A Journey of a Thousand Miles Begins with a Single Step

Provide health check port for Kibana

The new Kibana 5.1.2 x-pack monitoring plugin is a job well done! With the major version, you can also monitor your Kibana instances - yes Kibana can be run clustered :sunglasses:. Having Kibana running in Docker, it allows you deploy it even faster. Back to the monitoring part. It was a real lifesaver and gave me some insights on the Kibana application life-cycle.

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Snapshot and Restore Elasticsearch Indices

As written previously before how to backup the Kibana index, there is more to the snapshot and restore API. A pretty cool feature is the backup capability to Amazon S3 or a Hadoop FS. Furthermore you need to install respective plugins for that. This post demonstrates only a snapshot on a shared filesystem which doesn’t require a plugin. Some commands that were useful during my cluster upgrade.

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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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