docker - Dockerizing ambry -


hi im trying run ambry in docker

part of docker-compose.yml file: 

ambry:     build: resources/ambry

and dockerfile :

from alpine:latest  user root  run \   apk update && \   apk upgrade && \   apk add git && \   apk add bash && \   apk add openjdk8 && \   rm -rf /var/cache/apk/*  env java_home /usr/lib/jvm/java-1.8-openjdk  workdir /tmp  cmd ["sh"]  run git clone https://github.com/linkedin/ambry.git  workdir ambry  run ./gradlew alljar  workdir target  cmd mkdir logs  cmd java -dlog4j.configuration=file:../config/log4j.properties -jar ambry.jar --serverpropsfilepath ../config/server.properties --hardwarelayoutfilepath ../config/hardwarelayout.json --partitionlayoutfilepath ../config/partitionlayout.json > logs/server.log &  cmd java -dlog4j.configuration=file:../config/log4j.properties -cp "*" com.github.ambry.frontend.ambryfrontendmain --serverpropsfilepath ../config/frontend.properties --hardwarelayoutfilepath ../config/hardwarelayout.json --partitionlayoutfilepath ../config/partitionlayout.json > logs/frontend.log &

i doing commands in shell , taken https://github.com/linkedin/ambry. , works fine docker on start exit..:

dockerized_ambry_1 exited code 0

any 1 know why exists ?

https://docs.docker.com/engine/reference/builder/#cmd

there can 1 cmd instruction in dockerfile. if list more 1 cmd last cmd take effect.

looks cmd of yours runs "run java class com.github.ambry.frontend.ambryfrontendmain". launch background process (you specified &).

the container lifetime tied "launch background task", completes immediately. container exits immediately.

since container responsible launching two services (ambry.jar, com.github.ambry.frontend.ambryfrontendmain): want container lifetime tied both of those, , want sigterm sent container, elegantly shutdown both of those.

i recommend using init system start & end services. alpine linux typically uses openrc, iirc dockerized alpine linux not have init system, need find variant (or install yourself).

personally i've found it's non-trivial use init systems docker: common problem logs don't go container's stdout; until overcome that, can black box. luck!


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