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scripts: add many kernel_* scripts
I've been using these scripts to quickly push kernels to remote targets hosts and update grub configs for many many years. They have lived inside a git repo at Red Hat for my team, but they would likely be valuable for others to use too. Signed-off-by: Jesper Dangaard Brouer <[email protected]>
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‎scripts/kernel_install.sh

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#!/bin/bash
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# Author: Jesper Dangaard Brouer <[email protected]>
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# License: GPL
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#
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# This script "kernel_install.sh" just installs/copies the binaries into
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# a directory (~/git/kernel/install) with the kernel version (extracted
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# from include/config/kernel.release).
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#
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# It is connected to "kernel_push.sh" which rsync the kernel
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# binaries+modules to a remote host (usually a KVM virtual guest).
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export INSTALL_MOD_PATH=~/git/kernel/install/
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export VER=`cat include/config/kernel.release`
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echo $VER
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CPUS=24
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if [ ! -d "$INSTALL_MOD_PATH" ]; then
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echo "ERROR: Install dir for kernel binaries \"$INSTALL_MOD_PATH\" does not exist"
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exit 3
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fi
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if [ -z "$VER" ]; then
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echo "ERROR: Cannot detect version"
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exit 2
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fi
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rm -rf $INSTALL_MOD_PATH/lib/modules/$VER/kernel/
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make -j${CPUS} modules_install
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export BOOT="$INSTALL_MOD_PATH/boot/"
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[ -d $BOOT ] || mkdir $BOOT
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#cp -v arch/x86/boot/bzImage $BOOT/vmlinuz-$VER
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#cp -v arch/i386/boot/bzImage $BOOT/vmlinuz-$VER
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cp -v arch/x86_64/boot/bzImage $BOOT/vmlinuz-$VER
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cp -v System.map $BOOT/System.map-$VER
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cp -v vmlinux $BOOT/vmlinux-$VER
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cp -v .config $BOOT/config-$VER
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cp -v Module.symvers $BOOT/Module.symvers-$VER
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echo "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"
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echo "-=-=-=- DONE installed kernel:[$VER] -=-=-=-"
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echo "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"

‎scripts/kernel_local_install.sh

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#!/bin/bash
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# Author: Jesper Dangaard Brouer <[email protected]>
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# License: GPL
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#
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# Installs/copies the kerne binaries directly on localhost
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#
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export VER=`cat include/config/kernel.release`
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echo $VER
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if [ -z "$VER" ]; then
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echo "ERROR: Cannot detect version"
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exit 2
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fi
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# Trick so, program can be run as normal user, will just use "sudo"
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if [ "$EUID" -ne 0 ]; then
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# Directly executable easy
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if [ -x $0 ]; then
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sudo "$0"
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exit $?
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fi
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echo "ERROR: cannot perform sudo run of $0"
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exit 4
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fi
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#export INSTALL_MOD_PATH=/var/kernels/git/install/
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export INSTALL_MOD_PATH=/
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rm -rf $INSTALL_MOD_PATH/lib/modules/$VER/kernel/
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make -j 16 modules_install
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export BOOT="$INSTALL_MOD_PATH/boot/"
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[ -d $BOOT ] || mkdir $BOOT
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cp -v arch/x86/boot/bzImage $BOOT/vmlinuz-$VER
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cp -v arch/i386/boot/bzImage $BOOT/vmlinuz-$VER
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cp -v System.map $BOOT/System.map-$VER
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cp -v vmlinux $BOOT/vmlinux-$VER
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cp -v .config $BOOT/config-$VER
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cp -v Module.symvers $BOOT/Module.symvers-$VER || exit 3
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if [ -e /etc/redhat-release ]; then
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# Red Hat version:
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rh_kernel_update="new-kernel-pkg --mkinitrd --depmod --install ${VER}"
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echo "- Detected Red Hat target,"
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echo " run: $rh_kernel_update"
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$rh_kernel_update
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else
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depmod -a ${KERNEL}
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mkinitramfs -o /boot/initrd.img-$VER $VER
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update-grub2
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fi
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echo "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"
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echo "-=-=-=- DONE installed kernel:[$VER] -=-=-=-"
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echo "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"

