Development environments for charming

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Manual setup

See Juju | Development Setup

LXD profile

See gist by @rbarry.

Locally, in a VM

Multipass has the charm-dev blueprint which will create a VM with a juju controller ready to go:

multipass launch charm-dev

Alternatively, you could use version-pinned cloud-init scripts, for example:

multipass launch 
  --cloud-init https://raw.githubusercontent.com/Abuelodelanada/charm-dev-utils/main/cloud-init/charm-dev-juju-3.0.yaml

With multipass it is very easy to create disposable instances of different sizes. For example, to mimic the default github runner,

multipass launch 
  --cloud-init https://raw.githubusercontent.com/Abuelodelanada/charm-dev-utils/main/cloud-init/charm-dev-juju-3.0.yaml \
  --name charm-dev-2cpu-7g \
  --mem 7G \
  --cpus 2 \
  --disk 50G \
  --mount ~/code:/home/ubuntu/code

On GCP, using terraform

See https://github.com/sed-i/tf-gcp/tree/main/charm-dev

terraform apply -var-file="charm-dev.tfvars"
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To view workload UIs deployed in multipass from the host’s browser, you can use any of the following:

SSH port forwarding

$ sudo ssh -i /var/snap/multipass/common/data/multipassd/ssh-keys/id_rsa \                                                                                                          
  -o "UserKnownHostsFile=/dev/null" \
  -o "StrictHostKeyChecking no" \
  -L localhost:9090:<PROMETHEUS_UNIT_IP>:9090 \
  ubuntu@<MULTIPASS_VM_IP>

Note that if you have ingress in place inside the multipass VM, then you can curl/browse the multipass IP directly, without any port forwarding.

sshuttle

sudo sshuttle -r ubuntu@<MULTIPASS_VM_IP> 0/0 \
  --ssh-cmd 'ssh -o "UserKnownHostsFile=/dev/null" -o "StrictHostKeyChecking no" -i /var/snap/multipass/common/data/multipassd/ssh-keys/id_rsa'

Add route

sudo ip route add <GRAFANA_K8s_SVC_IP_RANGE> via <MULTIPASS_VM_IP>

h/t @dylanstathis.

vscode port forwarding

h/t @michaeldmitry.

Bridged network

Launch the multipass VM with --network flag. h/t @jose

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Regarding the bridged network you can launch a Multipass VM this way (note the --network enp1s0)

multipass launch --cloud-init charm-dev-juju-3.4.yaml \
--timeout 1200 \
--name charm-dev-34 \   
--memory 8G \
--cpus 4 \
--disk 60G \
--mount /home/jose/trabajos/canonical/repos:/home/ubuntu/repos \
--network enp1s0

Once the machine is working you can check that has an IP provided by the DHCP:

╭─ubuntu@charm-dev-34 ~ [microk8s:cos]
╰─$ ip r | grep default | grep 192
default via 192.168.1.1 dev enp6s0 proto dhcp src 192.168.1.178 metric 200

Now you need to enable metallb in the VM so Traefik may get an external IP:

sudo microk8s enable metallb 192.168.1.250-192.168.1.255

Note that we are assigning metallb a range between *.250 to *.255. Make sure that your DHCP will NOT use those IPs.

Now you can access your charm’s UIs using a LAN IP:

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