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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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Program design template

Designing programs is a common job for every engineer, so templates help simplify the job of designing each program.

Update History

Let everyone know the latest version and update information.

background

Write down why we need this program and what is the background for building this program.

Target

Target functionality

The goal of the program, what function to achieve, the main module and submodule, and these modules' relationship.

Target performance

Specific benchmarks such as QPS or milliseconds to evaluate programs.

Target architecture

Stability.
Readability.
Maintainability.
Extendability.
...

Others Target

Overall design

Design principles and thinking

Explain how and why the program was designed.

Overall architecture

An overall architectural picture.

Dependency

Module dependencies on other modules or programs.

Detail design

Program flow design

Program flow design diagram.

API design

The details of the API, and how to interact with the frontend or backend or modules.

Database design

Concrete SQL syntax.

Implement detail

Explain details not included in the overall design diagram or flowchart.

Compatible design.

Compatible design explanation

Compatible versions between modules, especially whether the client version and server version are compatible.

version dependency

List all version dependencies.

Event Tracking Design

Implementation of program event tracking, how it is collected, and benefits.

Test

The test range

Describe the scope of testing, how many modules, and whether stress testing or stability testing is required.

Test plan

Concrete test cases, including different environments and each test step.

performance test

Test programs under high pressure with large volumes of requests or data.

Online Planning and Risk Assessment

Online Planning

The online version and upgrade steps.

Risk Assessment

If there is a problem with the upgrade, how to deal with it or what are the overall rollback steps.

Unsolved problems

Leaves unsolved or needs discussion questions here.

Schedule and Manpower

attachments

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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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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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Java memeory model

The java memory model has multiple areas to do different jobs, this model is in user space because it has no I/O control. There are these parts: Program counter register: For java multi-thread switching different threads, and same functionality as OS counters. (PC) Registers are created every time a new thread is created. The PC holds a pointer to the current statement being executed in its thread. If the currently executing method is 'native', then the value of the program counter register will be undefined. Stack: Private for each thread. It contains method-specific primitive values and references to objects referenced from methods in the heap. Whenever we call a new method, a new block is created on top of the stack which contains values specific to that method Native Method stacks: JVM that supports native methods will have native method stacks. It is used for native methods, and created per thread.  Heap: Heap data area is used to store objects of classes and arrays....
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