05 Disable Firewall
04 Install OEM Agent
06 Move OMR

Contents

  1. 1 Overview
  2. 2 References
  3. 3 Procedure
    1. 3.1 Disable Firewall Daemon on GORDON
    2. 3.2 Stop Firewall Daemon on GORDON
    3. 3.3 Remove Agent on CRONULLA

Overview

Even though I thought I had deployed the agent correctly to GORDON , the agent had not completed configuration.

The problem was that the firewall was still active on GORDON and was preventing the proper handshaking between the agent ( GORDON ) and the server ( CRONULLA ).

References

Procedure

I had two (2) options to fix the firewall stopping the agent communicating with the server:

  1. Set up the firewall rules
  2. Disable the firewall

I would have preferred to go with option #1, but I could not get firewall-config working with legible text. The errors were: 

** (firewall-config:8373): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-wkFdUchAdk: Connection refused

(firewall-config:8373): Pango-WARNING **: failed to choose a font, expect ugly output. engine-type='PangoRenderFc', script='common'

(firewall-config:8373): Pango-WARNING **: failed to choose a font, expect ugly output. engine-type='PangoRenderFc', script='latin'
GLib-GIO-Message: Using the 'memory' GSettings backend.  Your settings will not be saved or shared with other applications.

In the end, I went with option #2.

Disable Firewall Daemon on GORDON

On GORDON , the firewall daemon is disabled: 

systemctl disable firewalld

The output was: 

Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.

Stop Firewall Daemon on GORDON

On GORDON , the firewall daemon is stopped and the status is onfirmed: 

systemctl stop firewalld
systemctl status firewalld

The output was: 

• firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: inactive (dead)

Sep 09 16:52:49 gordon.yaocm.id.au systemd[1]: Starting firewalld - dynamic firewall daemon...
Sep 09 16:52:55 gordon.yaocm.id.au systemd[1]: Started firewalld - dynamic firewall daemon.
Sep 09 20:23:03 gordon.yaocm.id.au systemd[1]: Stopping firewalld - dynamic firewall daemon...
Sep 09 20:23:04 gordon.yaocm.id.au systemd[1]: Stopped firewalld - dynamic firewall daemon.

Remove Agent on CRONULLA

Even with the firewall disabled on GORDON , the agent could not finish the set-up on the server. I had to decommission the agent as follows:


Then I removed the agent home as follows: 

/opt/app/oracle/agent/12.1.0.4/agent_inst/bin/emctl stop agent
rm -fR /opt/app/oracle/agent/12.1.0.4

And re-install the agent again. Now everything seems to be okay.