Generate ansible dynamic inventory from static inventory.
Optionally, Replace the host list of ansible static inventory with ServiceAddress registered in consul service.
- Dynamic inventory conversion from Static inventory
- Merge Dynamic inventory into Static inventory cf. gce.py(dynamic inventory) + group_vars(static inventory)
- In the service operated using Consul, inventory is dynamically generated without rewriting static inventory when host information changes dynamically, such as automatic failover
- Confirm the inventory structure with plantuml
Ansible inventory Ansible Dynamic Inventory Consul Catalog Service
$ yum install gcc python-devel openssl-devel python-pip
$ pip install --upgrade pip setuptools (optional)
$ pip install ansible-dynamic-inventory
If the group name written in the ansible static inventory and the service name registered in the consul service are the same, the host name is replaced.
# Stand alone execution
$ ansible-dynamic-inventory --list
# Stand alone execution and specified config file
$ ansible-dynamic-inventory --list --config /path/to/config
# or Specify config file with environment variable
$ ANSIBLE_DYNAMIC_INVENTORY_CONFIG_PATH=/path/to/config ansible-dynamic-inventory --list
# As Ansible Dynamic Inventory execution
$ ansible-playbook --inventory ansible-dynamic-inventory /path/to/playbook.yml
# outut in platuml format
ansible-dynamic-inventory --plantuml
# vi ansible_dynamic_inventory.ini
[ansible]
# If both static_inventory_path and dynamic_inventory_path are specified,
# merge dynamic_inventory into static_inventory
# Either static_inventory_path or dynamic_inventory_path must not be empty
# path to static inventory file or directory
static_inventory_path = /path/to/ansible_inventory
# path to dynamic inventory file
#dynamic_inventory_path = ./gce.py
dynamic_inventory_path =
[consul]
#url = http://localhost:8500/v1
url =
ex. ansible:static_inventory_path = ${this repository}/sample_inventory
$ ansible-dynamic-inventory --list
{
"all": {
"hosts": [
"10.10.10.12",
"10.10.10.13",
"10.10.10.14",
"10.10.10.15",
"10.10.10.11"
],
"children": [
"ungrouped",
"_mysql_replication_config",
"mysql_backup_storage"
],
"vars": {
"datacenter": "vagrant",
"net_cidr": "10.10.10.0/24"
}
},
"_mysql_replication_config": {
"hosts": [
"10.10.10.12",
"10.10.10.13",
"10.10.10.14",
"10.10.10.15",
"10.10.10.11"
],
"children": [
"mysql_replication_master",
"mysql_replication_slave",
"mysql_replication_backup",
"mysql_failover"
],
"vars": {
"mysql_replication_user": "root",
"mysql_master_host": "{{groups.mysql_replication_master[0]}}",
"mysql_master_group_name": "mysql_replication_master",
"mysql_version": "5.6.34",
"mysql_replication_group_name": "single",
"mysql_slave_group_name": "mysql_replication_slave"
}
},
"_meta": {
"hostvars": {
"10.10.10.15": {},
"10.10.10.14": {},
"10.10.10.11": {},
"10.10.10.13": {},
"10.10.10.12": {
"hostvar": "dummy"
}
}
},
"mysql_backup_storage": {
"hosts": [
"10.10.10.15"
],
"vars": {
"mysql_backup_target_host": "{{groups.mysql_replication_backup[0]}}",
"mysql_backup_storage_cron_file": "../../../../varfiles/vagrant/mysql/backup_storage/mysql_backup"
}
},
"mysql_replication_slave": {
"hosts": [
"10.10.10.13",
"10.10.10.14"
]
},
"mysql_replication_backup": {
"hosts": [
"10.10.10.15"
]
},
"ungrouped": {},
"mysql_failover": {
"hosts": [
"10.10.10.11"
],
"vars": {
"mysql_failover_config_file": "../../../../varfiles/vagrant/mysql/failover/config.yml"
}
},
"mysql_replication_master": {
"hosts": [
"10.10.10.12"
]
}
}
ex. ansible:static_inventory_path = ${this repository}/sample_inventory
- Ansible host information is converted in plantuml "object"
- Ansible group information is converted in plantuml "package"
- Ansible group variable information is converted in plantuml "class"
$ /usr/bin/ansible-dynamic-inventory --plantuml
@startuml
object 10.10.10.15
object 10.10.10.14
object 10.10.10.11
object 10.10.10.13
object 10.10.10.12 {
"hostvar": "dummy"
}
package all {
all_hosts - 10.10.10.12
all_hosts - 10.10.10.13
all_hosts - 10.10.10.14
all_hosts - 10.10.10.15
all_hosts - 10.10.10.11
class all_vars
all_children - ungrouped
all_children - _mysql_replication_config
all_children - mysql_backup_storage
}
class all_vars {
"datacenter": "vagrant"
"net_cidr": "10.10.10.0/24"
}
package _mysql_replication_config {
_mysql_replication_config_hosts - 10.10.10.12
_mysql_replication_config_hosts - 10.10.10.13
_mysql_replication_config_hosts - 10.10.10.14
_mysql_replication_config_hosts - 10.10.10.15
_mysql_replication_config_hosts - 10.10.10.11
class _mysql_replication_config_vars
_mysql_replication_config_children - mysql_replication_master
_mysql_replication_config_children - mysql_replication_slave
_mysql_replication_config_children - mysql_replication_backup
_mysql_replication_config_children - mysql_failover
}
class _mysql_replication_config_vars {
"mysql_replication_user": "root"
"mysql_master_host": "{{groups.mysql_replication_master[0]}}"
"mysql_master_group_name": "mysql_replication_master"
"mysql_version": "5.6.34"
"mysql_replication_group_name": "single"
"mysql_slave_group_name": "mysql_replication_slave"
}
package mysql_backup_storage {
mysql_backup_storage_hosts - 10.10.10.15
class mysql_backup_storage_vars
}
class mysql_backup_storage_vars {
"mysql_backup_target_host": "{{groups.mysql_replication_backup[0]}}"
"mysql_backup_storage_cron_file": "../../../../varfiles/vagrant/mysql/backup_storage/mysql_backup"
}
package mysql_replication_slave {
mysql_replication_slave_hosts - 10.10.10.13
mysql_replication_slave_hosts - 10.10.10.14
}
package mysql_replication_backup {
mysql_replication_backup_hosts - 10.10.10.15
}
package ungrouped {}
package mysql_failover {
mysql_failover_hosts - 10.10.10.11
class mysql_failover_vars
}
class mysql_failover_vars {
"mysql_failover_config_file": "../../../../varfiles/vagrant/mysql/failover/config.yml"
}
package mysql_replication_master {
mysql_replication_master_hosts - 10.10.10.12
}
@enduml
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