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Modifying existing systemd services
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This example shows how to modify an existing service. Service modification are stored within `/etc/systemd/system`, in a single file or in a subdirectory named after the service. For example, this procedure modifies the `httpd` service.
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Prerequisites
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You are logged in as a user with administrator-level permissions.
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You have a configured `httpd` server running through _systemd_.
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Procedure
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_Systemd_ services can be modified using the `systemctl edit` command.
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# systemctl edit httpd.service
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This creates an override file `/etc/systemd/system/httpd.service.d/override.conf` and opens it in your text editor. Anything you put into this file will be *added* to the existing service file.
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Add your custom configuration. For example:
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[Service]
Restart=always
RestartSec=30
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To replace an option that can be set multiple times, it must cleared first, otherwise the override file will add the option a second time.
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[Service]
ExecStart=
ExecStart=<new command>
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Save the file. _Systemd_ automatically loads the new service configuration.
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Restart the `httpd` service:
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# systemctl restart httpd
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To completely replace (instead of just add to/modify) an existing service file, use `systemctl edit --full`, e.g. `systemctl edit --full httpd.service`. This will create `/etc/systemctl/system/httpd.service`, which will be used instead of the existing service file.
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Related Information
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See link:#common-service-parameters[Common service parameters] for more information about the parameters used in this procedure.
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