dhcpcd の概要

dhcpcd は、RFC2131 にて定義されている DHCP クライアントの実装です。 DHCP クライアントは、DHCP を利用してネットワークアドレスが割り当てられたネットワークへのアクセスに用いられます。 dhcpcd は十分な機能を有すると同時に、大変軽量な DHCP クライアントです。

本パッケージは LFS-11.1 において正しくビルドでき動作することが確認されています。


dhcpcd の依存パッケージ


LLVM-12.0.1 (with Clang), ntp-4.2.8p15, chronyd, and ypbind

ユーザー情報: https://wiki.linuxfromscratch.org/blfs/wiki/dhcpcd

dhcpcd のインストール

Recent releases of dhcpcd implement privilege separation. Additional installation steps are necessary to set up the proper environment, which are performed by issuing the following commands as the root user:

install  -v -m700 -d /var/lib/dhcpcd &&

groupadd -g 52 dhcpcd        &&
useradd  -c 'dhcpcd PrivSep' \
         -d /var/lib/dhcpcd  \
         -g dhcpcd           \
         -s /bin/false     \
         -u 52 dhcpcd &&
chown    -v dhcpcd:dhcpcd /var/lib/dhcpcd 

以下のコマンドを実行して dhcpcd をビルドします。

./configure --prefix=/usr                \
            --sysconfdir=/etc            \
            --libexecdir=/usr/lib/dhcpcd \
            --dbdir=/var/lib/dhcpcd      \
            --privsepuser=dhcpcd         &&

ビルド結果をテストする場合は make test を実行します。

root ユーザーになって以下を実行します。

make install


--libexecdir=/usr/lib/dhcpcd: Set a more proper location for dhcpcd internal libraries.

--dbdir=/var/lib/dhcpcd: The default /var/db is not FHS-compliant

--with-hook=...: You can optionally install more hooks, for example to install some configuration files such as ntp.conf. The set of hooks is in the dhcpcd-hooks directory in the build tree.

dhcpcd の設定




If you want to configure network interfaces at boot using dhcpcd, you need to install the systemd unit included in blfs-systemd-units-20210819 package by running the following command as the root user:

make install-dhcpcd


The default behavior of dhcpcd is to set the hostname and the mtu. It also overwrites /etc/resolv.conf and /etc/ntp.conf. These modifications to system configuration files are done by hooks which are stored in /lib/dhcpcd/dhcpcd-hooks. Setup dhcpcd by removing or adding hooks from/to that directory. The execution of hooks can be disabled by using the --nohook (-C) command line option or by the nohook option in the /etc/dhcpcd.conf file.



Make sure that you disable the systemd-networkd service or configure it not to manage the interfaces you want to manage with dhcpcd.

At this point you can test if dhcpcd is behaving as expected by running the following command as the root user:

systemctl start dhcpcd@eth0

To start dhcpcd on a specific interface at boot, enable the previously installed systemd unit by running the following command as the root user:

systemctl enable dhcpcd@eth0

Replace eth0 with the actual interface name.


インストールプログラム: dhcpcd
インストールライブラリ: /usr/lib/dhcpcd/dev/udev.so
インストールディレクトリ: /{usr,var}/lib/dhcpcd, /usr/share/dhcpcd



RFC2131 にて定義されている DHCP クライアントの実装です。


adds udev support for interface arrival and departure; this is because udev likes to rename the interface, which it can't do if dhcpcd grabs it first