Welcome to Nick's Random Musings

Gagarin (Vostok-K ~4 launches before crew)

Shepard (Mercury-Redstone ~3 launches)

Komarov (Soyuz 13 +5 launches)

Glenn (Mercury Atlas ~7 launches)

Komarov / Feoktistov / Yegorov (Voskhod ~3 launches)

Grissom / Young (Gemini Titan II ~10 launches)

Schirra, Eisele, Cunningham (Saturn 1B 4 launches)

Borman, Lovell, Anders (Saturn V 3rd launch)

Filipchenko / Rukavishnikov (Soyuz-U +10 launches)

Young / Lovell (Space Shuttle 1st launch )

Liwei (Shenzhou / Chang Zheng 2F 5th launch)

If you are getting the error:

Attempting to renew cert from /etc/letsencrypt/renewal/example.com.conf produced an unexpected error: At least one of the required ports is already taken.. Skipping.

Add hooks to start and stop your webserver in certbot's cron job:

0 */12 * * * root test -x /usr/bin/certbot -a ! -d /run/systemd/system && perl -e 'sleep int(rand(3600))' && certbot -q r enew --pre-hook "service nginx stop" --post-hook "service nginx start"