Nomad unable to launch on EC2 graviton instance types

[shoenig]

We go through the trouble of shipping a table of CPU performance data for EC2 types as of v0.11.2, so we should be able to launch here. It looks like the standard CPU fingerprinter causes an error on graviton (ARM) instances, because there is no MHz information available. (On AMD/Intel, data is available but meaningless and discarded).

ubuntu@ip-172-31-17-121:~$ curl -s http://169.254.169.254/latest/meta-data/instance-type
a1.medium

ubuntu@ip-172-31-17-121:~$ lscpu
Architecture:                    aarch64
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Little Endian
CPU(s):                          1
On-line CPU(s) list:             0
Thread(s) per core:              1
Core(s) per socket:              1
Socket(s):                       1
NUMA node(s):                    1
Vendor ID:                       ARM
Model:                           3
Model name:                      Cortex-A72
Stepping:                        r0p3
BogoMIPS:                        166.66
L1d cache:                       32 KiB
L1i cache:                       48 KiB
L2 cache:                        2 MiB
NUMA node0 CPU(s):               0
Vulnerability Itlb multihit:     Not affected
Vulnerability L1tf:              Not affected
Vulnerability Mds:               Not affected
Vulnerability Meltdown:          Not affected
Vulnerability Spec store bypass: Not affected
Vulnerability Spectre v1:        Mitigation; __user pointer sanitization
Vulnerability Spectre v2:        Mitigation; Branch predictor hardening
Vulnerability Tsx async abort:   Not affected
Flags:                           fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid

ubuntu@ip-172-31-17-121:~$ ./nomad version 
Nomad v0.11.2 (807cfebe90d56f9e5beec3e72936ebe86acc8ce3)

ubuntu@ip-172-31-17-121:~$ ./nomad agent -dev -log-level=TRACE
==> No configuration files loaded
==> Starting Nomad agent...
==> Error starting agent: client setup failed: fingerprinting failed: cannot detect cpu total compute. CPU compute must be set manually using the client config option "cpu_total_compute"
    2020-05-16T14:58:28.830Z [DEBUG] agent.plugin_loader.docker: using client connection initialized from environment: plugin_dir=
    2020-05-16T14:58:28.830Z [DEBUG] agent.plugin_loader.docker: using client connection initialized from environment: plugin_dir=
    2020-05-16T14:58:28.831Z [INFO]  agent: detected plugin: name=docker type=driver plugin_version=0.1.0
    2020-05-16T14:58:28.831Z [INFO]  agent: detected plugin: name=raw_exec type=driver plugin_version=0.1.0
    2020-05-16T14:58:28.831Z [INFO]  agent: detected plugin: name=exec type=driver plugin_version=0.1.0
    2020-05-16T14:58:28.831Z [INFO]  agent: detected plugin: name=qemu type=driver plugin_version=0.1.0
    2020-05-16T14:58:28.831Z [INFO]  agent: detected plugin: name=java type=driver plugin_version=0.1.0
    2020-05-16T14:58:28.831Z [INFO]  agent: detected plugin: name=nvidia-gpu type=device plugin_version=0.1.0
    2020-05-16T14:58:28.835Z [INFO]  nomad.raft: initial configuration: index=1 servers="[{Suffrage:Voter ID:127.0.0.1:4647 Address:127.0.0.1:4647}]"
    2020-05-16T14:58:28.836Z [INFO]  nomad: serf: EventMemberJoin: ip-172-31-17-121.global 127.0.0.1
    2020-05-16T14:58:28.836Z [INFO]  nomad: starting scheduling worker(s): num_workers=1 schedulers=[service, batch, system, _core]
    2020-05-16T14:58:28.836Z [INFO]  client: using state directory: state_dir=/tmp/NomadClient618123295
    2020-05-16T14:58:28.837Z [INFO]  client: using alloc directory: alloc_dir=/tmp/NomadClient800920818
    2020-05-16T14:58:28.842Z [DEBUG] client.fingerprint_mgr: built-in fingerprints: fingerprinters=[arch, cgroup, consul, cpu, host, memory, network, nomad, signal, storage, vault, env_aws, env_gce]
    2020-05-16T14:58:28.843Z [INFO]  client.fingerprint_mgr.cgroup: cgroups are available
    2020-05-16T14:58:28.843Z [INFO]  nomad.raft: entering follower state: follower="Node at 127.0.0.1:4647 [Follower]" leader=
    2020-05-16T14:58:28.843Z [INFO]  nomad: adding server: server="ip-172-31-17-121.global (Addr: 127.0.0.1:4647) (DC: dc1)"
    2020-05-16T14:58:28.843Z [DEBUG] client.fingerprint_mgr: fingerprinting periodically: fingerprinter=cgroup period=15s
    2020-05-16T14:58:28.844Z [DEBUG] client.fingerprint_mgr.cpu: detected core count: cores=1

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