Unhealthy Container

[Janilom]

I am able to connect to the Waterfall proxy and the two servers connected to it. However I started getting an Unhealthy Container notification.

failed to ping localhost:25577 : json: cannot unmarshal number -1 into Go struct field Version.version.protocol of type uint

[itzg]

I'll have to investigate that further, but for the time being you can disable the health check as described here

https://github.com/compose-spec/compose-spec/blob/master/spec.md#healthcheck

[itzg]

So far I haven't able to recreate this issue. Using this compose file

https://github.com/itzg/docker-bungeecord/blob/master/docs/docker-compose-waterfall.yml

I see the health reported as

{
  "Status": "healthy",
  "FailingStreak": 0,
  "Log": [
    {
      "Start": "2021-01-08T02:10:40.5938785Z",
      "End": "2021-01-08T02:10:41.5267142Z",
      "ExitCode": 0,
      "Output": "localhost:25577 : version=Waterfall 1.8.x, 1.9.x, 1.10.x, 1.11.x, 1.12.x, 1.13.x, 1.14.x, 1.15.x, 1.16.x online=0 max=1 motd=''"
    }
  ]
}

May also want to compare with the config I'm using:

https://github.com/itzg/docker-bungeecord/blob/master/docs/config.yml

[Janilom]

It may be a plugin causing it. I had started adding them when the issue started, I'll remove them and test it without.

I'm not sure if I can ask some other questions here or if I should stay on the original topic but I'm working with dynmap plugin and I would like to add it to a MySQL db by just having the info in my compose file but I am having trouble getting the plugin to connect to the DB. The plugin is in one of the worlds that is setup in the bungeecord compose file.

db:
environment:
- MYSQL_USER=minecraft
- MYSQL_ROOT_PASSWORD=password
- MYSQL_PASSWORD=password
- MYSQL_DATABASE=MCdb

bungeecord
- DB_USER=minecraft
- DB_HOST=localhost:3365
- DB_PORT=3365
- DB_NAME=MCdb
- DB_PASSWORD=password

plugin config
type: mysql
hostname: localhost
port: 3365
database: MCdb
userid: minecraft
password: password

[itzg]

Feel free to post here if you identify which plugin it is, since that'll help others that come across this issue.

As for the other question: change "localhost" in the DB_HOST to point at your "db" service by using "db:3365". localhost/127.0.0.1 within a container is namespaced to only be useful within the container (or pods in kubernetes).

[Janilom]

Okay I have compose files configured properly. Do the config files in the plugins need to point to the same compose information or should they have the default localhost:3306 and just add the userid/password?

[itzg]

They all need to be changed since "db" is the hostname of your MySQL container. In Docker you pretty much want to treat "localhost" as being useless.

The rcon tool I provide is a notable exception since it hits the Minecraft server at localhost since you exec it within the container and therefore within same networking namespace.

[Janilom]

The plugin that was causing the issue was AdvancedNMotd. I noticed that the player count was not showing properly on the Minecraft server selection screen so I checked their documentation to see what the issue was.

The solution was to open the AdvancedNMotd plugin config.yml and change the "Version: true" to false.

As for my database issue, I am able to use the db for permissions with LuckPerms without changing anything else. I cannot however get dynmap or other plugins that have their own configuration files to use the database. Not sure what I am doing wrong but they just won't connect to it.

[itzg]

As for my database issue, I am able to use the db for permissions with LuckPerms without changing anything else. I cannot however get dynmap or other plugins that have their own configuration files to use the database. Not sure what I am doing wrong but they just won't connect to it.

What logs, if any, do they provide when failing to connect?

