Oracle provides several services as 'always free'. In contrast to Azure and Amazon, these include compute instances which remain 'forever' free to use. Although there are some limitations on CPU, disk, network resources, these instances are ideal to use as a remote SSH server and with a little effort a connection target for a locally running SOCKS proxy server. When you configure a browser to use that SOCKS proxy, your web traffic will be send through a secure channel (SSH tunnel) towards the OCI instance and the OCI instance will appear as your browsers client IP for remote sites you visit.
An SSH server in combination with a locally running SOCKS proxy server allows you to browse the internet more securely from for example public Wifi hotspots by routing your internet traffic through a secure channel via a remote server. If you combine this with DNS over HTTPS, which is currently at least available in Firefox and Chrome, it will be more difficult for other parties to analyse your traffic. Also it allows you to access resources from a server outside of a company network which can have benefits for example if you want to check how a company hosted service looks to a customer from the outside. Having a server in a different country as a proxy can also have benefits if certain services are only available from a certain country (a similar benefit as using a VPN or using Tor) or as a means to circumvent censorship.
Do check what is allowed in your company, by your ISP and is legal within your country before using such techniques though. I of course don't want you to do anything illegal and blame me for it ;)
Sunday, February 23, 2020
Saturday, February 1, 2020
HTTP benchmarking using wrk. Parsing output to CSV or JSON using Python
wrk is a modern HTTP benchmarking tool. Using a simple CLI interface you can put simple load on HTTP services and determine latency, response times and the number of successfully processed requests. It has a LuaJIT scripting interface which provides extensibility. A distinguishing feature of wrk compared to for example ab (Apache Bench) is that it requires far less CPU at higher concurrency (it uses threads very efficiently). It does have less CLI features when compared to ab. You need to do scripting to achieve specific functionality. Also you need to compile wrk for yourself since no binaries are provided, which might be a barrier to people who are not used to compiling code.
Parsing the wrk output is a challenge. It would be nice to have a feature to output the results in the same units as CSV or JSON file. More people asked this question and the answer was: do some LuaJIT scripting to achieve that. Since I'm no Lua expert and to be honest, I don't have any people in my vicinity that are, I decided to parse the output using Python (my favorite language for data processing and visualization) and provide you with the code so you don't have to repeat this exercise.
You can see example Python code of this here.
Parsing the wrk output is a challenge. It would be nice to have a feature to output the results in the same units as CSV or JSON file. More people asked this question and the answer was: do some LuaJIT scripting to achieve that. Since I'm no Lua expert and to be honest, I don't have any people in my vicinity that are, I decided to parse the output using Python (my favorite language for data processing and visualization) and provide you with the code so you don't have to repeat this exercise.
You can see example Python code of this here.
