Question

start a service only after mysql has entered Active (running) state

I have a service that requires mysql to be fully up and running before it starts otherwise it fails. I have very alrge mysql databases and mysqld takes up to 40 minutes before entering an active (running) state.

I have tried adding After=mysqld.service in the secondary services .service file {unit] section without success. It starts my secondary service ass soon as mysqld is enabled. I have tried using Wants=mysqld.service and Requires=mysqld.service without success.

Any help or suggesstions would be appreciated.

Thank you

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Generally, to declare a strict dependency, you will want both After and Requires:

[Unit]
Description=My application 
After=mysqld.service
Requires=mysqld.service

If for some reason you’re still not have the expected behavior, another option would be to use a script in ExecStartPre that blocks until it can connect to the database. wait-for-it is a useful tool for this: https://github.com/vishnubob/wait-for-it

For more info on working with systemd unit files, check out: