• This article discusses how to write to stdout and log to journal simultaneously in Systemd. By using the StandardOutput directive in your service file, you can write output to both stdout and log it to journal simultaneously. Please note that this article is for informational purposes only and should not be considered as professional advice.

Systemd is a system and service manager for Linux operating systems that provides a standard process for controlling system services. It is designed to be backwards compatible with SysV init scripts and provides a number of features such as on-demand starting of daemons, parallel startup of system services, and dependency-based service control logic.

In this article, we will discuss how to write to Stdout and log to Journal Simultaneously in Systemd.

Problem Description

When running a service via Systemd, it is common to want to write output to both stdout and log it to Journal simultaneously. This can be useful for debugging purposes or for logging purposes.

However, by default, Systemd redirects stdout to journal when running a service. This means that if you write output to stdout, it will not be visible in the console or in log files.

Solution

To write output to both stdout and log it to journal simultaneously in Systemd, you can use the StandardOutput directive in your service file.

Here is an example service file:

[Unit]
Description=My Service

[Service]
ExecStart=/usr/bin/my-service
StandardOutput=journal+console

[Install]
WantedBy=multi-user.target

The StandardOutput directive specifies where to send output from the service. By default, Systemd redirects stdout to journal when running a service. However, by setting StandardOutput=journal+console, we can write output to both stdout and log it to journal simultaneously.

The journal+console option specifies that output should be sent both to journal and console.

Conclusion

In this article, we discussed how to write to stdout and log to journal simultaneously in Systemd. By using the StandardOutput directive in your service file, you can write output to both stdout and log it to journal simultaneously.

Please note that this article is for informational purposes only and should not be considered as professional advice.

Frequently Asked Questions (FAQ)

Question: What is Systemd?

Answer: Systemd is a system and service manager for Linux operating systems that provides a standard process for controlling system services.

Question: What is stdout?

Answer: Stdout stands for standard output. It is the default output stream where a program writes its output data.

Question: What is journal?

Answer: Journal is a logging system used by Systemd that stores log data in binary format.

The post How to Write to stdout and Log to Journal Simultaneously in Systemd appeared first on PUPUWEB - Information Resource for Emerging Technology Trends and Cybersecurity.