From cdavid68 at gmail.com  Wed Sep 30 16:25:51 2020
From: cdavid68 at gmail.com (David Cohen)
Date: Wed, 30 Sep 2020 16:25:51 +0300
Subject: Create a static network configuration from a DHCP lease`
Message-ID: <CAHOQOwQ6t=DxF+oYyNh+48C9zsgqqFkAzGRZsQ3TGgTZ8jt3DA@mail.gmail.com>

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 ?

Best,
David
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From linux-il at shimi.net  Wed Sep 30 20:01:55 2020
From: linux-il at shimi.net (shimi)
Date: Wed, 30 Sep 2020 20:01:55 +0300
Subject: Create a static network configuration from a DHCP lease`
In-Reply-To: <CAHOQOwQ6t=DxF+oYyNh+48C9zsgqqFkAzGRZsQ3TGgTZ8jt3DA@mail.gmail.com>
References: <CAHOQOwQ6t=DxF+oYyNh+48C9zsgqqFkAzGRZsQ3TGgTZ8jt3DA@mail.gmail.com>
Message-ID: <CAKnt4U8355RUL0ymXcdX92FUZkBBgmWOh4VFRad1ZjcNJVVPwQ@mail.gmail.com>

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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From eden.adogla at gmail.com  Wed Sep 30 21:37:01 2020
From: eden.adogla at gmail.com (Eden Adogla)
Date: Wed, 30 Sep 2020 11:37:01 -0700
Subject: Create a static network configuration from a DHCP lease`
In-Reply-To: <CAKnt4U8355RUL0ymXcdX92FUZkBBgmWOh4VFRad1ZjcNJVVPwQ@mail.gmail.com>
References: <CAHOQOwQ6t=DxF+oYyNh+48C9zsgqqFkAzGRZsQ3TGgTZ8jt3DA@mail.gmail.com>
 <CAKnt4U8355RUL0ymXcdX92FUZkBBgmWOh4VFRad1ZjcNJVVPwQ@mail.gmail.com>
Message-ID: <CAOjEGGtnPEcUS5X7cWEpriKQUq7gZJT+p4r8PFczgCxO5ehCnA@mail.gmail.com>

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
>
> _______________________________________________
> Linux-il mailing list
> Linux-il at cs.huji.ac.il
> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
>
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