random PC tips

Glances screenshot from the Glances documentation I wanted to have an easy way to monitor how my server is doing. Glances is a software that gives you a good overview of your system. So I decided to install it. I have a headless Ubuntu Linux server machine for random programming and hobby projects. It runs a web server and a couple of other services. With "headless" I mean the server doesn't have a monitor or a desktop environment. I also have Home Assistant installed on a Raspberry Pi 4. I wanted to bring the monitoring data there for easy review. Glances allows one to do that. It provides a web interface for directly checking the status of the machine and an API for Home Assistant to gather status data. Glances installation the Ubuntu way is problematic I first tried to install Glances using the built-in package manager apt. This proved to be a bad idea for two reasons. First off, the Glances version that you will get with apt is outdated. Especially if you have an olde...

On ubuntu, edit the file /etc/apache2/conf.d/security and modify the lines starting with ServerTokens and ServerSignature so that they look like this: ServerTokens Prod ServerSignature Off

Today, when I was checking the logs on my server, I noticed that someone was trying to hack it by quessing usernames and passwords. The command cat /var/log/auth.log Returned something like this: Invalid user danica from (attacker ip) input_userauth_request: invalid user danica [preauth] pam_unix(sshd:auth): check pass; user unknown pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=(attacker ip) Failed password for invalid user danica from (attacker ip) port 20135 ssh2 Received disconnect from (attacker ip): 11: Bye Bye [preauth] reverse mapping checking getaddrinfo for (attacker host) [(attacker ip)] failed - POSSIBLE BREAK-IN ATTEMPT! Invalid user daniela from (attacker ip) input_userauth_request: invalid user daniela [preauth] pam_unix(sshd:auth): check pass; user unknown pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=(attacker ip) Failed password for invalid user daniela from (attacker ip) port 120...