YUM Configuration fom RHEL 5 Onwards

[root@redhat5 /]# rpm ivh /public/repo/createrepo-0.4.4-2.fc6.noarch.rpm

[root@redhat5 /]# createrepo /public/repo

2179/2179 - libevent-1.1a-3.2.1.i386.rpm                                        m

Saving Primary metadata

Saving file lists metadata

Saving other metadata

[root@redhat5 ~]# vim /etc/yum.repos.d/rhel-debuginfo.repo

[rhel]

name=RHEL5

baseurl=ftp://192.168.1.5

enabled=1

gpgcheck=0

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release

[root@redhat5 ~]# yum install xinetd

Loading "installonlyn" plugin

Loading "rhnplugin" plugin

This system is not registered with RHN.

RHN support will be disabled.

Setting up Install Process

Setting up repositories

rhel                      100% |=========================|  951 B    00:00

Reading repository metadata in from local files

primary.xml.gz            100% |=========================| 751 kB    00:00

################################################## 2178/2178

Parsing package install arguments

Resolving Dependencies

--> Populating transaction set with selected packages. Please wait.

---> Downloading header for xinetd to pack into transaction set.

xinetd-2.3.14-10.el5.i386 100% |=========================| 7.7 kB    00:00

---> Package xinetd.i386 2:2.3.14-10.el5 set to be updated

--> Running transaction check

Dependencies Resolved

=============================================================================

 Package                 Arch       Version          Repository        Size

=============================================================================

Installing:

 xinetd                  i386       2:2.3.14-10.el5  rhel              124 k

Transaction Summary

=============================================================================

Install      1 Package(s)

Update       0 Package(s)

Remove       0 Package(s)

Total download size: 124 k

Is this ok [y/N]: y

Downloading Packages:

(1/1): xinetd-2.3.14-10.e 100% |=========================| 124 kB    00:00

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 37017186

Importing GPG key 0x37017186 "Red Hat, Inc. (release key) "

Is this ok [y/N]: y

Running Transaction Test

Finished Transaction Test

Transaction Test Succeeded

Running Transaction

  Installing: xinetd                       ######################### [1/1]

Installed: xinetd.i386 2:2.3.14-10.el5

Complete!

MANAGING DISK IN LINUX

[root@redhat5 ~]# fdisk -l

Disk /dev/sda: 8589 MB, 8589934592 bytes

255 heads, 63 sectors/track, 1044 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      104391   83  Linux

/dev/sda2              14          78      522112+  82  Linux swap / Solaris

/dev/sda3              79        1044     7759395   83  Linux

Disk /dev/sdb: 5368 MB, 5368709120 bytes

255 heads, 63 sectors/track, 652 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1         652     5237158+  83  Linux

Disk /dev/sdc: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdc doesn't contain a valid partition table

Disk /dev/sdd: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdd doesn't contain a valid partition table

Disk /dev/sde: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sde doesn't contain a valid partition table

Disk /dev/sdf: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdf doesn't contain a valid partition table

[root@redhat5 ~]# fdisk /dev/sdc

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel. Changes will remain in memory only,

until you decide to write them. After that, of course, the previous

content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-130, default 1):

Using default value 1

Last cylinder or +size or +sizeM or +sizeK (1-130, default 130):

Using default value 130

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

 [root@redhat5 ~]# fdisk -l

Disk /dev/sda: 8589 MB, 8589934592 bytes

255 heads, 63 sectors/track, 1044 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      104391   83  Linux

/dev/sda2              14          78      522112+  82  Linux swap / Solaris

/dev/sda3              79        1044     7759395   83  Linux

Disk /dev/sdb: 5368 MB, 5368709120 bytes

255 heads, 63 sectors/track, 652 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1         652     5237158+  83  Linux

Disk /dev/sdc: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sdc1               1         130     1044193+  83  Linux

Disk /dev/sdd: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sdd1               1         130     1044193+  83  Linux

Disk /dev/sde: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sde1               1         130     1044193+  83  Linux

Disk /dev/sdf: 1073 MB, 1073741824 bytes

255 heads, 63 sectors/track, 130 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System

/dev/sdf1               1         130     1044193+  83  Linux

[root@redhat5 ~]# partprobe /dev/sdc

[root@redhat5 ~]# partprobe /dev/sdd

[root@redhat5 ~]# partprobe /dev/sde

[root@redhat5 ~]# partprobe /dev/sdf

Setup Passwordless login through SSH

Server 1 == IP 192.16.0.1    Application

Server 2 == IP 192.16.0.2    Backup

Step 1: Create SSH keys in both servers

Server1: 192.16.0.1:

# cd /root/.ssh

# rm -rf /root/.ssh/*

# ssh-keygen

Server 2: 192.16.0.2:

# cd /root/.ssh

# rm -rf /root/.ssh/*

# ssh-keygen

Step 2: Copy the public keys to other server

Server 1: 192.16.0.1:

# scp /root/.ssh/id_rsa.pub root@192.16.0.2:/root/.ssh/authorized_keys

Server 2: 192.16.0.2: 

# scp /root/.ssh/id_rsa.pub root@192.16.0.1:/root/.ssh/authorized_keys

Step 3: Restart SSH service in both servers

Server 1: 192.16.0.1

# service sshd restart

Server 2: 192.16.0.2

# service sshd restart

Step 4: Now check login without password

Server 1: 192.16.0.1

# ssh 192.16.0.2      => check whether logging in without password

Server 2: 192.16.0.2

# ssh 192.16.0.1      => check whether logging in without password