systemd

systemd is an overhaul of the internals used by Unix and Linux for managing services.  Many long time Unix/Linux administrators and users became familiar with well established System V style internals for reviewing and configuring service start up dependencies.  This decades old legacy is changing with systemd.  The main benefit is much faster boot times and a more flexible structure arranging how services are managed.  The down side in the short term is many familiar administration commands have changed since systemd has little tolerance for rogue administration utilities that system V allowed to flourish, in part due to due various deficiencies in that legacy system.  Following are a number of common Linux operations translated into systemd's new parlance.

New Common Function Commands [edit]

Following are new commands for setting and controlling services that have changed from venerable System V.

# firewall-cmd --list-all

  public (default, active)
    interfaces: ens192
    sources: 
    services: dhcpv6-client ssh
    ports: 
    masquerade: no
    forward-ports: 
    icmp-blocks: 
    rich rules: 

# firewall-cmd --zone=public --add-port=http/tcp --permanent

# firewall-cmd --reload 

# firewall-cmd --list-all

  public (default, active)
    interfaces: ens192
    sources: 
    services: dhcpv6-client ssh
    ports: 80/tcp
    masquerade: no
    forward-ports: 
    icmp-blocks: 
    rich rules:  

# systemctl list-unit-files --type=service

  UNIT FILE                   STATE    VENDOR PRESET
  auditd.service              enabled  enabled      
  auth-rpcgss-module.service  static   -            
  ...
  user-runtime-dir@.service   static   -            
  user@.service               static   -  

Managing Hostname

TecMint: Change System Hostname

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