Let's say you have a SysV Init Script named foo
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Copy the file to /etc/init.d/foo
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Enable the SysV service: chkconfig --add foo
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Enable the SysV service: chkconfig foo on
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Start the service: service foo start. After this, systemd-sysv-generator will generate this file/run/systemd/generator.late/foo.service, copy this file to/etc/systemd/systemby running:cp /run/systemd/generator.late/foo.service /etc/systemd/system/foo.service
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Edit /etc/systemd/system/foo.serviceby runningsystemctl edit foo.service, add in the following line tofoo.servie(this makes the service installable)[Install] WantedBy=multi-user.target
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Enable the service: systemd enable foo.service
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(Optional) You can then remove the SysV script by running chkconfig foo off && chkconfig --del foo