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Dismantle initramfs by default in EL9/EL10 diskless

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If debugssh is not requsted, the initramfs is not needed.

Do not unshare the mount namespace, leave the kernel relevant namespace 'normal'

Remove some initramfs content to free up some memory.
This commit is contained in:
Jarrod Johnson
2025-07-29 14:26:43 -04:00
parent 7066f85520
commit cfa16237e1
2 changed files with 10 additions and 2 deletions
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7
confluent_osdeploy/el9-diskless/profiles/default/scripts/imageboot.sh
View File

@@ -130,4 +130,9 @@ ln -s /sysroot/lib/modules/$(uname -r) /lib/modules/
mv /lib/firmware /lib/firmware-ramfs
ln -s /sysroot/lib/firmware /lib/firmware
kill $(grep -l ^/usr/lib/systemd/systemd-udevd /proc/*/cmdline|cut -d/ -f 3)
exec /opt/confluent/bin/start_root
if grep debugssh /proc/cmdline >& /dev/null; then
exec /opt/confluent/bin/start_root
else
rm -rf /lib/modules/$(uname -r) /lib/modules/$(uname -r)-ramfs /lib/firmware-ramfs /usr/lib64/libcrypto.so* /usr/lib64/systemd/ /kernel/ /usr/bin/ /usr/sbin/ /usr/libexec/
exec /opt/confluent/bin/start_root -s # share mount namespace, keep kernel callbacks intact
fi

5
confluent_osdeploy/utils/start_root.c
View File

@@ -3,8 +3,11 @@
#include <sys/mount.h>
#define __USE_GNU
#include <sched.h>
#include <string.h>
int main(int argc, char* argv[]) {
unshare(CLONE_NEWNS);
if (argc < 2 || strcmp(argv[1], "-s")) {
unshare(CLONE_NEWNS);
}
mount("/dev", "/sysroot/dev", NULL, MS_MOVE, NULL);
mount("/proc", "/sysroot/proc", NULL, MS_MOVE, NULL);
mount("/sys", "/sysroot/sys", NULL, MS_MOVE, NULL);