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Month: September 2015

Install and Configure DHCP Server on CentOS 7 / RHEL 7

September 20, 2015October 27, 2015 4 Comments

DHCP (Dynamic Host Configuration Protocol) is a network protocol used for dynamically assigning IP addresses for computers attached to the network. Standard port used for DHCP service: 67(UDP). In this tutorial we will launch dhcp server on CentOS 7 / […]

Grzegorz Juszczak Linux

How to Manually Extend Cinder Volumes Group in OpenStack

September 14, 2015September 19, 2016 1 Comment

Cinder Volumes group is a block storage based on LVM (Logical Volume Manager) volume group, usually situated in Controller node in OpenStack cloud. It provides persistent block storage for runtime instances. During typical packstack installation Cinder Volumes group size is […]

Grzegorz Juszczak Cloud Computing, Storage

How To Reset Forgotten Root Password on RedHat 7 / CentOS 7

September 13, 2015October 27, 2015 No Comments

RedHat 7 / CentOS 7 unlike previous version 6, doesn’t provide the ability to reset / recover root password in signle-user mode any more. This situation takes place, because RedHat 7 / CentOS 7 uses systemd manager instead of sysVinit […]

Grzegorz Juszczak Linux

How To Reset Forgotten Root Password on RedHat 6 / CentOS 6

September 8, 2015October 27, 2015 No Comments

RedHat 6 / CentOS 6 system gives us the opportunity to reset root password in case we forget it, on condition that we have a direct access to the machine on which we want to reset root password. Password can […]

Grzegorz Juszczak Linux

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