A ansible dynamic resource inventory, the script specification need to achieve --list, - host option, and outputs the data to json.
1. --list Output:
[root@master_101 ansible]# ./dy_host.py --list
{
"all": [
"192.168.8.101",
"192.168.8.102"
],
"web": {
"hosts": [
"192.168.8.101"
],
"vars": {
"aa": 10
}
},
"web2": {
"hosts": [
"192.168.8.101",
"192.168.8.102"
]
}
}
## where the hosts, vars is the key character, can not be changed
2. --host output:
[root@master_101 ansible]# ./dy_host.py --host 192.168.8.102
{
"ansible_host": "192.168.8.102",
"ansible_port": 22,
"ansible_user": "sun",
"ansible_password": "qweasd",
"ansible_become": "true",
"ansible_become_method": "su",
"ansible_become_user": "root",
"ansible_become_pass": "qweasd"
}
3. _meta keywords
If inventory script top-level element returned is "_meta", it may return variables of all hosts. If this element contains a value called "hostvars". This inventory script for each host with a call, they will not call --host option to operate on the target host, but the use of information hostvars in the target host to the target host operation.
[root@master_101 ansible]# ./dy_host.py --list
{
"_meta": {
"hostvars": {
"192.168.8.101": {
"ansible_user": "root",
"ansible_password": "qweasd"
},
"192.168.8.102": {
"ansible_user": "sun",
"ansible_password": "qweasd",
"ansible_become": "true",
"ansible_become_method": "su",
"ansible_become_user": "root",
"ansible_become_pass": "qweasd"
}
}
},
"all": [
"192.168.8.101",
"192.168.8.102"
],
"web": {
"hosts": [
"192.168.8.101"
],
"vars": {
"aa": 10
}
},
"web2": {
"hosts": [
"192.168.8.101",
"192.168.8.102"
]
}
}
4 Script example
[root@master_101 ansible]# cat dy_host.py
#!/usr/bin/env python3
#coding:utf8
import json
import sys
def group():
hosts = {
'_meta' : {
"hostvars": {
'192.168.8.101':{'ansible_user':'root','ansible_password':'qweasd'},
'192.168.8.102':{'ansible_user':'sun','ansible_password': 'qweasd',
'ansible_become':'true',
'ansible_become_method':'su',
'ansible_become_user':'root',
'ansible_become_pass':'qweasd'
}
}
},
'all': ['192.168.8.101','192.168.8.102'],
'web':{"hosts": ['192.168.8.101'],'vars': {'aa':10},},
'web2': {"hosts":['192.168.8.101','192.168.8.102']}
}
print(json.dumps(hosts,indent=4))
def host(ip):
hosts = {
"192.168.8.101": {
"ansible_host":"192.168.8.101",
"ansible_port":22,
"ansible_user":"root",
"ansible_pass":"qweasd"
},
"192.168.8.102": {
"ansible_host":"192.168.8.102",
"ansible_port":22,
"ansible_user":"sun",
"ansible_password":"qweasd",
'ansible_become':'true',
'ansible_become_method':'su',
'ansible_become_user':'root',
'ansible_become_pass':'qweasd'
}
}
j = json.dumps(hosts[ip],indent=4)
print(j)
def main():
if len(sys.argv) == 2 and (sys.argv[1] == '--list'):
group()
elif len(sys.argv) == 3 and (sys.argv[1] == '--host'):
host(sys.argv[2])
else:
print("Usage: %s --list or --host <hostname>" % sys.argv[0])
if __name__ == '__main__':
main()