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Install K8S on VM and spring boot integration.

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...
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Three major features of object-oriented

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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OS basic

Table of contents [ hide ] OS architecture The operating system architecture consists of three parts, user mode, kernel mode, and hardware. User mode is for the application to execute the user's program. Kernel mode is to control all the I/O devices and system stability. Storage device hierarchy System call The system call is a kind of software interrupt, including six categories. Process control. File management. Device management. Information maintenance. Communication. Protection. System calls use three methods to pass parameters. Registers. The table in memory. Push onto the stack. A view of operating system services reference: https://www.amazon.com/-/zh_TW/Operating-System-Concepts-Abraham-Silberschatz/dp/1119800366/ref=sr_1_1?keywords=Operating-System-Concepts&qid=1669538704&s=books&sr=1-1
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Process

Table of contents [ hide ] A process is a program that is executed in memory. Process layout A process includes: Code segment. Data section-global variables. Stack-temporary local variables and functions. Heap-dynamic allocated variables or classes. Current activity(program counter, register contents). A set of associated resources. Process status Process control block A process control block (PCB) is the kernel data structure that represents a process in an operating system.   Context switch means the kernel saves the state of the old process and loads the saved state for the new process. Process state. Program counter. Cpu register. Cou scheduling. Memory-management information. I/O status information. Accounting information. Process Schedulers Short-term(CPU scheduler) Selects which process should be executed and allocated CPU(ready state -> run state). Long-term(job scheduler) Selects which processes should be loaded into memory and brought into the ready queue(ne...
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Cpu scheduling

Table of contents [ hide ] Basic concept The idea of multiprogramming: Keep several processes in memory. Every time one process has to wait, another process takes over the use of the CPU. CPU-I/O burst cycle: Process execution consists of a cycle of CPU execution and I/O wait(i.e., CPU burst and I/O burst). Generally, there is a large number of short CPU bursts and a small number of long CPU bursts An I/O-bound program would typically have many very short CPU bursts. A CPU-bound program might have a few long CPU bursts. CPU scheduler Select from the ready queue to execute(I.e allocates an APU for the selected process) CPU scheduling  decision may take place when a process: Switch from running to waiting state. Switch from running to ready state. Switch from waiting to ready. Terminates. Non-preemptive scheduling: Scheduling under 1 and 4(no choice in terms of scheduling). The process keeps the CPU until it is terminated or switched to the waiting state. Preemptive schedul...
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