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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...

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

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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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Table of contents [ hide ] Mongo DB An open-source NoSQL file database. Due to the use of JSON document data storage structure, MongoDB has three advantages: flexibility, easy expansion, and high performance. Compared with traditional relational databases, users do not need to define the data structure in advance when using MongoDB to store data, and can freely add the Key/Value of the data. Basic concept SQL vs MongoDB Database vs Database Table vs Collection Row vs Document Column vs Field Index vs Index Primary key vs _id View vs View Table Joins vs $lookup Query Syntax Example SQL vs MongoDB a = 1 vs {a: 1} a<> 1 vs {a: {$ne: 1}} a > 1 vs {a: {$gt: 1}} a >= 1 vs {a: {$gte: 1}} a < 1 vs {a: {$lt: 1}} a <= 1 vs {a: {$lte: 1}} Aggregation  Pipeline Stages Description: Mongo DB vs SQL Filter criteria: $match vs where Projection: $project vs as Left outer join: $lookup vs left outer join Sort: $sort vs order by Group: $group vs group by Pagination: $skip/$limi...

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