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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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Redis

 

Redis

To improve response time and avoid the burden on the database, caching is a commonly used tool, and Redis is the most famous and best caching tool.

Basic Operation

SRING

Save string, integer or double.

LIST

Linked list, we can prune nodes like list or queue.

SET

Like HashSet, the values ​​in the set are unique.

HASH

Often objects with multiple properties are saved.

ZSET

Same as linked hashmap, with orderliness.

Advanced Operation

Math operation.
Element operations, such as union and heteroset.
Key operations such as checking existence or getting all keys.
Key expire operation.

Backup

RDB

Snapshot of all data, fast recovery.

AOF

Operation log appending, recovery is slow.

Backup thread operations

save: the operation will stop the client threads.
bgsave: the operation add new a thread to do backup.

After redis4.0, you can use rewrite Aof with Rdb + Aof to reduce recovery time and save volume.

Usage

Single

Testing or basic use of small machines.

Master-slave

Can withstand more operations than smaller machines.

Sentinel

A service that can automatically monitor and switch between master and slave.

Cluster

It has all the functions of master-slave and sentinel, and can easily add or delete nodes.


Distributed lock

In microservices, to avoid inventory problems caused by concurrency, distributed locks are needed to ensure that inventory can be added or subtracted correctly.

Gossip protocol

https://en.wikipedia.org/wiki/Gossip_protocol

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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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Garbage Collectors

Table of contents [ hide ] The JVM ships with various options for garbage collection to support a variety of deployment options. With this, we get flexibility in choosing which garbage collector to use for our application. Serial GC The Serial collector uses a single thread for garbage collection. The serial collector is not even that powerful compared to other GCs but is useful in a uniprocessor or hardware-constrained environments. ParNew  GC  The parallel version of the Serial collector, before the emergence of G1 GC, the combination of ParNew and CMS worked together, and ParNew was responsible for the garbage collection of the new generation. Parallel Scavenge  GC  Aa a young generation GC, compare to other GCs, focuses on the throughput, and another important feature is the auto adjustment strategy to find the best throughput and pause time. Serial Old GC Serial Old GC is for the old-generation version of Serial GC. It has two purposes, one is to work with...
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JVM Tools

Table of contents [ hide ]  Java has many useful tools for debugging at runtime or analyzing an application after it has crashed. Commands jps - JVM process Status Tool Same as the Linux command ps, only to find the process under the JVM. jinfo - Configuration Info for Java Show and adjust the JVM arguments. jmap - Memory Map for Java Getting a memory error dump is the most common technique used at runtime. The dump file can be used to analyze the cause of the failure. jstack - Stack trace for Java Check the thread runtime status. GUI VisualVM VisualVM is a tool that provides a visual interface for viewing detailed information about Java applications while they are running on a Java Virtual Machine (JVM). Memory Analyzer (MAT) The Eclipse Memory Analyzer is a fast and feature-rich Java heap analyzer that helps you find memory leaks and reduce memory consumption. reference: https://www.amazon.com/depth-understanding-Java-Virtual-Machine/dp/7111641248 https://en.wikipedia.org/w...
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