Docker 1.13 DNS A-Record Lookup works with services but not with stack deploy
i have a problem with docker stack deploy with an application that makes DNS-A-Record lookup for cadvisor-instances running on the different docker hosts.
while it worked just fine when starting the services separately
docker service create --network=custom_monitoring \ --mode global --name cadvisor \ --mount type=bind,source=/,target=/rootfs,readonly=true \ --mount type=bind,source=/var/run,target=/var/run,readonly=false \ --mount type=bind,source=/sys,target=/sys,readonly=true \ --mount type=bind,source=/var/lib/docker/,target=/var/lib/docker,readonly=true google/cadvisor:latest
my application (is public on docker-hub)
docker service create --network=custom_monitoring \ --publish 8080:8080 -e JAVA_OPTS="-Xmx256m -Dtarget.dnsname=tasks.cadvisor" \ --name filter-proxy cproinger/sanalytics-filter-proxy
deploying the services with the yml-file below and this docker command however
docker stack deploy --compose-file myfile.yml mystack
does not work (one can test with http://:8080/metrics, the response is not important just the log-output from the filter-proxy is which states if it could look up something with the dns-name). the sanalytics-filter-proxy does not get any DNS-Entries when querying for the cadvisor service (i also tried the dns names cadvisor, mystack_cadvisor, tasks.mystack_cadvisor and another service that does not use global mode (because i have another issue with that Docker 1.13 stack deploy with global service malfunction (target replicas increase without limit)) but since the lookup does not work for other services that do not have such an issue the DNS lookup has an issue of its own).
version: "3" services: # monitoring services cadvisor: image: google/cadvisor:latest deploy: mode: global volumes: - /:/rootfs:ro - /var/run:/var:ro - /sys/sys:ro - /var/lib/docker:/var/lib/docker:ro networks: - app_overlay filter-proxy: image: cproinger/sanalytics-filter-proxy ports: - "8080:8080" networks: - app_overlay depends_on: - cadvisor - cep environment: - JAVA_OPTS=-Xmx256m -Dsanalytics.slice.label=com.docker.stack.namespace -Dtarget.dnsname=tasks.cadvisor networks: app_overlay:
any suggestions why this does not work? am i just using the wrong dns-name or should i file a bug?
i use docker 1.13 with experimental features switched on