Related cards:
Nginx Proxy buffer tuning
When a nginx reverse proxy complains about upstreams sending too big headers, tweaking the buffers responsibly can help to prevent this issue.
Example log message:
upstream sent too big header while reading response header from upstream, cli...
HowTo: Fix nginx not reloading with long gzip_types lines
When using many or very long entries of MIME-types that shoudl be gziped in gzip_types directives in nginx you might not be able to successfully reload the service and get this error message instead:
nginx: [emerg] could not build the tes...
Bundler dependency issues with Phusion Passenger
If you get an error message like this:
You have already activated some-gem 1.2.3, but your Gemfile requires some-gem 3.2.1. Since some-gem is a default gem, you can either remove your dependency on it or try updating to a newer version of bundl...
GitLab: Rails Console Tasks
Sometimes you might need to do some task in GitLab which would be tedious if you'd have to do it via the Browser.
There is also an API which you could maybe use!
You can connect to the GitLab internal Rails wit...
Replacing exported resources with puppetdb queries
Instead of using Puppet exported resources you can use the puppetdb_query feature.
This can result...
HowTo: Curl applications that are usually behind reverse proxies with TLS termination without the application redirecting to https schema
A lot of web applications require being called over https, which is a good thing. It's possible to configure this requirement at the web- or proxy server level, where nginx or apache will just redirect every request on http to https. Som...
Why Apple Silicon MacBooks Can Only Use One External Display Through A Dock
It's quite confusing how many external displays are usable with a MacBook that uses an M1 or M2 Chip. Documentation on the Internet is sparse and not even the Geniuses at the Genius Bar are 100% sure. We found out some things and can explain the b...
manual haproxy backend failover
If you want to perform a failover on another haproxy backend server this is the way you should do it:
Gather information
Via hatop
Note: Please mind that the names of frontends / backends / servers are only examples. Mind this when yo...
How to prevent duplicate exported resources across a Puppet Infrastructure
There are cases where we have multiple exported resources that are identical. There are nodes that provide the same services for failover reasons. It is likely to have duplicate resources, when exporting nagios_check from these nodes. From the ...
dumping and restoring PostgreSQL databases
This card is just about creating simple PostgreSQL dumps. This is no instruction for a backup strategy nor a guide for SQL dump performance optimization.
Read before starting
- I will assume that all commands will be executed as local `postgr...
