetes

1. add kubernetes repository

```bash
cat eof | sudo tee /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name= ...

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