c96fa2f4fc
Also adds calico-rr group if there are standalone etcd nodes. Now if there are 50 or more nodes, 3 etcd nodes will be standalone. If there are 200 or more nodes, 2 kube-masters will be standalone. If thresholds are exceeded, kube-node group cannot add nodes that belong to etcd or kube-master groups (according to above statements).
343 lines
12 KiB
Python
343 lines
12 KiB
Python
#!/usr/bin/python3
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
|
|
# implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
#
|
|
# Usage: inventory.py ip1 [ip2 ...]
|
|
# Examples: inventory.py 10.10.1.3 10.10.1.4 10.10.1.5
|
|
#
|
|
# Advanced usage:
|
|
# Add another host after initial creation: inventory.py 10.10.1.5
|
|
# Delete a host: inventory.py -10.10.1.3
|
|
# Delete a host by id: inventory.py -node1
|
|
#
|
|
# Load a YAML or JSON file with inventory data: inventory.py load hosts.yaml
|
|
# YAML file should be in the following format:
|
|
# group1:
|
|
# host1:
|
|
# ip: X.X.X.X
|
|
# var: val
|
|
# group2:
|
|
# host2:
|
|
# ip: X.X.X.X
|
|
|
|
from collections import OrderedDict
|
|
try:
|
|
import configparser
|
|
except ImportError:
|
|
import ConfigParser as configparser
|
|
|
|
import os
|
|
import re
|
|
import sys
|
|
|
|
ROLES = ['all', 'kube-master', 'kube-node', 'etcd', 'k8s-cluster:children',
|
|
'calico-rr']
|
|
PROTECTED_NAMES = ROLES
|
|
AVAILABLE_COMMANDS = ['help', 'print_cfg', 'print_ips', 'load']
|
|
_boolean_states = {'1': True, 'yes': True, 'true': True, 'on': True,
|
|
'0': False, 'no': False, 'false': False, 'off': False}
|
|
|
|
|
|
def get_var_as_bool(name, default):
|
|
value = os.environ.get(name, '')
|
|
return _boolean_states.get(value.lower(), default)
|
|
|
|
# Configurable as shell vars start
|
|
|
|
CONFIG_FILE = os.environ.get("CONFIG_FILE", "./inventory.cfg")
|
|
# Reconfigures cluster distribution at scale
|
|
SCALE_THRESHOLD = int(os.environ.get("SCALE_THRESHOLD", 50))
|
|
MASSIVE_SCALE_THRESHOLD = int(os.environ.get("SCALE_THRESHOLD", 200))
|
|
|
|
DEBUG = get_var_as_bool("DEBUG", True)
|
|
HOST_PREFIX = os.environ.get("HOST_PREFIX", "node")
|
|
|
|
# Configurable as shell vars end
|
|
|
|
|
|
class KargoInventory(object):
|
|
|
|
def __init__(self, changed_hosts=None, config_file=None):
|
|
self.config = configparser.ConfigParser(allow_no_value=True,
|
|
delimiters=('\t', ' '))
|
|
self.config_file = config_file
|
|
if self.config_file:
|
|
self.config.read(self.config_file)
|
|
|
|
if changed_hosts and changed_hosts[0] in AVAILABLE_COMMANDS:
|
|
self.parse_command(changed_hosts[0], changed_hosts[1:])
|
|
sys.exit(0)
|
|
|
|
self.ensure_required_groups(ROLES)
|
|
|
|
if changed_hosts:
|
|
self.hosts = self.build_hostnames(changed_hosts)
|
|
self.purge_invalid_hosts(self.hosts.keys(), PROTECTED_NAMES)
|
|
self.set_all(self.hosts)
|
|
self.set_k8s_cluster()
|
|
self.set_etcd(list(self.hosts.keys())[:3])
|
|
if len(self.hosts) >= SCALE_THRESHOLD:
|
|
self.set_kube_master(list(self.hosts.keys())[3:5])
|
|
else:
|
|
self.set_kube_master(list(self.hosts.keys())[:2])
|
|
self.set_kube_node(self.hosts.keys())
|
|
if len(self.hosts) >= SCALE_THRESHOLD:
|
|
self.set_calico_rr(list(self.hosts.keys())[:3])
|
|
else: # Show help if no options
|
|
self.show_help()
|
|
sys.exit(0)
|
|
|
|
self.write_config(self.config_file)
|
|
|
|
def write_config(self, config_file):
|
|
if config_file:
|
|
with open(config_file, 'w') as f:
|
|
self.config.write(f)
|
|
else:
|
|
print("WARNING: Unable to save config. Make sure you set "
|
|
"CONFIG_FILE env var.")
|
|
|
|
def debug(self, msg):
|
|
if DEBUG:
|
|
print("DEBUG: {0}".format(msg))
|
|
|
|
def get_ip_from_opts(self, optstring):
|
|
opts = optstring.split(' ')
|
|
for opt in opts:
|
|
if '=' not in opt:
|
|
continue
|
|
k, v = opt.split('=')
|
|
if k == "ip":
|
|
return v
|
|
raise ValueError("IP parameter not found in options")
|
|
|
|
def ensure_required_groups(self, groups):
|
|
for group in groups:
|
|
try:
|
|
self.debug("Adding group {0}".format(group))
|
|
self.config.add_section(group)
|
|
except configparser.DuplicateSectionError:
|
|
pass
|
|
|
|
def get_host_id(self, host):
|
|
'''Returns integer host ID (without padding) from a given hostname.'''
|
|
try:
|
|
short_hostname = host.split('.')[0]
|
|
return int(re.findall("\d+$", short_hostname)[-1])
|
|
except IndexError:
|
|
raise ValueError("Host name must end in an integer")
|
|
|
|
def build_hostnames(self, changed_hosts):
|
|
existing_hosts = OrderedDict()
|
|
highest_host_id = 0
|
|
try:
|
|
for host, opts in self.config.items('all'):
|
|
existing_hosts[host] = opts
|
|
host_id = self.get_host_id(host)
|
|
if host_id > highest_host_id:
|
|
highest_host_id = host_id
|
|
except configparser.NoSectionError:
|
|
pass
|
|
|
|
# FIXME(mattymo): Fix condition where delete then add reuses highest id
|
|
next_host_id = highest_host_id + 1
|
|
|
|
all_hosts = existing_hosts.copy()
|
|
for host in changed_hosts:
|
|
if host[0] == "-":
|
|
realhost = host[1:]
|
|
if self.exists_hostname(all_hosts, realhost):
|
|
self.debug("Marked {0} for deletion.".format(realhost))
|
|
all_hosts.pop(realhost)
|
|
elif self.exists_ip(all_hosts, realhost):
|
|
self.debug("Marked {0} for deletion.".format(realhost))
|
|
self.delete_host_by_ip(all_hosts, realhost)
|
|
elif host[0].isdigit():
|
|
if self.exists_hostname(all_hosts, host):
|
|
self.debug("Skipping existing host {0}.".format(host))
|
|
continue
|
|
elif self.exists_ip(all_hosts, host):
|
|
self.debug("Skipping existing host {0}.".format(host))
|
|
continue
|
|
|
|
next_host = "{0}{1}".format(HOST_PREFIX, next_host_id)
|
|
next_host_id += 1
|
|
all_hosts[next_host] = "ansible_host={0} ip={1}".format(
|
|
host, host)
|
|
elif host[0].isalpha():
|
|
raise Exception("Adding hosts by hostname is not supported.")
|
|
|
|
return all_hosts
|
|
|
|
def exists_hostname(self, existing_hosts, hostname):
|
|
return hostname in existing_hosts.keys()
|
|
|
|
def exists_ip(self, existing_hosts, ip):
|
|
for host_opts in existing_hosts.values():
|
|
if ip == self.get_ip_from_opts(host_opts):
|
|
return True
|
|
return False
|
|
|
|
def delete_host_by_ip(self, existing_hosts, ip):
|
|
for hostname, host_opts in existing_hosts.items():
|
|
if ip == self.get_ip_from_opts(host_opts):
|
|
del existing_hosts[hostname]
|
|
return
|
|
raise ValueError("Unable to find host by IP: {0}".format(ip))
|
|
|
|
def purge_invalid_hosts(self, hostnames, protected_names=[]):
|
|
for role in self.config.sections():
|
|
for host, _ in self.config.items(role):
|
|
if host not in hostnames and host not in protected_names:
|
|
self.debug("Host {0} removed from role {1}".format(host,
|
|
role))
|
|
self.config.remove_option(role, host)
|
|
|
|
def add_host_to_group(self, group, host, opts=""):
|
|
self.debug("adding host {0} to group {1}".format(host, group))
|
|
self.config.set(group, host, opts)
|
|
|
|
def set_kube_master(self, hosts):
|
|
for host in hosts:
|
|
self.add_host_to_group('kube-master', host)
|
|
|
|
def set_all(self, hosts):
|
|
for host, opts in hosts.items():
|
|
self.add_host_to_group('all', host, opts)
|
|
|
|
def set_k8s_cluster(self):
|
|
self.add_host_to_group('k8s-cluster:children', 'kube-node')
|
|
self.add_host_to_group('k8s-cluster:children', 'kube-master')
|
|
|
|
def set_calico_rr(self, hosts):
|
|
