I have a service deployed to my Docker Swarm Cluster as global service (ELK Metricbeat).
I want to each of this service to have a hostname the same as the hostname of the running node (host)?
in another word, how I can achieve the same result in the yml file such as:
docker run -h `hostname` elastic/metricbeat:5.4.1
this is my yml file:
metricbeat:
image: elastic/metricbeat:5.4.1
command: metricbeat -e -c /etc/metricbeat/metricbeat.yml -system.hostfs=/hostfs
hostname: '`hostname`'
volumes:
- /proc:/hostfs/proc:ro
- /sys/fs/cgroup:/hostfs/sys/fs/cgroup:ro
- /:/hostfs:ro
- /var/run/docker.sock:/var/run/docker.sock
networks:
- net
user: root
deploy:
mode: global
I have tried:
hostname: '`hostname`'
hostname: '${hostname}'
but no success.
Any solution?
Thank you in advance.
For anyone coming here :
services:
myservice:
hostname: "{{.Node.Hostname}}-{{.Service.Name}}"
No need to alter entry point ( at least on swarm on deploy )
I resolved the issue by mounting the host hostname file under /etc/nodehostname
and changing the service container to use an entrypoint that read the file and replace a variable (name) in metricbeat.yml
docker-entrypoint.sh
export NODE_HOSTNAME=$(eval cat /etc/nodehostname)
envsubst '$NODE_HOSTNAME' </etc/metricbeat/metricbeat.yml.tpl > /etc/metricbeat/metricbeat.yml
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