[github-actions]

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[SinanAkkoyun]

Hi, I encounter the same issue.
Failure count of 1457 after an uptime of 12h. I host a server with around 50 players
This is the error it shows:
failed to ping localhost:25577 : could not connect to Minecraft server: dial tcp 127.0.0.1:25577: connect: connection refused

# Proxy
  mc-proxy:
    image: itzg/bungeecord
    ports:
      - 25565:25577
    restart: always
    tty: true
    stdin_open: true
    environment:
      TYPE: WATERFALL
      MEMORY: "2G"
      MAX_MEMORY: "8G"
      REPLACE_ENV_VARIABLES: "TRUE"
      ENV_VARIABLE_PREFIX: "CFG_"
      CFG_DB_HOST: "db-proxy"
      CFG_DB_NAME: "proxy"
      CFG_DB_USERNAME: "proxy"
      CFG_DB_PASSWORD: "${DB_PROXY_PASSWORD}"
    volumes:
      - "${MINECRAFT_PATH}/proxy/server:/server"

Does this health check refer to pinging the external port forward? Because it pings localhost:25577 and not mc-proxy:25577, it shall ultimately ping localhost:25565 or mc-proxy:25577

[twkonefal]

Sorry to necro this, but I'm getting the same error:

Nowhere in my configuration or plugins do I have port 25577 defined or referenced. Yet, here it is:

"Health": {
                "Status": "unhealthy",
                "FailingStreak": 48,
                "Log": [
                    {
                        "Start": "2025-02-19T11:42:12.833301119-08:00",
                        "End": "2025-02-19T11:42:12.871737149-08:00",
                        "ExitCode": 1,
                        "Output": "failed to ping localhost:25577 : could not connect to Minecraft server: dial tcp [::1]:25577: connect: connection refused"
                    },
                    {
                        "Start": "2025-02-19T11:42:42.872481615-08:00",
                        "End": "2025-02-19T11:42:42.911858297-08:00",
                        "ExitCode": 1,
                        "Output": "failed to ping localhost:25577 : could not connect to Minecraft server: dial tcp [::1]:25577: connect: connection refused"
                    },
                    {
                        "Start": "2025-02-19T11:43:12.912386477-08:00",
                        "End": "2025-02-19T11:43:12.949157173-08:00",
                        "ExitCode": 1,
                        "Output": "failed to ping localhost:25577 : could not connect to Minecraft server: dial tcp [::1]:25577: connect: connection refused"
                    },
                    {
                        "Start": "2025-02-19T11:43:42.950144356-08:00",
                        "End": "2025-02-19T11:43:42.993901539-08:00",
                        "ExitCode": 1,
                        "Output": "failed to ping localhost:25577 : could not connect to Minecraft server: dial tcp [::1]:25577: connect: connection refused"
                    },
                    {
                        "Start": "2025-02-19T11:44:12.99511295-08:00",
                        "End": "2025-02-19T11:44:13.042015506-08:00",
                        "ExitCode": 1,
                        "Output": "failed to ping localhost:25577 : could not connect to Minecraft server: dial tcp [::1]:25577: connect: connection refused"
                    }
                ]
            }

Here's the docker-compose.yml:

$ cat docker-compose.yml 
# https://github.com/itzg/docker-mc-proxy
services:
  velocity:
    restart: unless-stopped
    container_name: mc-velocity
    user: 1000:1002
    image: itzg/mc-proxy
    ports:
      - "25565:25565"
      - "25565:25565/udp"
    volumes:
      - /srv/mc/servers/velocity:/server
    environment:
      UID: 1000
      TYPE: VELOCITY
      #ICON:
      ENABLE_RCON: true
      REPLACE_ENV_VARIAGBLES: true
      #ENV_VARIABLE_PREFIX: "CFG_"
      #PLUGINS:

$ docker inspect mc-velocity ports
...
"NetworkSettings": {
            "Bridge": "",
            "SandboxID": "1db88dbf71f1440fc9ad48a2cae773b331b09ca948052ca6a011270178a150cd",
            "SandboxKey": "/var/run/docker/netns/1db88dbf71f1",
            "Ports": {
                "25565/tcp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "25565"
                    },
                    {
                        "HostIp": "::",
                        "HostPort": "25565"
                    }
                ],
                "25565/udp": [
                    {
                        "HostIp": "0.0.0.0",
                        "HostPort": "25565"
                    },
                    {
                        "HostIp": "::",
                        "HostPort": "25565"
                    }
                ],
                "25577/tcp": null
            },

Not sure where this last port (25577) is coming from.