How to manage rc script using chkconfig?

39.How to manage rc script using chkconfig?
Ans.
1. Fedora core and Red hat enterprise Linux come with a useful tool called ‘chkconfig’.

2. It helps the system administrator to manage rc script and xinetd configuration files without having to manipulate them directly.

3. Type ‘chkconfig –list’ to see all the services chkconfig knows about, and whether they are started or stopped on each runlevel.

4. Example:
atd 0:off 1:off 2:off 3:on 4:on 5:on 6:off
The first column is a name of the installed service, the next 7 columns represents a runlevel and tell us whether that service is turned on or off in that runlevel.

5. To turn a service on or off using chkconfig, we use following syntax:
Chkconfig –level[0-6] (you must choose a runlevel) servicename off|on|reset

6. To turn off the gpm daemon turned on previously, type:
chkconfig –level 2 gpm off

7. To turn on xinetd type:
chkconfig xined on

8. Run chkconfig –list again to check the changed services are set to the state we desire.

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Explain process of setting up a NIC (Network interface card).

44.Explain process of setting up a NIC (Network interface card). Ans. 1. Network interface card (NIC) can be set-up by configuring the network card and internal network. 2. Before configuring network card we must check loopback (IP address 127.0.0.1) is working. 3. Even if the compute is not connected to outside network internet network configuration is required for some applications. This address is known as loopback device, and its IP address is 127.0.0.1 4. To check loopback device is configured or not, we use ‘ifconfig’ command it shows a device called ‘lo’ with the address 127.0.0.1, if this device and address is not shown there then loopback is not configured. 5. To configure it we can use command ifconfig lo 127.0.0.1 after that we need to use the ‘route’ command to give system a little more information about this interface for this ‘route add –net 127.0.0.0’ command is used, after this loopback is setup. 6. To configure a network card we will use ifconfig co...

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List and explain all NFS server commands.

65.List and explain all NFS server commands. Ans. 1. exportfs: a) The exportfs command enables user to manipulate the list of current exports without editing /etc/exports. b) It also maintains the list of currently exported file system in /var/lib/nfs/etab. Example: The exportfs –a command initializes /var/lib/nfs/etab, synchronizes it with the contents of /etc/exports. c) To add a new export to etab and also /etc/exports the syntax is : #exportfs –o opts hostdir d) Example: #exportfs –o sync,rw 192.168.166.7:/demo The above command exports the directory /demo to client 192.168.166.7 with export option rw and sync. e) –v option of this command, lists currently exported filesystem. Example: #exportfs –v f) –u options unexports the filesystem as follow: Example: #exportfs –u 192.168.166.7:/demo 2. showmount: a) The showmount command provides information about clients and the file systems they have mounted. b) Syntax is : #showmount [-advhe] [host] ...

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