WARN falling back to IMDSv1

Nomad
1

After updating Nomad from 1.8.3 to 1.9.5 I encountered a strange error preventing Nomad from starting:

Started Nomad.
Jan 20 14:24:35 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: ==> WARNING: mTLS is not configured - Nomad is not secure without mTLS!
Jan 20 14:24:35 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: ==> Loaded configuration from /etc/nomad.d/client.hcl, /etc/nomad.d/nomad.hcl
Jan 20 14:24:35 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: ==> Starting Nomad agent…
Jan 20 14:24:37 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: SDK 2025/01/20 14:24:37 WARN falling back to IMDSv1: operation error ec2imds: getToken, http respons>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: ==> Error starting agent: client setup failed: fingerprinting failed: operation error ec2imds: GetMe>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.001Z [WARN] agent.plugin_loader: skipping external plugins since plugin_dir>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] agent: detected plugin: name=exec type=driver plugin_version=0.>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] agent: detected plugin: name=qemu type=driver plugin_version=0.>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] agent: detected plugin: name=java type=driver plugin_version=0.>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] agent: detected plugin: name=docker type=driver plugin_version=>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] agent: detected plugin: name=raw_exec type=driver plugin_versio>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] client: using state directory: state_dir=/opt/nomad/data/client
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] client: using alloc directory: alloc_dir=/opt/nomad/data/alloc
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.004Z [INFO] client: using dynamic ports: min=20000 max=32000 reserved="22,8>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.016Z [INFO] client.fingerprint_mgr.consul: consul agent is available: clust>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.020Z [WARN] client.fingerprint_mgr.landlock: failed to fingerprint kernel l>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.024Z [WARN] client.fingerprint_mgr.network: unable to parse speed: path=/us>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.025Z [WARN] client.fingerprint_mgr.network: unable to parse speed: path=/us>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.029Z [WARN] client.fingerprint_mgr.network: unable to parse speed: path=/us>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:35.034Z [WARN] client.fingerprint_mgr.network: unable to parse speed: path=/us>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4393]: 2025-01-20T14:24:39.628Z [ERROR] agent: error starting agent: error="client setup failed: finger>
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud systemd[1]: nomad.service: Main process exited, code=exited, status=1/FAILURE
Jan 20 14:24:39 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud systemd[1]: nomad.service: Failed with result ‘exit-code’.

This happenend multiple times and suddenly the start worked:

Started Nomad.
Jan 20 14:24:59 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]: ==> WARNING: mTLS is not configured - Nomad is not secure without mTLS!
Jan 20 14:24:59 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]: ==> Loaded configuration from /etc/nomad.d/client.hcl, /etc/nomad.d/nomad.hcl
Jan 20 14:24:59 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]: ==> Starting Nomad agent...
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]: ==> Nomad agent configuration:
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]:        Advertise Addrs: HTTP: 10.23.12.13:4646
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]:             Bind Addrs: HTTP: [0.0.0.0:4646]
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]:                 Client: true
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]:              Log Level: INFO
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]:                 Region: global (DC: preprod)
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]:                 Server: false
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]:                Version: 1.9.5
Jan 20 14:25:05 preprod-nomad-client1.dc3-a.pub1.infomaniak.cloud nomad[4771]: ==> Nomad agent started! Log data will stream in below:

What is the error about, it seems AWS-related ( IMDSv1:), which is frightening me a bit since we have no dependency with AWS. Any ideas?

2

After some digging I saw that it was related with fingerprinting, disabling it resolved the issue.
But there seems to be an issue with AWS probably.

 options = {
    "fingerprint.denylist" = "env_aws,env_gce,env_azure,env_digitalocean"
  }