Install Grafana on CentOS/Rhel 7

  1. Download the rpm file


  2.  install initscripts & fontconfig

     yum install initscripts fontconfig urw-fonts

  3.   Install Grafana rpm file

    rpm -ivh grafana-4.6.3-1.x86_64.rpm

  4.  Enable and start Grafana service

    systemctl enable grafana-server.service

    systemctl start grafana-server.service

  5.  After that Grafana can be accessed using the url http://<ipaddress>:3000/. Default username and password is admin / admin.


RHEL 6.5 partition 3TB harddisk using gparted

RHEL 6.5 partition 3TB harddisk using gparted

For my senario,the fdisk -l shows 3TB hdd connected as /dev/sdb

1. So started parted using ,
parted /dev/sdb

2.  create gpt disk label,
mklabel gpt

3. change unit to TB
unit TB

4.  create 3TB partition
mkpart primary 0.00TB 3.00TB

5. fdisk -l , shows that a new partition /dev/sdb1 is created of 3TB in size


5.   To format as EXT4 filesystem,
mkfs.ext4 /dev/sdb1

Docker Installation on Fedora 24

Docker Installation on Linux – Fedora 241.  Update the fedora packages,

        #  dnf update
2.  Create the docker.repo file and add the following entries;

name=Docker Repository

3. Now install the docker-engine
4.  Now enable the docker service and start the docker.
5.  To test docker installation,


Puppet Agent install and configuration on CentOS/Redhat

1. Download the puppet agent from
or go directly to

2. Upload the rpm file to the server and run

rpm -ivh puppet-agent<version>.rpm

Note: Here I am using Centos 6.5 –  64bits OS

3. Configure puppet agent to point to the master server.
3.1   Open the file /etc/puppetlabs/puppet/puppet.conf and add the following entires

certname =
server =
environment = production
runinterval = 1h

3.2 Run puppet agent -t from the client

3.3 Accept the client cert from the Puppet master server

Create LVM on CentOS / RHEL 5.8

How to add 3 new external hdds and create LVM on it.

steps required to configure LVM include:


  • Creating physical volumes from the hard drives.
  • Creating volume groups from the physical volumes.
  • Creating logical volumes from the volume groups and assign the logical volumes mount points
In this case external hdds connected to the server as /dev/sdc, /dev/sdd, /dev/sde
[ The command fdisk -l  will show the hdds connected to the server ]
1. Create a partition on the hdd and change file system to 8e (LVM )
Note:- This is a destructive process, and make sure that any data in the hdd is backed up before proceeding.
  a) fdisk /dev/sdc
  b) enter “n” to create partition,
         enter “1” to create primary partition
         select start and end as default (just press enter at both prompts )
  c) enter “t” to change the file system type and enter ‘8e’ for LVM
  d) enter “w” to save the changes
  e) enter “q” to exit
2)  Create Physical volume


3) Create Volume group from the Physical volumes create

Here I am creating a Volume group  “DB_TEST_EXTERNAL”


4) Create Logical Volume from the Volume group

Here I am creating a Logical Volume named “LV_DATA”

5)  Create filesystem on the share



Find HBA WWPN in RHEL / CentOS 5.x

Find HBA WWPN in RHEL / CentOS 5.X


1) Run the following command to find the manufacturer of the HBA card

[root@host ~]# lspci |grep -i HBA
07:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)
0a:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)

2) To find the WWPN number use the following command and look for port_name

systool -c fc_host -v

[root@host ~]# systool -c fc_host -v |grep “port_name”
port_name           = “0x500XXXXXXXXXXX7e”
port_name           = “0x500XXXXXXXXXXX4a”


[root@host ~]# cat /sys/class/scsi_host/host1/device/fc_host:host1/port_name
[root@host~]# cat /sys/class/scsi_host/host0/device/fc_host:host0/port_name