• Notes
  • PI4
  • HTTP
    • Cache relation header
  • Travisci
  • YAML
  • Git
    • Semantic Commit Messages
  • Misc
• Studying
  • AWS
    • Cloudfront
    • ECS capacity provider
    • IAM

Notes

PI4

• Ubuntu mint unoffical

• dd from image to SD

# List disks
$ diskutil list

# Unmount disk
$ diskutil umountDisk /dev/disk2

$ sudo sh -c 'gunzip -c ~/Desktop/ubuntu-18.04.4.img.xz | sudo dd of=/dev/rdisk2 bs=32m'

HTTP

Cache relation header

• Expires

Expires = "Expires" ":" HTTP-date
Expires: Thu, 01 Dec 1994 16:00:00 GMT

if [ cache-control: max-age=N && Expires ], expires should be ignored and using $N

• Cache-control

Reference:

Header Field Definitions

Travisci

• travis.yaml scheme

YAML

https://yaml.org/spec/1.2/spec.html#id2765878

• YAML Parser

• YAML 表示多行的寫法

Git

# Checkout branch
$ git checkout BRANCH

# Checkout file
$ git checkout -- FILE/FOLDER
$ git checkout -- .

## Git > 1.25
$ git restore FILE/FOLDER
$ git switch BRANCH

# Show file modification by line
$ git blame FILE

# Rename branch
$ git branch FROM_BRANCH_NAME TO_BRANCH_NAME

# Merge without FF
$ git merge BRANCH --no-ff

# Reset
$ git reset COMMIT_ID
$ git reset HEAD^ --hard
$ git reset

# Add tag
$ git tag TAG_NAME

# Push tag to remote
$ git push origin TAG_NAME

# One line tag and push remote
$ t=TAG_NAME; git tag $t; git push origin $t

# Delete local tag
$ git tag -d TAG_NAME

# Delete remote tag
$ git push --delete origin TAG_NAME

# Delete remote tag(alternative)
$ git push origin :refs/tags/TAG_NAME

# Delete local branch
$ git branch -D BRANCH_NAME

# Delete remote branch
$ git push origin :cat

branch: 指向某個 commit id. 每個 branch 佔用 40 bytes. 貼紙概念 HEAD: current branch git merge branch : 產生一個 commit id 誰合併誰的差異: 被合併留在原點, 合併會往前

conflict: 修改 conflict 後 git add & git commit

rebase: 把 commit 加在某個 branch 之後

rebase 的好/壞處: good: 線圖清楚 bad: 無法保留歷史紀錄 常用: 在各自branch頻繁修改後 rebase

reset: 將 branch reset(become) 回某個 commit --mixed 差異檔案進工作目錄(default) --soft 差異檔案進暫存區 --hard 丟掉差異

^ : Caret ~ : Tilde

checkout 與 reset 的差異: checkout 只移動 HEAD. reset 會移動 HEAD 與 Branch

commit 無法刪除,看不到還是存在

git reflog: 尋找 HEAD log

https://gitbook.tw/

Semantic Commit Messages

• chore: (updating grunt tasks etc; no production code change)
• docs: (changes to the documentation)
• feat: (new feature for the user, not a new feature for build script)
• fix: (bug fix for the user, not a fix to a build script)
• refactor: (refactoring production code, eg. renaming a variable)
• style: (formatting, missing semi colons, etc; no production code change)
• test: (adding missing tests, refactoring tests; no production code change)

Conventional Commits 1.0.0

Misc

Decrypting SSL/TLS traffic with Wireshark

Studying

AWS

Building serverless applications with the AWS CDK - and testing them locally

Cloudfront

This is How I Reduced My CloudFront Bills by 80%

https://github.com/awsdocs/amazon-cloudfront-developer-guide

ECS capacity provider

Setting existing ecs cluster with capacity provider https://gist.github.com/angusfz/0e5b7838a5c4a1ad236700630a5a8dd7

IAM

IAM policy to grant S3 bucket read access

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Action": [
                "s3:GetObject*",
                "s3:GetBucket*",
                "s3:List*"
            ],
            "Resource": [
                "arn:aws:s3:::iamstack-bucket43879c71-mhdl5a3ebzsh",
                "arn:aws:s3:::iamstack-bucket43879c71-mhdl5a3ebzsh/*"
            ],
            "Effect": "Allow"
        }
    ]
}