Service Management
In RHEL, you can manage services using systemctl, which allows you to start, stop, restart, enable, and check the status of systemd services. Additionally, you can find and manage running processes using their Process ID (PID) with commands like ps aux, pgrep <service-name>, or kill <PID> for manual control over service-related processes.
RHEL Service Administration
systemclt Commands
View Service Details
systemctl status firewalld
Manage Services
Start a Service
Stop a Service
Soft Kill by Process ID
Hard Kill by Process ID
sudo systemctl start firewalld
sudo systemctl start firewalld
sudo kill 888
sudo kill -9 888
Service Dependancies
systemctl show NetworkManager.service | grep -E 'Requires=|After=|Wants='
You can then query the required services to see if they are running...
ViewServices
systemctl --type=service --state=running | sort
PS
Check Process Memory Usage (KB):
ps -eo pid,user,s,comm,size,vsize,rss --sort -size | head -1; ps -eo pid,user,s,comm,size,vsize,rss --sort -size | grep firewalld
Check Process Usage:
ps aux | head -1; ps aux | grep 888
htop
Viewing with htop
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Enable Required Repositories:
sudo subscription-manager repos --enable codeready-builder-for-rhel-9-$(arch)-rpms
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Install EPEL:
sudo dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm
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Install htop
sudo dnf install -y htop
just run the command htop
journalctl
You can see the logs for specific service. These are great for troubleshooting.
sudo journalctl -u NetworkManager.service
