Generate cloud-init user data configuration

You can generate user data configuration for cloud-init as described in Generate user data. Alternatively, use the decapod-admin.

To generate user data configuration using the decapod-admin tool, run decapod-admin cloud-config [OPTIONS] PUBLIC_URL specifying the URL accessible by Ceph nodes. For all available options, run decapod-admin cloud-config --help.

Example:

root@7252bfd5947d:/# decapod-admin cloud-config http://10.0.0.10:9999
#cloud-config
packages: [python]
runcmd:
- [echo, === START DECAPOD SERVER DISCOVERY ===]
- [sh, -xc, 'grep -q ''/usr/share/server_discovery.sh'' /etc/rc.local || \
sed -i ''s?^exit 0?/usr/share/server_discovery.sh >> /var/log/\
server_discovery.log 2>\&1\nexit 0?'' /etc/rc.local']
- [sh, -xc, systemctl enable rc-local.service || true]
- [sh, -xc, /usr/share/server_discovery.sh 2>&1 | tee -a /var/log/\
server_discovery.log]
- [echo, === FINISH DECAPOD SERVER DISCOVERY ===]
users:
- groups: [sudo]
  name: ansible
  shell: /bin/bash
  ssh-authorized-keys: [ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAACAQC7K9bHPrSu5V\
  HnUOis2Uwc822fMyPTtwjfOkzNi/\
  oVOxmd1QE3DilrO5fJ33pRwEj7r1DfTlJmZWs8XwWaaUXkQ+iyfRPtgt/Ox+X5A/XaLdi/\
  yz7UjnHc8ERDUT/z73RzDwf21KNQOopGRuyhe+gvGZ5mhYDz3bnnYY9IRBNYaGw4bjS0q1\
  AbkPa1PvCo7P5b5UuRjhi4H74zCFkQD4evQsrQOcgev5GimnODqMntU0jnI/eEJwnnd1TcY\
  G7dS6FqMWpFX1gqcKjFIuqNTZLYzJu9U8mxxKmGOQSI6KWfP0etBw1YRHRIfdZmdaqSKHh0\
  ZhUUHjbf8Hb5Vqv1Fkzf0cGPbfrazEDI5FaVjkZMGFfdgs1be6xO7NHqzu1JJ3ZEur28o0A\
  QyOVvrEJIxQayDM0qyKi7B4+j6QDL0CDaWN3dUZO45il/KOm/eXCm4yQg0ImXHUmsDoW+6W\
  6akI/fSCAn8r9GK2QBBJPeTPA95WlOSXtICnrsqgb74yKPEsslzfrTUIiyoXBuuR9o5OoPX\
  ghKrazqcTeK/Vdl7w4nZ00O4jllHMTrS1xyubN0QeBd+3D8Hy2bN5h7WjiJsZ2XhlKR0Z1i5\
  AbgCR9hfQl84aFIXRARz+6uuDDHe2ONXujcS9jhuN7SOLGckiaXNfAeAsbEkYZytnUgdoxbHYSfzw==]
  sudo: ['ALL=(ALL) NOPASSWD:ALL']
write_files:
- content: |
    #-*- coding: utf-8 -*-

    from __future__ import print_function

    import json
    import ssl
    import sys

    try:
        import urllib.request as urllib2
    except ImportError:
        import urllib2

    data = {
        "username": 'ansible',
        "host": sys.argv[1].lower().strip(),
        "id": sys.argv[2].lower().strip()
    }
    headers = {
        "Content-Type": "application/json",
        "Authorization": '26758c32-3421-4f3d-9603-e4b5337e7ecc',
        "User-Agent": "cloud-init server discovery"
    }

    def get_response(url, data=None):
        if data is not None:
            data = json.dumps(data).encode("utf-8")
        request = urllib2.Request(url, data=data, headers=headers)
        request_kwargs = {"timeout": 20}
        if sys.version_info >= (2, 7, 9):
            ctx = ssl.create_default_context()
            ctx.check_hostname = False
            ctx.verify_mode = ssl.CERT_NONE
            request_kwargs["context"] = ctx
        try:
            return urllib2.urlopen(request, **request_kwargs).read()
        except Exception as exc:
            print("Cannot request {0}: {1}".format(url, exc))

    metadata_ip = get_response('http://169.254.169.254/latest/meta-data/public-ipv4')
    if metadata_ip is not None:
        data["host"] = metadata_ip
        print("Use IP {0} discovered from metadata API".format(metadata_ip))

    response = get_response('http://10.0.0.10:9999', data)
    if response is None:
        sys.exit("Server discovery failed.")
    print("Server discovery completed.")
  path: /usr/share/server_discovery.py
  permissions: '0440'
- content: |
    #!/bin/bash
    set -xe -o pipefail

    echo "Date $(date) | $(date -u) | $(date '+%s')"

    main() {
        local ip="$(get_local_ip)"
        local hostid="$(get_local_hostid)"

        python /usr/share/server_discovery.py "$ip" "$hostid"
    }

    get_local_ip() {
        local remote_ipaddr="$(getent ahostsv4 "10.0.0.10" | head -n 1 | cut -f 1 -d ' ')"

        ip route get "$remote_ipaddr" | head -n 1 | rev | cut -d ' ' -f 2 | rev
    }

    get_local_hostid() {
        dmidecode | grep UUID | rev | cut -d ' ' -f 1 | rev
    }

    main
  path: /usr/share/server_discovery.sh
  permissions: '0550'