Tag Archives: blog

Using WP fail2ban with the CloudFlare API to protect your website

The downside of using WordPress is that many people use it. That makes WordPress a perfect target for attacks. I have some trouble with attacks, and one of the consequences is, that my web server crashes under load. The easiest way to solve this issue would be to ban those IP addresses. I use Fail2ban to protect some other services. So the idea of using Fail2ban to ban IP addresses, that are used for attacks, was obvious.

From the Fail2ban wiki:

Fail2ban scans log files (e.g. /var/log/apache/error_log) and bans IPs that show the malicious signs — too many password failures, seeking for exploits, etc. Generally Fail2Ban is then used to update firewall rules to reject the IP addresses for a specified amount of time, although any arbitrary other action (e.g. sending an email) could also be configured. Out of the box Fail2Ban comes with filters for various services (apache, courier, ssh, etc). read more

The Linux OOM killer strikes again

As a frequent reader of my blog, you might have noticed that vcloudnine.de was unavailable from time to time. Reason for this was, that my server was running out of memory at night.

Running out of memory is bad for system uptime. Sometimes you have to sacrifice someone to help others.

It is the job of the linux ‘oom killer’ to sacrifice one or more processes in order to free up memory for the system when all else fails.

Source: OOM Killer – linux-mm.org read more

2016 – How did it go?

The year 2016 is coming to an end (thank god…). 2016 was a difficult year. One of my goals for 2016 was to write more PowerShell code and to learn Python. I missed both goals. But hey, at least I cleaned up my Git account.I renewed my VCP by passing VCP6 in the first attempt, and I took the VCP7-DTM beta exam (no results yet). Since I am not the guy who attends conferences, I was not attending VMworld in Barcelona or HPE Discover in London. In fact: I was no at no conference or vendor roadshow, because I had an ass full of work. read more

How to dramatically improve website load times

Over the last weeks, I’ve tried to improve the performance of my blog. The side was very slow and the page load times varied between 5 and 10 seconds. Much too long! I’ve reduced time consuming plugins, checked the size of pictures, checked CSS and HTML for misconfiguration/ slow clode and tuned the database. The page load times have not really improved.

Yesterday, I checked the httpd.conf on my webserver and found a little typo (accidentally commented line). After a restart of the Apache webserver, the page load times have dramatically improved (down to 2 – 3 seconds). What had happened? read more

Top vBlog 2015: vcloudnine.de placed on #133

What a great show by Eric Siebert, David Davis, Simon Seagrave and their special guests Scott Davis from Infinio and John Troyer from TechReckoning! If you missed it, watch the recording!

First, I want to thank Eric for his work. If you read tweets like these, you will get a bad conscience.

holy crap, just saved myself 10+ hours of work tabulating top blog votes with some xcel formulas, @alanrenouf & @lamw would be proud read more

Top vBlog 2015 Contest has started

The Top vBlog 2015 voting is now open: Follow this link to vote for your favorite vBlogs.

If you are a frequent reader of virtualization blogs, then you may have heard about the vLaunchPad. It lists hundreds of VMware & virtualization blogs, as well as links to resources and other material. The vLaunchPad is managed by Eric Siebert (@ericsiebertvsphere-land.com) and he organizes year for year the annual Top vBlog voting contest. This year the Top vBlog contest is sponsored by Infinio.

In the 2014 voting my “old” blog was voted on place 292 of 320. I should mention that blazilla.de had only german-language content. In a community, where english is the predominating content language, this result may not surprise. If you are interested in last year’s results, you can find them here. In 2014 I have started vcloudnine.de, but I didn’t nominated it for the 2014 voting. Instead, I nominated blazilla.de for the Top vBlog 2014 contest. This year the tables turned and I have nominated vcloudnine.de for the categories: read more

End-of-year review 2014

The days at the year’s end are usually the time to look back and to draw a resume.

I blogged on blazilla.de for nearly 7 years, but in December 2013 I decided that it was time for a new beginning: New blog platform, new content, another language, but the same topics. In January 2014 I started vcloudnine.de.

Some statistics

Until today, I wrote about 100 blog posts. According to Google Analytics, these are my Top 10 most visited blog posts for 2014:

  1. VMware ESXi 5.5 host doesn’t mount VMFS 5 datastore
  2. Load VMware PowerCLI snap-in automatically in PowerShell ISE
  3. Event ID 4625 – Failure Reason: Domain sid inconsistent
  4. Windows Server 2012 Cluster with VMware vSphere 5.1/ 5.5
  5. Configuring HP StoreOnce VSA and HP Data Protector for HP StoreOnce Catalyst
  6. Deploying HP StoreOnce VSA with HP Data Protector – Part III
  7. Exchange 2013: Event ID 2937 MSExchange ADAccess after public folder migration
  8. Some thoughts about HP 3PAR Adaptive Optimization
  9. Users on Exchange 2013 can’t open public folders or shared mailboxes on an Exchange 2007/ 2010
  10. Trouble with Broadcom NetXtreme II and VMware ESXi

Since January vcloudnine.de was visited about 90.000 times. I think this isn’t a bad score for a new blog and I hope that it will be much more in 2015. Most visitors came from the US. These are the Top 5 countries: read more

Yet another blog…

… about virtualization, storage, networking and IT infrastructure in general. Is that really necessary? Yes! To be honest, this is my second attempt. I’m blogging for nearly seven years on blazilla.de. It’s a well-frequented german blog with a strong focus on HP, Storage, DataCore, VMware and other technical topics. Blogging about technology you’re working with is a good way to share, recap and internalize knowledge. Sharing knowledge is a main driver of the scientific and IT community. If you’re writing about something and you share it, you can give something back to the community. So why the hell do I start a second blog? Because I can. ;) blazilla.de is a blog that is mainly focused on the german IT community. This blog is my attempt to get more visible to the international community and give something back to it. I’m not a native English speaker. But I will try my best. I hope you enjoy this blog. :) read more