Charmed advanced-routing howto - migration

charm
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Migration steps from the policy-routing charm

Initial deployment

The following steps assume that an ubuntu unit with a subordinate policy-routing charm with the following config has been deployed:

application: policy-routing
application-config:
  trust:
    default: false
    description: Does this application have access to trusted credentials
    source: default
    type: bool
    value: false
charm: policy-routing
settings:
  cidr:
    description: |
      CIDR of the network interface to setup a policy routing.
      e.g. 192.168.0.0/24
    source: user
    type: string
    value: 10.10.51.0/24
  gateway:
    description: |
      The gateway to be used from the network interface specified with
      the CIDR. e.g. 192.168.0.254
    source: user
    type: string
    value: 10.10.51.1

juju status looks like:

$ juju status
Model        Controller  Cloud/Region         Version  SLA          Timestamp
model1  lxd         localhost/localhost  2.7.2    unsupported  11:52:19Z

App                       Version     Status   Scale  Charm                     Store       Rev  OS      Notes
policy-routing                        waiting      0  policy-routing            jujucharms    3  ubuntu
ubuntu                    18.04       active       1  ubuntu                    jujucharms   15  ubuntu


Unit                   Workload  Agent      Machine  Public address  Ports               Message
ubuntu/0*              active    idle       127      10.0.8.155                          ready
  policy-routing/0*    active    idle                10.0.8.155                          Unit ready

Deploy advanced-routing charm

  • juju deploy advanced-routing
  • juju add-relation ubuntu advanced-routing

Advanced-routing is in status blocked with message: “Please disable charm-policy-routing”

Apply the following config:

$ cat ./advanced_routing_config
advanced-routing:
  enable-advanced-routing: true
  advanced-routing-config: |
      [ {
          "type": "table",
          "table": "SF1"
      }, {
          "type": "route",
          "default_route": true,
          "gateway": "10.10.51.1",
          "table": "SF1"
      }, {
          "type": "rule",
          "from-net": "10.10.51.0/24",
          "to-net": "10.10.51.0/24",
          "priority": 100
      }, {
          "type": "rule",
          "from-net": "10.10.51.0/24",
          "table": "SF1",
          "priority": 101
      } ]

with the command:

juju config advanced-routing --file ./advanced_routing_config

Disable the old config

juju run -u ubuntu/0 "sudo systemctl stop charm-pre-install-policy-routing ; sudo systemctl disable charm-pre-install-policy-routing ; sudo rm -f /etc/systemd/system/charm-pre-install-policy-routing.service; "

Apply the routing configuration with the new charm

Using the action apply-changes, add the routes using the advance-routing charm

juju run-action advanced-routing/0 apply-changes --wait