inits.cloud

Consul Service Discovery

Sets up HashiCorp Consul for service discovery and configuration

Script Author

Rowan de Haas's avatar
Rowan de Haas
Script Author

Script Details

Created 10 months ago
Size 2 KB

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#cloud-config
package_update: true
package_upgrade: true

packages:
  - wget
  - unzip
  - curl

users:
  - name: consul
    system: true
    shell: /bin/false
    home: /opt/consul

write_files:
  - path: /etc/consul.d/consul.json
    content: |
      {
        "datacenter": "dc1",
        "data_dir": "/opt/consul/data",
        "log_level": "INFO",
        "server": true,
        "bind_addr": "0.0.0.0",
        "client_addr": "0.0.0.0",
        "retry_join": ["127.0.0.1"],
        "ui_config": {
          "enabled": true
        },
        "connect": {
          "enabled": true
        },
        "ports": {
          "grpc": 8502
        },
        "bootstrap_expect": 1
      }
    permissions: '0640'
    owner: consul:consul

  - path: /etc/systemd/system/consul.service
    content: |
      [Unit]
      Description=Consul
      Documentation=https://www.consul.io/
      Requires=network-online.target
      After=network-online.target
      ConditionFileNotEmpty=/etc/consul.d/consul.json

      [Service]
      Type=notify
      User=consul
      Group=consul
      ExecStart=/usr/local/bin/consul agent -config-dir=/etc/consul.d/
      ExecReload=/bin/kill -HUP $MAINPID
      KillMode=process
      Restart=on-failure
      LimitNOFILE=65536

      [Install]
      WantedBy=multi-user.target

runcmd:
  # Download and install Consul
  - cd /tmp
  - wget https://releases.hashicorp.com/consul/1.16.0/consul_1.16.0_linux_amd64.zip
  - unzip consul_1.16.0_linux_amd64.zip
  - mv consul /usr/local/bin/
  - chmod +x /usr/local/bin/consul
  # Create directories
  - mkdir -p /opt/consul/data
  - mkdir -p /etc/consul.d
  - chown -R consul:consul /opt/consul /etc/consul.d
  # Enable and start Consul
  - systemctl enable consul
  - systemctl start consul
  # Configure firewall
  - ufw allow 8300:8302/tcp
  - ufw allow 8500/tcp
  - ufw allow 8600/tcp
  - ufw allow 8600/udp

How to Use This Script

Cloud Provider Examples

Amazon EC2

aws ec2 run-instances
  --image-id ami-12345678
  --instance-type t3.micro
  --user-data file://script.yaml

DigitalOcean

doctl compute droplet create
  --image ubuntu-22-04-x64
  --size s-1vcpu-1gb
  --user-data-file script.yaml
  my-droplet

Google Cloud

gcloud compute instances create
  my-instance
  --metadata-from-file
  user-data=script.yaml