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Devops Cheat Sheet (DRAFT) by

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This is a draft cheat sheet. It is a work in progress and is not finished yet.

Linux

Copy files with directory structure
 
find /home/­use­rsdata/ -type f -user anita -exec cp --parents {} /media \;
Find files by user and count them
 
find /home/­use­rsdata -group anita | wc -l
Show service logs
 
journalctl -u postfi­x.s­ervice
Get list of service
 
systemctl --type­=se­rvice
Change the runlevel 
sudo init 5 Change runlevel
Activate graohical mode 
systemctl set-de­fault graphi­cal.target
Start graohical mode service
 
systemctl start graphi­cal.target
Create user with expery date
 
 sudo useradd -e 2021-12-07 ravi
ssh config
 
sudo vi /etc/s­sh/­ssh­d_c­onfig
Restart a service 
sudo systemctl restart sshd
 

Kubernetes