Create a static network configuration from a DHCP lease`

[Eden Adogla]

Another approach would be to update hook into the dhclient.d system like
Shimi suggested and then edit the appropriate ifcfg-<interface-name>
scripts found at /etc/sysconfig/network-scripts to hardcode the configs and
then restart the interface. Such a change will guarantee that the config
persists after boot.

Cheers,
Eden.

On Wed, Sep 30, 2020 at 10:03 AM shimi <linux-il at shimi.net> wrote:

>
> On Wed, Sep 30, 2020 at 4:26 PM David Cohen <cdavid68 at gmail.com> wrote:
>
>> Hi,
>> I'm looking for an automated way to convert the DHCP address a
>> server gets during installation to a static IP configuration.
>> I have fixed leases so no future conflict is expected.
>> Is there a ready to use cli tool/script for CentOS 7 ?
>>
>>
> I don't know of an existing solution, however, you can probably throw a
> bash script to /etc/dhcp/dhclient.d/whatever.sh, and in it take the DHCP
> data stored in the variables:
> $interface $new_ip_address $new_subnet_mask $new_routers
> $new_dhcp_lease_time $new_domain_name_servers
>
> and use them in nmcli commands to alter the existing connection to a
> static one with those settings, e.g. something along the lines of:
>
> nmcli con mod "$connection" ipv4.addresses
> $new_ip_address/$new_subnet_mask(may need to convert to CIDR?) gw4
> $new_routers
> nmcli con mod "$connection" ipv4.method manual
> nmcli dev disconnect "$connection"
> nmcli -w 10 dev connect "$connection"
>
> HTH,
>
> -- Shimi
>
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