Overview

Magpie is a charm used for testing the networking (ICMP and DNS specifically) of a juju provider/substrate. Simply deploy more than one Magpie charm and watch the status messages and debug logs.

Status messages will show the unit numbers that have issues - if there are no problems, there will not be a verbose status message.

All actions, strings, queries and actions are logged in the juju logs.

Workload Status

In addition to ICMP and DNS status messages, if a networking problem is detected, the workload status of the agent which has found the issues will be set to blocked.

Reactive States

This layer will set the following states:

• magpie-icmp.failed ICMP has failed to one or more units in the peer relation.
• magpie-dns.failed DNS has failed to one or more units in the peer relation.

Usage

juju deploy magpie -n 2
juju deploy magpie -n 1 --to lxc:1

This charm also supports the following config values:

  dns_server:
    default: ''
    description: DNS Server to use (default: system default)
    type: string
  dns_tries:
    default: 1
    description: Number of DNS resolution attempts per query
    type: int
  dns_time:
    default: 3
    description: Timeout in seconds per DNS query try
    type: int
  ping_timeout:
    default: 2
    description: Timeout in seconds per ICMP request
    type: int
  ping_tries:
    default: 1
    description: Number of ICMP packets per ping
    type: int

e.g.

juju set magpie dns_server=8.8.8.8