[root@oralintest ~]# yum install tigervnc-server
Loaded plugins: langpacks, ulninfo
Resolving Dependencies
--> Running transaction check
---> Package tigervnc-server.x86_64 0:1.8.0-1.el7 will be installed
--> Finished Dependency Resolution
 
Dependencies Resolved
 
===============================================================================================================================================================================
 Package                                       Arch                                 Version                                     Repository                                Size
===============================================================================================================================================================================
Installing:
 tigervnc-server                               x86_64                               1.8.0-1.el7                                 ol7_latest                               213 k
 
Transaction Summary
===============================================================================================================================================================================
Install  1 Package
 
Total download size: 213 k
Installed size: 504 k
Is this ok [y/d/N]: y
Downloading packages:
warning: /var/cache/yum/x86_64/7Server/ol7_latest/packages/tigervnc-server-1.8.0-1.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID ec551f03: NOKEY
Public key for tigervnc-server-1.8.0-1.el7.x86_64.rpm is not installed
tigervnc-server-1.8.0-1.el7.x86_64.rpm                                                                                                                  | 213 kB  00:00:00
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
Importing GPG key 0xEC551F03:
 Userid     : "Oracle OSS group (Open Source Software group) "
 Fingerprint: 4214 4123 fecf c55b 9086 313d 72f9 7b74 ec55 1f03
 Package    : 7:oraclelinux-release-7.4-1.0.4.el7.x86_64 (@anaconda/7.4)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-oracle
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : tigervnc-server-1.8.0-1.el7.x86_64                                                                                                                          1/1
  Verifying  : tigervnc-server-1.8.0-1.el7.x86_64                                                                                                                          1/1
 
Installed:
  tigervnc-server.x86_64 0:1.8.0-1.el7
 
Complete!
[root@oralintest ~]#