Configuretion Redhat

How To Configure Yum Server In REDHAT6

1. YellowDog Updater Modified (YUM)

2. Mount the rhel-6 dvd
          mount /dev/cdrom /mnt

GOTO
3. cd /mnt/Packages

NOW INSTALL
                        4. rpm -ivh vsftpd[TAB CLICK]

                        5. service vsftpd start

                        6. chkconfig vsftpd on
                        7. mkdir /var/ftp/pub/rhelrepo

                        8. cp -av /mnt/Packages/* /var/ftp/pub/rhelrepo

                        9. cp /mnt/repodata/*comps*.xml                  /var/ftp/pub/rhelrepo/comps.xml[optional] [ Need to create group repository]

                       GOTO
10. cd /var/ftp/pub/rhelrepo

11. rpm -ivh deltarpm [TAB CLICK]

12. rpm -ivh python-deltarpm [TAB CLICK]

13. rpm -ivh createrepo [TAB CLICK]

14. createrepo -g /var/ftp/pub/rhelrepo/comps.xml /var/ftp/pub/rhelrepo

CREATE A FILE
15. vim /etc/yum.repos.d/server.repo

           [server]
          name=server repo
          baseurl=file:///var/ftp/pub/rhelrepo/
          gpgcheck=0
          enabled=1
          :wq

NOW  MAKE SURE
16. yum clean all [if you have local.repo then delete it first]
17. yum makecache
18. To check if the server is up and functioning
          yum info squid
          yum groupinfo "KDE Desktop"
19. chcon -R -t public_content_t /var/ftp/pub/rhelrepo
20. service vsftpd restart
                                                Client Configuration
                                               
1. mount /dev/cdrom /mnt
2. cd /mnt/Packages/
3. rpm -ivh ftp[TAB]
4. vim /etc/yum.repos.d/yum.repo
          [server]
          name=server repo
          baseurl=ftp://192.168.122.43/pub/rhelrepo/ [assuming that the server ip is                                                                                     192.168.122.43]
          gpgcheck00
          enabled=1
          :wq
5. yum clean all [if you have local.repo then delete it first]
6. yum makecache
                                               

                                                     Troubleshooting
                                                ===============
7. If you see any error saying "couldn't connect to host"
 then enable port 21 in the yum server

          iptables -I INPUT -p tcp --dport 21 -j ACCEPTservice
          service iptables save
          service iptables restart

8. You should also enable the port 20
          iptables -I INPUT -p tcp --dport 20 -j ACCEPT

9. If you can login successfully with the anonymous user but cannot list (ls command) the ftp or pub directory and "no route to host or entering passive mode is displayed" then
          #### remove the 2 lines from /etc/sysconfig/iptables

          -A FORWARD -j REJECT --reject-with icmp-host-prohibited

                                                                                                           REDHAT6 -USE THIS COMMAND TO MAKE A YUM SERVER

IF YOU HAVE ANY QUESTION PLZ CONTACT US

AUTOMOUNT
=========
Package name: autofs

What is Autofs---Autofs is a client-side service that automatically mounts the appropriate file system. The components that work together to accomplish automatic mounting are the following thats not parmanent mount when need its auto mount automatic

1. Sometimes you might want to mount a share (nfs or smb) permanently.
You can do it by adding the share details in the fstab file.
The problem is, if the target computer is not running then your computer would freeze at boot time. The reason is, your computer will try to mount all the filesystems mentioned in the fstab. Since the target computer is not running, your computer would fail to mount the nfs or smb share.

2. To avoid this situation, we configure automount to mount the shares.
3. Two files are needed to configure automount
i. auto.master
ii. auto.misc
both files reside in the /etc directory

4. Let's assume we have a share on a server named server-1
The servers ip is 192.168.1.1
The share path is /share1

5. We have a client machine named client-1
The clients ip is 192.168.1.2
We will mount the share in the /ok directory

6. We need to permanently mount the /share1 on client-1
7. First open the auto.master file
vim /etc/auto.master
/ok /etc/auto.misc
:wq

8. vim /etc/auto.misc
share1 -fstype=nfs 192.168.1.1:/share1
:wq

9. service autofs restart

10. ls /ok/share1

11. you should see the shared files.

