Difference between revisions of "Cluster der kan alt/Routing NAT and NIS"

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(Created page with "=Routning & NAT= Configuring NAT (Sharing Internet) ==Start Routing== For this, we do not need to install anything new. Everything is right there but is currently disabled. Firs...")
 
(→‎NAT)
 
(18 intermediate revisions by 3 users not shown)
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−
=Routning & NAT=
+
=Routing & NAT=
 
Configuring NAT (Sharing Internet)
 
Configuring NAT (Sharing Internet)
  
 
==Start Routing==
 
==Start Routing==
−
For this, we do not need to install anything new. Everything is right there but is currently disabled. First, edit '''/etc/sysctl.conf'''. Find this:
+
For this, we do not need to install anything new. Everything is right there but is currently disabled.  
 +
 
 +
First, edit sysctl.conf
 +
 
 +
<source lang=cli>
 +
sudo nano /etc/sysctl.conf
 +
</source>
 +
Find this:
 
<source lang=cli>
 
<source lang=cli>
 
net.ipv4.ip_forward=1
 
net.ipv4.ip_forward=1
 
</source>
 
</source>
 
Uncomment it by removing the #. Now forwarding is enabled in the system kernel.
 
Uncomment it by removing the #. Now forwarding is enabled in the system kernel.
 +
 
===Start routing without a reboot===
 
===Start routing without a reboot===
 +
This will enable it without a reboot. Like restart a service
 
<source lang=cli>
 
<source lang=cli>
 
echo 1 > /proc/sys/net/ipv4/ip_forward
 
echo 1 > /proc/sys/net/ipv4/ip_forward
 
</source>
 
</source>
−
This will enable it without a reboot.
 
  
 
==NAT==
 
==NAT==
 +
*Before starting with Nat and switch user to sudo su root
 +
This make a NAT rule for post-routing. It sets the eth0 as the output card (The one out to the internet) and sets source to it's own IP through MASQUERADE
 
<source lang=cli>
 
<source lang=cli>
 
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE  
 
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE  
 
</source>
 
</source>
−
What this does is make a NAT rule for post-routing. It sets the eth0 as the output card (The one out to the internet) and sets source to it's own IP through MASQUERADE. Then write:
+
Save the iptable so it can be loaded correctly after a reboot/shutdown
−
Just to be sure, save it.
 
 
<source lang=cli>
 
<source lang=cli>
 
iptables-save > /etc/iptables.rules
 
iptables-save > /etc/iptables.rules
 
</source>
 
</source>
−
Now that it’s saved we need to load the iptables.rules on starting the network:
+
===Load the iptables.rules at startup===
−
 
+
Edit the file interfaces
−
edit the file '''/etc/network/interfaces'''
+
<source lang=cli>
 +
sudo nano /etc/network/interfaces
 +
</source>
 +
Insert these lines to the eth0 interface
 +
<source lang=cli>
 +
pre-up iptables-restore < /etc/iptables.rules
 +
post-down iptables-restore < /etc/iptables.rules
 +
</source>
 +
Like this
 
<source lang=cli>
 
<source lang=cli>
 
# The extended interfaces
 
# The extended interfaces
Line 34: Line 51:
 
</source>
 
</source>
 
Test it out on your other client.
 
Test it out on your other client.
−
=Installation af master server=
 
  
−
Tilføj følgende linje til '''/etc/hosts.allow'''.
+
=NIS=
 +
 
 +
Enter the hosts.allow file
 +
<source lang=cli>
 +
sudo nano /etc/hosts.allow
 +
</source>
 +
Add the following line
 
<source lang=cli>
 
<source lang=cli>
 
portmap ypserv ypbind: 10.0.0.0/255.255.255.0
 
portmap ypserv ypbind: 10.0.0.0/255.255.255.0
 
</source>  
 
</source>  
−
Installer NIS. Du vil blive bedt om at indtaste domænenavnet. Domænenavnet er ikke DNS-domænenavn - men et unikt navn for klyngen af maskiner deler de samme oplysninger.
+
Install NIS. You will be prompted for domain name. The domain name is not the DNS-domain name - but a unique name for the nodes and master that share the same information.
 +
*NOTE: It is recommended you install NIS using the VMware console instead of SSH
 
<source lang=cli>
 
<source lang=cli>
−
apt-get install portmap nis
+
sudo apt-get install portmap nis
 
</source>  
 
</source>  
−
*Ret '''/etc/default/nis''' (nano /etc/default/nis) og set NISSERVER linjen til
+
Enter the nis file
 +
<source lang=cli>
 +
sudo nano /etc/default/nis
 +
</source>
 +
Set the NISSERVER line to
 +
<source lang=cli>
 +
NISSERVER=master
 +
</source>
 +
Enter the yp.conf file
 
<source lang=cli>
 
<source lang=cli>
−
NISSERVER =master
+
sudo nano /etc/yp.conf
 
</source>
 
</source>
−
*Ret '''/etc/yp.conf''' og tilføj en linje med:
+
Add the line
 
<source lang=cli>
 
<source lang=cli>
 
domain dka.local server 127.0.0.1
 
domain dka.local server 127.0.0.1
 
</source>
 
</source>
−
*Ret '''/etc/ypserv.securenets''' fjern '''0.0.0.0''' linjen - insecure - og tilføj dit eget net(255.255.255.0 10.0.0.0).
+
Enter the ypserv.securenets file
−
*genstart så yellowpages servicen for at loade det nye configuration.
+
<source lang=cli>
 +
nano /etc/ypserv.securenets
 +
</source>
 +
Replace the 0.0.0.0 line with the 255.255.255.0         10.0.0.0
 +
<source lang=cli>
 +
0.0.0.0        0.0.0.0
 +
 
