sielaq
commented
7 years ago right.
So basically we use frameworks images like:
https://github.com/eBayClassifiedsGroup/PanteraS/tree/master/frameworks
that provides that functionality.
I think the best description how it works is to try step-by-step this example: https://github.com/eBayClassifiedsGroup/PanteraS/tree/master/examples/SmoothWebappPython
- Build the image
- Deploy it
- go inside the container like
docker exec -ti 9670e6203c2c bash - you should see that:
bash-4.3# ps axuf PID USER TIME COMMAND 1 root 0:00 {start.sh} /bin/bash /usr/local/bin/start.sh cd /opt/web/ && python3 -m http.server --cgi 6 root 0:00 {start.sh} /bin/bash /usr/local/bin/start.sh cd /opt/web/ && python3 -m http.server --cgi 7 root 0:00 python3 -m http.server --cgi 8 root 0:00 bash 13 root 0:00 ps axuf - Now check what is inside
cat /usr/local/bin/start.sh, you are interested in that part:maintenance(){ # Container name will be provided by mesos: MESOS_CONTAINER_NAME=${MESOS_CONTAINER_NAME:-$CONTAINER_NAME} # Mesos provides external ports in coma separated $PORTS for port in $(sed 's/,/ /g'<<<${PORTS}) do # For each extenal ports you can map internal one from PORT_${int} port_int=$(env|sed -n "s/PORT_\([0-9]*\)=$port/\1/p") # registartor use ServiceID that contains variables, which are now all available consul_service_id="${HOST%%.*}:${MESOS_CONTAINER_NAME}:${port_int}" curl -X PUT "http://${HOST}:8500/v1/agent/service/maintenance/${consul_service_id}?enable=true" # if you use udp uncomment also the udp to switch into maintenance mode #curl -X PUT "http://${HOST}:8500/v1/agent/service/maintenance/${consul_service_id}:udp?enable=true" done }
trap 'maintenance && sleep 2 && kill -TERM $PID $PID_CUSTOM' TERM INT
6. BUT do not run it , run that small part instead inside container:for port in $(sed 's/,/ /g'<<<${PORTS}) do portint=$(env|sed -n "s/PORT([0-9])=$port/\1/p") consul_service_id="${HOST%%.}:${MESOS_CONTAINER_NAME}:${port_int}" echo curl -X PUT "http://${HOST}:8500/v1/agent/service/maintenance/${consul_service_id}?enable=true" done
You should see sth like this:7. run this curl few times with `enable=true` or `enable=false` and verify if service is going to maintenance mode and back or not - it should be orange in consul and green when back.
- If not verify your DNS if `$HOST` (`your_host`) from the curl above is resolvable inside container!
Thats very important!
8. If all fine, the trap is ready and will catch KILL signal and deregister the service (put into maintenance mode) before it is being killed - so it will be taken out from load balance first.
9. You can play now with scale up and down, and test while true; do curl -H 'Host: python-smooth.service.consul' http://
should always gives you back something - without 503
Please try and if you have any questions just ask!
cookandy
Hello,
I have a simple node application deployed via marathon. I am trying to find a way to gracefully shut down the application so that no open connections are disconnected. I see @sielaq has posted some info here: https://github.com/mesosphere/marathon/issues/712
Is there any way you could describe in a bit more detail how you are handling this situation? It appears you are using a wrapper script and some extra mesos slave arguments. Is this correct?