How to run a shell script at startup

Question

On an Amazon S3 Linux instance, I have two scripts called start_my_app and stop_my_app which start and stop forever (which in turn runs my

Answer 1

Working with Python 3 microservices or shell; using Ubuntu Server 18.04 (Bionic Beaver) or Ubuntu 19.10 (Eoan Ermine) or Ubuntu 18.10 (Cosmic Cuttlefish) I always do like these steps, and it worked always too:

1. Creating a microservice called p example "brain_microservice1.service" in my case:

   $ nano /lib/systemd/system/brain_microservice1.service
   

2. Inside this new service that you are in:

   [Unit]
   Description=brain_microservice_1
   After=multi-user.target
   
   [Service]
   Type=simple
   ExecStart=/usr/bin/python3.7 /root/scriptsPython/RUN_SERVICES/microservices    /microservice_1.py -k start -DFOREGROUND
   ExecStop=/usr/bin/python3.7 /root/scriptsPython/RUN_SERVICES/microservices/microservice_1.py -k graceful-stop
   ExecReload=/usr/bin/python3.7 /root/scriptsPython/RUN_SERVICES/microservices/microservice_1.py -k graceful
   PrivateTmp=true
   LimitNOFILE=infinity
   KillMode=mixed
   Restart=on-failure
   RestartSec=5s
   
   [Install]
   WantedBy=multi-user.target
   

3. Give the permissions:

   $ chmod -X /lib/systemd/system/brain_microservice*
   $ chmod -R 775 /lib/systemd/system/brain_microservice*
   

4. Give the execution permission then:

   $ systemctl daemon-reload
   

5. Enable then, this will make then always start on startup

   $ systemctl enable brain_microservice1.service
   

6. Then you can test it;

   $ sudo reboot now

7. Finish = SUCCESS!!

This can be done with the same body script to run shell, react ... database startup script ... any kind os code ... hope this help u...

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