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Linux Support, Oracle Linux, Red Hat Enterprise Linux, SUSE, Oracle Unbreakable Enterprise Kernel and the Oracle Unbreakable Linux Support Program (ULN) resources, news, and support articles.

What to do next after spinning up a Debian VPS

Recently, I opened an unmanaged VPS hosting account with Digital Ocean (of which I am an affiliate), and created a barebone Debian virtual server. Because the hosting was unmanaged, I had to apply all the system changes to the machine myself. Below were the steps I took to set up the Debian virtual machine after spinning it up for the first time.

Configure Postfix to use a remote SMTP relay server via alternate port

On one of my local Ubuntu workstations at home, I sometimes have the need to send mail out using mailutils/mailx inside of scripts or on the command line. I also don't necessarily want/need to set up an entire mail server on my workstation. In addition, Verizon FiOS doesn't take too kindly to this for purposes of preventing malicious activity, SPAM, etc. They actually block outbound connections on the default SMTP port (25).

Running Carsten Czarski's node-oracledb WebSocket Example

My colleague Carsten Czarski href=""
>recently presented on the href="" >node-oracledb
driver for Node.js. One of his demos used WebSockets. It was a live
demo, not captured in slides. I thought I'd explain how I got it to
run in my Oracle Linux 64 bit environment.

Creating a local ownCloud mount point in Linux using WebDAV

ownCloud is enterprise file sync and share that is self-hosted in your data center, on your servers, using your storage. ownCloud provides Universal File Access through a single front-end to all of your disparate systems. Users can access company files on any device, anytime, from anywhere while IT can manage, control and audit file sharing activity to ensure security and compliance measures are met.
WebDAV (Web Distributed Authoring and Versioning) allows you to "mount" your ownCloud content as a local mount point on your local Linux environment.

Pointing XenServer to a new Open vSwitch Manager (Nicira/NSX)

Our XenServer hypervisors use Nicira/NSX for Software Defined Networking (orchestrated by CloudStack). We had to migrate from one controller to another and that could easily be done by changing the Open vSwitch configuration on the hypervisors, like this: It will then get a list of all nodes and use those to communicate. Although this works, […]

node-oracledb 0.3.1 is on GitHub (Node.js driver for Oracle Database)

On behalf of the development team, I have merged some new features and
fixes to >node-oracledb

Updates for node-oracledb 0.3.1

Ansible – exclude host from playbook execution

By using –limit argument with ansible-playbook command we can exclude a host from playbook execution.
If hostname starts with “!” it will excluded from host execution.
Lets say if we want to exclude host1 and host2 from ansible-playbook execution use following command:
$ ansible-playbook --limit '!hoost1:!host2' yourPlaybook.yml
To exclude only host1 from execution use following command:

What is Hadoop?

This is a nice Video to explain what is Hadoop in Youtube

Python – check if ip is public or private

netaddr is a Python library for representing and manipulating network addresses.
Installing netaddr library:
Use any of following command to install netaddr library
$ sudo pip install netaddr
$ easy_install netaddr

Observe following example for more details:

Joining RHEVM-Manage-Domain tool to join AD Domain

Do note that for Red Hat Enterprise Virtualization you must attach a directory server to the Manager using the Domain Management Tool, engine-manage-domains.
Active Directory
Identity Management (IdM)
Red Hat Directory Server 9 (RHDS 9)
# rhevm-manage-domains add --domain=your_active_directory_domain --user=spmstest --ldap-servers=name_or_ip_address_of_AD_Servers --provider=ad
Restart the ovirt-engine

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