Linux:

go to root: sudo -s
go to username: sudo -i -u username

tar -czvf name.tar.gz foldername
tar -xvf name.tar.gz

sudo timedatectl set-timezone Europe/Moscow

sudo journalctl -eu fluent-bit.service -f

netcat -ul 9094

date -d@1396713472
Sat Apr 5 19:57:52 MSK 2014

telnet example.com 80
=
curl -v telnet://example.com:80

scp -rp src user@server:dest/

All nginx certs on VM:
ip -c a | grep 192 && sudo grep -r ssl_cert* /etc/nginx/conf.d

Send command to remote terminal:
#!/bin/bash
echo "Enter passwd"
read pass
echo $pass | ssh 192.168.0.1 -t 'sudo -S systemctl status nginx'

----------------------------------------------------------------------------------------------------
Letsencrypt Cert
certbot certonly --manual --manual-auth-hook /etc/letsrncrypt/acme-dns-auth.py --preferred-challenges dns --debug-challenges -d domain_name.ru
dig +short txt _acme-challenge.domain_name.ru @8.8.8.8
----------------------------------------------------------------------------------------------------
disk grow
sudo su -
lsblk

fdisk /dev/vda
parted -l
Fix/Ignore? fix
fdisk /dev/vda
d
default
n
default
default
default
Do you want to remove the signature? [Y]es/[N]o: n
w
The partition table has been altered.
Syncing disks.
xfs_growfs -d /
OR
reboot
====================================================================================================

Docker:

Remove all unused data:
docker system prune -a

====================================================================================================

k8s:

k9s dashboard:
search amd64.rpm https://github.com/derailed/k9s/releases
wget https://github.com/derailed/k9s/releases/download/v0.32.5/k9s_linux_amd64.rpm
sudo dnf localinstall k9s_linux_amd64.rpm

sudo pkill k9s

kubectl:
kubectl cluster-info

====================================================================================================

Other:
For rancher desktop:
Need install WSL: ms-windows-store://pdp/?ProductId=9P9TQF7MRM4R

====================================================================================================

openssl:

ip -c a | grep 192 && sudo ls -lah /etc/nginx/conf.d && sudo grep -r ssl_cert* /etc/nginx/conf.d && sudo ls -lah /var/log/nginx | grep .log
ip -c a | grep 192 && sudo ls -lah /etc/nginx/conf.d && sudo grep -r certificate /etc/nginx/conf.d
ip -c a | grep 192 && sudo grep -r certificate /etc/nginx/conf.d

openssl x509 -noout -text -in  *.crt | grep  'Not After'
openssl x509 -in certname.pem -text | grep Not
openssl x509 -enddate -noout -in certname.pem

CMD version (need installed Git):
Portable:
"C:\Users\USERNAME\Documents\PortableGit\usr\bin\openssl.exe" x509 -noout -text -in  *.crt
Installed:
"C:\Program Files\Git\usr\bin\openssl.exe" x509 -noout -text -in  *.crt

curl --insecure -vvI https://www.google.com 2>&1 | grep "start date:\|expire date:"

Openssl view cert valid time:
cat file location:
cd /etc/nginx/conf.d
ll
cat filename.conf | grep ssl_certificate

=====================================================================================================
Remote grep:

pw=$(cat "PasswdFile")
ip=
link=
echo "server name"
echo $pw | ssh -tt user@ip "openssl x509 -enddate -noout -in certname.pem"


Export keys:

Try:

openssl pkcs12 -in path.p12 -out newfile.crt.pem -clcerts -nokeys
openssl pkcs12 -in path.p12 -out newfile.key.pem -nocerts -nodes

After that you have:
-certificate in newfile.crt.pem
-private key in newfile.key.pem

To put the certificate and key in the same file without a password, use the following, as an empty password will cause the key to not be exported:

openssl pkcs12 -in path.p12 -out newfile.pem -nodes

Or, if you want to provide a password for the private key, omit -nodes and input a password:

openssl pkcs12 -in path.p12 -out newfile.pem

If you need to input the PKCS#12 password directly from the command line (e.g. a script), just add -passin pass:${PASSWORD}:

openssl pkcs12 -in path.p12 -out newfile.crt.pem -clcerts -nokeys -passin 'pass:P@s5w0rD'

====================================================================================================

Ansible:

ansible-vault decrypt /file_location/vars/main.yml
ansible-vault encrypt /file_location/vars/main.yml

eval "$(ssh-agent -s)" && ssh-add /home/administrator/.ssh/id_rsa

ansible-playbook playbooks/playbook-name.yml -bK --check

ansible-playbook playbooks/playbook-name.yml --ask-vault-pass -i inventory_location/inventory.yaml -bK --private-key=/home/administrator/.ssh/id_rsa --user=administrator --check