Archives: Ubuntu

Change SSH Port Number

To help prevent/slow any brute force attacks while still having SSH enabled, its a good idea to change your SSH port from the default 22 to something at least 5 digits.

Install “netstat”:

sudo apt install net-tools

Check to see current SSH port:

sudo netstat -tulnp | grep ssh

Check to see current sshd_config configuration:

grep -i port /etc/ssh/sshd_config

Open the sshd_config and search for: “#Port 22”

sudoedit /etc/ssh/sshd_config

Uncomment and change the port number to your preference

Save sshd_config and restart SSH service:

sudo systemctl restart sshd

Confirm SSH daemon now listens to new port:

sudo netstat -tulpn | grep ssh

If necessary add new port to firewall:

sudo ufw allow 12345/tcp

Remove old ports:

sudo ufw status
sudo ufw status numbered
sudo ufw delete #

Permission denied

After running command sudo docker stop <container> I received the below error.

ERROR:

Error response from daemon: cannot stop container: storagenode: permission denied

SOLUTION:

sudo aa-remove-unknown

Updating StorJ on Synology & Ubuntu

Shutdown

sudo docker stop -t 300 storagenode

Start

sudo docker start storagenode

List containers

sudo docker container ls

Update Ubuntu

sudo apt update
sudo apt upgrade -y
sudo reboot

Set Synology to auto-update.