Building packages with Micro and k3s

How to build packages with Luet in Mocaccino Micro and k3s

In Micro, currently it’s possible to build packages with K3s and Luet

First install k3s:

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luet install -y container/k3s runit-srv/k3s

And start it:

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$ runit-start k3s

To enable it permanently on boot, run runit-enable k3s

Wait for k3s to be ready (Until ContainerCreating becomes Ready):

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$ watch k3s kubectl get pods -A

Now install the luet controller:

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$ k3s kubectl apply -f https://raw.githubusercontent.com/mudler/luet-k8s/master/hack/kube.yaml

And wait for it to be ready:

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$ watch k3s kubectl get pods -A

Once all is up, we are ready to build packages, try for example with:

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$ cat <<EOF | k3s kubectl apply -f -
apiVersion: luet.k8s.io/v1alpha1
kind: PackageBuild
metadata:
  name: test
spec:
  packageName: container/img
  repository: 
    url: "https://github.com/mocaccinoOS/mocaccino-extra"
  options:
    pull: true
    imageRepository: "quay.io/mocaccinocache/extra-amd64-cache"
EOF

In this case, we can inspect the build logs with:

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k3s kubectl logs -f test

(advanced) Multi-node setup

This section shows how to configure 2(or more) MocaccinoOS Micro instances with K3s and edgevpn.

Install edgevpn and k3s

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luet install -y runit-srv/edgevpn utils/edgevpn container/k3s runit-srv/k3s

Generate edgevpn configuration

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edgevpn -g > vpn.yaml

Save the configuration file, it has to be available on all the machines that will belong to the cluster.

Start the vpn

We are ready to try to start the vpn:

  • on node A: sudo IFACE=edgevpn0 ADDRESS=10.1.0.3/24 EDGEVPNCONFIG=vpn.yml edgevpn

  • on node B: sudo IFACE=edgevpn0 ADDRESS=10.1.0.4/24 EDGEVPNCONFIG=vpm.yml edgevpn

Where:

  • IFACE is the vpn interface to be created
  • ADDRESS is the address of the node in the vpn network
  • EDGEVPNCONFIG is the path of the configuration which was generated before

If all goes well, we should see some connection messages, and after a while we should be able to ping the nodes.

Start k3s:

  • on node A: k3s server --flannel-iface=edgevpn0

  • on node B: K3S_URL=https://10.1.0.3:6443 K3S_TOKEN=xx k3s agent --flannel-iface=edgevpn0 --node-ip 10.1.0.4

Permanent setup

Annotate the IFACE, ADDRESS, and EDGEVPNCONFIG in /etc/sv/edgevpn/conf in each node, and then you can use the following yip file for example to configure k3s (to place under /etc/yip.d):

Node A:

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stages:
  boot:
       -  name: "k3s"
          commands:
          - |
              if [ ! -e "/usr/bin/k3s" ]; then
                luet install -y container/k3s runit-srv/k3s
                runit-enable k3s
              fi
          - ulimit -u unlimited
          files:
          - path: "/etc/sv/k3s/run"
            owner: 0
            group: 0
            permissions: 0755
            content: |
              #!/bin/sh

              exec 2>&1

              [ -r ./conf ] && . ./conf

              echo 'k3s starting.'

              LANG=C LC_ALL=C \
              exec /usr/bin/k3s server --flannel-iface=edgevpn0 2>&1

Node B:

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stages:
  boot:
       -  name: "k3s"
          commands:
          - |
              if [ ! -e "/usr/bin/k3s" ]; then
                luet install -y container/k3s runit-srv/k3s
                runit-enable k3s
              fi
          - ulimit -u unlimited
          files:
          - path: "/etc/sv/k3s/run"
            owner: 0
            group: 0
            permissions: 0755
            content: |
              #!/bin/sh

              exec 2>&1

              [ -r ./conf ] && . ./conf

              echo 'k3s starting.'

              LANG=C LC_ALL=C K3S_URL=https://10.1.0.1:6443 K3S_TOKEN=xxx \
              exec /usr/bin/k3s agent --flannel-iface=edgevpn0 --node-ip 10.1.0.13 2>&1

Then enable the services at boot:

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$ runit-enable k3s
$ runit-enable edgevpn

Example

Last modified July 29, 2021: Add docs on how to migrate from Gentoo (af1ca38)