Compiling ipvsadm on different Linux distributions

Introduction

Since IPVS interface to user-space is different in different Linux kernel versions, there are different versions of ipvsadm for IPVS inside the different Linux kernel versions.

For IPVS inside the Linux kernel 2.6, you need to use ipvsadm version 1.24 or later.

For IPVS inside the Linux kernel 2.4, you need to use ipvsadm 1.21 series.

For IPVS patch for the Linux kernel 2.2, you need to use ipvsadm version 1.15.

Red Hat Enterprise Linux 3

On Red Hat Enterprise Linux 3, make sure that kernel-source rpm is installed at system.

[root@penguin src]# rpm -q kernel-source
kernel-source-2.4.21-47.0.1.EL
[root@penguin src]# pwd
/usr/src
[root@penguin src]# ln -s linux-2.4.21-47.0.1.EL linux

Then, we can build the ipvsadm-1.21 rpm in the following command:

rpmbuild --rebuild ipvsadm-1.21-11.src.rpm

Red Hat Enterprise 4

On Red Hat Enterprise Linux 4, make sure that kernel-source rpm is installed at system.

[root@cheetah src]# rpm -q kernel-source
kernel-source-2.6.9-42.0.3.EL
[root@cheetah src]# pwd
/usr/src
[root@cheetah src]# ln -s linux-2.6.9-42.0.3.EL linux

Then, we can build the ipvsadm-1.24 rpm in the following command:

