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This article focuses on "what are the ways to view Linux system services". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the ways to view Linux system services?"

Systemd system Services View for Centos/RHEL 7.x

Starting from CentOS 7.x, CentOS began to use systemd services instead of daemon. The original commands related to managing system startup and management system services were all replaced by systemctl commands.

Systemctl list-unit-files

The output of the command is as follows:

To view all running systemd services, you can run the following command:

Systemctl | more

The output of the command is as follows:

In addition, you can also use the following command:

Systemctl list-units-type service

The output of the command is as follows:

If you want to search for a specific service in the results, you can use pipes and the grep command.

Systemctl | grep "apache2"

The output of the command is as follows:

Use the netstat command to view system services

The Netstat command is used to check active network connections, interface statistical analysis, and routing table status. This command is available in all Linux distributions, and we will then use it to view the system services.

View services and the ports they listen on:

Netstat-pnltu

The output of the command is as follows:

View system services through the system service profile

The configuration file for the service is / etc/services is an ASCII file that contains a range of services that the user program might use. This file includes the service name, port number, protocol used, and some aliases.

For this file, we can use any text tool, such as vim:

Vim / etc/services

The output of the command is as follows:

View systemd service status

In some new versions of Linux systems, some have replaced the init process with systemd. In such a system, how to check the system service? We can use the following syntax:

Systemctl status service_name

For example, to see if the OpenSSH on your system is running, you can run:

Systemctl status sshd

The output of the command is as follows:

Alternatively, you can use the following command format to see if a service is running:

Systemctl is-active service_name

If you use this command, the corresponding command to implement the above example is:

Systemctl is-active sshd

The output of the command is as follows:

At the same time, you can also check whether a service has been enabled by using the following command:

Systemctl is-enabled service_name

For example, to check whether the OpenSSH service has been enabled, you might enter the following command:

Systemctl is-enabled sshd

The output of the command is as follows:

View the service status of previous versions

In fact, it can not be said that in the early days, there are still many such systems, on which the SysV init process is running. For this type of system, the command to view the service status is:

Service service_name status

It is also an example of viewing the OpenSSH status. The corresponding command is:

Service sshd status

The output of the command is as follows:

You can also use the following command to view all service status:

Chkconfig-list

The output of the command is as follows:

At this point, I believe you have a deeper understanding of "what are the methods of viewing Linux system services?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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