98 lines
2.6 KiB
Python
Executable file
98 lines
2.6 KiB
Python
Executable file
#!/usr/bin/env python
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# A simple dynamic replacemant of 'kargo prepare'
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# Generates ansible inventory from a list of IPs in 'nodes' file.
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import argparse
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import json
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import os
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import yaml
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def read_nodes_from_file(filename):
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f = open(filename, 'r')
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content = [x.strip('\n') for x in f.readlines()]
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return content
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def read_vars_from_file(src="/root/kargo/inventory/group_vars/all.yml"):
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with open(src, 'r') as f:
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content = yaml.load(f)
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return content
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def nodes_to_hash(nodes_list, masters, group_vars):
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nodes = {
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'all': {
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'hosts': [],
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'vars': group_vars
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},
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'etcd': {
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'hosts': [],
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},
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'kube-master': {
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'hosts': [],
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},
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'kube-node': {
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'hosts': [],
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},
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'k8s-cluster': {
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'children': ['kube-node', 'kube-master']
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},
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'_meta': {
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'hostvars': {}
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}
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}
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i = 1
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for node_ip in nodes_list:
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node_name = "node%s" % i
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nodes['all']['hosts'].append(node_name)
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nodes['_meta']['hostvars'][node_name] = {
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'ansible_ssh_host': node_ip,
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'ip': node_ip,
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}
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nodes['kube-node']['hosts'].append(node_name)
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if i <= masters:
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nodes['kube-master']['hosts'].append(node_name)
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if i <= 3:
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nodes['etcd']['hosts'].append(node_name)
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i += 1
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return nodes
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def main():
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parser = argparse.ArgumentParser(description='Kargo inventory simulator')
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parser.add_argument('--list', action='store_true')
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parser.add_argument('--host', default=False)
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args = parser.parse_args()
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# Read params from ENV since ansible does not support passing args to dynamic inv scripts
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if os.environ.get('K8S_NODES_FILE'):
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nodes_file = os.environ['K8S_NODES_FILE']
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else:
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nodes_file = 'nodes'
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if os.environ.get('K8S_MASTERS'):
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masters = int(os.environ['K8S_MASTERS'])
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else:
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masters = 2
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if os.environ.get('KARGO_GROUP_VARS'):
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vars_file = os.environ['KARGO_GROUP_VARS']
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else:
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vars_file = "/root/kargo/inventory/group_vars/all.yml"
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nodes_list = read_nodes_from_file(nodes_file)
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if len(nodes_list) < 3:
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print "Error: requires at least 3 nodes"
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return
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nodes = nodes_to_hash(nodes_list, masters, read_vars_from_file(vars_file))
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if args.host:
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print json.dumps(nodes['_meta']['hostvars'][args.host])
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else:
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print json.dumps(nodes)
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if __name__ == "__main__":
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main()
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