golang 類似 override 概念的東東

package main

import (

"fmt"
)

type I interface {
Fa()
Fb()
}
type C1 struct {
}
func (c *C1) Fa() {
fmt.Println("C1.Fa()")
}
func (c *C1) Fb() {
fmt.Println("C1.Fb()")
}
type C2 struct {
C1
}
func (c *C2) Fb() {
fmt.Println("C2.Fb()")
}
func main() {
c1 := C1{}
c1.Fa()
c1.Fb()
c2 := C2{}
c2.Fa()
c2.Fb()
c2.C1.Fb()
}

Install MySQL on Ubuntu 20.04

sudo apt update
sudo apt install mysql-server
sudo systemctl status mysql
sudo mysql_secure_installation

sudo mysql

SHOW VARIABLES LIKE 'validate_password%';

SET global validate_password.length=4;

CREATE USER 'kh'@'localhost' IDENTIFIED BY '1234';

DROP USER 'kh'@'localhost';

CREATE USER 'kh'@'192.168.50.219' IDENTIFIED BY '1234';

DROP USER 'kh'@'192.168.50.219';

# 請參考下方的允許遠端存取

CREATE USER 'kh'@'%' IDENTIFIED BY '1234';

DROP USER 'kh'@'%';

# REVOKE ALL ON *.* FROM 'kh'@'localhost';

GRANT CREATE, ALTER, DROP, INSERT, UPDATE, DELETE, SELECT, REFERENCES, RELOAD on *.* TO 'kh'@'localhost';

GRANT CREATE, ALTER, DROP, INSERT, UPDATE, DELETE, SELECT, REFERENCES, RELOAD on *.* TO 'kh'@'192.168.50.219';

GRANT CREATE, ALTER, DROP, INSERT, UPDATE, DELETE, SELECT, REFERENCES, RELOAD on *.* TO 'kh'@'%';

FLUSH PRIVILEGES;
SHOW GRANTS FOR 'kh'@'localhost';

source /home/kh/XXX/scripts/mysql.sql;

EXIT

mysql -u kh -p

# ref:
# https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-20-04

允許遠端存取：

• sudo nano /etc/mysql/mysql.conf.d/mysqld.cnf

bind-address = 0.0.0.0

• sudo systemctl restart mysql

• ref：
• https://www.digitalocean.com/community/tutorials/how-to-allow-remote-access-to-mysql

ubuntu 新酷音 中文輸入法

 sudo apt install ibus-chewing

ubuntu sudo 免密碼 - visudo

 sudo visudo

%sudo   ALL=(ALL:ALL) NOPASSWD:ALL

myuser ALL=(ALL:ALL) NOPASSWD:ALL

       kh ALL=(ALL:ALL) NOPASSWD:ALL

順序有差 建議放最後

Jenkins 與 Github 重點筆記

GitHub 帳號申請 Personal access tokens 

Developer settings → Personal access tokens

放到 Jenkins 的GitHub Plugin設定那邊

Manage Jenkins → Configure System → GitHub

Add → Add Credentials → Kind → Secret text → 貼上剛剛申請到的access token

-----

到 GitHub Repo 設定：

 GitHub的Webhooks (http://xxx.yyy.zzz:8080/github-webhook/)

 GitHub的deployee key 設定 public key

到Jenkins設定private key

主機記得裝git

Credentials新增SSH private key

(頭尾那兩行也要進去"-----BEGIN RSA PRIVATE KEY-----" "-----END RSA PRIVATE KEY-----")

參考資料：

https://medium.com/@BuzonXXXX/ci-%E8%A8%AD%E5%AE%9Ajenkins%E9%80%A3%E7%B5%90github-private-repo-111c53d29047

http://mis101bird.js.org/cd/

使用 Docker 安裝 Jenkins

指令：

sudo docker network create jenkins
sudo docker volume create jenkins-data
sudo docker volume create jenkins-docker-certs

sudo docker container run \
  --name jenkins-docker \
  --rm \
  --detach \
  --privileged \
  --network jenkins \
  --network-alias docker \
  --env DOCKER_TLS_CERTDIR=/certs \
  --volume jenkins-docker-certs:/certs/client \
  --volume jenkins-data:/var/jenkins_home \
  --publish 2376:2376 \
  docker:dind

sudo docker container run \
  --name jenkins-blueocean \
  --rm \
  --detach \
  --network jenkins \
  --env DOCKER_HOST=tcp://docker:2376 \
  --env DOCKER_CERT_PATH=/certs/client \
  --env DOCKER_TLS_VERIFY=1 \
  --publish 8080:8080 \
  --publish 50000:50000 \
  --volume jenkins-data:/var/jenkins_home \
  --volume jenkins-docker-certs:/certs/client:ro \
  jenkinsci/blueocean


sudo docker exec jenkins-blueocean cat /var/jenkins_home/secrets/initialAdminPassword

參考資料：

https://blog.cloudware.bg/en/what-is-jenkins-and-how-to-install-it-on-your-server/

https://davelms.medium.com/run-jenkins-in-a-docker-container-part-1-docker-in-docker-7ca75262619d

https://www.cnblogs.com/esofar/p/11163583.html

sudo 免密碼

sudo visudo

在最後面加入

myuser ALL=(ALL) NOPASSWD: ALL for a single user

%sudo  ALL=(ALL) NOPASSWD: ALL for a group.

注意：config的順序會影響，所以要放在最後面

Debian 啟用 root 帳號

sudo passwd root

sudo passwd -- unlock root

Ref：https://www.taiwaniot.com.tw/%E6%8A%80%E8%A1%93%E6%96%87%E4%BB%B6/%E6%A8%B9%E8%8E%93%E6%B4%BE%E6%8A%80%E8%A1%93%E6%96%87%E4%BB%B6/%E6%A8%B9%E8%8E%93%E6%B4%BE%EF%BC%88raspberry%EF%BC%89%E5%95%9F%E7%94%A8root-%E5%B8%B3%E8%99%9F/

備份到NAS

備份到 Samba 的指令

robocopy  D:  \\192.168.50.100\nas_900g\E3_Disk-D_Backup  /mt  /mir

如果要管理登入身分的話 可到：

控制台\使用者帳戶\認證管理員

優雅的Code

Golang 安裝 筆記

環境：

ubuntu 20.04.2.0 LTS

go 1.16.3

vscode

安裝指令：

先到官網下載壓縮檔

sudo tar -C /usr/local -xzf go1.16.3.linux-amd64.tar.gz

vim ~/.bashrc 

# golang

export GOROOT=/usr/local/go

export GOPATH=$HOME/go

export PATH=$GOPATH/bin:$GOROOT/bin:$PATH

source ~/.bashrc

reboot

go env -w GO111MODULE=off

範例程式：

package main

import "fmt"

 

func main() {

     fmt.Println("Hello, World!")

}