Core dump overflow

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LFCS prep - Managing encrypted partitions

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Today we’ll go over creating LUKS-encrypted partitions with cryptsetup. LUKS (Linux Unified Key Setup) is a block device encryption format that is the standard on Linux systems. Also, because it stores all the necessary data in the partition header, it’s easy to migrate partitions.

LFCS prep - LDAP server and client configuration

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Something that you may come up with in the exam and that I’ve been avoiding is the LDAP topic. In this post we’ll look at server and client configuration for LDAP.

For this scenario, the hostname of my LDAP server is The domain is and the entry is inside /etc/hosts

I used CertDepot as inspiration..the LDAP syntax and topic really keeps me away from approaching it.

LFCS prep - Using firewalld

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Today we’ll look at firewall configuration on CentOS / RedHat by using firewalld, the replacement for iptables. Since they are both mutually exclusive, if you decide to use firewalld, ensure that iptables is not running and cannot be started, by masking the service with systemctl mask iptables

LFCS prep - autofs automounter

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In a previous post we looked at sharing folders with NFS. Now we take a step further to look at a client-only configuration that allows on demand mounting / unmounting of various filesystems. There is no need for /etc/fstab entries and resources are preserved better. The automounter is provided by the autofs package. After installing it, check that the autofs service has been started, before proceeding with the configuration.

LFCS prep - LVM storage management

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Today we’ll look at logical volume management tasks. LVM improves the traditional partition to disk approach, adding flexibility (extending and reducing space), snapshot capabilities and redundancy.