Ahmed Aboulnaga - Chronicles of Technology

IOUG Member Spotlight (Dec 2015)

I happen to randomly stumble upon this today when I was searching for an old blog post, so figured it might be interesting to share. This was when I was

OEM

Adding a new WebLogic Domain target to OEM

Adding an Oracle Fusion Middleware/WebLogic Domain target to OEM is not that difficult, albeit must be done manually. Simply navigate to the gear icon, then Add Target > Add Targets Manually. Click on Add Using Guided Process. Now select Oracle Fusion Middleware/WebLogic

OEM

Removing a WebLogic Domain from OEM Cloud Control

When you add a WebLogic Domain target to OEM, it automatically adds a number of target types included in this domain such as Application Deployments, Oracle WebLogic Server, Oracle Coherence Cache, Email Driver, and so on. It's not unusual to have hundreds of targets

OEM

Checking the 2-way communication between OMS and OEM Agent

The Oracle Enterprise Manager (OEM) Cloud Control Agent is installed on each host in your environment. This can be a Linux, Windows, or Solaris host, and typically (though not necessarily) there is 1 agent installed per host. The OEM Agent listens on a default

SSH

Getting ssh_init when using SSH or SCP

When using pscp to transfer a file, you may receive the error: ssh_init: Network error: Cannot assign requested addressThe solution is simple. Simply specify the -P 22 parameter to explicitly connect to the port, and you should be good to go.

SSL

Getting DN mismatch in Java? Use keytool

I wrote some Java code that connects to a secure Oracle Database listener port through JDBC. The code I used is published here. However, every time I execute this code, I receive the following exception: java.sql.SQLRecoverableException: IO Error: Mismatch with the server

Oracle SOA Suite

When is the Oracle SOA Platform ready to accept requests?

If you've started up your Oracle SOA Suite 12c managed servers, and even after the managed server is reporting RUNNING and OK, this doesn't mean that the SOA platform is completely up yet. WebLogic reporting the state of the managed serversEven after the managed

Recovering from a corrupted Embedded LDAP in WebLogic 12c

A customer experienced an issue in Oracle WebLogic 12c in which their Global Roles suddenly disappeared. Not having seen this exact issue before, I did however experience issues in the past where the Embedded LDAP was corrupted. Per Oracle Doc ID 1192253.1, Oracle

Enable 'configuration archive' in WebLogic

When you enable configuration archive in your Oracle WebLogic Server domain, the entire domain configuration is backed up at every server restart. This is pretty much a must-have setting for every domain. There are absolutely no disadvantages in enabling this, and can come in

Linux

Why does Linux report 100% memory usage all the time?

Why does Linux report memory usage as being 99% used even though nothing is running on the server? I'll start with the conclusion: If little swap is being used, then

Keycloak

Install and Startup Keycloak

Keycloak is an open source software product (Apache License 2.0) identity and access management solution. This post walks you through an extremely quick setup of this product. Download KeycloakDownload

SSH

Login to Linux using SSH Keys in PuTTY

This post provides a quick guide to configuring access to a Linux account using SSH keys. Generate a Private and Public Key PairDownload puttygen.exe from here.Click Generate.Move

Linux

Getting "Argument list too long" when using ls

I was trying to count the number of files in a particular directory in Linux using the ls command and received the following error: oracle@soadev:/home/oracle> ls /u01/archive/*.* | wc -l -bash: /bin/ls: Argument list too longTurns out the resolution

Linux

Find directories with largest number of files in Linux

I needed to find the list of directories that had the largest number of files on my Linux file system, searching recursively through the filesystem. Here's the content you can paste in a script: #!/bin/bash if [ $# -ne 1 ];then echo "Usage: `basename $0`

OPatch

Getting OPatch error code 255 and 1

I ran OPatch against my Oracle Access Manager (OAM) 12.2.1.4 installation, and I got the OPatch error code 255. oracle@soadev:/u01/oracle/middleware/OPatch> ./opatch lsinventory OPatch failed with error code 255I guess I had to set the ORACLE_

GCP

Absolutely insane billing from Google Cloud Platform!

Google Cloud Platform (aka GCP) has the most insane approach to charging that I've ever seen. I haven't experienced this with any other cloud service provider such as Amazon Web

Oracle Cloud

Is Oracle Cloud really that cheap?

In January 2019, I conducted performance tests of various compute cloud providers, specifically against services from Amazon Web Services (AWS), Oracle Cloud Infrastructure (OCI), IBM Cloud, Google Cloud Platform (GCP)

WebLogic

OutOfMemoryError when running bsu.sh

I was trying to apply a CPU (Critical Patch Update) on an older version of Oracle WebLogic Server, namely 11g (10.3.6). This is done through the bsu utility. I received the following OutOfMemory exception when trying to apply the patch: oracle@weblogicdev:

Networking

TTL expired in transit on Windows client

Normally I get speeds in excess of 100 Mbps on my home wifi on both uploads and downloads. Speeds during normal operationThis morning, it was down to 6-10 Mbps and I couldn't figure out why. I tried connecting to my router's gateway at 192.

JDeveloper

Running into IntegratedWebLogicServer issues for Windows users with spaces

When attempting to start the IntegratedWebLogicServer in Oracle JDeveloper 12.2.1.3, I received the following error: Error: Could not find or load main class Aboulnaga\AppData\Roaming\JDeveloper\system12.2.1.3.42.170820.0914\DefaultDomainAnd here's a screenshot from the IDE:

JDeveloper

Can't create OSB Business Service in JDeveloper 12.2.1.3

I ran into an error recently where I wasn't able to create a Business Service when developing an Oracle Service Bus (OSB) project in Oracle JDeveloper 12.2.1.3.

Ghost

ER_MUST_CHANGE_PASSWORD_LOGIN on Ghost blog platform

Seems that our Ghost blog platform received the following error when I tried to publish a post: Internal server error, cannot list posts. ER_MUST_CHANGE_PASSWORD_LOGIN: Your password

Don't kid yourself - you're not a Cloud Architect

With the boom in cloud adoption, many IT professionals are looking to formalize their new skillsets by acquiring various cloud certifications. Last week, I took advantage of Oracle's free training

Certification

What you need to pass the OCI Architect Associate certification exam

In March 2020, Oracle announced free access to online learning content and certifications to a broad array of Oracle Cloud certifications for about 2 months (details here). Literally tens of

Compute Cloud

Setting up our compute cloud virtual machines for POCs

We've been doing some quick performance testing of Oracle software on various compute cloud providers that include AWS, Oracle Cloud, IBM Cloud, Google Cloud, and Microsoft Azure. Once the virtual machine is created, most setup/configuration is generally standard. This post is mostly self-documentation