By Chris Fidao
Server management for Programmers.
Don’t get caught at 3am with a damaged server, or in the course of your workday battling configuration. how you can administer your servers!
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Additional resources for Servers for Hackers
Sample text
It usually gives some color to text matches in the terminal output, making “ack” easier to spot: Apt 1 51 apt-cache search -n ack | sort | grep ack The output: 1 2 3 4 5 6 7 8 9 ack-grep - grep-like program specifically for large source trees aircrack-ng - wireless WEP/WPA cracking utilities akonadi-backend-mysql - MySQL storage backend for Akonadi akonadi-backend-postgresql - PostgreSQL storage backend for Akonadi akonadi-backend-sqlite - SQLite storage backend for Akonadi alsaplayer-jack - PCM player designed for ALSA (JACK output module) apt-watch-backend - Applet that monitors apt sources for upgrades (backend slave\ )' ...
This will tell SSH to no longer accept connections from the standard port 22. One side affect of this is the need to specify the port when you log in later: Users and Access 1 2 3 4 5 22 # Instead of this: ssh user@hostname # Add the -p flag to specify the port: ssh -p 1234 user@hostname We can take this a step further. If we want to explicitly define a list of users who are allowed to login, use the AllowUsers directive: File: /etc/ssh/sshd_config 1 2 3 # Can define multiple users, # separated by a space AllowUsers someusername anotherusername This tells SSH to only allow logins from the two users listed.
The group name you use is arbitrary. In Ubuntu, we used group sudo. You may have noticed that in Vagrant, your user can run sudo commands without having to enter a password. That’s accomplished by editing the sudoers file as well! The following entry will allow user vagrant to run all commands with sudo without specifying a password: Editing /etc/sudoers via visudo 1 vagrant ALL=(ALL:ALL) NOPASSWD:ALL The “NOPASSWD” directive does just what it says - all commands run using root do not require a password.