 +
255.255.255.0        10.0.0.0
 +
</source>
 +
Reboot the Yellowpages service so the new configuration can be loaded
 
<source lang=cli>
 
<source lang=cli>
 
service ypserv restart
 
service ypserv restart
Line 78: Line 118:
 
<source lang=cli>
 
<source lang=cli>
 
#!/bin/bash
 
#!/bin/bash
−
echo -e "Adding user to cluster"
+
echo -e "Adding user to cluster\n"
−
echo -e "======================\n"
 
 
echo -en "User login name: "
 
echo -en "User login name: "
 
read NAME
 
read NAME
Line 87: Line 126:
 
su $NAME -c "ssh-keygen"
 
su $NAME -c "ssh-keygen"
 
echo -e "Distributing keys"
 
echo -e "Distributing keys"
−
su $NAME -c "cat /home/$NAME/.ssh/id_rsa.pub >> /home/$NAME/.ssh/authorized_keys"
+
su $NAME -c "cat /home/$NAME/.ssh/id_rsa.pub >> /home/$NAME/.ssh/authorized_key$
 
echo -e "Rebuild NIS database"
 
echo -e "Rebuild NIS database"
 
make -C /var/yp
 
make -C /var/yp
 
</source>
 
</source>
  
−
=Installation på klienten=
 
−
Installer software
 
−
<source lang=cli>
 
−
sudo apt-get install portmap nis
 
−
</source>
 
−
Kør disse kommandoer, hvor NIS_SERVER_IP = din nis server ip
 
−
<source lang=cli>
 
−
echo "portmap : <notice>NIS_SERVER_IP"</notice> >> /etc/hosts.allow
 
−
echo "+::::::" >> /etc/passwd
 
−
echo "+:::" >> /etc/group
 
−
echo "+::::::::" >> /etc/shadow
 
−
echo "Domain = Cluster" >> /etc/idmapd.conf
 
−
echo "ypserver <notice>NIS_SERVER_IP"</notice> >> /etc/yp.conf
 
−
service ypbind restart
 
−
service idmapd restart
 
−
</source>
 
−
Test med
 
−
<source lang=cli>
 
−
yptest
 
−
</source>
 
 
{{source cli}}
 
{{source cli}}

Latest revision as of 11:04, 30 October 2014

Routing & NAT

Configuring NAT (Sharing Internet)

Start Routing

For this, we do not need to install anything new. Everything is right there but is currently disabled.

First, edit sysctl.conf 

sudo nano /etc/sysctl.conf

Find this: 

net.ipv4.ip_forward=1

Uncomment it by removing the #. Now forwarding is enabled in the system kernel.

Start routing without a reboot

This will enable it without a reboot. Like restart a service 

echo 1 > /proc/sys/net/ipv4/ip_forward

NAT

  • Before starting with Nat and switch user to sudo su root

This make a NAT rule for post-routing. It sets the eth0 as the output card (The one out to the internet) and sets source to it's own IP through MASQUERADE 

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

Save the iptable so it can be loaded correctly after a reboot/shutdown 

iptables-save > /etc/iptables.rules

Load the iptables.rules at startup

Edit the file interfaces 

sudo nano /etc/network/interfaces

Insert these lines to the eth0 interface 

pre-up iptables-restore < /etc/iptables.rules
post-down iptables-restore < /etc/iptables.rules

Like this 

# The extended interfaces
auto eth0
iface eth0 inet dhcp
pre-up iptables-restore < /etc/iptables.rules
post-down iptables-restore < /etc/iptables.rules

Test it out on your other client.

NIS

Enter the hosts.allow file 

sudo nano /etc/hosts.allow

Add the following line 

portmap ypserv ypbind: 10.0.0.0/255.255.255.0

Install NIS. You will be prompted for domain name. The domain name is not the DNS-domain name - but a unique name for the nodes and master that share the same information.

  • NOTE: It is recommended you install NIS using the VMware console instead of SSH
sudo apt-get install portmap nis

Enter the nis file 

sudo nano /etc/default/nis

Set the NISSERVER line to 

NISSERVER=master

Enter the yp.conf file 

sudo nano /etc/yp.conf

Add the line 

domain dka.local server 127.0.0.1

Enter the ypserv.securenets file 

nano /etc/ypserv.securenets

Replace the 0.0.0.0 line with the 255.255.255.0 10.0.0.0 

0.0.0.0         0.0.0.0

255.255.255.0         10.0.0.0

Reboot the Yellowpages service so the new configuration can be loaded 

service ypserv restart

Adding a user

Efter du har oprettet en ny bruger, adduser er det nødvendigt at genopbygge nis maps! 

root@head:~# <input>make -C /var/yp</input>
make: Går til katalog '/var/yp'
make[1]: Går til katalog '/var/yp/c1.local'
Updating passwd.byname...
Updating passwd.byuid...
Updating netid.byname...
Updating shadow.byname...
make[1]: Forlader katalog '/var/yp/c1.local'
make: Forlader katalog '/var/yp'

Script adding user in a Cluster

The following simple script:

  • Add a user on the NIS server.
  • Add a ssh key to the users /home library.
    • In this cluster /home is distributed with NFS to all nodes. Logon to nodes without entering password
  • Rebuilding the NIS database with the new user
#!/bin/bash
echo -e "Adding user to cluster\n"
echo -en "User login name: "
read NAME
adduser $NAME

echo -e "Creating keys"
su $NAME -c "ssh-keygen"
echo -e "Distributing keys"
su $NAME -c "cat /home/$NAME/.ssh/id_rsa.pub >> /home/$NAME/.ssh/authorized_key$
echo -e "Rebuild NIS database"
make -C /var/yp


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