Table of Contents

1#Backup using mysqldump & zip SFTP client.

export mysqldump

zip www directory & server config files

download to local computer

install new latest version of Softwares LAMP or LEMP

upload

& configuration files & Data

assign users from root to server user.

remote transfer between two linux servers ,rsync

#2 SCP: copying files & directories one sever to another server remote

scp command

secure copy,

scp source user@destinationip: pathtosave

connect remote server by ssh keys

1) If we want to copy a file from a local machine to a remote machine:

syntax:

scp [file_name]  remoteuser@remotehost:/remote/directory

2) If we want to copy a file from remote machine to our local machine.

syntax:

scp user@remotehost:/home/user/file_name .

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

or just delete the html directory in new server

scp -r /var/www/html root@192.168.0.1 /var/www/html

3rd or copying only internal file of html

scp -r /var/www/html/* root@192.168.0.1 /var/www/html

asks for password enter root password.

# 1. Enable roor login in Linxu serer

incase ssh disabled root login. enable root login

in sshd.config file

and

restart sshd.

enable disable password login

nano /etc/ssh/sshd_config

take backup cp

passwordauthentication yes/no

#comment

allow root password login yes/no

#comment

service ssh restart

Incase of Portnumber change

The default port is 22 if nobody changed configuration in the sshd_config file. You may also just append the port number after the host IP address.

2nd way

ssh-copy-id command

ssh-copy-id user@remoteip

enter password.

next time

ssh user@remoteip

no manual copying

for one-time use its better to use ssh password

once the file copied you can disable root login.

to avoid brute force attacks

or pairing ssh keys between two remote severs

public key source machine

private key in target machine

type scp to know manual page(command options)

scp -p22 /,pathtopublickey

#3 Rsync (remote sync data to local & remote to remote)

data between two servers syncs.

set a chrome job to backup daily/weekly.

apt install rsync

syncing data (1st time) to backup directory

rsync datadirectory/* /backupdir

rsync -r /var/www/html/ /etc/home/backup/

-r recursively subfolder & files

-a with users & file permissions attributes .files /hidden files

-av

v verbose output

rsync root@remoteip:- /path/tosave /currentserverpath

File Transfer rsync /scp

Rsync web root Directory

rsync -avz –progress 111.222.333.444:/var/www/site1 /var/www/

Rsync the apache conf

rsync -avz –progress 111.222.333.444:/etc/apache2/* /etc/apache2/

Rsync php config file

rsync -avz –progress 111.222.333.444:/etc/php5/* /etc/php5/

Rsync mysql conf

rsync -avz –progress 111.222.333.444:/etc/mysql/* /etc/mysql/

remote file deleted / source file deleted both will lost.

if new file added both gets new.

ssh root@111.222.333.444 ‘mysqldump -a -u root -ppassword > /root/alldb.sql’

-A dump all databases.

syncing to current server

rsync -avz –progress 111.222.333.444:/root/alldb.sql /root/

import

mysql -u root -ppassword < /root/alldb.sql

rsync is the best Backup solution on server for daily/weekly/monthly routines

#1.1 pairing two servers with ssh key (Optional)

with password

ssh user@remoteip

enter password

you done..

(but every time password entry, vulnerable to others.)

generating ssh keys

note: if you already have public in local desktop,

just copy another remote server, private key already at destination server.

or follow this

generating ssh key

ssh-keygen rsa -a -b 2048

ssh-keygen -t rsa -b 4096
ssh-keygen -t dsa 
ssh-keygen -t ecdsa -b 521
ssh-keygen -t ed25519

root@ubuntu-s-2vcpu-4gb-intel-blr1-01:~# ssh-keygen
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

ls -l /root/.ssh/

cat /root/.ssh/id_rsa.pub

adding public key to the Destination server which one connect

nano ./ssh/authorizedkeys not exost sometims

cd ./ssh

ls -la

copying public key to remote machine

scp (if root password login enabled or download & upload)

scp rsa.pub user@remotep: /pathtolocation

enter password

add public key to

./ssh/authorizedkeys

cat command (appends to end of the file)

file permissions

ssh folder 700

ssh files 600

chmod 700 ./ssh

chmod 600 ./ssh/*

Os kernel version & architecture

uname -r && uname -m

5.2.0-24-virtual

//Kernel version

Os architecture

X86_64 64bit

I686 32

distribution /os version

cat /etc/issue or lsab-release

Ubuntu 12.04.2 LTS \n \l

transfer ssh keys between two servers

transferring core data

/etc/sources/apt/list.deb

file & directories & MySQL dump

preparation

to check which services are running

service –status-all

connecting 2 servers ssh keys

cloning operating system to another disk

(windows desktop we use minitool,)

Migrating users & group

clone running linux server

another way.

cloning is to disk.