Samba Just Magic
what is SAMBA
As the front page at samba.org says, "Samba is an Open Source/Free Software suite that provides seamless file and print services toSMB/CIFS clients." Samba is freely available, unlike other SMB/CIFS implementations, and allows for interoperability between Linux/Unixservers and Windows-based clients.
=====

Section-1:
Configuring smb client:
1. You don't need to configure any client to use smb.
2. smb-client package is installed by default.
3. To view the shares of a machine type
smbclient -L ip-or-hostname -U username
Example: smbclient -L 192.168.100.254 -U student
4. To mount a samba share
mount.cifs //target/sharename /mounting_directory -o user=username
Example: mount.cifs //192.168.100.254/share /mountsmb -o user=student
[assuming that the target server is 192.168.100.254, the sharename is share, the mounting directory is /mountsmb and the user is student]
enter the password for the user student
ls /mountsmb
you should see the contents of the share in the /mountsmb directory.

Section-2: SAMBA Server
Configuring samba share:
1. Package name = samba4
2. yum install samba4*
if you get any error
yum erase samba*
then again yum install samba4*
[ if you cannot erase samba then type yum install samba-*]
3. Configure firewall to allow smb traffic
iptables -I INPUT -p tcp --dport 137 -j ACCEPT
iptables -I INPUT -p udp --dport 137 -j ACCEPT
iptables -I INPUT -p tcp --dport 138 -j ACCEPT
iptables -I INPUT -p udp --dport 138 -j ACCEPT
iptables -I INPUT -p tcp --dport 445 -j ACCEPT
iptables -I INPUT -p udp --dport 445 -j ACCEPT
iptables -I INPUT -p tcp --dport 139 -j ACCEPT
iptables -I INPUT -p udp --dport 139 -j ACCEPT
4. service iptables save
5. service iptables restart
6. create directories which you want to share or use existing directory
here we are creating a directory
mkdir /newshare
cd /newshare
touch file1 file2 file3
7. create a user to access smb share or use existing user
here we are creating a new user
useradd smbuser
passwd smbuser
smbpasswd -a smbuser [ if you use existing user then only this command would be enough]
8. vim /etc/samba/smb.conf
#find the line starts with "workgroup=mygroup"
change the mygroup to WORKGROUP
#fine the line starts with "host allow="
remove the semicolon (;) and modify the line to add the networks you want to give access to
#Now go to the last line of the file and insert a new line
[sharename]
comment = any comment
path = /path-of-the-share-directory
browseable = yes
writable = yes
printable = yes
valid users = username
### and many more options which you have to learn on you own interest###
9. For every share you have to cofigure this file again and again
10. service smb start
11. chkconfig smb on
12. service nmb start
13. chkconfig nmb on
14. service winbind start
15. chkconfig winbind on
16. To check the share
smbclient -L ip -U username
type the password of the user and you should see the shares.
17. Now go to another machine and follow section-1

                                      about LVM

lvm configuration------------------



                                                   create lvm---


1. Let's assume we have three new hard drives /dev/sda, /dev/sdb, /dev/sdc
2. First we need to create the physical volumes
pvcreate /dev/sda /dev/sdb [ /dev/sdc is left to extend the physical volume later]
pvdisplay
3. Now we need to create the logical volume group
vgcreate name-of-the-group /dev/sda /dev/sdb
Example: vgcreate vg1 /dev/sda /dev/sdb
vgdisplay
4. lvcreate -n lv1 -L 1G vg1
lvdisplay
5. mkfs.ext4 /dev/vg1/lv1
6. mkdir /lvolume1 [to mount the logical volume lv1 create a directory]
7. vim /etc/fstab
/dev/vg1/lv1 /lvolume1 ext4 defaults 0 0
or /dev/mapper/vg1-lv1 /lvolume1 ext4 defaults 0 0
8. mount -a
9. reboot

Extend LVM
==========

Situations of extending LVM

a. The logical volume is out of space => Extend the logical volume.
b. The logical volume and the volume group both are out of space => Extend the volume group by adding new physical volume.


1. To extend volume group
i. Add a new hard drive or create a new partition
ii. pvcreate /dev/sdc [ assuming your new drive is sdc]
iii. pvscan or pvdisplay [ optional]
iv. vgextend volume-group-name /dev/sdc
Example: vgextend vg1 /dev/sdc [ assuming your volume group is vg1 and partition is sdc]
v. vgscan
2. To extend logical volume [ umount /lvolume1  (assuming that you have mounted the logical volume at /lvolume1)]
i. lvextend -L +1G /dev/vg1/lv1
ii. resize2fs -p /dev/vg1/lv1
iii. mount -a




                           https://www.youtube.com/watch?v=1StGzqQcEEo