Major of instructions were taken from StackOverflow. Though I didn’t follow all steps plus I also had to deal with SSL module. Anyway the migration was fast and flawless. Just don’t forget to backup you website 🙂 Here are my instructions if you followed AWS tutorial to setup WordPress on Apache with SSL. Note that following these instructions is relatively safe and doesn’t corrupt any WordPress files (if you on Amazon Linux).

This time I had to install Google’s TensorFlow for my wife’s study projects. Unfortunately TensorFlow officially supports only Ubuntu Linux and I didn’t find any tutorial for Amazon Linux. But I was able to find something for Cent OS which is very close, thanks to Tim Hoolihan! First of all I had to install prerequisites. Note that I didn’t use Python’s virtual env. We use Jupyter Notebook front-end for study projects and I don’t know if virtualenv would be handy there.

My last post was about running Jupyter remotely and using SSH tunnel for connections. That appeared to be inconvenient: too many steps for launching Jupyter and then connecting to it. I read through documentation of Notebook website and they have pretty detailed instructions how to run a public server. I’m using AWS EC2 c4 instance with Amazon Linux. In general there are two steps: making server public and then securing it.

Jupyter Notebook is an app for data analysis. The idea is to combine documentation and the code! My wife uses it for her data science courses from Coursera. Once she complained that some tasks took whole night to complete on her laptop. Her Sony Vaio is pretty powerful, but definitely not a mainframe. When I noticed that Notebook is actually a web application I immediately suggested to run it in Amazon AWS!

We’re all used to package managers in Linux distros: Aptitude in Debian, yum in Read Hat, emerge in Gentoo. This list can be continued. I was very surprised when my colleague suggested to install Homebrew on Macbook to get some tools. I did that and I’m happy. Almost all my tools now get installed with brew install. If I’m stuck with Windows on my home laptop I thought maybe there is a package manager for Windows?

The first time in my carrier I had to access SFTP from a server w/o direct access to Internet! Sure thing I had to use proxy. But it took me a while to find a workable solution: sftp -oProxyCommand="nc -X connect -x your_proxy:port %h %p" username@hostname Google suggests a lot of strange tools like proxy-connect, connect etc. But nothing of that is available in CentOS! For the sake of truth I should mention that proxy has to be configured correctly.

4 years ago I got Dell Precision 6400 at my previous job. It’s BIOS is dated 2011. At that time it was a very descent laptop: Intel i7, 8G of RAM, 256Gb SSD disk and 1Gb ATI Radeon 6740M! It came with Windows 7, but I replaced it with Linux Mint (I even had Gentoo for a short time). I liked it and got used to it despite its enormous size and weight.

Yesterday I checked my blog and got “Request timed out”. As you can guess from the title I become a victim of XML RPC exploit. There a lot of info on Internet describing what XML RPC exploit is and how to defend your blog. I will describe how I fought that attack myself. Well, with the help from mighty Google search 🙂 So when I logged into my AWS instance the first symptom was high CPU load from httpd.

I haven’t visited my blog for a while, so was very surprised to see “Error Establishing a Database Connection” page. At first I thought someone had hacked my box 🙂 Instead MySQL server was down. I checked server logs and found fatal errors from mysql: InnoDB: Fatal error: cannot allocate memory for the buffer pool I googled that issue immediately and according to StackExchange my database couldn’t allocate more system memory and process died.

I installed my WordPress blog only 7 days ago. I never shared the link cause it’s kinda my private experiment for fun. But it’s been a second day someone is atacking my website. It’s a simple attack – password guessing– and there is no chance for attacker to succeed as I’m not there old granny and use randomly generated passwords. Anyway it’s exciting to be part of this cruel world!