Hi! I noticed that my containerized Java app is not able to solve the domain names of other containers, while other processes spawned in the same container can. I am running a fairly basic compose file with few services in Swarm mode. Also I noticed that the /etc/hosts file has no container entries, which leads me to believe that the domain names resolution is handled by the overlay DNS (I am new to docker and containerization ^^"). I looked around on Google and I noticed few had the same problem but never offered a solution that works in Swarm mode. Any ideas?
EDIT: I’ve rebooted my Raspberry Pi cluster, rmed and deployed again and now seems to work 
. This seems odd…
Docker info:
Client: Docker Engine - Community
Version: 19.03.11
API version: 1.40
Go version: go1.13.10
Git commit: 42e35e6
Built: Mon Jun 1 09:13:07 2020
OS/Arch: linux/arm64
Experimental: false
Server: Docker Engine - Community
Engine:
Version: 19.03.11
API version: 1.40 (minimum version 1.12)
Go version: go1.13.10
Git commit: 42e35e6
Built: Mon Jun 1 09:11:40 2020
OS/Arch: linux/arm64
Experimental: false
containerd:
Version: 1.2.13
GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429
runc:
Version: 1.0.0-rc10
GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd
docker-init:
Version: 0.18.0
GitCommit: fec3683