Nginx proxy with Ansible and letsencrypt for multiple domains

Posted on Thu 25 August 2016 in SysAdmin • Tagged with nginx, proxy, ansible, letsencrypt, ssl

Say you're running an nginx proxy and need to set up multiple domains with different backends.



- hosts: proxy
    letsencrypt_webroot_path: /var/www/letsencrypt/
    letsencrypt_renewal_command_args: '--renew-hook "systemctl restart nginx"'
    - { role …

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Dumping PHP headers

Posted on Mon 07 March 2016 in SysAdmin • Tagged with php, testing, debug

I read this somewhere and want to keep it around.

Sometimes I need to debug HTTPS/header issues in a load balanced environment.

Here's how to dump all the headers in PHP:

/* {DocumentRoot}/headers.php
Show all values defined on $_SERVER */
     while (list($var,$value) = each ($_SERVER)) {
            echo …

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Multiple Ansible versions on Mac

Posted on Thu 03 March 2016 in SysAdmin • Tagged with ansible, testing, debug

I ran into some regression bugs with the latest version of Ansible and wanted to test to confirm a few things before posting bug reports. As I run MacOS at work, Ansible is installed from Brew. If you're lucky, you might still have your old versions around:

$ ls /usr/local …

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Microphone feedback loop with PulseAudio

Posted on Tue 06 October 2015 in Linux • Tagged with alsa, arch, archlinux, pulseaudio

Moving to PulseAudio is pretty painless. Just need to install the package and edit /etc/pulse/client.conf to have:

autospawn = yes

One issue I did have was I kept hearing my microphone input in my headphones using a USB headset.
Fixing this was quite simple - in alsamixer, use F6 …

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Finding out your Solr version

Posted on Thu 01 October 2015 in SysAdmin • Tagged with solr, tomcat

I can never remember how to do this without the GUI so here is the quick command to detect the Solr version you're currently running:

wget -q -O- localhost:8080/solr/admin/registry.jsp | grep -E "spec-version|impl-version"

A helpful StackOverflow link: