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Martin Hope
tMC
Asked: 2011-10-22 09:39:18 +0800 CST
  • 3

I'm trying to update the kernel on a CentOS 6 machine with a vanilla 3.1.0-rc10 kernel. It seems to work, except the modules that get created are significantly larger in size than those that come from the distro RPM. Thats an issues, because the mkinitrd command ends up creating a initram file that is 100M (because of the some of all the modules inside) in size. Grub takes forever to load and decompress a 100M initram file at boot.

In short:

  1. I downloaded the kernel code.
  2. Copied the running kernel config from/boot/config-2.6.xxx to .config in my kernel code dir.
  3. ran make oldconfig and accepted the defaults
  4. ran make && make modules_install
  5. ran mkinitrd /boot/initramfs-3.1.0-rc10.x86_64.img 3.1.0-rc10

The resulting /boot/initramfs-3.1.0-rc10.x86_64.img is 100M in size.

Its clearly because the size of the modules is so much larger; picking the qla4xxxx you can see my compiled version is 3.6M vs the distros 116K. This is the case for all the modules.

[root@localhost ~]# ls -lh /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/scsi/qla4xxx/qla4xxx.ko
-rwxr--r--. 1 root root 116K May 19 23:37 /lib/modules/2.6.32-71.el6.x86_64/kernel/drivers/scsi/qla4xxx/qla4xxx.ko
[root@localhost ~]# ls -lh /lib/modules/3.1.0-rc10+/kernel/drivers/scsi/qla4xxx/qla4xxx.ko
-rw-r--r--. 1 root root 3.6M Oct 21 12:57 /lib/modules/3.1.0-rc10+/kernel/drivers/scsi/qla4xxx/qla4xxx.ko

I've done this before without issue; what am I overlooking here?

linux centos redhat kernel kernel-modules
Martin Hope
tMC
Asked: 2011-07-28 09:02:20 +0800 CST
  • 5

I have a private network with a handful of Linux routers all route sharing via OSPF. How do I blackhole private network ranges that I don't have routes for?

In other words, I want to be sure I NEVER route 10.0.0.0/8, 172.16.0.0/12 or 192.168.0.0/24 out to the default gateway. I can't just create static sink (blackhole) routes for these networks as a network within one of the private ranges may get advertised via OSPF.

I could use netfilter to just DROP all traffic going out the default GW connected interface if its in a private range, but I figured iproute2/linux might have had a simpler or more 'correct' solution.

linux routing blackhole iproute2