Install OpenVSwitch into CentOS 7 userspace

背景

之前写过一篇较详细的CentOS 6下安装openvswitch的文章.

http://blog.163.com/digoal@126/blog/static/16387704020147111358858/

这里简单的介绍一下在centos 7下的安装, 其实差不多. 只是目前openvswitch没有针对CentOS7或rhel7的spec中, 只能生成userspace 安装包, 不能生成kmod包.

使用Docker加OpenVSwitch可以很方便的模拟一些应用场景, OpenVswitch相比bridge多了很多交换机的功能, 例如VLAN, GRE等等.

安装步骤

环境 :

CentOS 7

未开启selinux.

下载源码包

http://openvswitch.org/download/

当前版本 :

http://openvswitch.org/releases/openvswitch-2.3.0.tar.gz

安装详情请参考源码包中的INSTALL.RHEL

1. 安装依赖包

[root@localhost openvswitch-2.3.0]# uname -r  
3.10.0-123.el7.x86_64  
   yum install -y gcc make python-devel openssl-devel graphviz \  
       autoconf automake rpm-build redhat-rpm-config \  
       libtool \  
       kernel-devel-3.10.0-123.el7.x86_64  kernel-debug-devel-3.10.0-123.el7.x86_64   

2. 修复内核BUG. version为内核版本.

       cd /lib/modules/<version>  

应该看到这个链接, 否则是内核BUG, 需要修复 :

lrwxrwxrwx.  1 root root     38 Nov 26 18:15 build -> /usr/src/kernels/3.10.0-123.el7.x86_64  

如果没有这个软链接, 那么需要修复如下 :

       cd /lib/modules/<version>  
       rm build  
       ln -s /usr/src/kernels/<target> build  

3. 创建rpmbuild源码目录

mkdir -p /root/rpmbuild/SOURCES  

4. 安装

[root@localhost soft_bak]# cp openvswitch-2.3.0.tar.gz /root/rpmbuild/SOURCES/  
[root@localhost soft_bak]# cd openvswitch-2.3.0  

生成userspace rpm, 因为依赖kmod包, 但是kmod包又无法生成, 所以必须修改一下spec.

[root@localhost openvswitch-2.3.0]# sed 's/openvswitch-kmod, //g' rhel/openvswitch.spec >rhel/openvswitch_no_kmod.spec  
  
[root@localhost openvswitch-2.3.0]# rpmbuild -bb --without check rhel/openvswitch_no_kmod.spec  
[root@localhost x86_64]# ll /root/rpmbuild/RPMS/x86_64  
total 9488  
-rw-r--r-- 1 root root 2010312 Dec  6 19:06 openvswitch-2.3.0-1.x86_64.rpm  
-rw-r--r-- 1 root root 7702836 Dec  6 19:06 openvswitch-debuginfo-2.3.0-1.x86_64.rpm  

生成kernel module rpm, 失败.(有异常)

[root@localhost openvswitch-2.3.0]# cp rhel/openvswitch-kmod.files /root/rpmbuild/SOURCES/  
[root@localhost openvswitch-2.3.0]# uname -r  
3.10.0-123.el7.x86_64  
[root@localhost openvswitch-2.3.0]# rpmbuild -bb \  
                -D "kversion 3.10.0-123.el7.x86_64" \  
                -D "kflavors default debug kdump" \  # 需删除debug, kdump内核选项才能编译, 但是照样编译错误  
                rhel/openvswitch-kmod-rhel6.spec  

报错比较多

In file included from /root/rpmbuild/BUILD/openvswitch-2.3.0/_default/../datapath/linux/compat/include/net/gre.h:10:0,  
                 from /root/rpmbuild/BUILD/openvswitch-2.3.0/_default/datapath/linux/vport-gre.c:44:  
include/net/gre.h: In function 'gre_handle_offloads':  
include/net/gre.h:42:2: error: implicit declaration of function 'iptunnel_handle_offloads' [-Werror=implicit-function-declaration]  
  return iptunnel_handle_offloads(skb, gre_csum, SKB_GSO_GRE);  
  ^  
include/net/gre.h:42:2: warning: return makes pointer from integer without a cast [enabled by default]  
cc1: some warnings being treated as errors  
make[2]: *** [/root/rpmbuild/BUILD/openvswitch-2.3.0/_default/datapath/linux/vport.o] Error 1  
make[2]: *** [/root/rpmbuild/BUILD/openvswitch-2.3.0/_default/datapath/linux/vport-gre.o] Error 1  
make[2]: *** [/root/rpmbuild/BUILD/openvswitch-2.3.0/_default/datapath/linux/datapath.o] Error 1  
make[1]: *** [_module_/root/rpmbuild/BUILD/openvswitch-2.3.0/_default/datapath/linux] Error 2  
make[1]: Leaving directory `/usr/src/kernels/3.10.0-123.el7.x86_64'  
make: *** [default] Error 2  
make: Leaving directory `/root/rpmbuild/BUILD/openvswitch-2.3.0/_default/datapath/linux'  
error: Bad exit status from /var/tmp/rpm-tmp.gf6noy (%build)  

安装userspace rpm

[root@localhost x86_64]# rpm -ivh openvswitch-2.3.0-1.x86_64.rpm   
Preparing...                          ################################# [100%]  
Updating / installing...  
   1:openvswitch-2.3.0-1              ################################# [100%]  
  
[root@localhost x86_64]# chkconfig --list openvswitch   
  
Note: This output shows SysV services only and does not include native  
      systemd services. SysV configuration data might be overridden by native  
      systemd configuration.  
  
      If you want to list systemd services use 'systemctl list-unit-files'.  
      To see services enabled on particular target use  
      'systemctl list-dependencies [target]'.  
  
openvswitch     0:off   1:off   2:on    3:on    4:on    5:on    6:off  
  
[root@localhost x86_64]# service openvswitch status  
ovsdb-server is not running  
ovs-vswitchd is not running  
  
[root@localhost x86_64]# service openvswitch start  
Starting openvswitch (via systemctl):  [  OK  ]  
  
[root@localhost x86_64]# ovs-vsctl show  
f345b7e3-fcb0-4ef3-8295-36d3ef69ceef  
    ovs_version: "2.3.0"  

参考

1. http://blog.163.com/digoal@126/blog/static/16387704020147111358858/

2.

openvswitch-2.3.0  
-rw-rw-r-- 1 ceph ceph  22691 Aug 15 04:34 INSTALL  
-rw-rw-r-- 1 ceph ceph   3162 Aug 15 04:33 INSTALL.Debian  
-rw-rw-r-- 1 ceph ceph   3200 Aug 15 04:34 INSTALL.DPDK  
-rw-rw-r-- 1 ceph ceph   1862 Aug 15 04:34 INSTALL.Fedora  
-rw-rw-r-- 1 ceph ceph   2584 Aug 15 04:17 INSTALL.KVM  
-rw-rw-r-- 1 ceph ceph   2273 Oct 19  2013 INSTALL.Libvirt  
-rw-rw-r-- 1 ceph ceph   1106 Aug 15 04:34 INSTALL.NetBSD  
-rw-rw-r-- 1 ceph ceph   4886 Aug 15 04:34 INSTALL.RHEL  
-rw-rw-r-- 1 ceph ceph  12806 Aug 15 04:28 INSTALL.SSL  
-rw-rw-r-- 1 ceph ceph   3101 Jul 14 18:28 INSTALL.userspace  
-rw-rw-r-- 1 ceph ceph   7926 Aug 15 04:34 INSTALL.XenServer  

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