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No protocol specified on CentOS 8.2.2004 with Oracle Database EE 19c when trying to run netmgr

I’m trying to install oracle 19c database on a new installation of CentOS 8.2.2004 (from CentOS-8.2.2004-x86_64-dvd1.iso) in vmware workstation.

I’ve basically done the following as root..

yum install -y gcc-c++
yum install -y ksh
yum install -y sysstat
yum install -y xorg-x11-utils
yum install -y libnsl
yum install -y libaio-devel
yum install -y http://mirror.centos.org/centos/7/os/x86_64/Packages/compat-libcap1-1.10-7.el7.x86_64.rpm
yum install -y http://mirror.centos.org/centos/7/os/x86_64/Packages/compat-libstdc++-33-3.2.3-72.el7.x86_64.rpm
yum install -y https://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/getPackage/oracle-database-preinstall-19c-1.0-1.el7.x86_64.rpm

And installed oracle database…

rpm -Uvh /home/phil/Downloads/oracle-database-ee-19c-1.0-1.x86_64.rpm

Then as the oracle user created by the oracle-database-preinstall, tried to run netmgr (to configure a listener) but it doesn’t run. I am running it all locally in the vm desktop in a terminal window (so not connecting remotely).
This is what I get with some helpful diagnostics..

oracle@localhost bin]$ ./netmgr
No protocol specified
Exiting
java.lang.NullPointerException
    at oracle.ewt.lwAWT.BufferedApplet.<init>(Unknown Source)
    at oracle.sysman.emSDK.client.appContainer.WebApplication.<init>(WebApplication.java:752)
    at oracle.net.mgr.container.NetApplication.<init>(Unknown Source)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at java.lang.Class.newInstance(Class.java:442)
    at oracle.sysman.emSDK.client.appContainer.WebApplication.main(WebApplication.java:3316)
[oracle@localhost bin]$ xhost +
No protocol specified
xhost:  unable to open display ":0"
[oracle@localhost bin]$ echo $DISPLAY
:0
[oracle@localhost bin]$ yum list installed | grep x11
dbus-x11.x86_64                                    1:1.12.8-10.el8_2                             @AppStream   
libxkbcommon-x11.x86_64                            0.9.1-1.el8                                   @AppStream   
pulseaudio-module-x11.x86_64                       11.1-23.el8                                   @AppStream   
xorg-x11-drv-fbdev.x86_64                          0.5.0-2.el8                                   @AppStream   
xorg-x11-drv-libinput.x86_64                       0.29.0-1.el8                                  @AppStream   
xorg-x11-drv-vesa.x86_64                           2.4.0-3.el8                                   @AppStream   
xorg-x11-drv-vmware.x86_64                         13.2.1-8.el8                                  @AppStream   
xorg-x11-font-utils.x86_64                         1:7.5-40.el8                                  @AppStream   
xorg-x11-fonts-Type1.noarch                        7.5-19.el8                                    @AppStream   
xorg-x11-server-Xorg.x86_64                        1.20.6-3.el8                                  @AppStream   
xorg-x11-server-Xwayland.x86_64                    1.20.6-3.el8                                  @AppStream   
xorg-x11-server-common.x86_64                      1.20.6-3.el8                                  @AppStream   
xorg-x11-server-utils.x86_64                       7.7-27.el8                                    @AppStream   
xorg-x11-utils.x86_64                              7.5-28.el8                                    @AppStream   
xorg-x11-xauth.x86_64                              1:1.0.9-12.el8                                @AppStream   
xorg-x11-xinit.x86_64                              1.3.4-18.el8                                  @AppStream   
xorg-x11-xkb-utils.x86_64                          7.7-27.el8                                    @AppStream   
[oracle@localhost bin]$

I can run xterm, it opens up a new terminal window.
I don’t have a ~/Xauthority file.
I’ve tried various values for DISPLAY, including

localhost:0  
localhost:0.0  
:0.0

I get a similar problem running ./runInstaller

[oracle@localhost dbhome_1]$ ./runInstaller 
ERROR: Unable to verify the graphical display setup. This application requires X display. Make sure that xdpyinfo exist under PATH variable.
No protocol specified

Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.

I’ve tried this on vmware workstation AND virtual box.
I’ve also tried this on Oracle Linux 7

..Same problem, Nothing works 🙁

Any ideas?

Regards, Phil Wilkinson

Tags:

4

Answers


  1. Chosen as BEST ANSWER
    0

    I found some installation instructions that were specific to installing oracle19c on CentOS8 (and much simpler)..

    https://www.server-world.info/en/note?os=CentOS_8&p=oracle19c&f=6

    ..and now netmgr works after installing the oracle-database-ee-19c-1.0-1.x86_64.rpm

    So I can only conclude that the instruction I was following screwed up x windows somehow.

    [update]

    I think the crux of my problem was that xhost + didn't work when I su root..

    [root@tc12linux infodba]# xhost +
No protocol specified
xhost:  unable to open display ":0"

    so I dismissed it as not a solution to the 'no protocol' problem, but when I did it from my 'admin' user...

    [infodba@tc12linux ~]$ xhost +
access control disabled, clients can connect from any host

    ...It did!

    And now I am able to launch netmgr and dbca without issue. I just wish I had a better error message to start with. Oh well, thanks for looking at this.


  2. 0

    I don’t know your immediate problem, but you don’t need to run netmgr to configur a listener. Just start the listener with ‘lsnrctl start’. It will happily start with all default values, which is sufficient for 99+% of all cases.

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  3. 0

    If you do not need GUI, use nmtui CLI command to configure your network.

    Or use the more complicated nm command.

    If you need GUI, install the GUI packages first, before installing Oracle DB.

    Here are the instructions to install GUI, on Centos.

    Note that you installed Centos 7 libraries above on Centos 8 machine.

    yum install -y http://mirror.centos.org/centos/7/os/x86_64/Packages/compat-libcap1-1.10-7.el7.x86_64.rpm
yum install -y http://mirror.centos.org/centos/7/os/x86_64/Packages/compat-libstdc++-33-3.2.3-72.el7.x86_64.rpm
yum install -y https://yum.oracle.com/repo/OracleLinux/OL7/latest/x86_64/getPackage/oracle-database-preinstall-19c-1.0-1.el7.x86_64.rpm
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  4. 0

    I would not suggest you install Oracle 19c on Centos 8 yet, Oracle doesn’t fully support RHEL 8 completly.

    However, this is a usefull guide for installation on OL7 and even Centos/OL 8
    https://oracle-base.com/articles/19c/articles-19c#database-19c-installations

    Ps
    I’ve never tried Oracle Installation thru rpm package you used, I suggest a clean and standard Oracle Installation

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