connect to server by SSH client Putty SFTP client winscp LAMP, LEMP nginx apache etc linux

#1 Download SSH client Putty & Putty gen

puttygen optional to generate keys in local machine.

1.2 Obtain IP Address  & root Password of the server

if not, you can add ssh Key by their dashboard like google cloud, Digital ocean etc.

or you can directly login without any credentials from hosting provider dashboard with their building ssh client.

SSH connection through putty using root & password

enter your ip address and select port as 22, (21 for fTp).

Once its asks name enter root (any username if it is has root privileges)

then asks you enter the password.

once you login to

yournamme@machine# will appears

but you need to learn linux commands here

Generating SSH keys & pairing between remote machine

#1. Generating SSH keys on remote server

ssh-keygen -t rsa

or you can add encryption strength 1024, 2048, 4096 etc

root@instance-1:~# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:TooN6YdwYieraczFb+uL0wYxuEgcXsNPpuQK4OPxM9U root@instance-1
The key's randomart image is:
+---[RSA 2048]----+
|  .              |
|.. = o           |
|= * * .          |
|.O = + E         |
|= % O   S        |
|.= / = +         |
|o o X + .        |
| * ..*           |
|+  .=+o          |
+----[SHA256]-----+

#2 Connecting to Remote server & copying public key

Note: public key at Target machine (server)

Private key at source machine (local)

a. connection

ssh user@remoteip

ssh root@192.168.0.1

if ssh key it will ask you to yes or no

it asks root password , once you enter the root password.

it will allow to communicate.

after connection use SCP command

scp /var/www/bak.zip root@192.168.0.1: /var/www/

scp /var/www/html/srt.sql root@192.168.0.1:/var/www/html

Copying Public key to Authorized_keys .

we use cat command to append at end of the file or you can manually edit using nano.

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

Beware: you must file path.

Then You may follow syncing & copying between 2 servers.

SSH Folder & keys file permission

File permissions should be

750 for folder &

640 for files.

How to use ssh-keygen to generate a new SSH key

1. download puttygen
2. click on generate keys
3. just drag by mouse it will generate public & priate keys.

Copy the Prite keys to root/.ssh/authrized_keys

Manual through sftp client winscp

command line by nano command.

Restart SSHD if needed

sudo systemctl restart sshd.service

Enable / disable root password login in SSH

nano /etc/ssh/sshd_config

allow root password login = yes

comment or uncomment change no or year depending on your need.

its better to turn off root password to avoid attacks.

sudo service sshd reload

Download winscp SFtp as for file Transfers

we can do file transfer by SCP  & CP command . But the winscp gies a look of file manager just like cpanel.

1. Download & install winscp.
2. Open winscp and click add new site.
3. Enter Ip address & Port
4. Enter Username
5. Password leave it blank if you already added Public key at server .
6. click on Advanced and advanced>>SSH>> authenticate key browse for the private key and Save.
7. or if you not yet added the public to the serer.
8. by hosting provider dashboard ft gce,digital ocean etc
9. login with root & password add key check connection then disable password
10. Hosting provider default ssh client

Copy the Private key from server or generate private key pair form puttygen.

putty integration with winscp

download and install putty , then winscp automatically uses for command line interface.

winscp+putty (must).

other popular SFTP & FTP clients for windows

Filezilla etc

Creating SSH Keys for non root users

user able to login to /home/user/

after user login

generate key

the ssh directory basically already created in user directory.

.ssh

/home/user/.ssh/keys

root@instance-1:/home# cd ubuntu

root@instance-1:/home/ubuntu# ls -a
.  ..  .bash_logout  .bashrc  .profile  .ssh

root@instance-1:/home/ubuntu# cd .ssh
root@instance-1:/home/ubuntu/.ssh# ls -a
.  ..  authorized_keys
root@instance-1:/home/ubuntu/.ssh#

linux users & group management

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Troubleshooting

Incorrect public & private keys for User

Reasons: File Permissions  assign  directory & files  with Correct permissions.