Installation Environment Vmware Workstation pro It is recommended to use the snapshot to store the state of each installation stage to avoid installation failures and causing the installation to start from scratch. Ubuntu 22.04 windows 11 Hardware settings create 3 VM: 4 cores and 4G memory and 100G capacity Before installing K8s (All use the root user) set host: 192.168.47.135 master 192.168.47.131 node1 192.168.47.132 node2 set root ssh connection: sudo su - echo "PermitRootLogin yes" >> /etc/ssh/sshd_config systemctl restart sshd sudo passwd ssh-keygen for i in {master,node1,node2}; do ssh-copy-id root@$i; done set Ipvs and conf create conf file: for i in {master,node1,node2}; do ssh root@$i 'cat << EOF > /etc/modules-load.d/containerd.conf overlay br_netfilter EOF'; done execute conf: for i in {master,node1,node2}; do ssh root@$i 'modprobe overlay;modprobe br_netfilter;'; done create 99-kubernetes-cri.conf file: for i in {maste...
Encapsulation
Encapsulation is the process of enclosing all critical information inside, the public method is the only way for other objects to access the data.
The advantages are as follows:
- It protects data and implementation details through access restrictions, and users can only get results without modifying the objects inside.
- It is easy to change the implementation according to requirements because it does not expose the implementation details to the users.
Inheritance
It uses all the features of the parent class and extends the new features itself.
The advantages are as follows:
- It reuses the same code.
- It restricts all child objects to the same business logic as the parent object, but they do not affect each other.
Polymorphism
It executes methods differently by overriding the parent method, especially when the same business logic runs different methods at runtime.
There are two types of Polymorphism:
- Method override.
- Method overloading.
reference:
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