Yearly Archives: 2022

AWS: VPC Flow Logs – an overview and example with CloudWatch Logs Insights
0 (0)

19 July 2022

AWS VPC Flow Logs allow you to log traffic information between network interfaces in a VPC. Further, these logs can be stored in AWS S3 or sent to AWS CloudWatch Logs, while enabling traffic logging does not affect the performance of the network interface in any way. Let’s briefly review the basic concepts, and available… Read More: AWS: VPC Flow Logs – an overview and example with… »

Loading

Arch Linux: pacman – error “HTTP server doesn’t seem to support byte ranges”
0 (0)

30 May 2022

During system upgrade with pacman -Syu, I got internet disruption, and on the next upgrade I got the error from pacman. It sounds like “HTTP server doesn’t seem to support byte ranges. Cannot resume“: [simterm] … ==> Retrieving sources… -> Downloading clightd-5.6.tar.gz… ** Resuming transfer from byte position 12288 % Total % Received % Xferd… Read More: Arch Linux: pacman – error “HTTP server doesn’t seem to… »

Loading

NGINX: IP Geolocation by Cloudflare and “nested” if conditions
0 (0)

2 April 2022

Among other features provided by Cloudflare, it can add a special header with a country value, from where a visitor came. As a Ukrainian, I’d like to ban all visitors from russia, but: redirect all visitors from russian IPs to another web domain – russki-voenny-korabl-idi-nahuy.com during this, I’d like to filter requests and leave requests… Read More: NGINX: IP Geolocation by Cloudflare and “nested” if conditions0 (0) »

Loading

Cloudflare: speed up WordPress with Automatic Platform Optimization plugin
0 (0)

30 March 2022

The rtfm.co.ua blog is quite slow for users. For example, you can test your website using the https://gtmetrix.com: 4.3 seconds till full load! That’s awful. At the bottom of the results, you can check top of issues on a site: At first, the page size is 1.16 MB, which is big enough. The second thing… Read More: Cloudflare: speed up WordPress with Automatic Platform Optimization plugin0 (0) »

Loading

SSH: the “Too many authentication failures” error and its solution
0 (0)

19 March 2022

During an SSH connection, I started getting the “Too many authentication failures” error message from a remote host. The error, and its cause Actually, the root cause is simple: during establishing a new SSH connection, the local ssh-client first tries to use keys, that are loaded by the local ssh-agent, and only after that will… Read More: SSH: the “Too many authentication failures” error and its solution0… »

Loading

Elastic Stack: an overview and ELK installation on Ubuntu 20.04
0 (0)

22 February 2022

The last time I’ve worked with the ELK stack about 7 years ago, see the ELK: установка Elasticsearch+Logstash+Kibana на CentOS. Currently, we are using Logz.io, but its costs going higher and higher, so we started looking at the self-hosted ELK solution to be running on our AWS Elastic Kubernetes Service clusters. So, the task, for… Read More: Elastic Stack: an overview and ELK installation on Ubuntu 20.040… »

Loading