Docker has become widely popular in the last couple of years. I use it on a regular basis these days for running Oracle databases on my laptop. Docker is available on all popular Linux distributions, as well as Mac and Windows, and of course Oracle Linux is no exception. Since a long time Docker ships with the Oracle Linux 7 addons yum repository. Having setup Docker on Oracle Linux numerous times, I thought it would be good for me to document my steps for others to follow.
- Update Oracle Linux and UEK to the latest version (OL 7 and UEK5):
- Install yum-config-manager, if not already installed:
yum install yum-utils
- Enable the addons yum repo:
yum-config-manager --enable *addons
- Install docker-engine:
yum install docker-engine
Continue reading “Setting up Docker on Oracle Linux 7”
In general I work almost exclusively on Macs these days. However, for work and various other reasons I always tend to have a VM with Linux on my Mac to test, run, script things. My VM runs Oracle Linux (OL) on VirtualBox. Oracle Linux just makes a lot of sense for me as we run everything on Oracle Linux internally and in general it is a solid Linux distribution. Of course, once in a while I have to update my Linux version as well to make sure that my Linux environment remains on the latest and greatest. Right now is such a time again as Oracle Linux 7 Unbreakable Enterprise Kernel 5 just released. In the past I was always a bit scared about upgrading kernels because I had little clue of what I was doing. 🙂 Turns out that it is a lot easier than one might think, and here is how you do it:
- Download new repo list:
- Enable the new repo:
yum-config-manager --enable ol7_UEKR5
- Upgrade the environment:
- Reboot the environment:
Continue reading “Upgrading UEK kernel on Oracle Linux 7”
Oracle recently launched a new GitHub repository for providing people with Oracle software inside Vagrant boxes. If you have ever setup an Oracle database inside a VirtualBox VM, whether it is as your sandbox environment, to explore Oracle database, or to use it as a full-on development environment, things have just gotten a lot easier for you. With Vagrant, you can now provision an Oracle database inside VirtualBox in a matter of a couple of simple steps.
Continue reading “Creating an Oracle Database Vagrant box”
A while ago I wrote a paper talking about what key capabilities databases should provide for today’s software development world. The title of the paper is “Database Requirements for Modern Development“. It got published originally on the Oracle Technology Network and I just republished it here on my website. You can find it under: https://geraldonit.com/articles/database-requirements-for-modern-development/
Oracle has added Oracle REST Data Services (ORDS) to the Docker build files family on GitHub, which means that you can now easily dockerize ORDS. If you don’t know yet what ORDS is, it’s a free technology from Oracle that allows you to REST-enable your Oracle databases. More specifically, with ORDS you can just fire off regular REST calls to modify or retrieve data from one or many Oracle databases without having to know how to write SQL; not that knowing SQL is a bad thing! 🙂 In modern application and microservices architectures REST has become more and more popular for exchanging information. ORDS enables you to easily exchange data from and to Oracle databases via REST without having to write lines and lines of code yourself. For more information on what ORDS is and what it can do, check out Jeff Smith’s blog post about ORDS.
Continue reading “Creating an Oracle REST Data Services Docker image”
Recently I had the need to share a zip file with a bunch of people that was big enough not to fit into email anymore. So I wanted to get it onto my server so that folks could grab it via SFTP from there. SFTP is setup by default on my Linux environment, so them accessing the machine was trivial. However, I didn’t want to give them full access to the entire machine where they could randomly up- and download files anywhere. What I needed was some way of giving them a user which was self-contained, with no SSH privileges and bound to a single location on the filesystem. Luckily, setting something like this up was much easier than I thought, and here is how you can do it yourself. Note, all commands below are executed as the
useradd <your sftp user> -s /sbin/nologin -M
passwd <your sftp user>
Enter your sftp user password and confirm
Match User <your sftp user>
ChrootDirectory <your sftp user directory>
service sshd restart
Continue reading “Enabling SFTP-only access on Linux”
Oracle has just included Kubernetes support for its VirtualBox Vagrant GitHub repository. With that it’s now easier than ever to get a Kubernetes cluster up and running inside VMs. If you have not come across Vagrant yet, it’s a great tool by HashiCorp for “Development Environments Made Easy“.
- Install VirtualBox
- Install Vagrant
- Clone the GitHub repository git clone https://github.com/oracle/vagrant-boxes
- Change into the
vagrant up master; vagrant ssh master
- Within the master guest, run as
You will be asked to log in to the Oracle Container Registry
vagrant up worker1; vagrant ssh worker1
- Within the worker1 guest, run as
You will be asked to log in to the Oracle Container Registry
- Repeat the last 2 steps for worker2
Your cluster is ready!
Within the master guest you can check the status of the cluster, as the
vagrant user, e.g.:
kubectl get nodes
kubectl get pods --namespace=kube-system
Continue reading “Deploying a Kubernetes cluster with Vagrant on Virtual Box”
I find myself once again in the situation that I have to install the Oracle JDBC driver into my local Maven repository. Usually this is easily accomplished via
mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id> -DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>, see Guide to installing 3rd party JARs for more details on that. However, this time I was thinking to go the extra mile and actually figure out a way of how to do it entirely manually. This comes in handy if you have, for example, Maven integrated in your IDE and the
mvn binary not available to yourself in the command line.
Continue reading “Manually installing a Maven artifact in your local repository”
When it comes to space efficiency Docker still isn’t quite as good as it could be. The layered filesystem used by Docker sometimes occupies more space than is really necessary. Over time, a couple of enhancements have made their way into Docker to allow the build of more space efficient images. The
ADD instruction for example is smart enough to detect (unfortunately only) local compressed archives (and unfortunately only
xz but not
zip archives) and directly adds the uncompressed contents into the image, unlike the
COPY instruction that simply copies a file into the image. The downside of the latter is that space is occupied for the zip archive itself and the extracted contents of the archive, whereas the former will not occupy any space for the archive as it is never added into the image.
Continue reading “How to create small Docker images”
There is this saying in the English language that something is “too big to fail”. It can refer to almost anything, a country, an initiative, a company, etc. What it tries to say is that, whatever the subject, is so big by now that there is simply no chance that it will ever go away again. You may have already heard this saying you may have not. However, I come across this phrase quite a bit in the IT world too. A technology is too big to fail or a company is too big to fail. And yet, the reality is that nothing is too big to fail!
Continue reading “Too big to fail”