Compiling a kernel module for openvz VM?

Question

I have an openvz machine which I am root on, it is a virtual machine I am ssh to:

>uname -a
Linux molo 2.6.32-042stab084.25 #1 SMP Wed Feb 12 16:04:42 MSK 2014 x86_64 x86_64 x86_64 GNU/Linux

I am trying to build an hello world kernel module:

hello.c:

#include <linux/module.h>       /* Needed by all modules */
#include <linux/kernel.h>       /* Needed for KERN_INFO */
#include <linux/init.h>         /* Needed for the macros */
static int __init hello_start(void)
{
printk(KERN_INFO "Loading hello module...\n");
printk(KERN_INFO "Hello world\n");
return 0;
}
static void __exit hello_end(void)
{
printk(KERN_INFO "Goodbye Mr.\n");
}
module_init(hello_start);
module_exit(hello_end);

Makefile:

obj-m = hello.o
KVERSION = $(shell uname -r)
all:
        make -C /lib/modules/$(KVERSION)/build M=$(PWD) modules
clean:
        make -C /lib/modules/$(KVERSION)/build M=$(PWD) clean

And when I am trying to compile hello.c:

#make
make -C /lib/modules/2.6.32-042stab084.25/build M=/local/my_modules modules
make: *** /lib/modules/2.6.32-042stab084.25/build: No such file or directory.  Stop.
make: *** [all] Error 2

That is the kernel version uname -r reports

#uname -r
2.6.32-042stab084.25

The following didn't help too:

$sudo apt-get install "linux-headers-$(uname -r)"
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package linux-headers-2.6.32-042stab084.25
E: Couldn't find any package by regex 'linux-headers-2.6.32-042stab084.25'

Here is the /lib/modules directory:

ls /lib/modules/2.6.32-042stab084.25/

modules.alias      modules.ccwmap  modules.dep.bin  modules.ieee1394map  modules.isapnpmap  modules.pcimap    modules.softdep  modules.symbols.bin
modules.alias.bin  modules.dep     modules.devname  modules.inputmap     modules.ofmap      modules.seriomap  modules.symbols  modules.usbmap

Might be easier to get an appropriate response on askubuntu.com — Brian Cain
Might be easier to ask your VPS provider for the development package. — Ignacio Vazquez-Abrams
@IgnacioVazquez-Abrams can't I find the development package by myself online? — 0x90

Alec Istomin Alec Istomin · Accepted Answer · 2014-03-18T01:29:59

Download and install linux-headers package from openvz page (more on http://openvz.org/Installation_on_Debian)

1) Add source

cat << EOF > /etc/apt/sources.list.d/openvz-rhel6.list
deb http://download.openvz.org/debian wheezy main
# deb http://download.openvz.org/debian wheezy-test main
EOF

2) Install

wget http://ftp.openvz.org/debian/archive.key
sudo apt-key add archive.key
sudo apt-get update
sudo apt-get install "linux-headers-$(uname -r)"

Remember that you can only do this from the "Host", not from inside of a OpenVZ VPS. Meaning that loading kernel drivers to kernel is only permitted from the Host and would affect all containers on that Host.

Compiling a kernel module for openvz VM?

hello.c:

Makefile:

ls /lib/modules/2.6.32-042stab084.25/

2 Answers