如何停止/启动在 docker 中运行的 logstash 服务

Question

I'm trying to figure out how logstash works/run inside docker, and I'm stuck with simple thing like starting and stoping logstash.

I have started logstash docker container with simple run

docker run -it --name l2 logstash

and with result:

 [Api Webserver] INFO  logstash.agent - Successfully started Logstash API endpoint {:port=>9600}

Next thing is runing /bin/bash with exec command, to get inside running container.

docker exec -it l2 /bin/bash 
root@1b55d3a40d3f:/# 

Listing services status, shows that there is no logstash service running. Where can I find logstash service and stop/start?

root@1b55d3a40d3f:/# service --status-all 
 [ - ]  bootlogs
 [ - ]  bootmisc.sh
 [ - ]  checkfs.sh
 [ - ]  checkroot-bootclean.sh
 [ - ]  checkroot.sh
 [ - ]  dbus
 [ - ]  hostname.sh
 [ ? ]  hwclock.sh
 [ - ]  killprocs
 [ - ]  motd
 [ - ]  mountall-bootclean.sh
 [ - ]  mountall.sh
 [ - ]  mountdevsubfs.sh
 [ - ]  mountkernfs.sh
 [ - ]  mountnfs-bootclean.sh
 [ - ]  mountnfs.sh
 [ - ]  procps
 [ - ]  rc.local
 [ - ]  rmnologin
 [ - ]  sendsigs
 [ + ]  udev
 [ ? ]  udev-finish
 [ - ]  umountfs
 [ - ]  umountnfs.sh
 [ - ]  umountroot
 [ - ]  urandom
 [ - ]  x11-common

Answer 1

The logstash in the container is not run as a system service, the entrypoint in the image will start a process and will keep the container up until this process ends or fails.

If you do a docker top l2 it will show the logstash process running (probaly alone) in the container.

To stop the logstash, you need to stop the container with docker stop l2 , and later when you need to start it again you can run docker start l2 , it will work as long you set the containers name as 12 when you create or first run it.

Docker Start help: https://docs.docker.com/engine/reference/commandline/start/

Docker stop help: https://docs.docker.com/engine/reference/commandline/stop/

Docker create: https://docs.docker.com/engine/reference/commandline/create/