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From 0e842c4b8b2796b9ae606da81ec92839af1cc27e Mon Sep 17 00:00:00 2001
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From: Xunlei Pang <xlpang@redhat.com>
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Date: Wed, 16 Aug 2017 13:55:17 +0800
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Subject: [PATCH] dracut.sh: introduce "--no-hostonly-default-device" argument
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Kdump doesn't need default host devices like root, swap, fstab, etc,
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we only care about the dump target which can be added via "--mount"
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or "--add-device". We met several issues that kdump kernel failed
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due to one of those host devices added by dracut, additionally, the
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needless devices(e.g. LVM) consume some appreciable amount of memory
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which is more likely to cause OOM under memory-limited kdump.
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So this patch introduced "--no-hostonly-default-device" to avoid
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adding those default devices as host_devs.
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Signed-off-by: Xunlei Pang <xlpang@redhat.com>
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Cherry-picked from: 37f2fe55d
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Resolves: #1483838
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---
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dracut.8.asc | 4 ++++
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dracut.sh | 9 ++++++++-
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2 files changed, 12 insertions(+), 1 deletion(-)
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diff --git a/dracut.8.asc b/dracut.8.asc
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index 8fd863b9..e097e769 100644
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--- a/dracut.8.asc
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+++ b/dracut.8.asc
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@@ -306,6 +306,10 @@ provide a valid _/etc/fstab_.
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**--no-hostonly-cmdline**:
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Do not store kernel command line arguments needed in the initramfs
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+**--no-hostonly-default-device**:
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+ Do not generate implicit host devices like root, swap, fstab, etc.
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+ Use "--mount" or "--add-device" to explicitly add devices as needed.
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+
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**--hostonly-i18n**:
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Install only needed keyboard and font files according to the host configuration (default).
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diff --git a/dracut.sh b/dracut.sh
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index f4e85095..0b23a838 100755
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--- a/dracut.sh
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+++ b/dracut.sh
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@@ -141,6 +141,10 @@ Creates initial ramdisk images for preloading modules
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in the initramfs
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--no-hostonly-cmdline Do not store kernel command line arguments needed
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in the initramfs
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+ --no-hostonly-default-device
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+ Do not generate implicit host devices like root,
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+ swap, fstab, etc. Use "--mount" or "--add-device"
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+ to explicitly add devices as needed.
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--hostonly-i18n Install only needed keyboard and font files according
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to the host configuration (default).
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--no-hostonly-i18n Install all keyboard and font files available.
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@@ -357,6 +361,7 @@ rearrange_params()
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--long no-host-only \
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--long hostonly-cmdline \
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--long no-hostonly-cmdline \
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+ --long no-hostonly-default-device \
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--long persistent-policy: \
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--long fstab \
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--long help \
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@@ -545,6 +550,8 @@ while :; do
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i18n_install_all_l="yes" ;;
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--no-hostonly-cmdline)
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hostonly_cmdline_l="no" ;;
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+ --no-hostonly-default-device)
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+ hostonly_default_device="no" ;;
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--persistent-policy)
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persistent_policy_l="$2"; PARMS_TO_STORE+=" '$2'"; shift;;
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--fstab) use_fstab_l="yes" ;;
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@@ -1039,7 +1046,7 @@ if (( ${#add_device_l[@]} )); then
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done
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fi
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-if [[ $hostonly ]]; then
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+if [[ $hostonly ]] && [[ "$hostonly_default_device" != "no" ]]; then
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# in hostonly mode, determine all devices, which have to be accessed
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# and examine them for filesystem types
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