23.2. Network boot options

You can configure network boot options to enable RHEL installation over network connections. These options allow you to set up network interfaces, specify IP addresses, configure bonding, bridging, and VLANs for network-based installations and remote system deployment.

注意

Initialize the network with the dracut tool. For a complete list of dracut options, see the dracut.cmdline(7) man page on your system.

ip=

Use the ip= boot option to configure one or more network interfaces. To configure multiple interfaces, use one of the following methods

use the ip option multiple times, once for each interface; to do so, use the rd.neednet=1 option, and specify a primary boot interface using the bootdev option.
use the ip option once, and then use Kickstart to set up further interfaces. While the configuration with ip= option is applied early in the installation process, the configuration defined in kickstart is applied at a later stage of installation, after the start of the installation program.
This option accepts several different formats. The following tables contain information about the most common options. In the following tables:
The ip parameter specifies the client IP address and IPv6 requires square brackets, for example 192.0.2.1 or [2001:db8::99].
The gateway parameter is the default gateway. IPv6 requires square brackets.
The netmask parameter is the netmask to be used. This can be either a full netmask (for example, 255.255.255.0) or a prefix (for example, 64).

The hostname parameter is the host name of the client system. This parameter is optional.

Expand

表 23.3. Boot option formats to configure the network interface
Boot option format	Configuration method
`ip=method`	Automatic configuration of all interfaces.
`ip=interface:method`	Automatic configuration of a specific interface
`ip=ip::gateway:netmask:hostname:interface:none`	Static configuration, for example, IPv4: `ip=192.0.2.1::192.0.2.254:255.255.255.0:server.example.com:enp1s0:none` IPv6: `ip=[2001:db8::1]::[2001:db8::fffe]:64:server.example.com:enp1s0:none`
`ip=ip::gateway:netmask:hostname:interface:method:mtu`	Automatic configuration of a specific interface with an override

Configuration methods for the automatic interface

The method automatic configuration of a specific interface with an override opens the interface by using the specified method of automatic configuration, such as dhcp, but overrides the automatically obtained IP address, gateway, netmask, host name or other specified parameters. All parameters are optional, so specify only the parameters that you want to override. For the values of the method parameter, see the dracut.cmdline(7) man page on your system.

注意

If you use a boot option that requires network access, such as inst.ks=http://host/path, without specifying the ip option, the default value of the ip option is ip=dhcp..
To connect to an iSCSI target automatically, activate a network device for accessing the target by using the ip=ibft boot option.

nameserver= - The nameserver= option specifies the address of the name server. You can use this option multiple times.
注意
The ip= parameter requires square brackets. However, an IPv6 address does not work with square brackets. An example of the correct syntax to use for an IPv6 address is nameserver=2001:db8::1.
bootdev= - The bootdev= option specifies the boot interface. This option is mandatory if you use more than one ip option.
ifname= - The ifname= options assigns an interface name to a network device with a given MAC address. You can use this option multiple times. The syntax is ifname=interface:MAC. For example:
```
ifname=eth0:01:23:45:67:89:ab
```
注意
The ifname= option is the only supported way to set custom network interface names during installation.
inst.dhcpclass= - The inst.dhcpclass= option specifies the DHCP vendor class identifier. The dhcpd service recognizes this value as vendor-class-identifier. The default value is anaconda-$(uname -srm). To ensure the inst.dhcpclass= option is applied correctly, request network activation during the early stage of installation by also adding the ip option.
inst.waitfornet= - Using the inst.waitfornet=SECONDS boot option causes the installation system to wait for network connectivity before installation. The value given in the SECONDS argument specifies the maximum amount of time to wait for network connectivity before timing out and continuing the installation process even if network connectivity is not present.
vlan=- Use the vlan= option to configure a Virtual LAN (VLAN) device on a specified interface with a given name. The syntax is vlan=name:interface. For example:
```
vlan=vlan5:enp0s1
```
This configures a VLAN device named vlan5 on the enp0s1 interface. The name can take the following forms:
- VLAN_PLUS_VID: vlan0005
- VLAN_PLUS_VID_NO_PAD: vlan5
- DEV_PLUS_VID: enp0s1.0005
- DEV_PLUS_VID_NO_PAD: enp0s1.5
bond= - Use the bond= option to configure a bonding device with the following syntax: bond=name[:interfaces][:options]. Replace name with the bonding device name, interfaces with a comma-separated list of physical (Ethernet) interfaces, and options with a comma-separated list of bonding options. For example:
```
bond=bond0:enp0s1,enp0s2:mode=active-backup,tx_queues=32,downdelay=5000
```
For a list of available options, execute the modinfo bonding command.
bridge= - Use the bridge= option to configure a bridge device with the following syntax: bridge=name:interfaces. Replace name with the desired name of the bridge device and interfaces with a comma-separated list of physical (Ethernet) devices to be used as underlying interfaces in the bridge device. For example:
```
bridge=bridge0:enp0s1,enp0s2
```

23.2. Network boot options

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