Nomad + Vault agent

nomad-vault.sh

#!/usr/bin/env bash

if [ -f /mnt/ramdisk/token ]; then
  exec env VAULT_TOKEN=$(vault unwrap -field=token $(jq -r '.token' /mnt/ramdisk/token)) \
    /usr/local/bin/nomad agent \
      -config=/etc/nomad.d \
      -vault-tls-skip-verify=true
else
  echo "Nomad service failed due to missing Vault token"
  exit 1
fi

nomad.service

[Unit]
Description=Nomad Agent
Requires=consul-online.target
After=consul-online.target

[Service]
KillMode=process
KillSignal=SIGINT
Environment=VAULT_ADDR=http://active.vault.service.consul:8200
Environment=VAULT_SKIP_VERIFY=true
ExecStartPre=/usr/local/bin/vault agent -config /etc/vault-agent.d/vault-agent.hcl
ExecStart=/usr/bin/nomad-vault.sh
ExecReload=/bin/kill -HUP $MAINPID
Restart=on-failure
RestartSec=2
StartLimitBurst=3
StartLimitIntervalSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

vault-agent.hcl

exit_after_auth = true
auto_auth {
  method "aws" {
    mount_path = "auth/aws"
    config     = {
      type     = "iam"
      role     = "nomad"
      }
  }
  sink "file" {
    wrap_ttl = "5m"
    config   = {
      path   = "/mnt/ramdisk/token"
    }
  }
}