Charmed MySQL

  • By Canonical Data Platform
  • Cloud
Channel Revision Published Runs on
8.0/stable 240 20 Jun 2024
Ubuntu 22.04
8.0/candidate 240 17 Jun 2024
Ubuntu 22.04
8.0/beta 240 17 Jun 2024
Ubuntu 22.04
8.0/edge 253 12 Jul 2024
Ubuntu 22.04
8.0/edge 252 12 Jul 2024
Ubuntu 22.04
juju deploy mysql --channel 8.0/stable
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Note: All commands are written for juju >= v3.1

If you’re using juju 2.9, check the juju 3.0 Release Notes.

Enable tracing

This guide contains the steps to enable tracing with Grafana Tempo for your MySQL application.

To summarize:

Warning: This is feature is in development. It is not recommended for production environments.

This feature is available for Charmed MySQL revision 237+ only.


Enabling tracing with Tempo requires that you:

Deploy Tempo

First, switch to the Kubernetes controller where the COS model is deployed:

juju switch <k8s_controller_name>:<cos_model_name>

Then, deploy the tempo-k8s charm:

juju deploy -n 1 tempo-k8s --channel latest/edge

Integrate with the COS charms

Integrate tempo-k8s with the COS charms as follows:

juju integrate tempo-k8s:grafana-dashboard grafana:grafana-dashboard
juju integrate tempo-k8s:grafana-source grafana:grafana-source
juju integrate tempo-k8s:ingress traefik:traefik
juju integrate tempo-k8s:metrics-endpoint prometheus:metrics-endpoint
juju integrate tempo-k8s:logging loki:logging

If you would like to instrument traces from the COS charms as well, create the following integrations:

juju integrate tempo-k8s:tracing alertmanager:tracing
juju integrate tempo-k8s:tracing catalogue:tracing
juju integrate tempo-k8s:tracing grafana:tracing
juju integrate tempo-k8s:tracing loki:tracing
juju integrate tempo-k8s:tracing prometheus:tracing
juju integrate tempo-k8s:tracing traefik:tracing

Offer interfaces

Next, offer interfaces for cross-model integrations from the model where Charmed MySQL is deployed.

To offer the Tempo integration, run

juju offer tempo-k8s:tracing

Then, switch to the Charmed MySQL VM model, find the offers, and integrate (relate) with them:

juju switch <machine_controller_name>:<mysql_model_name>

juju find-offers <k8s_controller_name>:  

:exclamation: Do not miss the “:” in the command above.

Below is a sample output where k8s is the K8s controller name and cos is the model where cos-lite and tempo-k8s are deployed:

Store  URL                            Access  Interfaces
k8s    admin/cos.tempo-k8s            admin   tracing:tracing

Next, consume this offer so that it is reachable from the current model:

juju consume k8s:admin/cos.tempo-k8s

Relate Charmed MySQL with the above consumed interface:

juju integrate mysql:tracing tempo-k8s:tracing

Wait until the model settles. The following is an example of the juju status --relations on the Charmed MySQL model:

Model  Controller  Cloud/Region         Version  SLA          Timestamp
mysql  lxd         localhost/localhost  3.4.2    unsupported  20:20:15Z

SAAS       Status  Store  URL
tempo-k8s  active  k8s   admin/cos.tempo-k8s

App    Version          Status  Scale  Charm  Channel  Rev  Exposed  Message
mysql  8.0.36-0ubun...  active      1  mysql           239  no       

Unit      Workload  Agent  Machine  Public address  Ports           Message
mysql/0*  active    idle   0  3306,33060/tcp  Primary

Machine  State    Address         Inst id        Base          AZ  Message
0        started  juju-d32b3c-0  ubuntu@22.04      Running

Integration provider  Requirer              Interface    Type     Message
mysql:database-peers  mysql:database-peers  mysql_peers  peer     
mysql:restart         mysql:restart         rolling_op   peer     
mysql:upgrade         mysql:upgrade         upgrade      peer     
tempo-k8s:tracing     mysql:tracing         tracing      regular

Note: All traces are exported to Tempo using HTTP. Support for sending traces via HTTPS is an upcoming feature.

View traces

After this is complete, the Tempo traces will be accessible from Grafana under the Explore section with tempo-k8s as the data source. You will be able to select mysql as the Service Name under the Search tab to view traces belonging to Charmed MySQL.

Below is a screenshot demonstrating a Charmed MySQL trace:

Feel free to read through the Tempo documentation at your leisure to explore its deployment and its integrations.