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A Journey of a Thousand Miles Begins with a Single Step

List and sort Elasticsearch Indices

Just did this weekend the migration of several Elasticsearch Clusters from v2.4.3 to v5.1.1. The catalog API for indices has new features. You can sort the columns.

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Instant monitoring for Docker with cAdvisor

Google has an Open Source (Apache License 2.0) solution for instant monitoring docker containers, the Container Advisor (cAdvisor). It is a powerful simple solution, for instant monitoring. The drawback, it keeps no history. You may export the data to Elasticsearch, but keep in mind, it is an extra effort and not current post subject. I’m going to introduce you basic problems with docker in this post.

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Oracle 12c on CentOS

Installing Oracle DB 12c on a virtual machine for testing and developing purposes has it advantages. The installation is quite invasive and when it’s done in a virtualbox, it does no harm to your host system at work, which is btw. Windows and a total mess itself. If you follow the installation instructions and restarted the virtual machine I notice few things that didn’t work by trying to access the database from a SQL client.

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netstat on CentOS

Doing some Oracle DB Installation on CentOS, netstat is an essential tool for checking ports. On the minimal installation it is not installed. Check out how to install it.

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Remove Oracle 12c DB software from Windows

Well in my impression Oracle 12c has a habit to put many obstacles for uninstall. :mad: If you find the right spots, it is still manageable. Keep in mind that you have to open the Windows CMD as Administrator. Otherwise the uninstall just goes south. In my case I had to enter at my installation path

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Install VirtualBox Guest Additions on CentOS

The guest additions of VirtualBox require DKMS (Dynamic Kernel Module Support). After every kernel update the modules for VirtualBox are automatically built. Therefore we need to install dkms which is outside the default repository, but in the EPEL (Extra Packages for Enterprise Linux) repository.

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Using proxy in Dockerfile

Using docker in companies with tight security involves using proxies for pulling the image data of dockerhub. In my previous post I illustrated several ways how to enable docker using the proxy. I assume you are using a central local proxy auth server like CNTLM. So no bypassing any auth data. In the Dockerfile itself, it can be used like this:

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Use custom docker registry

Using docker since 2013 allows you to use custom docker registries with the docker pull and push commands. Just add the registry location to the repository name.

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Install docker on CentOS as virtual machine

Working with Windows sucks. Working with Docker and Windows also sucks. Working in a company with Docker and Windows sucks big time. Besides security and proxy everything is a hassle, because connectivity, filesystem or permissions might not work out of a box. Too many workarounds for docker freshmen. So I decided to run docker in a CentOS virtual machine. That is the closest thing to RHEL. This post demonstrates how to get Docker installed and properly configured, so you can work with docker with great pleasure :wink: .

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