Monthly Archives: October 2015

RHEL 7 Password recovery procedure.

Everybody thinks the password recovery procedure in RHEL 7 is simple. But it is not. To start with, there are several procedures spread all over the Internet. All are slightly different, all are supposed to run in all situations, with

Posted in RHEL7

RHEL 7 Delta rpms.

Last year there was a discussion whether delta rpms should be activated or not by default in the Fedora 22 distribution, whether this feature should be kept or simply removed. But do you know exactly what delta rpms are? How

Posted in RHEL7

RHEL 7 Entropy mechanisms.

Sometimes to get some entropy you have to do strange things. Do you remember to make sudden mouse movements during SSH keys generation? Where do this entropy come from? Why does everything sometimes seem stopped? How does it work for

Posted in RHEL7

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RHCSA7: Task of the day

Allowed time: 5 minutes.
Create a user called tom. Create a directory named /private. Use an acl to only allow access (rwx) to tom to the private directory.

RHCE7: Task of the day

Allowed time: 10 minutes.
Change the SSH process configuration to only listen on the 443 port.

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