前提回现
修改了主机名，由hyldb修改为hyl，
配置监听1521端口占用问题
。问题现象
配置监听，警告提示，如下所示：
解决方法
1、检查1521端口
[root@hyl ~]# netstat -a
--查看端口占用情况，查明1521端口并未被占用
Active Internet connections (servers and established)Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 localhost.localdomain:2208 *:* LISTEN tcp 0 0 *:sunrpc *:* LISTEN tcp 0 0 *:pftp *:* LISTEN tcp 0 0 localhost.localdomain:ipp *:* LISTEN tcp 0 0 localhost.localdomain:smtp *:* LISTEN tcp 0 0 localhost.localdomain:2207 *:* LISTEN tcp 0 0 *:ssh *:* LISTEN getnameinfo failedgetnameinfo failedtcp 0 132 [UNKNOWN]:ssh [UNKNOWN]:51492 ESTABLISHED udp 0 0 *:spmp *:* udp 0 0 *:659 *:* udp 0 0 *:37437 *:* udp 0 0 *:mdns *:* udp 0 0 *:sunrpc *:* udp 0 0 *:ipp *:* udp 0 0 *:mdns *:* udp 0 0 *:32372 *:* Active UNIX domain sockets (servers and established)Proto RefCnt Flags Type State I-Node Pathunix 2 [ ACC ] STREAM LISTENING 4226 @ISCSIADM_ABSTRACT_NAMESPACEunix 2 [ ACC ] STREAM LISTENING 4938 /var/run/dbus/system_bus_socketunix 2 [ ACC ] STREAM LISTENING 7578 @/tmp/fam-root-unix 2 [ ACC ] STREAM LISTENING 5021 /var/run/sdpunix 2 [ ACC ] STREAM LISTENING 5102 /var/run/pcscd.communix 2 [ ACC ] STREAM LISTENING 5127 /var/run/acpid.socketunix 2 [ ACC ] STREAM LISTENING 6197 /var/run/cups/cups.sockunix 2 [ ACC ] STREAM LISTENING 6633 /var/run/avahi-daemon/socketunix 2 [ ACC ] STREAM LISTENING 6473 /dev/gpmctlunix 2 [ ACC ] STREAM LISTENING 4212 @ISCSID_UIP_ABSTRACT_NAMESPACEunix 2 [ ] DGRAM 1102 @/org/kernel/udev/udevdunix 2 [ ACC ] STREAM LISTENING 6509 /tmp/.font-unix/fs7100unix 2 [ ACC ] STREAM LISTENING 7135 /tmp/.gdm_socketunix 2 [ ACC ] STREAM LISTENING 7165 /tmp/.X11-unix/X0unix 2 [ ] DGRAM 5161 @/org/freedesktop/hal/udev_eventunix 17 [ ] DGRAM 4527 /dev/logunix 2 [ ACC ] STREAM LISTENING 5152 @/var/run/hald/dbus-R5ibTGYpjnunix 2 [ ACC ] STREAM LISTENING 5153 @/var/run/hald/dbus-1m4p21ErfGunix 2 [ ACC ] STREAM LISTENING 4482 /var/run/audispd_eventsunix 2 [ ] DGRAM 7618 unix 3 [ ] STREAM CONNECTED 7581 @/tmp/fam-root-unix 3 [ ] STREAM CONNECTED 7580 unix 3 [ ] STREAM CONNECTED 7571 /var/run/dbus/system_bus_socketunix 3 [ ] STREAM CONNECTED 7570 unix 3 [ ] STREAM CONNECTED 7448 /tmp/.X11-unix/X0unix 3 [ ] STREAM CONNECTED 7447 unix 3 [ ] STREAM CONNECTED 7364 /tmp/.X11-unix/X0unix 3 [ ] STREAM CONNECTED 7363 unix 3 [ ] STREAM CONNECTED 7261 /tmp/.font-unix/fs7100unix 3 [ ] STREAM CONNECTED 7260 unix 3 [ ] STREAM CONNECTED 7217 /var/run/pcscd.communix 3 [ ] STREAM CONNECTED 7216 unix 3 [ ] STREAM CONNECTED 7264 /tmp/.X11-unix/X0unix 3 [ ] STREAM CONNECTED 7190 unix 3 [ ] STREAM CONNECTED 7177 /var/run/acpid.socketunix 3 [ ] STREAM CONNECTED 7176 unix 2 [ ] DGRAM 7163 unix 3 [ ] STREAM CONNECTED 6636 /var/run/dbus/system_bus_socketunix 3 [ ] STREAM CONNECTED 6635 unix 3 [ ] STREAM CONNECTED 6630 unix 3 [ ] STREAM CONNECTED 6629 unix 2 [ ] DGRAM 6627 unix 2 [ ] DGRAM 6467 unix 2 [ ] DGRAM 6426 unix 2 [ ] DGRAM 6379 unix 2 [ ] DGRAM 6324 unix 2 [ ] DGRAM 6109 unix 2 [ ] DGRAM 6068 unix 2 [ ] DGRAM 5958 unix 3 [ ] STREAM CONNECTED 5930 /var/run/dbus/system_bus_socketunix 3 [ ] STREAM CONNECTED 5929 unix 3 [ ] STREAM CONNECTED 5903 @/var/run/hald/dbus-R5ibTGYpjnunix 3 [ ] STREAM CONNECTED 5902 unix 3 [ ] STREAM CONNECTED 5896 @/var/run/hald/dbus-R5ibTGYpjnunix 3 [ ] STREAM CONNECTED 5893 unix 3 [ ] STREAM CONNECTED 5738 @/var/run/hald/dbus-R5ibTGYpjnunix 3 [ ] STREAM CONNECTED 5737 unix 3 [ ] STREAM CONNECTED 5714 /var/run/acpid.socketunix 3 [ ] STREAM CONNECTED 5713 unix 3 [ ] STREAM CONNECTED 5708 @/var/run/hald/dbus-R5ibTGYpjnunix 3 [ ] STREAM CONNECTED 5707 unix 3 [ ] STREAM CONNECTED 5156 @/var/run/hald/dbus-1m4p21ErfGunix 3 [ ] STREAM CONNECTED 5155 unix 2 [ ] DGRAM 5101 unix 3 [ ] STREAM CONNECTED 5016 /var/run/dbus/system_bus_socketunix 3 [ ] STREAM CONNECTED 5015 unix 2 [ ] DGRAM 4987 unix 2 [ ] DGRAM 4977 unix 3 [ ] STREAM CONNECTED 4942 unix 3 [ ] STREAM CONNECTED 4941 unix 3 [ ] STREAM CONNECTED 4900 unix 3 [ ] STREAM CONNECTED 4899 unix 2 [ ] DGRAM 4798 unix 2 [ ] DGRAM 4543 unix 3 [ ] STREAM CONNECTED 4473 unix 3 [ ] STREAM CONNECTED 4472 <span style="font-size:14px;"> </span>
2、检查hosts
[root@hyl ~]# vi /etc/hosts
修改前：
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 hyldb localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.56.101 hyl
~
~
~
--由于修改了主机名（hyldb修改为hyl），将之前配置中hyldb内容删除
修改为：
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.56.101 hyl
~
~
~
~
3、检查network
# vi /etc/sysconfig/network
--确认添加了如下信息
NETWORKING=yes
HOSTNAME=hyl
4、检查ipv6是否关闭
查看ipv6状态，查看其是否被关闭
[root@hyl ~]# lsmod |grep ipv6
ipv6 435105 17 cnic
xfrm_nalgo 43333 1 ipv6
补充：关闭ipv6方法1） # vim /etc/modprobe.conf在其中加入下面这一行，install ipv6 /bin/true保存并退出，电脑资料
《配置监听1521端口占用问题》(https://www.unjs.com)。2）# vim /etc/sysconfig/network在其中加入下面配置项：NETWORKING_IPV6=noIPV6INIT=no
重启后查询：
[root@hyl ~]# lsmod |grep ipv6
--没有显示ipv6相关信息，表示ipv6已经关闭
5、重启系统后，查看hostname
[root@hyl ~]# hostname
--查询主机名
hyl
6、再次执行netca
配置监听、dbca建库成功。