Upgrading UEK kernel on Oracle Linux 7

linux_penguin_with_logoIn 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:

tl;dr

  1. Download new repo list: wget http://yum.oracle.com/public-yum-ol7.repo
  2. Enable the new repo: yum-config-manager --enable ol7_UEKR5
  3. Upgrade the environment: yum upgrade
  4. Reboot the environment: reboot

Continue reading “Upgrading UEK kernel on Oracle Linux 7”

Creating an Oracle Database Vagrant box

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.

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Database Requirements for Modern Development

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/

Creating an Oracle REST Data Services Docker image

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.

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Enabling SFTP-only access on Linux

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 root user:

tl;dr

  1. useradd <your sftp user> -s /sbin/nologin -M
  2. passwd <your sftp user>
    1. Enter your sftp user password and confirm
  3. vi /etc/ssh/sshd_config
  4. Match User <your sftp user>
       ChrootDirectory <your sftp user directory>
       ForceCommand internal-sftp
       AllowTcpForwarding no
       X11Forwarding no
    
  5. service sshd restart

Continue reading “Enabling SFTP-only access on Linux”