Learning category · Legacy
Older tools still found in production. For maintenance, troubleshooting and migration.
Kept for legacy compatibility, troubleshooting and enterprise maintenance. Do not choose these for new systems; each skill names its modern replacement. Packages
3 levels · 6 courses · 18 skills
0 of 6 skills mastered
2 courses, 6 skills
CoursePlanned
SysVinit, runlevels, chkconfig and init scripts.
SysVinit and Runlevels
Replaced by systemd targets
Services with chkconfig and service
Replaced by systemctl
Init Scripts
Replaced by systemd unit files
3 skills
CoursePlanned
MBR partitioning and the ext2 and ext3 utilities.
fdisk and MBR Partitioning
Replaced by parted, gdisk (GPT)
ext2 and ext3 Utilities
Replaced by ext4, XFS
Converting MBR to GPT and ext3 to ext4
Replaced by GPT, ext4
3 skills
Level
Read, configure and migrate classic networking, firewalls and time services.
0 of 6 skills mastered
2 courses, 6 skills
CoursePlanned
net-tools and iptables, and the move to ip and nftables.
ifconfig and net-tools
Replaced by ip, ss
route and arp
Replaced by ip route, ip neigh
iptables Firewalls
Replaced by nftables, firewalld
Migrating iptables to nftables
Replaced by nftables
4 skills
CoursePlanned
The traditional NTP daemon, and replacing it with chrony.
ntpd and ntpq
Replaced by chrony
Migrating ntpd to chrony
Replaced by chrony
2 skills
0 of 6 skills mastered
2 courses, 6 skills
CoursePlanned
Legacy network scripts, inetd, xinetd and TCP Wrappers.
Legacy Network Scripts
Replaced by NetworkManager
inetd and xinetd
Replaced by systemd socket units
TCP Wrappers
Replaced by firewalld, nftables
3 skills
CoursePlanned
rsh, rlogin and legacy FTP, and how to replace them with SSH.
rsh, rlogin and rcp
Replaced by OpenSSH
Legacy FTP Servers
Replaced by SFTP, rsync
Replacing r-commands with SSH
Replaced by OpenSSH
3 skills