Everything is Linux

Wednesday, November 7, 2012

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!

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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

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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

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