NFS关闭ipv6的支持

当centos 系统禁用IPV6 之后，开启NFS 是会提示以下错误：

# /etc/init.d/nfs start
Starting NFS services:                                     [  OK  ]
Starting NFS mountd: rpc.mountd: svc_tli_create: could not open connection for udp6
rpc.mountd: svc_tli_create: could not open connection for tcp6
rpc.mountd: svc_tli_create: could not open connection for udp6
rpc.mountd: svc_tli_create: could not open connection for tcp6
rpc.mountd: svc_tli_create: could not open connection for udp6
rpc.mountd: svc_tli_create: could not open connection for tcp6
                                                           [FAILED]
Starting NFS daemon: rpc.nfsd: writing fd to kernel failed: errno 111 (Connection refused)
rpc.nfsd: address family inet6 not supported by protocol TCP
rpc.nfsd: unable to set any sockets for nfsd
                                                           [FAILED]

根据启动提示可以获知，inet6地址不被支持，原因是当前主机没有加载ipv6的模块，可以重新加载一遍ipv6模块解决这个问题。
由于我的系统不需要ipv6的支持，可以通过下面的操作，取消NFS的ipv6调用: 注掉 udp6,tcp6后重启nfs。

# cat /etc/netconfig
#
# The network configuration file. This file is currently only used in
# conjunction with the TI-RPC code in the libtirpc library.
#
# Entries consist of:
#
#       <network_id> <semantics> <flags> <protofamily> <protoname> \
#               <device> <nametoaddr_libs>
#
# The <device> and <nametoaddr_libs> fields are always empty in this
# implementation.
#
udp        tpi_clts      v     inet     udp     -       -
tcp        tpi_cots_ord  v     inet     tcp     -       -
#udp6       tpi_clts      v     inet6    udp     -       -
#tcp6       tpi_cots_ord  v     inet6    tcp     -       -
rawip      tpi_raw       -     inet      -      -       -
local      tpi_cots_ord  -     loopback  -      -       -
unix       tpi_cots_ord  -     loopback  -      -       -

启动之后还是报错:

# /etc/init.d/nfs start
Starting NFS services:                                     [  OK  ]
Starting NFS mountd:                                       [FAILED]
Starting NFS daemon: rpc.nfsd: writing fd to kernel failed: errno 111 (Connection refused)
rpc.nfsd: unable to set any sockets for nfsd
                                                           [FAILED]

启动rpcbin:

# /etc/init.d/rpcbind restart
Stopping rpcbind:                                          [FAILED]
Starting rpcbind:                                          [  OK  

再启动NFS :

# /etc/init.d/nfs start
Starting NFS services:                                     [  OK  ]
Starting NFS mountd:                                       [  OK  ]
Starting NFS daemon:                                       [  OK  ]
Starting RPC idmapd:                                       [  OK  ]