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From 31116110ff0090324a568ce2aba6519a860d66b3 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Renaud=20M=C3=A9trich?= <rmetrich@redhat.com>
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Date: Thu, 11 Jul 2019 10:50:40 +0200
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Subject: [PATCH] rngd: new module running early during boot to help generating
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entropy when system's default entropy sources are poor (e.g. use of SSD disks
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or UEFI RNG not available)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On systems with low entropy at boot, the boot can take up to several
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hours, specially when NBDE is used (e.g. clevis) which makes use of
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the random number generator.
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Enabling rngd service at boot early, because dracut-initqueue runs,
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enables to initialize the random number generator in a couple of seconds
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instead of minutes or hours.
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Signed-off-by: Renaud Métrich <rmetrich@redhat.com>
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(cherry picked from commit adee5b97bc5418b6e357342bb3be20568668aa55)
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Resolves: #1726617
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---
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modules.d/06rngd/module-setup.sh | 39 +++++++++++++++++++++++++++++++++++++++
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modules.d/06rngd/rngd.service | 7 +++++++
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2 files changed, 46 insertions(+)
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diff --git a/modules.d/06rngd/module-setup.sh b/modules.d/06rngd/module-setup.sh
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new file mode 100644
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index 00000000..43d5c2d3
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--- /dev/null
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+++ b/modules.d/06rngd/module-setup.sh
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@@ -0,0 +1,39 @@
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+#!/bin/bash
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+# vim: set tabstop=8 shiftwidth=4 softtabstop=4 expandtab smarttab colorcolumn=80:
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+#
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+# Copyright (c) 2019 Red Hat, Inc.
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+# Author: Renaud Métrich <rmetrich@redhat.com>
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+#
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+# This program is free software: you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation, either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+#
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+
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+depends() {
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+ echo systemd
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+ return 0
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+}
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+
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+check() {
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+ # if there's no rngd binary, no go.
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+ require_binaries rngd || return 1
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+
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+ return 0
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+}
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+
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+install() {
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+ inst rngd
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+ inst_simple "${moddir}/rngd.service" "${systemdsystemunitdir}/rngd.service"
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+ mkdir -p "${initdir}${systemdsystemunitdir}/sysinit.target.wants"
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+ ln -rfs "${initdir}${systemdsystemunitdir}/rngd.service" \
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+ "${initdir}${systemdsystemunitdir}/sysinit.target.wants/rngd.service"
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+}
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diff --git a/modules.d/06rngd/rngd.service b/modules.d/06rngd/rngd.service
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new file mode 100644
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index 00000000..570fbedb
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--- /dev/null
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+++ b/modules.d/06rngd/rngd.service
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@@ -0,0 +1,7 @@
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+[Unit]
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+Description=Hardware RNG Entropy Gatherer Daemon
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+DefaultDependencies=no
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+Before=systemd-udevd.service
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+
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+[Service]
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+ExecStart=/usr/sbin/rngd -f
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