The syntax is as follows:

iptables -A INPUT -s IP-ADDRESS -j DROP

e.g.

iptables -A INPUT -s 84.94.83.02 -j DROP

Generate auth keys:

ssh-keygen -t rsa

Copy public key (id_rsa.pub) to destination server:

ssh-copy-id root@10.10.10.10

*Or manually insert key from id_rsa.pub (host) into /root/.ssh/authorized_keys (destination)

Now try shelling from the host machine to the destination e.g.

ssh root@10.10.10.10

You shouldn’t be asked for a password and dropped straight into the server.

Find the drive name:

fdisk -l

*In this example we will use /dev/sdc

Now access parted to prepare the drive for formatting and mounting:

sudo parted /dev/sdc

Now set the following:

(parted) mklabel gpt
(parted) unit TB
(parted) mkpart primary 0.00TB 4.00TB (Changing 4.00TB to the size of your drive)
(parted) quit

apt-get install ntp

Edit ntp config file:

vim /etc/ntp.conf

Update the 4 “server pool.ntp.org” lines to your locale. e.g. UK:

server 0.uk.pool.ntp.org
server 1.uk.pool.ntp.org
server 2.uk.pool.ntp.org
server 3.uk.pool.ntp.org

All zones can be found here http://www.pool.ntp.org/zone/@

Check the date/time is indeed correct:

date

Credit goes to http://wiki.debian.org/DateTime

INSTALL AND CONFIGURE

Install the domain packages:

apt-get install opendkim opendkim-tools

Add the following to /etc/opendkim.conf:

Domain example.com
KeyFile /etc/postfix/dkim.key
Selector dkim
SOCKET inet:8891@localhost

*example.com being your domain

Add the following to /etc/default/opendkim:

SOCKET="inet:8891@localhost"

Add the following to the bottom /etc/postfix/main.cf: