344 lines
12 KiB
Python
344 lines
12 KiB
Python
#!/usr/bin/python3
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Usage: inventory.py ip1 [ip2 ...]
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# Examples: inventory.py 10.10.1.3 10.10.1.4 10.10.1.5
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#
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# Advanced usage:
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# Add another host after initial creation: inventory.py 10.10.1.5
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# Delete a host: inventory.py -10.10.1.3
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# Delete a host by id: inventory.py -node1
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#
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# Load a YAML or JSON file with inventory data: inventory.py load hosts.yaml
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# YAML file should be in the following format:
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# group1:
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# host1:
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# ip: X.X.X.X
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# var: val
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# group2:
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# host2:
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# ip: X.X.X.X
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from collections import OrderedDict
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try:
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import configparser
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except ImportError:
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import ConfigParser as configparser
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import os
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import re
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import sys
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ROLES = ['all', 'kube-master', 'kube-node', 'etcd', 'k8s-cluster:children',
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'calico-rr']
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PROTECTED_NAMES = ROLES
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AVAILABLE_COMMANDS = ['help', 'print_cfg', 'print_ips', 'load']
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_boolean_states = {'1': True, 'yes': True, 'true': True, 'on': True,
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'0': False, 'no': False, 'false': False, 'off': False}
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def get_var_as_bool(name, default):
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value = os.environ.get(name, '')
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return _boolean_states.get(value.lower(), default)
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# Configurable as shell vars start
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CONFIG_FILE = os.environ.get("CONFIG_FILE", "./inventory.cfg")
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# Reconfigures cluster distribution at scale
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SCALE_THRESHOLD = int(os.environ.get("SCALE_THRESHOLD", 50))
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MASSIVE_SCALE_THRESHOLD = int(os.environ.get("SCALE_THRESHOLD", 200))
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DEBUG = get_var_as_bool("DEBUG", True)
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HOST_PREFIX = os.environ.get("HOST_PREFIX", "node")
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# Configurable as shell vars end
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class KubesprayInventory(object):
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def __init__(self, changed_hosts=None, config_file=None):
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self.config = configparser.ConfigParser(allow_no_value=True,
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delimiters=('\t', ' '))
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self.config_file = config_file
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if self.config_file:
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self.config.read(self.config_file)
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if changed_hosts and changed_hosts[0] in AVAILABLE_COMMANDS:
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self.parse_command(changed_hosts[0], changed_hosts[1:])
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sys.exit(0)
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self.ensure_required_groups(ROLES)
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if changed_hosts:
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self.hosts = self.build_hostnames(changed_hosts)
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self.purge_invalid_hosts(self.hosts.keys(), PROTECTED_NAMES)
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self.set_all(self.hosts)
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self.set_k8s_cluster()
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self.set_etcd(list(self.hosts.keys())[:3])
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if len(self.hosts) >= SCALE_THRESHOLD:
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self.set_kube_master(list(self.hosts.keys())[3:5])
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else:
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self.set_kube_master(list(self.hosts.keys())[:2])
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self.set_kube_node(self.hosts.keys())
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if len(self.hosts) >= SCALE_THRESHOLD:
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self.set_calico_rr(list(self.hosts.keys())[:3])
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else: # Show help if no options
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self.show_help()
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sys.exit(0)
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self.write_config(self.config_file)
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def write_config(self, config_file):
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if config_file:
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with open(config_file, 'w') as f:
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self.config.write(f)
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else:
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print("WARNING: Unable to save config. Make sure you set "
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"CONFIG_FILE env var.")
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def debug(self, msg):
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if DEBUG:
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print("DEBUG: {0}".format(msg))
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def get_ip_from_opts(self, optstring):
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opts = optstring.split(' ')
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for opt in opts:
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if '=' not in opt:
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continue
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k, v = opt.split('=')
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if k == "ip":
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return v
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raise ValueError("IP parameter not found in options")
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def ensure_required_groups(self, groups):
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for group in groups:
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try:
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self.debug("Adding group {0}".format(group))
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self.config.add_section(group)
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except configparser.DuplicateSectionError:
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pass
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def get_host_id(self, host):
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'''Returns integer host ID (without padding) from a given hostname.'''
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try:
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short_hostname = host.split('.')[0]
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return int(re.findall("\d+$", short_hostname)[-1])
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except IndexError:
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raise ValueError("Host name must end in an integer")
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def build_hostnames(self, changed_hosts):
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existing_hosts = OrderedDict()
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highest_host_id = 0
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try:
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for host, opts in self.config.items('all'):
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existing_hosts[host] = opts
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host_id = self.get_host_id(host)
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if host_id > highest_host_id:
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highest_host_id = host_id
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except configparser.NoSectionError:
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pass
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# FIXME(mattymo): Fix condition where delete then add reuses highest id
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next_host_id = highest_host_id + 1
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all_hosts = existing_hosts.copy()
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for host in changed_hosts:
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if host[0] == "-":
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realhost = host[1:]
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if self.exists_hostname(all_hosts, realhost):
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self.debug("Marked {0} for deletion.".format(realhost))
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all_hosts.pop(realhost)
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elif self.exists_ip(all_hosts, realhost):
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self.debug("Marked {0} for deletion.".format(realhost))
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self.delete_host_by_ip(all_hosts, realhost)
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elif host[0].isdigit():
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if self.exists_hostname(all_hosts, host):
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self.debug("Skipping existing host {0}.".format(host))
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continue
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elif self.exists_ip(all_hosts, host):
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self.debug("Skipping existing host {0}.".format(host))
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continue
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next_host = "{0}{1}".format(HOST_PREFIX, next_host_id)
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next_host_id += 1
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all_hosts[next_host] = "ansible_host={0} ip={1}".format(
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host, host)
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elif host[0].isalpha():
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raise Exception("Adding hosts by hostname is not supported.")
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return all_hosts
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def exists_hostname(self, existing_hosts, hostname):
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return hostname in existing_hosts.keys()
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def exists_ip(self, existing_hosts, ip):
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for host_opts in existing_hosts.values():
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if ip == self.get_ip_from_opts(host_opts):
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return True
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return False
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def delete_host_by_ip(self, existing_hosts, ip):
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for hostname, host_opts in existing_hosts.items():
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if ip == self.get_ip_from_opts(host_opts):
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del existing_hosts[hostname]
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return
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raise ValueError("Unable to find host by IP: {0}".format(ip))
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def purge_invalid_hosts(self, hostnames, protected_names=[]):
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for role in self.config.sections():
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for host, _ in self.config.items(role):
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if host not in hostnames and host not in protected_names:
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self.debug("Host {0} removed from role {1}".format(host,
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role))
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self.config.remove_option(role, host)
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def add_host_to_group(self, group, host, opts=""):
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self.debug("adding host {0} to group {1}".format(host, group))
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self.config.set(group, host, opts)
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def set_kube_master(self, hosts):
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for host in hosts:
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self.add_host_to_group('kube-master', host)
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def set_all(self, hosts):
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for host, opts in hosts.items():
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self.add_host_to_group('all', host, opts)
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def set_k8s_cluster(self):
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self.add_host_to_group('k8s-cluster:children', 'kube-node')
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self.add_host_to_group('k8s-cluster:children', 'kube-master')
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def set_calico_rr(self, hosts):
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for host in hosts:
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if host in self.config.items('kube-master'):
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self.debug("Not adding {0} to calico-rr group because it "
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"conflicts with kube-master group".format(host))
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continue
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if host in self.config.items('kube-node'):
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self.debug("Not adding {0} to calico-rr group because it "
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"conflicts with kube-node group".format(host))
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continue
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self.add_host_to_group('calico-rr', host)
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def set_kube_node(self, hosts):
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for host in hosts:
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if len(self.config['all']) >= SCALE_THRESHOLD:
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if self.config.has_option('etcd', host):
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self.debug("Not adding {0} to kube-node group because of "
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"scale deployment and host is in etcd "
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"group.".format(host))
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continue
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if len(self.config['all']) >= MASSIVE_SCALE_THRESHOLD:
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if self.config.has_option('kube-master', host):
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self.debug("Not adding {0} to kube-node group because of "
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"scale deployment and host is in kube-master "
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"group.".format(host))
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continue
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self.add_host_to_group('kube-node', host)
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def set_etcd(self, hosts):
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for host in hosts:
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self.add_host_to_group('etcd', host)
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def load_file(self, files=None):
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'''Directly loads JSON, or YAML file to inventory.'''
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if not files:
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raise Exception("No input file specified.")
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import json
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import yaml
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for filename in list(files):
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# Try JSON, then YAML
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try:
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with open(filename, 'r') as f:
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data = json.load(f)
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except ValueError:
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try:
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with open(filename, 'r') as f:
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data = yaml.load(f)
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print("yaml")
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except ValueError:
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raise Exception("Cannot read %s as JSON, YAML, or CSV",
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filename)
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self.ensure_required_groups(ROLES)
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self.set_k8s_cluster()
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for group, hosts in data.items():
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self.ensure_required_groups([group])
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for host, opts in hosts.items():
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optstring = "ansible_host={0} ip={0}".format(opts['ip'])
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for key, val in opts.items():
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if key == "ip":
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continue
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optstring += " {0}={1}".format(key, val)
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self.add_host_to_group('all', host, optstring)
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self.add_host_to_group(group, host)
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self.write_config(self.config_file)
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def parse_command(self, command, args=None):
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if command == 'help':
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self.show_help()
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elif command == 'print_cfg':
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self.print_config()
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elif command == 'print_ips':
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self.print_ips()
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elif command == 'load':
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self.load_file(args)
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else:
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raise Exception("Invalid command specified.")
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def show_help(self):
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help_text = '''Usage: inventory.py ip1 [ip2 ...]
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Examples: inventory.py 10.10.1.3 10.10.1.4 10.10.1.5
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Available commands:
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help - Display this message
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print_cfg - Write inventory file to stdout
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print_ips - Write a space-delimited list of IPs from "all" group
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Advanced usage:
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Add another host after initial creation: inventory.py 10.10.1.5
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Delete a host: inventory.py -10.10.1.3
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Delete a host by id: inventory.py -node1
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Configurable env vars:
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DEBUG Enable debug printing. Default: True
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CONFIG_FILE File to write config to Default: ./inventory.cfg
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HOST_PREFIX Host prefix for generated hosts. Default: node
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SCALE_THRESHOLD Separate ETCD role if # of nodes >= 50
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MASSIVE_SCALE_THRESHOLD Separate K8s master and ETCD if # of nodes >= 200
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'''
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print(help_text)
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def print_config(self):
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self.config.write(sys.stdout)
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def print_ips(self):
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ips = []
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for host, opts in self.config.items('all'):
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ips.append(self.get_ip_from_opts(opts))
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print(' '.join(ips))
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def main(argv=None):
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if not argv:
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argv = sys.argv[1:]
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KubesprayInventory(argv, CONFIG_FILE)
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if __name__ == "__main__":
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sys.exit(main())
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