Linux: systemctl

Useful systemctl commands.

System and Service Management Commands

List Loaded Systemd Units and Services

• systemctl
• systemctl list-units --type=service
• systemctl --type=service

Show Running Services

• systemctl list-units --type=service --state=running
• systemctl --type=service --state=running

Check Open Ports and Services

• netstat -ltup | grep zabbix_agentd
• ss -ltup | grep zabbix_agentd

Check Firewall Open Services/Ports

• firewall-cmd --list-services (FirewallD)
• firewall-cmd --list-ports (FirewallD)
• sudo ufw status (UFW Firewall)

Show Service File Content

• systemctl cat portainer.service

Check if Systemd is Running

• ps -eaf | grep [s]ystemd

Analyze Systemd Boot Process

• systemd-analyze
• systemd-analyze blame
• systemd-analyze critical-chain

List All Available Units

• systemctl list-unit-files
• systemctl list-units
• systemctl --failed

Check Service Status

• systemctl is-enabled crond.service
• systemctl status firewalld.service

Manage Services

• List all services: systemctl list-unit-files --type=service
• Start: systemctl start httpd.service
• Restart: systemctl restart httpd.service
• Stop: systemctl stop httpd.service
• Reload: systemctl reload httpd.service
• Status: systemctl status httpd.service
• Check Active: systemctl is-active httpd.service
• Enable: systemctl enable httpd.service
• Disable: systemctl disable httpd.service
• Mask: systemctl mask httpd.service
• Unmask: systemctl unmask httpd.service
• Kill: systemctl kill httpd.service

Manage Mount Points

• List mount points: systemctl list-unit-files --type=mount
• Start: systemctl start tmp.mount
• Stop: systemctl stop tmp.mount
• Restart: systemctl restart tmp.mount
• Reload: systemctl reload tmp.mount
• Status: systemctl status tmp.mount
• Active Check: systemctl is-active tmp.mount
• Enable: systemctl enable tmp.mount
• Disable: systemctl disable tmp.mount
• Mask: systemctl mask tmp.mount
• Unmask: systemctl unmask tmp.mount

Manage Sockets

• List sockets: systemctl list-unit-files --type=socket
• Start: systemctl start cups.socket
• Restart: systemctl restart cups.socket
• Stop: systemctl stop cups.socket
• Reload: systemctl reload cups.socket
• Status: systemctl status cups.socket
• Active Check: systemctl is-active cups.socket
• Enable: systemctl enable cups.socket
• Disable: systemctl disable cups.socket
• Mask: systemctl mask cups.socket
• Unmask: systemctl unmask cups.socket

CPU Utilization (Shares) of a Service

• Check CPU shares: systemctl show -p CPUShares httpd.service