for host in hosts:
|
|
if host in self.config.items('kube-master'):
|
|
self.debug("Not adding {0} to calico-rr group because it "
|
|
"conflicts with kube-master group".format(host))
|
|
continue
|
|
if host in self.config.items('kube-node'):
|
|
self.debug("Not adding {0} to calico-rr group because it "
|
|
"conflicts with kube-node group".format(host))
|
|
continue
|
|
self.add_host_to_group('calico-rr', host)
|
|
|
|
def set_kube_node(self, hosts):
|
|
for host in hosts:
|
|
if len(self.config['all']) >= SCALE_THRESHOLD:
|
|
if self.config.has_option('etcd', host):
|
|
self.debug("Not adding {0} to kube-node group because of "
|
|
"scale deployment and host is in etcd "
|
|
"group.".format(host))
|
|
continue
|
|
if len(self.config['all']) >= MASSIVE_SCALE_THRESHOLD:
|
|
if self.config.has_option('kube-master', host):
|
|
self.debug("Not adding {0} to kube-node group because of "
|
|
"scale deployment and host is in kube-master "
|
|
"group.".format(host))
|
|
continue
|
|
self.add_host_to_group('kube-node', host)
|
|
|
|
def set_etcd(self, hosts):
|
|
for host in hosts:
|
|
self.add_host_to_group('etcd', host)
|
|
|
|
def load_file(self, files=None):
|
|
'''Directly loads JSON, or YAML file to inventory.'''
|
|
|
|
if not files:
|
|
raise Exception("No input file specified.")
|
|
|
|
import json
|
|
import yaml
|
|
|
|
for filename in list(files):
|
|
# Try JSON, then YAML
|
|
try:
|
|
with open(filename, 'r') as f:
|
|
data = json.load(f)
|
|
except ValueError:
|
|
try:
|
|
with open(filename, 'r') as f:
|
|
data = yaml.load(f)
|
|
print("yaml")
|
|
except ValueError:
|
|
raise Exception("Cannot read %s as JSON, YAML, or CSV",
|
|
filename)
|
|
|
|
self.ensure_required_groups(ROLES)
|
|
self.set_k8s_cluster()
|
|
for group, hosts in data.items():
|
|
self.ensure_required_groups([group])
|
|
for host, opts in hosts.items():
|
|
optstring = "ansible_host={0} ip={0}".format(opts['ip'])
|
|
for key, val in opts.items():
|
|
if key == "ip":
|
|
continue
|
|
optstring += " {0}={1}".format(key, val)
|
|
|
|
self.add_host_to_group('all', host, optstring)
|
|
self.add_host_to_group(group, host)
|
|
self.write_config(self.config_file)
|
|
|
|
def parse_command(self, command, args=None):
|
|
if command == 'help':
|
|
self.show_help()
|
|
elif command == 'print_cfg':
|
|
self.print_config()
|
|
elif command == 'print_ips':
|
|
self.print_ips()
|
|
elif command == 'load':
|
|
self.load_file(args)
|
|
else:
|
|
raise Exception("Invalid command specified.")
|
|
|
|
def show_help(self):
|
|
help_text = '''Usage: inventory.py ip1 [ip2 ...]
|
|
Examples: inventory.py 10.10.1.3 10.10.1.4 10.10.1.5
|
|
|
|
Available commands:
|
|
help - Display this message
|
|
print_cfg - Write inventory file to stdout
|
|
print_ips - Write a space-delimited list of IPs from "all" group
|
|
|
|
Advanced usage:
|
|
Add another host after initial creation: inventory.py 10.10.1.5
|
|
Delete a host: inventory.py -10.10.1.3
|
|
Delete a host by id: inventory.py -node1
|
|
|
|
Configurable env vars:
|
|
DEBUG Enable debug printing. Default: True
|
|
CONFIG_FILE File to write config to Default: ./inventory.cfg
|
|
HOST_PREFIX Host prefix for generated hosts. Default: node
|
|
SCALE_THRESHOLD Separate ETCD role if # of nodes >= 50
|
|
MASSIVE_SCALE_THRESHOLD Separate K8s master and ETCD if # of nodes >= 200
|
|
'''
|
|
print(help_text)
|
|
|
|
def print_config(self):
|
|
self.config.write(sys.stdout)
|
|
|
|
def print_ips(self):
|
|
ips = []
|
|
for host, opts in self.config.items('all'):
|
|
ips.append(self.get_ip_from_opts(opts))
|
|
print(' '.join(ips))
|
|
|
|
|
|
def main(argv=None):
|
|
if not argv:
|
|
argv = sys.argv[1:]
|
|
KargoInventory(argv, CONFIG_FILE)
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main())
|