docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

 Issue:

docker: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

Fix:

• sudo update-alternatives --config iptables
• choose 1 : "/usr/sbin/iptables-legacy"
• sudo service docker start
• sudo service docker status

Generate Strong Password Using Bash Script

• upper alphabeth
• lower alphabeth
• number
• symbol
  
  

then combine and shuffle mix using Bash

pass1="$(head /dev/urandom | tr -dc 'A-Z' | head -c3)" # upper alphabeth
pass2="$(head /dev/urandom | tr -dc 'a-z' | head -c3)" # lower alphabeth
pass3="$(head /dev/urandom | tr -dc '0-9' | head -c3)" # number
pass4="$(head /dev/urandom | tr -dc '!@#$%^&*()' | head -c3)" # symbol
password=$pass1$pass2$pass3$pass4
mixed_password=$(echo "$password" | fold -w1 | shuf | tr -d '\n')
echo $mixed_password

git command for recreate feature branch

git command for recreate feature branch

git branch from tags

git branch mybranch001 tags/v1.0.0
git checkout mybranch001
git cherry-pick xxx
git branch --set-upstream-to=origin/mybranch001
git push --force-with-lease

Powershell Append or Add Text into File

Powershell Append or Add Text into File

- Without Get-Content

- Dynamic call/execute command

$text = "texthere"
$cmd = "Add-Content -Path C:\xxx.txt -Value ""$text"""
for ($i = 0; $i -lt 1000; $i++) { Invoke-Expression $cmd }

AWS CLI using Role and MFA

 AWS CLI using Role and MFA

1. Setting AWS CLI Credential location : ~/.aws/credentials

[myuser]
aws_access_key_id = xxxx
aws_secret_access_key = xxxx

2. Setting AWS CLI Config location : ~/.aws/config

[profile myusermfa]
region = yourregion
role_arn = arn:aws:iam::xxAccountIDxx:role/xxRoleNamexx
source_profile = myuser
mfa_serial = arn:aws:iam::xxAccountIDxx:mfa/myuser
role_session_name = Session_MyUser_MFA

3. Access AWS CLI using profile

aws s3 ls s3:// --profile=myuser

Powershell Remove-Item Fast

Remove item in Windows via GUI will take some time because it will scan all files before delete.

To speed up time, we don't need to scan it.
One of fast method is using Powershell

Remove-Item -path ./* -recurse

AWS S3 How to Find Files with by Keyword

open cmd
run command :

aws s3api list-objects --bucket BUCKETNAME --prefix FOLDERNAME1/FOLDERNAME2/ --output json --query "Contents[?contains(Key, `SearchKeyword`)]"

---

How to sum :

aws s3api list-objects --bucket BUCKETNAME --prefix FOLDERNAME1/FOLDERNAME2/ --output json --query "[sum(Contents[?contains(Key, `SearchKeyword`)].Size), length(Contents[?contains(Key, `SearchKeyword`)])]"

AWS S3 How to Count Folder Size

open cmd
run command :

aws s3api list-objects --bucket BUCKETNAME --prefix FOLDERNAME1/FOLDERNAME2/ --output json --query "[sum(Contents[].Size), length(Contents[])]"

AWS cannot login RDP - Must change password before log in

AWS cannot login RDP - Must change password before log in

Error : "You must change your password before logging on the first time"

1. Open RDP
2. Connection Setting : click "Save As"
3. Save *.rdp file
4. Edit *.rdp file : add : enablecredsspsupport:i:0
5. Open RDP
6. Change password (with password policy)

How to delete files in folder using powershell

How to delete files in folder using powershell
Open Powershell
Run Command : Remove-Item –path c:\testfolder\* –recurse

* means any