Install Openfiler

Scenario: Installing Openfiler at sda 40GB size.

System: Openfiler ESA 2.99.1

Steps:
– Download Openfiler iso from here.
– Booting from Openfiler iso/DVD.
– Select Graphical Mode press Enter.
– Click Next.
– Select Keyboard -> Click Next then select Yes to initialize drive,erasing ALL DATA.
– Continue click Next if using default Openfiler partition table. I setup LVM for /var and swap for easy increase the space in the future.
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Setup Autologout on CentOS/RHEL

Scenario: How to setup autologout console and ssh session on CentOS/RHEL
System: CentOS/RHEL 6/7

By default on CentOS/RHEL fresh install system didn’t come with automatically logout, you must manually configure Linux system to automatically log users out after a period of inactivity.

Steps to set up system wide auto logout console and ssh session
1) Log in as root.
2) Create a new script file (to auto logout after 15 minutes),example we create autologout.sh.
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Install Ansible Core on CentOS 7

System: CentOS 7, Ansible-2.6.0

Step 1 — Installing Ansible
To begin exploring Ansible as a means of managing our various servers, we need to install the Ansible software on at least one machine.

To get Ansible for CentOS 7, first ensure that the CentOS 7 EPEL repository is installed:
# yum install epel-release

Install Ansible
# yum install ansible
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Create Partition on New Disk using Parted on CentOS


Scenario: Create partition and Volume Group 60GB size from 100GB disk on new disk using Parted on CentOS
System: CentOS/RHEL 6 or 7

Steps:
Show new disk:
# fdisk -l | grep sd

[root@server ~]# fdisk -l | grep sd
Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectors
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200    81797119    39848960   8e  Linux LVM
Disk /dev/sdb: 107.4 GB, 107374182400 bytes, 209715200 sectors
[root@server ~]#

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Mount Windows Folder Sharing on RHEL 6/CentOS 6

Scenario:
-Mount Windows Folder Sharing (CIFS) on RHEL 6/CentOS 6.
-Set only Linux user >> user1 that have RWX access.
-Hide sharing credentials from other Linux users.
-Mount permanent at boot.

System: CentOS 6

Steps:
1) Edit /etc/fstab
# vi /etc/fstab
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Setup Virtual Domain Postfix

Scenario:
– Forward certain email recipient to another email address.
– Forward local Unix account email address to another email recipient because in the Postfix server don’t have mailbox.

System:
Postfix on CentOS 7/RHEL 7 (also work on CentOS 6/RHEL 6)

Steps:
– Edit main.cf
# vi /etc/postfix/main.cf
Edit the below parameter.

virtual_alias_domains = example1.com,example2.com
virtual_alias_maps = hash:/etc/postfix/virtual

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Configure Display Date and Time in Bash History Command on CentOS/RHEL

Scenario: How to display date and time in bash history command on CentOS/RHEL.

By default default history command output didn’t show date and time.

[bachem@centos7ht ~]$ history
    1  sudo su
    2  su -
    3  sudo su
    4  su -
    5  ulimit -a

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