How to install and run Dynmap in docker container

[Peterkal2112]

Hello,
I want to use plugin Dynmap with this docker container Minecraft server.
Do you, someone, know how to install it and what i need for it ??
sincerely,

[KS-HTK]

Requirements:

• Database (MySQL/MariaDB) I've only used MySQL though.
• Webserver
  These could be run in docker container aswell.
  The Mapfiles on the Webserver can get qute large so a bit of storage is required.

The config file of dynmap explains the process quite well.
Basically copy the web folder to the webserver and configure both the webfiles and plugin to use the same database.

A detailed Tutorial can be found here. Though I have not actually used it. So I dont know how good the tutorial is.
webbukkit/dynmap#2609

[JurgenKuyper]

can't you just forward port 8123 through the container and it should work?

[KS-HTK]

Good Point. Haddn't tried that as my goal originally was to run Dynmap on a different Server altogether.
But yes, exposing that port should work aswell.

[MaxLevs]

But what if you have a bunch of servers with dynmap installed on every single one of them and you don't want to deal with all this ports?
That's the situation where you need a single entrypoint for all requests. Maybe you will just forward connection between servers' dynmap http-servers or maybe at this point you already want to have a dedicated frontend app to load all tiles yourself. And you can disigne it as you want too

[willis936]

I'm trying to solve this too. I can get port 8123 out, but haven't gotten an nginx reverse proxy working yet. Regardless, I want to use fast-cgi/php-fpm sockets for dynmap so the dynmap can run even when the minecraft server is decomissioned. I've successfully done this for non-containerized minecraft servers. I haven't figured out what dynmap tries to reach out to, which is what needs to be connected via docker. Exposing ports 80, 443, and 9000 don't work. Port 9000 doesn't work because I'm using the php-fpm sock solution. If I switched to using port 9000 instead I'm sure it would work. Does anyone know how to get php-fpm sock shared with a docker container?

I made a reddit post asking about this when I should have been sleeping after going at it for 10 hours.

https://reddit.com/r/admincraft/comments/12bcjk6/dynmap_external_webserver_on_a_112_itzg_docker/

[willis936]

My understanding is that there is no socket connection needed for external webserver, just the ability to write json files in the web directory.

When I shell into the docker container I can manually write files to the mounted web directory without issue, but the minecraft console says "permission denied" when trying to write json files. When using the internal webserver it has no issue writing image files to the same mounted web directory, so I'm not sure why there is a permission issue.

[willis936]

The /data volume shows ownership of "minecraft" from within the container while the /web volume I added for dynmap shows ownership of "root". I'm pretty sure this is the source of the headache. I just need to figure out how to properly convey write permissions of the /web volume to the "minecraft" user that is running java.

[willis936]

Got it working. The answer was running chown -R 1000:1000 on the host web directory. I checked uid by running cat /etc/passwd from within the container.

https://stackoverflow.com/questions/39397548/how-to-give-non-root-user-in-docker-container-access-to-a-volume-mounted-on-the

[trevoedwards]

Got it working. The answer was running chown -R 1000:1000 on the host web directory. I checked uid by running cat /etc/passwd from within the container.

https://stackoverflow.com/questions/39397548/how-to-give-non-root-user-in-docker-container-access-to-a-volume-mounted-on-the

Are you using docker-compose? If so, any chance you could share what your compose file looks like?

[willis936]

version: '3.8'

services:
  mc:
    image: itzg/minecraft-server:${IMAGE_TAG:-java8-jdk}
    environment:
      TYPE: "FORGE"
      VERSION: "1.12.2"
      FORGE_VERSION: "14.23.5.2860"
      JVM_DD_OPTS: "fml.queryResult:confirm"
      MOTD: "GCP 1.6.3 Server"
      SERVER_NAME: "GCP 1.6.3 Server"
      EULA: "true"
      INIT_MEMORY: "1G"
      MAX_MEMORY: "4G"
      TZ: "America/New_York"
      OPS: "[REDACTED]"
      WHITE_LIST_USERS: "[REDACTED]"
      DIFFICULTY: "peaceful"
      LEVEL_TYPE: "default"
      SEED: 1491928322975805150
      MAX_WORLD_SIZE: 4096
      MAX_PLAYERS: 10
      GUI: "false"
      ONLINE_MODE: "true"
      ENABLE_WHITE_LIST: "true"
      ALLOW_FLIGHT: "true"
      SIMULATION_DISTANCE: 12
      VIEW_DISTANCE: 12
      PLAYER_IDLE_TIMEOUT: 0
      SYNC_CHUNK_WRITES: "false"
      ENABLE_JMX: "false"
      USE_NATIVE_TRANSPORT: "true"
      USE_AIKAR_FLAGS: "true"
      SNOOPER_ENABLED: "false"
    ports:
      - "25565:25565"
    volumes:
      - /mnt/ram/gcp:/data
      - /var/www/html/dynmapgcp:/web
    stdin_open: true
    tty: true
    restart: unless-stopped

[DrBlackross]

Ok, i use portainer... sooo
in the minecraft server console type save-all, and then stop... (itll save the world and then stop the server)
then i just forwarded the port....

in portainer click on your minecraft server, click on duplicate/edit

THEN, next page...
uncheck the "Always pull the image" slider (grey it out from blue),
next to "Manual network port publishing" click the grey box that says "publish a new network port"
add dynmap ports 8123 etc (like in screenshot),
then click "Deploy the Container"

it'll redeploy the container without losing your world data, and any chunks that dynmap has rendered already and start the server back up... then your back on rcon or console in game or docker attached session