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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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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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SOLID

SOLID is the fundamental and core principle of OOP. Single-Responsibility Principle High cohesion: A module preferably has only one business logic. Low coupling:   The different modules work independently and are connected by simple protocols to minimize side effects. Open-Closed Principle Open for extension:  It is easy to extend new functions with existing code. Close for modification:  Do not modify existing classes to ensure stable functions. Liskov-Substitution Principle A superclass should be replaceable with objects of its subclasses without breaking the application. Interface-Segregation Principle Clients only depend on the interfaces they need, don't use the "big" interface to contain everything. Dependence-Inversion Principle The program should depend upon abstractions, not concretions. reference: https://en.wikipedia.org/wiki/SOLID https://blog.knoldus.com/what-is-liskov-substitution-principle-lsp-with-real-world-examples/ https://github.com/hollischuang/toBeTo...
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Annotation

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