Nginx – Ubuntu 18.04.1 hangs regularly

If you're interested in reordering your UFW rules, this is one way to do it.

$ sudo ufw status numbered

     To                         Action      From
     --                         ------      ----
[ 1] 22                         ALLOW IN    Anywhere
[ 2] 80                         ALLOW IN    Anywhere
[ 3] 443                        ALLOW IN    Anywhere
[ 4] 22 (v6)                    ALLOW IN    Anywhere (v6)
[ 5] 80 (v6)                    ALLOW IN    Anywhere (v6)
[ 6] 443 (v6)                   ALLOW IN    Anywhere (v6)
[ 7] Anywhere                   DENY IN     [ip-to-block]

Say you accidentally added a rule to the end, but you wanted up top.

First you will have remove it from the bottom (7) and add it back.

$ sudo ufw delete 7

Note, be careful of removing multiple rules one after another, their position can change!

Add back your rule to the very top (1):

$ sudo ufw insert 1 deny from [ip-to-block] to any

Log file in /var/log/uwsgi.log showed that I was missing '/srv/askbot/venv/askbot-app' directory as it wasn't mentioned in tutorial at all. After I created it, I was able to start uWsgi.