failing to connect to an ipv6 application

Questions / Help
1

i’m trying to setup grafana promtail to receive logs from a remote system via syslog, but i’m running into an issue. i’ve allocated an ipv6 address, and deployed a simple app with the following configuration.

fly.toml:

app = "promtail"
kill_signal = "SIGINT"
kill_timeout = 5
processes = []

[build]
  dockerfile = "Dockerfile.promtail"

[env]

[[services]]
  internal_port = 1514
  protocol = "tcp"
  [[services.ports]]
    port = 1514

Dockerfile.promtail

FROM  grafana/promtail:2.8.4

COPY promtail-config.yaml /etc/promtail/config.yaml
CMD ["-config.file=/etc/promtail/config.yaml", "-config.expand-env=true"]

promtail-config.yaml

server:
  http_listen_port: 9080
  grpc_listen_port: 0

positions:
  filename: /tmp/positions.yaml

clients:
  - url: http://${LOKI_USERNAME}:${LOKI_PASSWORD}@${LOKI_HOST}:3100/loki/api/v1/push

scrape_configs:
  - job_name: syslog1
    syslog:
      listen_address: 0.0.0.0:1514
      labels:
        job: "syslog"
    relabel_configs:
      - source_labels: ['__syslog_message_hostname']
        target_label: 'host'

ssh’ing into the app, i see it’s listening on *:1514 as IPv6

-> flyctl ssh console -a promtail
root@9185700db73d38:/# lsof -nP -iTCP -sTCP:LISTEN
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
promtail 255 root    7u  IPv6   6374      0t0  TCP *:1514 (LISTEN)
promtail 255 root    8u  IPv6   6375      0t0  TCP *:9080 (LISTEN)
promtail 255 root    9u  IPv6   6376      0t0  TCP *:45875 (LISTEN)
hallpass 256 root    6u  IPv6   6355      0t0  TCP [fdaa:2:6c61:a7b:162:3d14:776b:2]:22 (LISTEN)

but any attempt to reach it fails:

-> mtr $(fly ips list -j -a promtail | jq -r '.[] .Address')

mtr: udp socket connect failed: No route to host

-> nc -v6 $(fly ips list -j -a promtail | jq -r '.[] .Address') 1514

nc: connectx to 2a09:8280:1::42:63a8 port 1514 (tcp) failed: No route to host

i thought leaving off the handlers in the fly toml would just be a pass through. is there something else i’m missing?

2

upon further investigation, this appears to be specifically an ipv6 networking issue. since i allocated an ipv6 address and deployed the app, shouldn’t it be routable right away?

3

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