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한글 문서 | English Document



k8s-cluster-bootstrap

🔨 An easy and ready-to-go bootstrap for k8s installation and automatic cluster deployment!


Requirements

  • Ubuntu (or ubuntu server) version between 18.04 (inclusive) and 22.04 (inclusive) recommended.
  • Nodes (both master and workers) are to be in the same subnet. For calico autodeployment to work the Master node's IP(Host IP) must not be within the same CIDR.
  • If accessing via ssh, use username/password authentication and not pem.
  • The script automatically opens some ports (such as 6443), but ports may need to be manually opened in case of firewalls or company policies. (ports required to be open for k8s installation)


Usage

1. Bootstrap download

From the home directory, run curl -sSLO http://raw.githubusercontent.com/kdgyun/KubernetesAutoDeployment/main/k8s-cluster-bootstrap.sh or download from github latest release version and run k8s-cluster-bootstrap.sh.


2. File Run Permission

Grant k8s-cluster-bootstrap.sh the following permission:

chmod +x k8s-cluster-bootstrap.sh

3. Execution

Run k8s-cluster-bootstrap.sh with sudo.

sudo ./k8s-cluster-bootstrap.sh [options] <value>

The arguments for [options] are explained below.



Options


The following shows the available options to run this bootstrap.

Option(Flag) Values Description, example Remarks
-c / --cni CIDR Installs cni(with calico) during master node installation. To utilize this option, the master's IP(Host IP) cannot overlap with calico's CIDR. Please utilize one of the following CIDR: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16.
-ct / --containertype Container Runtime Specify the type of container runtime k8s will use. If empty, it will default to docker(cri-docker) For cri-docker write docker ,
for containerd write containerd as the parameter for this option.
-h / --help Display all options and their respective descriptions.
-i / --ip Host IP Declare IP for master node (e.g, 10.0.0.1).
In case of deploying k8s in a cloud (e.g, aws, gcp …) declare an IP with the scope of a private IP, not the public IP.
-kv / --k8sversion Displays all versions of k8s this bootstrap can install
-m / --master Use this option to install a master -m The flag -i/--ip is a must if this option is utilized.
-p / --password Master(Host) node password Required for ssh login using a password.
It is done so the worker node can access the master during installation to obtain the join token. Both master and worker must be in the same subnet.		 The flag -u/--username is a must if this option is utilized.
-r / --regularuser
(*beta)		 HOME_PATH of regular user This bootstrap is executed with sudo permission, thus this option is used to allow regular users (such as the user ubuntu in ubuntu servers) to also use k8s.
run this option as -r /home/username. Crucial that HOME_PATH is the same as the regular user's home directory($HOME)		 Not a must option. Utilized when initializing a master node with -m.
-u / --username Master(Host) node username username for ssh login.
Set so a newly created worker node within the same subnet as the master node can fetch the join token from the master node.		 The floag -p/--password is a must if this option is utilized.
-v / --version k8s version Declare k8s version to install.
Supports k8s version from 1.24.15 to 1.27.5 and more details can be checked using the -kv or --k8sversion option.		 The parameters for this options are to be written as x.y.z.
Not using this option will default k8s version to 1.24.15 and does not support RC nor beta versions since they are not stable versions.
-w / --worker Used to specify worker node installation. the following 3 options are required: -i/--ip , -u/--username, -p/-password.


Executing this bootstrap with no options will only install the packages for k8s (no auto deployment)

In the case that only the packages are install, you can still use the kubeadm init command to manually deploy nodes.

example for installing k8s and deploying a master node:

sudo ./k8s-cluster-bootstrap.sh -m -c 192.168.0.0/16 -i 10.0.0.1 -ct containerd -v 1.25.0

example for installing k8s and deploying a worker node:

sudo ./k8s-cluster-bootstrap.sh -w -i 10.0.0.1 -u username -p pwd123!