Question: The task includes an option with an undefined variable. about ansible-mongodb

[isaackehle]

As a follow up, it seems my documentation is a bit misleading. I'll update the docs on the next go-around.

[isaackehle]

Yes, you do have to configure your inventory file properly. This playbook is intended to use a group of servers from your inventory, and allow you to designate which group you would like to use, via the rs_server_group_id variable.

There will be more info on how to do that on the ansible site of course, but as a quick and dirty example:

Inventory Directory Structure

inventories
├── app-servers
├── group_vars
|   ...
│   ├── app-cfg-servers.yml
│   ├── app-shard-servers.yml
│   ├── app-shd00-servers.yml
│   ├── app-shd01-servers.yml
│   ...

Set variables for one specific group example

> cat inventories/group_vars/app-shd00-servers.yml
---

# MongoDB Cluster Definitions - Group Settings
replica_set_name:     "app-shd00"
replica_set_group_id: "app-shd00-servers"

Defining the host names in the groups

> cat inventories/app-servers

...
[app-cfg-servers]
app-cfg-rs0
app-cfg-rs1
app-cfg-rs2

[app-shd00-servers]
app-shd00-rs0
app-shd00-rs1
app-shd00-rs2

[app-shd01-servers]
app-shd01-rs0
app-shd01-rs1
app-shd01-rs2

[app-shard-servers:children]
app-shd00-servers
app-shd01-servers

...

Thus for that example of the shard server 0 replica set:

- hosts: servers
  become: false
  vars:
    rs_port:                "27017"
    mongodb_type:           "daemon"

-- Do not set this here.  It is set in prep-vars.yml
--    rs_server_group_id:     "rs_mongo"

-- These are set in 'app-shd00-servers.yml'
--  replica_set_name:       "rs0"
--  cluster_role:           "shardsvr"
--	replica_set_name:     	"app-shd00"
--	replica_set_group_id: 	"app-shd00-servers"

    app_users:
      - { db_name: "", user: "", pwd: "", roles: ["readWrite", "userAdmin"] } 
  roles:
    - { role: pgkehle.mongodb, flags: ['init'] }        
    - { role: pgkehle.mongodb, flags: ['config_save'] }        
    - { role: pgkehle.mongodb, flags: ['storage_init'] }        
    - { role: pgkehle.mongodb, flags: ['rs_init'] }

...which is used in prep-vars.yml:

  - name: Set the rs group name from cfg_server_name
    set_fact:
      rs_server_group_id: "{{ cfg_server_group_id }}"    
    when:
      - cfg_server_group_id is defined

  - name: Set the rs group name from replica_set_name
    set_fact:
      rs_server_group_id: "{{ replica_set_group_id }}"
    when:
      - replica_set_group_id is defined

[isaackehle]

It's been 11 months or so since this was opened. I'm not sure if this is still an outstanding issue. Please confirm.

[PhanSon95]

Hi @pgkehle . Could you provide path where will place this configuration inside ansible project, thank you

cfg_server:
  name: "my-cfg" # (Required)
  group: "my-cfg-servers" # (Required) Always pass in the group id used for the config servers

replica_set:
  name: "my-cfg" # name of the replica set for the config server (prefix of fqdn)
  group: "my-cfg-servers" # group name for all servers in the replica set

Replica Set Only

cluster_role: "replicaSet"

Router Server

cluster_role: "router"

Config Server

cluster_role: "config"
replica_set:
  name: "my-cfg" # name of the replica set for the config server (prefix of fqdn)
  group: "my-cfg-servers" # group name for all servers in the replica set

Shard Server

cluster_role: "shard"
replica_set:
  name: "db-data" # name of the replica set for the shard server (prefix of fqdn)
  group: "db-data-servers" # group name for all servers in the replica set

[isaackehle]

What is the error message you are seeing, @PhanSon95?

Have you configured your inventories appropriately, and are targeting one server? ie logs would help.

In fact, I am going to close this issue now since it is over 2 years old. Please add in your specific issue in another issue w/ configs and logs and I can take a look.