Solve the error of Oracle startup monitoring

On the Linux virtual machine, start the Oracle listening service:

[oracle@localhost ~]$ lsnrctl start

As a result, a listening error message appears, as follows:

TNS-12537: TNS:connection closed
 TNS-12560: TNS:protocol adapter error
  TNS-00507: Connection closed
   Linux Error: 29: Illegal seek

After many attempts and data access, it is found that the error is caused by the default hostname. At this time, the following steps can be taken to solve the above error reporting problem:

1. modify hostname

[root@localhost oracle]# hostname oracle

Add “host IP oracle” in the/etc/hosts file

[root@oracle oracle]# vim /etc/hosts
...
localhost ip oracle

Add “hostname = oracle” in the etc/sysconfig/network file

[root@oracle oracle]# vim /etc/sysconfig/network
...
hostname=oracle

Restart listening

[root@oracle oracle]# lsnrctl start

After a wave of configuration, monitoring is successfully enabled: