Prepare Air-Gapped Cluster

Follow these steps only if you are upgrading an air-gapped Cluster.

Patch `containerd` config

Download the current /etc/containerd/config.toml from one of the nodes.
Edit the metrics section, replacing the node’s IP address with {{ inventory_hostname }}. The section will be the following:
```
[metrics]
address = "{{ inventory_hostname }}:1338"
grpc_histogram = false
```
Setup the registry variables:
```
export DOCKER_REGISTRY_HOST=<registry-address>
export DOCKER_REGISTRY_PORT=<registry-port>
export DOCKER_REGISTRY_ADDRESS="<https/http>://${DOCKER_REGISTRY_HOST}:${DOCKER_REGISTRY_PORT}"
export DOCKER_REGISTRY_USERNAME=<registry-username>
export DOCKER_REGISTRY_PASSWORD=<registry-password>
```
- DOCKER_REGISTRY_HOST: the hostname / IP address of an existing Docker registry that the cluster nodes use when pulling images.
- DOCKER_REGISTRY_PORT: the TCP port the registry listens on.
- DOCKER_REGISTRY_ADDRESS: the full address of the registry with the protocol specified (https|http).
- DOCKER_REGISTRY_USERNAME: the username for registry auth.
- DOCKER_REGISTRY_PASSWORD: the password for registry auth.
NOTE: If your registry does not require auth, you may omit DOCKER_REGISTRY_USERNAME and DOCKER_REGISTRY_PASSWORD and the plugins."io.containerd.grpc.v1.cri".registry.configs section

Edit the plugins."io.containerd.grpc.v1.cri".registry section and replace the contents with:

[plugins."io.containerd.grpc.v1.cri".registry]
  [plugins."io.containerd.grpc.v1.cri".registry.mirrors]
    [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
      endpoint = ["${DOCKER_REGISTRY_ADDRESS}/v2/","https://registry-1.docker.io"]
    [plugins."io.containerd.grpc.v1.cri".registry.mirrors."*"]
      endpoint = ["${DOCKER_REGISTRY_ADDRESS}/v2/"]
  [plugins."io.containerd.grpc.v1.cri".registry.configs]
    [plugins."io.containerd.grpc.v1.cri".registry.configs."${DOCKER_REGISTRY_ADDRESS}".auth]
        username = "${DOCKER_REGISTRY_USERNAME}"
        password = "${DOCKER_REGISTRY_PASSWORD}"
        auth = ""
        identitytoken = ""

The full contents of the file will be similar to the following:

version = 2
root = "/var/lib/containerd"
state = "/run/containerd"
plugin_dir = ""
disabled_plugins = []
required_plugins = []
oom_score = 0


[grpc]
  address = "/run/containerd/containerd.sock"
  tcp_address = ""
  tcp_tls_cert = ""
  tcp_tls_key = ""
  uid = 0
  gid = 0
  max_recv_message_size = 16777216
  max_send_message_size = 16777216

[ttrpc]
  address = ""
  uid = 0
  gid = 0

[debug]
  address = ""
  uid = 0
  gid = 0
  level = ""

[metrics]
  address = "{{ inventory_hostname }}:1338"
  grpc_histogram = false

[cgroup]
  path = ""

[timeouts]
  "io.containerd.timeout.shim.cleanup" = "5s"
  "io.containerd.timeout.shim.load" = "5s"
  "io.containerd.timeout.shim.shutdown" = "3s"
  "io.containerd.timeout.task.state" = "2s"