‎scripts/kernel_push.sh

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#!/bin/bash
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# Author: Jesper Dangaard Brouer <[email protected]>
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# License: GPL
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#
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# This script "kernel_push.sh" rsync the kernel binaries+modules to a
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# remote host (usually a KVM virtual guest). And invokes "new-kernel-pkg"
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# on the remote target, which updates grub.conf appropriately (debian targets
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# uses depmod+mkinitramfs+update-grub2).
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#
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# It depends on kernel binaries have been installed, by the script
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# "kernel_install.sh", which installs/copies the binaries into a
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# directory (~/git/kernel/install)
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#
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BINARIES_PATH=~/git/kernel/install
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#time usage debugging
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#t=time
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t=/usr/bin/time
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if [ -n "$1" ]; then
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export HOST=$1
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else
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if [ -z $HOST ]; then
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echo "ERROR - Please specify HOSTNAME to push to!"
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exit 1
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fi
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fi
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# Target host OS distro e.g. debian
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if [ -n "$2" ]; then
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export TARGET=$2
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echo "Using disto target: $TARGET"
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else
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export TARGET=redhat
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fi
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if [ -z "$VER" ]; then
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export VER=`cat include/config/kernel.release`
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fi
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export KERNEL=$VER
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if [ -z "$KERNEL" ]; then
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echo "ERROR - Cannot detect the Kernel version you want to push"
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exit 2
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fi
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echo "-=-=-=- Pushing kernel:[$VER] to host:[$HOST] -=-=-=-"
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pushd $BINARIES_PATH
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$t rsync -e ssh -avz boot/vmlinuz-${KERNEL} root@${HOST}:/boot/
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$t rsync -e ssh -avz boot/vmlinux-${KERNEL} root@${HOST}:/boot/
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$t rsync -e ssh -avz boot/config-${KERNEL} root@${HOST}:/boot/
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$t rsync -e ssh -avz --delete lib/modules/${KERNEL} root@${HOST}:/lib/modules/
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$t rsync -e ssh -avz boot/System.map-${KERNEL} root@${HOST}:/boot/
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$t rsync -e ssh -avz boot/Module.symvers-${KERNEL} root@${HOST}:/boot/
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popd
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echo "Executing on remote host: ${HOST}"
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echo "Target install distro: $TARGET"
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if [ "$TARGET" == "debian" ]; then
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#Debian version:
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echo " - depmod -a ${KERNEL}"
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$t ssh root@${HOST} depmod -a ${KERNEL}
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echo " - mkinitramfs"
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$t ssh root@${HOST} mkinitramfs -o /boot/initrd.img-${KERNEL} ${KERNEL}
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$t ssh root@${HOST} update-grub2
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elif [ "$TARGET" == "redhat" ]; then
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# Red Hat version:
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rh_kernel_update="new-kernel-pkg --mkinitrd --depmod --install ${KERNEL}"
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# note mkinitrd is slow
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#rh_kernel_update="new-kernel-pkg --depmod --install ${KERNEL}"
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#
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# Try to use --host-only to limit the size of initrd
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#rh_kernel_update="new-kernel-pkg --mkinitrd --host-only --depmod --install ${KERNEL}"
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#
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# Try --host-only and --dracut
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rh_kernel_update="new-kernel-pkg --mkinitrd --dracut --host-only --depmod --install ${KERNEL}"
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echo "- Assuming Red Hat target,"
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echo " run: $rh_kernel_update"
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$t ssh root@${HOST} "$rh_kernel_update"
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else
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echo "ERROR - Unknown install target: $TARGET"
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fi
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# Fedora 17:
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# grub2-mkconfig -o /boot/grub2/grub.cfg
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echo "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"
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echo "-=-=-=- DONE Pushed kernel:[$VER] to host:[$HOST] -=-=-=-"
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echo "-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-"

‎scripts/kernel_remove.sh

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#!/bin/bash
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# Author: Jesper Dangaard Brouer <[email protected]>
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# License: GPL
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#
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# Delete kernel binaries to save harddisk space
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if [ -n "$1" ]; then
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export KERN=$1
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else
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echo " - ERROR - Please specify KERNEL to DELETE!"
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exit 1
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fi
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if [ "$KERN" == "/" ]; then
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echo " - ERROR - dangerus input exit \"$KERN\""
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exit 2
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fi
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echo "DELETE kernel:${KERN}"
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# Trick so, program can be run as normal user, will just use "sudo"
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if [ "$EUID" -ne 0 ]; then
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# Directly executable easy
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if [ -x $0 ]; then
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sudo "$0" "$1"
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exit $?
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fi
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echo "ERROR: cannot perform sudo run of $0"
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exit 4
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fi
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MOD_DIR=/lib/modules/${KERN}
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if [ -d ${MOD_DIR} ]; then
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echo " - Deleting modules dir:${MOD_DIR}"
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rm -rf ${MOD_DIR}
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else
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echo " - WARNING - Modules dir:${MOD_DIR} does NOT exist"
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#exit 4
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fi
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function delete() {
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if [ -n "$1" ]; then
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local prefix=$1
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else
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echo " - WARNING - wrong input to delete()"
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return 1
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fi
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if [ -n "$2" ]; then
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local suffix=$2
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fi
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local file=/boot/${prefix}-${KERN}${suffix}
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if [ -f ${file} ]; then
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echo " - Removing file: $file"
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rm $file
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else
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echo " - WARNING - cannot find file:\"$file\""
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return 2
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fi
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}
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echo " Deleting kernel files"
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delete vmlinuz
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delete vmlinux
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delete System.map
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delete config
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delete initrd .img
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delete initramfs .img
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delete Module.symvers
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# On RedHat: clean up grub
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if [ -e /etc/redhat-release ]; then
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# Red Hat version:
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rh_kernel_remove="new-kernel-pkg --remove ${KERN}"
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echo "- Detected Red Hat target, cleanup grub config"
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echo " run: $rh_kernel_remove"
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$rh_kernel_remove
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else
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echo "Implement cleanup of grub on your distro... please"
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fi

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