UFW
UFW, or Uncomplicated Firewall, is a simplified firewall management interface that hides the complexity of lower-level packet filtering technologies such as iptables and nftables.
Enabling UFW
sudo ufw enable
You will be prompted to confirm the operation by pressing y, then ENTER.
Command may disrupt existing ssh connections. Proceed with operation (y|n)?
Allowing Connections
sudo ufw allow ssh
sudo ufw allow http
sudo ufw allow https
sudo ufw allow mysql
or
sudo ufw allow 22
sudo ufw allow 80
sudo ufw allow 443
sudo ufw allow 3306
Checking UFW Status and Rules
sudo ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip
To Action From
-- ------ ----
22/tcp ALLOW IN Anywhere
22 ALLOW IN Anywhere
80/tcp ALLOW IN Anywhere
443/tcp ALLOW IN Anywhere
3306/tcp ALLOW IN Anywhere
22/tcp (v6) ALLOW IN Anywhere (v6)
22 (v6) ALLOW IN Anywhere (v6)
80/tcp (v6) ALLOW IN Anywhere (v6)
443/tcp (v6) ALLOW IN Anywhere (v6)
3306/tcp (v6) ALLOW IN Anywhere (v6)
or
sudo ufw status numbered
Status: active
To Action From
-- ------ ----
[ 1] 22/tcp ALLOW IN Anywhere
[ 2] 22 ALLOW IN Anywhere
[ 3] 80/tcp ALLOW IN Anywhere
[ 4] 443/tcp ALLOW IN Anywhere
[ 5] 3306/tcp ALLOW IN Anywhere
[ 6] 22/tcp (v6) ALLOW IN Anywhere (v6)
[ 7] 22 (v6) ALLOW IN Anywhere (v6)
[ 8] 80/tcp (v6) ALLOW IN Anywhere (v6)
[ 9] 443/tcp (v6) ALLOW IN Anywhere (v6)
[10] 3306/tcp (v6) ALLOW IN Anywhere (v6)
