Linux

Nice things you can do with cURL # Resolve a hostname with a given ip curl http://iix.se --resolve iix.se:80:206.189.18.126 # Run many queries in a loop (either for looping or load testing) curl 'http://localhost:8080/oauth/login?[1-10]' -d '{ "username": "[email protected]", "password": "secret" }' -vvv -H "Content-Type: application/json" # Light load testing an endpoint (Z=parallell, -s/-o removes output, -w sets new output) curl -Z -so /dev/null -w "%{time_total} %{http_code}\n" 'https://acme.system.com/api/endpoint?[1-20]'

I usually don’t have a keyboard key mapped to caps, since I have my caps mapped to escape instead. However, from time to time it still gets activated. So to save me googling-time, this is the easiest way to turn it off: Alternative 1 xmodmap -e "clear Lock" Alternative 2 #! /usr/bin/env python from ctypes import * import subprocess class Display(Structure): """ opaque struct """ X11 = cdll.LoadLibrary("libX11.so.6") X11.XOpenDisplay.restype = POINTER(Display) display = X11.XOpenDisplay(c_int(0)) X11.XkbLockModifiers(display, c_uint(0x0100), c_uint(2), c_uint(0)) X11.XCloseDisplay(display)

Verify cert is correct openssl s_client -connect domoticz.iix.se:443 -servername domoticz.iix.se </dev/null Verify date of expiry for installed cert # HTTPS openssl s_client -connect example.com:443 -servername example.com 2>/dev/null </dev/null | openssl x509 -noout -dates # SMTP % openssl s_client -starttls smtp -connect smtp.iix.se:25 </dev/null 2>/dev/null | openssl x509 -noout -dates

# List hosts sudo salt-key --list-all # Add host sudo salt-key -a hello-hostname # Apply one/several hosts sudo salt 'hello-hostname' state.apply sudo salt 'hello-*' state.apply sudo salt 'hello-hostname' test.ping sudo salt '*' state.apply users ## När något gick fel och man missade att lessa loggen sudo salt-run jobs.list_jobs sudo salt-run jobs.lookup_jid $jobid | less

Open port for a given zone sudo firewall-cmd --zone=FedoraServer --add-port=8080/tcp

Working with certificates in Java This post contains a mix of java and certificate info. Note that you should definitely use the p12 format in Java. Using other types, like p8, usually end up causing issues in the end. One easy way is by creating a custom trust manager The easiest way of doing this is: (See this link for a code example on stackoverflow Create a custom trust manager with your special certs Create a trust manager with the default certs Create a custom trust manager, which takes the custom and the default trust manager and try them both Another way of doing it would be adding the certificate manually to the cacerts file. Note that you will either need the full certificate chain for it to work, or just the root cert might also work. Note that certs added to the java key store must be in DER-format. See below for converting between formats. When adding with the keytool, you will either need to specify the path manually, or add it with the -cacerts flag to add it to the main key store. The keystore will ask you for password, but the password usually is changeit ...

Sometimes when you exec into a docker container normally, the size of the containers terminal will be much smaller than your real screen, making it not work properly. To solve this you need to set COLUMNS and LINES in the containers env: sudo docker exec -e COLUMNS="$(tput cols)" -e LINES="$(tput lines)" -it docker-container bash

If you are using firefox on linux with a dark theme, unstyled input fields will have black background and white text. Sometimes just white text on white background. According to this bug report it has been this way for the last 17 years. To fix it, pop by about:config and add a new key-value (String): "widget.content.gtk-theme-override": "Adwaita:light". After restarting firefox, things will be as they should be.

So maybe sounds like crap is an overstatement, but compared to what it sounds like on windows / macos / my phone it’s not even a comparison. Apparently this is is caused by the pulseaudio-profile being set wrong. You can check available profiles by connecting to the bluetooth headphones and running pacmd list: profiles: headset_head_unit: Headset Head Unit (HSP/HFP) (priority 20, available: unknown) a2dp_sink: High Fidelity Playback (A2DP Sink) (priority 10, available: no) off: Off (priority 0, available: yes) When trying to set the profile, pacmd will refused (related to the available: no): ...

I recently decided to dual boot linux my macbook air from 2014 (or maybe 2015). Apparently dual booting on macOS works really well, since you will enter GRUB on normal boots, but can enter macOS by holding the alt/option key during boot. However, there are no free wifi drivers available, so you will need to download extra non-free drivers, which can be really annoying if you only have wifi to connect by, and wifi doesn’t work. ...