Author Archives: Roy

Workaround: Mac OS X High Sierra 10.13.2 – SSH tries to connect via HTTP proxy

With Mac OS X release 10.13.2 Apple introduced a new bug where OpenSSH will attempt to use any web proxy configured from a DAC file. As SSH is not HTTP this will typically not work, resulting in connection timeouts or other … Continue reading

Posted in Mac OS X | Tagged , , , , | Leave a comment

Fast track: Installing Ansible 2.1 stable on Oracle Linux 6.7

Ansible can certainly be installed using prebuilt packages from the EPEL repository, but while convenient, their offering is limited to Ansible 1.9.x – that is to say only versions prior to the major 2.0 release that includes a number of … Continue reading

Posted in Ansible, CentOS, Enterprise Linux, Oracle Linux, Red Hat Enterprise Linux, Technical | Tagged , , , , | 2 Comments

Adding Oracle Database Appliance to ULN

At some point you may want to register an Oracle Database Appliance with the Oracle Unbreakable Linux Network so you can get a critical security update, without running a complete ODA update bundle. However, if you happen to be running … Continue reading

Posted in ODA, Oracle, Technical | Leave a comment

Make Oracle VM 3.2.x console work on OL6

How to make Oracle VM 3.2.x RAS proxy work on OL6 1) Install Iced Tea sudo yum install icedtea-web 2) locate sudo vi /usr/lib/jvm/java-1.7.0-openjdk- 3) comment out the line starting with: jdk.tls.disabledAlgorithms= Additional tip: If the browser can’t connect … Continue reading

Posted in Oracle, Oracle VM | Leave a comment

Fast track: Deploy EM 13c agent on Oracle Linux 6

Key steps to do an initial deploy of the Enterprise Manager 13c agent on Oracle Linux 6 Please note that my fast track posts are intended for lab use only. Install OL6 or deploy VM template from Oracle disable iptables adduser … Continue reading

Posted in Enterprise Manager, Oracle, Technical | Leave a comment

Workaround for OVMM database restore BUG – OVCA 2.0.2 – OVM3.2.8.x

If you ever have to restore the Oracle Virtual Machine Manager database using the provided, chances are that you will end up with a bunch of corrupted or missing tables in the back-end MySQL database schema. Specifically, all tables … Continue reading

Posted in Oracle | Leave a comment

Lesson learned: How to kill an Oracle Virtual Compute Appliance

If you’re having a rather dull afternoon at the office, and you happen to have an OVCA as your personal playground, you can always try this little trick to spice up your day: Point your browser to the Oracle VM … Continue reading

Posted in General, Oracle | Leave a comment

Remove password and watermark from pdf on Ubuntu 14

For this recipe we need ghostscript which is/should be installed by default, as well as pdftk and xpdf-utils: apt-get install pdftk sudo apt-get install xpdf-utils If the PDF is encrypted with a password, remove it using xpdf-utils and ghostscript: pdftops … Continue reading

Posted in Technical, Ubuntu | Tagged , , , | 1 Comment

Fast Track: ElasticSearch on CentOS 6.x on DigitalOcean VPS

yum install wget cd /opt wget –no-cookies –no-check-certificate –header “Cookie:; oraclelicense=accept-securebackup-cookie” “” tar xzf jdk-7u67-linux-x64.tar.gz cd jdk1.7.0_67/ alternatives –install /usr/bin/java java /opt/jdk1.7.0_67/bin/java 2 alternatives –config java alternatives –install /usr/bin/jar jar /opt/jdk1.7.0_67/bin/jar 2 alternatives –install /usr/bin/javac javac /opt/jdk1.7.0_67/bin/javac 2 alternatives –set … Continue reading

Posted in CentOS, ElasticSearch, Technical | Tagged , , , | Leave a comment

Installing MediaWiki 1.20.2 with Oracle 11g Express Edition

I encountered and worked around a couple of issues when installing MediaWiki 1.20.2 with Oracle 11g Express Edition as the database back-end. The solutions below can be also applied to MediaWiki 1.20.0 and 1.20.1. I did the installation on … Continue reading

Posted in Oracle, PHP, Technical | 1 Comment