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Deepak Prasad
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How to configure and Install kdump (crashkernel) in RHEL/CentOS 7
Below list of topics are covered in this article What is kdump? Memory requirements Installing kdump Adding Boot Parameters Where to find generated vmcores? Configuring the core collector Enabling the service Testing the kdump configuration Analysing hung t...
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Step by step guide to implement/modify quota (soft and hard limit) for user, add/modify grace period and more in Linux with examples
The setquota command sets and changes the quota limits for a user, a group, or a file set.. Quota Implementation is done in Linux to limit the storage consumption per user/group. Features: Limit storage consumption per user/group Based on disk block usage o...
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How to fix "NoValidHost: No valid host was found. There are not enough hosts available" during overcloud deployment (openstack)
ERROR: You get below error message on the console while performing an overcloud deployment from the undercloud director 2018-08-14 06:42:59Z [overcloud.Controller.0.Controller]: CREATE_FAILEDĀ  ResourceInError: resources.Controller: Went to status ERROR due ...
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Final Part 3: Openstack TripleO Architecture and Step By Step Guide for installation of undercloud and overcloud nodes (compute, controller, ceph-storage)
Below list of topics are covered in this article Bring up undercloud director Prepare Undercloud for overcloud deployment Phases of overcloud node deployment Registering an overcloud node Configure Virtual Bare Metal Controller (VBMC) Configuration Files Re...
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Part 2: Openstack TripleO Architecture and Step By Step Guide for installation of undercloud and overcloud nodes (compute, controller, ceph-storage)
Below list of topics are covered in this article Part 1: Bringup Undercloud setup Verifying undercloud Installation Os-net-config Creating Directories for Templates and Images Install director images Upload overcloud images Setting a Nameserver on the Under...
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Part 1: Openstack TripleO Architecture and Step By Step Guide for installation of undercloud and overcloud nodes (compute, controller, ceph-storage)
In the article we will cover below topics Undercloud Overcloud TripleO architecture Undercloud Director Virtual Machine Validate FQDN of the undercloud director Register your undercloud node Installing the Director Packages Creating user for undercloud depl...
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How to check memory usage of an individual process or application/program in Linux
We know there are various tools available which can help you get the memory related information from the system, some of them are listed below Report short summary of memory utilization statistics. # free Report details of memory utilization statistics. # c...
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How to enable or disable transparent (THP) and explicit (nr_hugepages) hugepage and check the status in Linux with examples (explained in detail)
Follow below link to my last article to understand about transparent huge page in detail What is transparent hugepage (THP) and how to check THP usage per process in Linux (Explained) There can be two types of HugePages in the system Explicit Huge Pages whi...
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What is transparent hugepage (THP) and how to check THP usage per process in Linux (Explained)
Hugepages is a feature that allows the Linux kernel to utilise the multiple page size capabilities of modern hardware architectures. Memory is managed in blocks known as pages. A page is 4096 bytes. 1MB of memory is equal to 256 pages; 1GB of memory is equa...
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How to lock or unlock a root and normal user account using pam_tally2 and pam_faillock after certain number of failed login attempts in Linux
To secure your server against unwanted attempts to login from third party it is always a good idea to implement login related hardening so that a user is denied login after certain amount of failed login attempts. In my last article I had shared steps to ch...
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