rpmbuild --rebuild ipvsadm-1.24-6.src.rpm

Compiling Error Analysis

Cannot find kernel source directory

Here is the compiling error message

# make
make -C libipvs
make[1]: Entering directory `/var/tmp/ipvsadm-1.24/libipvs'
gcc -Wall -Wunused -Wstrict-prototypes -g -O2 -I/usr/src/linux/include  -DHAVE_NET_IP_VS_H -c -o libipvs.o libipvs.c
In file included from libipvs.c:23:
libipvs.h:14:23: net/ip_vs.h: No such file or directory
In file included from libipvs.c:23:
libipvs.h:119: error: syntax error before "fwmark"
libipvs.h:119: warning: function declaration isn't a prototype
libipvs.c:27: error: field `svc' has incomplete type
libipvs.c:28: error: field `dest' has incomplete type
libipvs.c: In function `ipvs_init':
libipvs.c:40: error: invalid application of `sizeof' to incomplete type `ip_vs_getinfo'
libipvs.c:44: error: `IP_VS_SO_GET_INFO' undeclared (first use in this function)
libipvs.c:44: error: (Each undeclared identifier is reported only once
libipvs.c:44: error: for each function it appears in.)
libipvs.c: In function `ipvs_getinfo':
libipvs.c:56: error: invalid application of `sizeof' to incomplete type `ip_vs_getinfo'
libipvs.c:57: error: `IP_VS_SO_GET_INFO' undeclared (first use in this function)
libipvs.c: In function `ipvs_version':
libipvs.c:64: error: invalid use of undefined type `struct ip_vs_getinfo'
libipvs.c: In function `ipvs_flush':
libipvs.c:70: error: `IP_VS_SO_SET_FLUSH' undeclared (first use in this function)
libipvs.c: In function `ipvs_add_service':
libipvs.c:79: error: `IP_VS_SO_SET_ADD' undeclared (first use in this function)
libipvs.c:79: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_update_service':
libipvs.c:87: error: `IP_VS_SO_SET_EDIT' undeclared (first use in this function)
libipvs.c:87: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_del_service':
libipvs.c:95: error: `IP_VS_SO_SET_DEL' undeclared (first use in this function)
libipvs.c:95: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_zero_service':
libipvs.c:103: error: `IP_VS_SO_SET_ZERO' undeclared (first use in this function)
libipvs.c:103: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_add_dest':
libipvs.c:109: error: dereferencing pointer to incomplete type
libipvs.c:109: error: dereferencing pointer to incomplete type
libipvs.c:112: error: `IP_VS_SO_SET_ADDDEST' undeclared (first use in this function)
libipvs.c: In function `ipvs_update_dest':
libipvs.c:119: error: dereferencing pointer to incomplete type
libipvs.c:119: error: dereferencing pointer to incomplete type
libipvs.c:122: error: `IP_VS_SO_SET_EDITDEST' undeclared (first use in this function)
libipvs.c: In function `ipvs_del_dest':
libipvs.c:129: error: dereferencing pointer to incomplete type
libipvs.c:129: error: dereferencing pointer to incomplete type
libipvs.c:132: error: `IP_VS_SO_SET_DELDEST' undeclared (first use in this function)
libipvs.c: In function `ipvs_set_timeout':
libipvs.c:140: error: `IP_VS_SO_SET_TIMEOUT' undeclared (first use in this function)
libipvs.c:141: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_start_daemon':
libipvs.c:148: error: `IP_VS_SO_SET_STARTDAEMON' undeclared (first use in this function)
libipvs.c:149: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_stop_daemon':
libipvs.c:156: error: `IP_VS_SO_SET_STOPDAEMON' undeclared (first use in this function)
libipvs.c:157: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_get_services':
libipvs.c:166: error: dereferencing pointer to incomplete type
libipvs.c:167: error: invalid application of `sizeof' to incomplete type `libipvs.h'
libipvs.c:167: error: invalid use of undefined type `struct ip_vs_getinfo'
libipvs.c:172: error: dereferencing pointer to incomplete type
libipvs.c:172: error: invalid use of undefined type `struct ip_vs_getinfo'
libipvs.c:174: error: `IP_VS_SO_GET_SERVICES' undeclared (first use in this function)
libipvs.c: In function `ipvs_cmp_services':
libipvs.c:189: error: dereferencing pointer to incomplete type
libipvs.c:189: error: dereferencing pointer to incomplete type
libipvs.c:193: error: dereferencing pointer to incomplete type
libipvs.c:193: error: dereferencing pointer to incomplete type
libipvs.c:197: error: dereferencing pointer to incomplete type
libipvs.c:197: error: dereferencing pointer to incomplete type
libipvs.c:201: error: dereferencing pointer to incomplete type
libipvs.c:201: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_sort_services':
libipvs.c:208: error: dereferencing pointer to incomplete type
libipvs.c:208: error: dereferencing pointer to incomplete type
libipvs.c:209: error: invalid application of `sizeof' to incomplete type `libipvs.h'
libipvs.c: In function `ipvs_get_dests':
libipvs.c:218: error: dereferencing pointer to incomplete type
libipvs.c:218: error: invalid application of `sizeof' to incomplete type `libipvs.h'
libipvs.c:218: error: dereferencing pointer to incomplete type
libipvs.c:224: error: dereferencing pointer to incomplete type
libipvs.c:224: error: dereferencing pointer to incomplete type
libipvs.c:225: error: dereferencing pointer to incomplete type
libipvs.c:225: error: dereferencing pointer to incomplete type
libipvs.c:226: error: dereferencing pointer to incomplete type
libipvs.c:226: error: dereferencing pointer to incomplete type
libipvs.c:227: error: dereferencing pointer to incomplete type
libipvs.c:227: error: dereferencing pointer to incomplete type
libipvs.c:228: error: dereferencing pointer to incomplete type
libipvs.c:228: error: dereferencing pointer to incomplete type
libipvs.c:231: error: `IP_VS_SO_GET_DESTS' undeclared (first use in this function)
libipvs.c: In function `ipvs_cmp_dests':
libipvs.c:243: error: dereferencing pointer to incomplete type
libipvs.c:243: error: dereferencing pointer to incomplete type
libipvs.c:247: error: dereferencing pointer to incomplete type
libipvs.c:247: error: dereferencing pointer to incomplete type
libipvs.c: In function `ipvs_sort_dests':
libipvs.c:253: error: dereferencing pointer to incomplete type
libipvs.c:253: error: dereferencing pointer to incomplete type
libipvs.c:254: error: invalid application of `sizeof' to incomplete type `libipvs.h'
libipvs.c: At top level:
libipvs.c:259: error: syntax error before "fwmark"
libipvs.c:260: warning: function declaration isn't a prototype
libipvs.c: In function `ipvs_get_service':
libipvs.c:264: error: dereferencing pointer to incomplete type
libipvs.c:270: error: dereferencing pointer to incomplete type
libipvs.c:270: error: `fwmark' undeclared (first use in this function)
libipvs.c:271: error: dereferencing pointer to incomplete type
libipvs.c:271: error: `protocol' undeclared (first use in this function)
libipvs.c:272: error: dereferencing pointer to incomplete type
libipvs.c:272: error: `addr' undeclared (first use in this function)
libipvs.c:273: error: dereferencing pointer to incomplete type
libipvs.c:273: error: `port' undeclared (first use in this function)
libipvs.c:274: error: `IP_VS_SO_GET_SERVICE' undeclared (first use in this function)
libipvs.c: In function `ipvs_get_timeout':
libipvs.c:288: error: dereferencing pointer to incomplete type
libipvs.c:293: error: `IP_VS_SO_GET_TIMEOUT' undeclared (first use in this function)
libipvs.c: In function `ipvs_get_daemon':
libipvs.c:309: error: dereferencing pointer to incomplete type
libipvs.c:315: error: `IP_VS_SO_GET_DAEMON' undeclared (first use in this function)
libipvs.c: At top level:
libipvs.c:33: error: storage size of `ipvs_info' isn't known
make[1]: *** [libipvs.o] Error 1
make[1]: Leaving directory `/var/tmp/ipvsadm-1.24/libipvs'
make: *** [libs] Error 2

The problem is that compiler cannot find the kernel source directory. The fix is to make a symbolic link of kernel source directory to /usr/src/linux.