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* Build the watchdog app which outputs fwatchdog
* Copy fwatchdog to the directory of each function you want to build.
* Create a service for each function:
```
# docker build -t catservice .
# docker service rm catservice ; docker service create --network=functions --name catservice catservice
```
* Consume it like this:
```
# curl -X POST -d @$HOME/.ssh/id_rsa.pub -H "X-Function: catservice" localhost:8080/
ssh-rsa AAAAB3NzaC1yc2....
```