redhat 18 samba nis ssh

8/2/2019 REDHAT 18 Samba Nis Ssh

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CONFIDENTIALDocument Name

Andrew Tridgell wrote a SMB [server message block] client and server that he calledSamba.

Samba is a collection of Linux tools that allow you to communicate with windowssystems over a network.

Helps in browsing the network resources using host names by name resolutioninstead of DNS.

File and printer sharing is probably the most attractive samba feature.

Samba configuration


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Packages : samba, samba-common, samba-client

Daemons : smbd, nmbd (NetBIOS nameserver)

Config file : /etc/samba/smb.conf

Ports : 137 (nmbd), 138(smbd)

Samba Service Profile


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Samba configuration

rpm -q queries

for the packages

installed.


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Samba configuration

rpm -ivh along with

package name installs

the package.


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/etc/samba/smb.conf is the

configuration file.

Samba configuration


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The smb.conf file is

opened now to edit.

Samba configuration

The windows domain

name or the workgroup

name can be given.


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This is the default screen

showing the default network

for accessing.

Samba configuration



The screen shows that the network

192.168.0 and 192.168.1 can access

the samba server.

Samba configuration



At the end of the smb.conf file,

shows the example of how to share

the linux files.

Samba configuration



The previous example is used here

as such like tmp and var directory.

Samba configuration

The tmp directory is shared to

public(full access) as well as write

the file.

The var directory is given as theuser joe only can access the file

from any windows operating

system.



Password is set for accessing from

the windows operating system.

Samba configuration

Samba user name and password

are stored in/etc/samba/smbpasswd file.



The service for the samba

configuration is started by

restarting.

Samba configuration



smbclient -L shows the shared

directory of samba server.

Samba configuration


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This command helps to

confirm whether the

configuration is done properly.

Samba configuration

The user joe gets logged in by

giving password for

authentication. ls command is

used to list the files shared.


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The screen viewing the listed files.

mget command copy the file from

shared directory to our machine.

Samba configuration


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testparm command is used

to show the shared

directory of the samba

server.

Samba configuration

Hitting enter will show the

detailed shared directory.


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Here the screen shows the

simulation of the samba

configuration.

Samba configuration


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NIS

- Network information service.

- NIS stores administrative files in /etc/passwd, /etc/hosts etc., in DB

files.

- These Datas are available over the network to all clients that are

connected to the NIS domain.

- NIS client daemon (ypbind) finds a server for its

NIS Domain by sending a broadcast request.


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Packages : ypserv, ypbind, yp-tools

Daemons : ypserv, ypbind, rpc.yppasswdd

Config. Files : /etc/ypserv.conf (server)

/var/yp/*,

/etc/sysconfig/network (common)

/etc/nsswitch.conf, (client)

/etc/yp.conf

Port : 111 (assigned byportmap)

NIS: Service profile


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Define the NIS domain name that the NIS server will work for.

Start the ypserv daemon.

In the /var/yp/Makefile file, set any NIS server options and specify the configuration

files to manage.

Use ypinit to create the NIS versions of the configuration file.

Steps to Configure NIS


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NIS Configurations

Query is made to check

whether the portmap and

ypserv are installed. if not,

install the packages


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To set the nis domain name

temporarily, nisdomainname

command is used.

NIS Configurations

To set nis domain name

permanently, entries are made at

/etc/sysconfig/network.


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Enter the nis domain

name.Here our nis domain

is nis

NIS Configurations


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Start the portmap and

ypserv services.

NIS Configurations


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Open the nis

configuration file.

NIS Configurations


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nopush options is set to true if

there is no nis slave server.andit is set to false if there is a

slave sever.

NIS Configurations


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The minimum user and

group Ids are set to 500.

NIS Configurations

MERGE_PASSWD is to true than

the password file and the shadow

file will be merge.

MERGE_GROUP is set

to true than the group

file and the gshadow file

will be merge.


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The files that are shared on thenetwork are listed in the all.

NIS Configurations


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This command

create the nis

database consistingof the nis

configuration file.

NIS Configurations


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Create a control access file

named securents, which

enables access by hosts to

the nis server.

NIS Configurations

Open thecontrol access

file.


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Here we are giving access all the

hosts in the network 192.168.0.0

and the localhost.

NIS Configurations


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Restart the yppasswdd andypserv services.

NIS Configurations


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In client side check for the

ypbind package.

NIS Configurations

This command is

used to indicate the

nis server.


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Select the NIS option and enter the

nis domain name and its ip address

and press next.

NIS Configurations


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Press ok tocontinue.

NIS Configurations


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ypcat lists any NIS configurationfile here we can see the password

file.

NIS Configurations


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ypmatch command is used to view

a particular users entry in the

configuration file.

NIS Configurations

Open the

auto.master file.


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Open theauto.misc file.

NIS Configurations


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Mention the NIS server ip address

and the home directory to bemounted.

NIS Configurations


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Restart the autofs

service .

NIS Configurations

S h ll (SSH)


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Secure shell (SSH)

Secure Shell

Allows remote logins and remote command execution via secure encryptedconnections.

Syntax:

ssh @

S h ll (SSH)


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Secure shell (SSH)

Service for the sshd is

restarted.

S h ll (SSH)


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Secure shell (SSH)

Open the file

hosts.allow.


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Sec re shell (SSH)


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Secure shell (SSH)

Open the hosts.deny

file.

Secure shell (SSH)


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Secure shell (SSH)

sshd : ALL entered above means

that except example .com others

are restricted to access.

Secure shell (SSH)


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Secure shell (SSH)

Look at the client machine it is

available in the example.com domain.

Secure shell (SSH)


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Secure shell (SSH)

From the host satation41 we

logged as root in

station20.example.com

O h


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Open SSH replaces common, insecure network communication skills.

Provides greater data security between networked systems.

Capable of tunneling in secured protocols through forwarding.

Open ssh

Open ssh


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Open ssh

Packages : openssh-clients, openssh-server

Daemons : sshd

Config. Files : /etc/ssh/*, $home/.ssh

Port : 22

Open ssh


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Open ssh

The openssh packages are installed

Open ssh


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Service sshd is

restarted.

Open ssh

Open ssh


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Keygen is used to generate

public and private keys

using DSA algorithm.

Open ssh

The generated private key is saved

in id_dsa file.

The generated public key is saved

in id_dsa.pub file.

Open ssh


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To transfer the public key to aremote machine

use scp command .

Open ssh

Open ssh


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Create a file named authorized_keys in

/root/.ssh directory and give full

permission to the owner for .ssh

directory .

Open ssh

Redirect the public key file

id_dsa.pub to the authorized_keysfile.

Open ssh


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Give read and write permission to

owner for the file authorized file.

Open ssh

Open ssh


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Now we can access the machine

192.168.0.21 remotely withoutknowing passwd using public key.

Open ssh


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Thank You!

redhat 18 samba nis ssh

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