Linux System Admin
System tools for fedora/red hat:
- DNS = system-config-bind
- HTTP = system-config-httpd
- NFS = system-config-nfs
- Root password = system-config-rootpassword
- Samba NFS = system-config-samba
- Services = system-config-services
- Authentication = authconfig-gtk
- Date & Time = system-config-date
- Firewall = system-config-firewall
- Language = system-config-language
- Printing = system-config-printer
- SELinux Management = policycoreutils-gui
- Users & Groups = system-config-users
- Configuration Editor = gconf-editor
- Disk Usage Analyzer = gnome-utils
- Disk Utility = gnome-disks
- Kickstart = system-config-kickstart
Enable service to run on boot:
- sudo systemctl enable <service>
- eg: sudo systemctl enable bluetooth.service
Linux Processes
- Show running processes: ps
- Show processes for all users: ps aux
- Display running processes: top
- List processes via config directory (services started at boot via script in this directory ): ls /etc/init.d or ls /etc/rc.d
- list all processes with specific columns ( use -o parameter ): ps -e -o %mem,pid,uid,comm
- Sort output of ps by cpu usage: ps -e --sort=%cpu
Get all processes:
- ps -e
Search for specific process:
- ps -e | grep <processname>
Kill process:
- kill <processID>
Enable SSH
Install the ssh client if not already installed:
- sudo apt install openssh-client
If you want to enable SSH on Ubuntu server, use the following command:
- sudo apt install openssh-server
If ssh in not being allowed remotely you will need to open port 22 on the firewall:
- sudo ufw allow 22