Charmed PostgreSQL VM

Channel Revision Published Runs on
latest/stable 345 09 Nov 2023
Ubuntu 22.04 Ubuntu 20.04 Ubuntu 18.04 Ubuntu 16.04
14/stable 363 21 Feb 2024
Ubuntu 22.04
14/candidate 363 31 Jan 2024
Ubuntu 22.04
14/beta 368 21 Feb 2024
Ubuntu 22.04
14/edge 369 23 Feb 2024
Ubuntu 22.04
juju deploy postgresql --channel 14/stable
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How to enable monitoring (COS)

Note: The feature is currently only available in the channel 14/candidate (revision 296+) and will be released to the channel 14/stable soon.

Note: All commands are written for juju >= v.3.0

If you are using an earlier version, be aware that:

  • juju run replaces juju run-action --wait in juju v.2.9
  • juju integrate replaces juju relate and juju add-relation in juju v.2.9

For more information, check the Juju 3.0 Release Notes.


Enable monitoring requires that you:

First, switch to the COS K8s environment and offer COS interfaces to be cross-model integrated with the Charmed PostgreSQL VM model.

To switch to the Kubernetes controller for the COS model, run

juju switch <k8s_controller>:<cos_model_name>

To offer the COS interfaces, run

juju offer grafana:grafana-dashboard grafana-dashboards
juju offer loki:logging loki-logging
juju offer prometheus:receive-remote-write prometheus-receive-remote-write

Consume offers via the PostgreSQL model

Next, we will switch to the Charmed PostgreSQL VM model, find offers, and consume them.

We are currently on the Kubernetes controller for the COS model. To switch to the PostgreSQL model, run

juju switch <machine_controller_name>:<postgresql_model_name>

To find offers, run

juju find-offers <k8s_controller>:admin/<cos_model_name>

The output should be similar to the sample below, where k8s is the k8s controller name and cos is the model where cos-lite has been deployed:

Store      URL                                        Access  Interfaces
k8s        admin/cos.grafana-dashboards               admin   grafana_dashboard:grafana-dashboard
k8s        admin/cos.loki-logging                     admin   loki_push_api:logging
k8s        admin/cos.prometheus-receive-remote-write  admin   prometheus-receive-remote-write:receive-remote-write

To consume offers to be reachable in the current model, run

juju consume <k8s_controller>:admin/cos.prometheus-receive-remote-write
juju consume <k8s_controller>:admin/cos.loki-logging
juju consume <k8s_controller>:admin/cos.grafana-dashboards

Deploy and integrate Grafana

First, deploy the grafana-agent subordinate charm.

juju deploy grafana-agent

Then, integrate (previously known as “relate”) it with PostgreSQL

juju integrate postgresql:cos-agent grafana-agent

Finally, integrate grafana-agent with consumed COS offers:

juju integrate grafana-agent grafana-dashboards
juju integrate grafana-agent loki-logging
juju integrate grafana-agent prometheus-receive-remote-write

After this is complete, Grafana will show the new dashboard PostgreSQL Exporter and will allow access to Charmed PostgreSQL logs on Loki.

Sample outputs

Below is a sample output of juju status on the Charmed PostgreSQL VM model:

ubuntu@localhost:~$ juju status
Model      Controller  Cloud/Region         Version  SLA          Timestamp
vmmodel    local       localhost/localhost  2.9.42   unsupported  00:12:18+02:00

SAAS                             Status  Store    URL
grafana-dashboards               active  k8s      admin/cos.grafana-dashboards
loki-logging                     active  k8s      admin/cos.loki-logging
prometheus-receive-remote-write  active  k8s      admin/cos.prometheus-receive-remote-write

App                   Version      Status  Scale  Charm               Channel   Rev  Exposed  Message
grafana-agent                      active      1  grafana-agent       edge        5  no
postgresql              14.7       active      1  postgresql          14/edge   296  no       Primary

Unit                          Workload  Agent  Machine  Public address  Ports               Message
postgresql/3*                 active    idle   4                       Primary
  grafana-agent/0*            active    idle  

Machine  State    Address        Inst id        Series  AZ  Message
4        started  juju-fcde9e-4  jammy       Running

Example of juju status on a COS K8s model:

ubuntu@localhost:~$ juju status
Model  Controller   Cloud/Region        Version  SLA          Timestamp
cos    k8s          microk8s/localhost  2.9.42   unsupported  00:15:31+02:00

App           Version  Status  Scale  Charm             Channel  Rev  Address         Exposed  Message
alertmanager  0.23.0   active      1  alertmanager-k8s  stable    47  no
catalogue              active      1  catalogue-k8s     stable    13  no
grafana       9.2.1    active      1  grafana-k8s       stable    64  no
loki          2.4.1    active      1  loki-k8s          stable    60  no
prometheus    2.33.5   active      1  prometheus-k8s    stable   103  no
traefik       2.9.6    active      1  traefik-k8s       stable   110   no

Unit             Workload  Agent  Address      Ports  Message
alertmanager/0*  active    idle
catalogue/0*     active    idle
grafana/0*       active    idle
loki/0*          active    idle
prometheus/0*    active    idle
traefik/0*       active    idle

Offer                            Application  Charm           Rev  Connected  Endpoint              Interface                Role
grafana-dashboards               grafana      grafana-k8s     64   1/1        grafana-dashboard     grafana_dashboard        requirer
loki-logging                     loki         loki-k8s        60   1/1        logging               loki_push_api            provider
prometheus-receive-remote-write  prometheus   prometheus-k8s  103  1/1        receive-remote-write  prometheus_remote_write  provider

Connect Grafana web interface

To connect the Grafana web interface, follow the Browse dashboards section of the MicroK8s “Getting started” guide.