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...
Design pattern
Annotations are an implementation of the decorator design pattern.
The decorator pattern is a design pattern that allows behavior to be added to an individual object, dynamically, without affecting the behavior of other objects from the same class.
Annotations in Java
Annotations, a form of metadata, provide data about a program that is not part of the program itself. Annotations have no direct effect on the operation of the code they annotate.
Annotations have a number of uses:
- Information for the compiler: Annotations can be used by the compiler to detect errors or suppress warnings
- Compile-time and deployment-time processing: Software tools can process annotation information to generate code, XML files, and so forth.
- Runtime processing: Some annotations are available to be examined at runtime.
Annotations in Spring
Spring uses annotations extensively as a core feature, especially Spring AOP, and almost all the functions we use in Spring rely on Spring annotations.
Essentially, it is a way for adding behavior to existing code without modifying that code.
reference:
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