Dev/Docker.md

+## Dependencies
+
+The [Dockerfile](ironapi-gw/Dockerfile) in the main repo is based on a docker image built
+with [Dockerfile_Deps](ironapi-gw/Dockerfile_Deps).
+
+```
+~/ironapi/ironapi-gw/etc[master]$ docker build -t ironapi/ironapi-gw-deps .
+
+```
+## Copy vs Mount
+
+When the main docker image is built, 
+
+```
+~/ironapi/ironapi-gw[master]$ docker build -t ironapi/ironapi-gw .
+
+```
+
+it takes a copy of the current directory to be mounted in /app on startup. 
+
+```
+docker run -t -p 3000:3000 --name ironapigw
+```
+
+Beware: any code changes after building the image will not be available when you run the image! So, `db.conf` needs to be written before building the image, or the current directory can be mounted (this overrides the copy directive in the Dockerfile):
+
+```
+docker run -t -p 3000:3000 --name ironapigw --mount type=bind,source="$(pwd)",target=/app ironapi-gw
+```
+
+## Logging
+
+Docker redirects anything written to STDOUT or STDERR to the configured log driver. To change it from the default "json-file" to syslog, either configure it for the entire host system:
+
+```
+root@ninne:/etc/docker# more daemon.json 
+{
+    "log-driver" : "syslog"
+}
+
+```
+or set it a run time:
+
+    `docker run -t --log-driver syslog`
+
+Them messages end up in the syslog `tail -f /var/log/syslog`
+
+All scripts use the same [[logging configuration|Logging]], which currently sends everything to STDOUT as well as a log file. Note the -t option - it allocates a pseudo-TTY, which also gets us the catalyst access log on STDERR.
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