Configuring a Network Adapter - Paiet/Tech-Journal-for-Everything GitHub Wiki

  • Configuration methods
    • SysVinit (Script based)
    • systemd (Unit based)
      • NetworkManager (RHEL)
      • NetPlan (Ubuntu)
  • Configuring adapters with interface scripts
    • Used on SysVinit and similar systems
    • RHEL used /etc/sysconfig/network-scripts/
    • Ubuntu used /etc/network/interfaces
    • Global configurations
      • Configurations that apply to all NICs
      • /etc/sysconfig/network
      • GATEWAY=192.168.0.1

[?] What does a typical configuration script look like?

DEVICE=eth0
TYPE=Ethernet
BOOTPROTO=static
IPADDR=192.168.0.2
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
ONBOOT=yes
NM_CONTROLLED=no
  • Using the NetworkManager nmcli command
    • Default in RHEL-based distributions
    • Viewing connections
      • nmcli device status
      • nmcli device show <int_name>
      • nmcli connection show
      • nmcli connection show <int_name>
    • Assigning a static IP
      • nmcli connection edit <int_name>
      • set connection.autoconnect yes
      • set ipv4.method manual
      • set ipv4.addr 192.168.0.2/24
      • set ipv4.dns 8.8.8.8
      • set ipv4.gateway 192.168.0.1
      • save <temporary/persistent>
      • quit
    • Resetting connections
      • nmcli connection reload
      • nmcli connection down <int_name>
      • nmcli connection up <int_name>
  • NetPlan advantages
    • Cloud Init
    • Configuration tests
    • Simple YAML configuration
  • Disable cloud-init
    • sudoedit /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
    • network: {config: disabled}
  • Configuring an adapter with NetPlan
    • Create network configuration
      • sudoedit /etc/netplan/config.yaml
network:
  version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: false
      addresses: [10.0.222.101/16]
      gateway4: 10.0.0.1
      nameservers:
        addresses: [8.8.8.8,8.8.4.4]
  • Apply a NetPlan configuration
    • sudo netplan try
    • sudo netplan apply
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