How to rebuild hawkular metrics after cluster deploy on OpenShift 3.11

Rebuild hawkular metrics after cluster deploy on OpenShift 3.11.

How to install OpenShift client 3.11

Install OpenShift client 3.11.

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How to calculate real disk capacity

Use basic linux command-line utility to calculate real disk capacity.

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SysOps

How to determine available authentication methods

Determine available authentication methods on the specified OpenSSH server.

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How to display details for specific OpenSSL cipher

Display details for specific OpenSSL cipher, only single one.

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How to undo fsck operations performed on the Ext4 filesystem

Undo undo fsck operations performed on the Ext4 filesystem.

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How to reindex directories located in the Ext4 filesystem

Reindex directories located in the Ext4 filesystem after removing a huge number of files to optimize directory sizes.

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SysOps

How to inspect OpenSSH client configuration

Inspect OpenSSH client configuration to search and display configured hosts.

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How to expand an existing XFS filesystem on LVM Logical Volume

Expand an existing XFS filesystem on LVM Logical Volume.

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How to revoke specific key used to login with OpenSSH

Revoke specific key used to perform key-based login with OpenSSH utilizing simple public key revocation list or OpenSSH Key Revocation List (KRL).