[plugins]
  [plugins."io.containerd.gc.v1.scheduler"]
    pause_threshold = 0.02
    deletion_threshold = 0
    mutation_threshold = 100
    schedule_delay = "0s"
    startup_delay = "100ms"
  [plugins."io.containerd.grpc.v1.cri"]
    disable_tcp_service = true
    stream_server_address = "127.0.0.1"
    stream_server_port = "0"
    stream_idle_timeout = "4h0m0s"
    enable_selinux = false
    sandbox_image = "${DOCKER_REGISTRY_HOST}:${DOCKER_REGISTRY_PORT}/k8s.gcr.io/pause:3.2"
    stats_collect_period = 10
    systemd_cgroup = false
    enable_tls_streaming = false
    max_container_log_line_size = 16384
    disable_cgroup = false
    disable_apparmor = false
    restrict_oom_score_adj = false
    max_concurrent_downloads = 3
    disable_proc_mount = false
    [plugins."io.containerd.grpc.v1.cri".containerd]
      snapshotter = "overlayfs"
      default_runtime_name = "runc"
      no_pivot = false
      [plugins."io.containerd.grpc.v1.cri".containerd.default_runtime]
        runtime_type = ""
        runtime_engine = ""
        runtime_root = ""
        privileged_without_host_devices = false
      [plugins."io.containerd.grpc.v1.cri".containerd.untrusted_workload_runtime]
        runtime_type = ""
        runtime_engine = ""
        runtime_root = ""
        privileged_without_host_devices = false
      [plugins."io.containerd.grpc.v1.cri".containerd.runtimes]
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
          runtime_type = "io.containerd.runc.v1"
          runtime_engine = ""
          runtime_root = ""
          privileged_without_host_devices = false
        [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.nvidia-container-runtime]
          runtime_type = "io.containerd.runc.v1"
          [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.nvidia-container-runtime.options]
            BinaryName = "/usr/bin/nvidia-container-runtime"
    [plugins."io.containerd.grpc.v1.cri".cni]
      bin_dir = "/opt/cni/bin"
      conf_dir = "/etc/cni/net.d"
      max_conf_num = 1
      conf_template = ""
    [plugins."io.containerd.grpc.v1.cri".registry]
      [plugins."io.containerd.grpc.v1.cri".registry.mirrors]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
          endpoint = ["${DOCKER_REGISTRY_ADDRESS}/v2/","https://registry-1.docker.io"]
        [plugins."io.containerd.grpc.v1.cri".registry.mirrors."*"]
          endpoint = ["${DOCKER_REGISTRY_ADDRESS}/v2/"]
      [plugins."io.containerd.grpc.v1.cri".registry.configs]
        [plugins."io.containerd.grpc.v1.cri".registry.configs."${DOCKER_REGISTRY_ADDRESS}".auth]
            username = "${DOCKER_REGISTRY_USERNAME}"
            password = "${DOCKER_REGISTRY_PASSWORD}"
            auth = ""
            identitytoken = ""
    [plugins."io.containerd.grpc.v1.cri".x509_key_pair_streaming]
      tls_cert_file = ""
      tls_key_file = ""
  [plugins."io.containerd.internal.v1.opt"]
    path = "/opt/containerd"
  [plugins."io.containerd.internal.v1.restart"]
    interval = "10s"
  [plugins."io.containerd.metadata.v1.bolt"]
    content_sharing_policy = "shared"
  [plugins."io.containerd.monitor.v1.cgroups"]
    no_prometheus = false
  [plugins."io.containerd.runtime.v1.linux"]
    shim = "containerd-shim"
    runtime = "runc"
    runtime_root = ""
    no_shim = false
    shim_debug = false
  [plugins."io.containerd.runtime.v2.task"]
    platforms = ["linux/amd64"]
  [plugins."io.containerd.service.v1.diff-service"]
    default = ["walking"]
  [plugins."io.containerd.snapshotter.v1.devmapper"]
    root_path = ""
    pool_name = ""
    base_image_size = ""

Create a playbook to apply the config to the cluster.

cat <<EOF > registry.yaml
---
- hosts: node control-plane
  any_errors_fatal: true
  name: "add wildcard registry entry"
  gather_facts: false
  become: true
  strategy: linear

  tasks:
    - name: wait 360 for target connection to become reachable
      wait_for_connection:
        timeout: 360

    - name: copy containerd config
      template:
        src: config.toml
        dest: /etc/containerd/config.toml

    - name: restart containerd
      service:
        name: containerd
        state: restarted
        enabled: true
EOF

Replay the current /etc/containerd/config.toml onto the nodes, by running this command:
```
konvoy run playbook registry.yaml -y
```

Prepare Artifacts

NOTE: For upgrading Konvoy Image Builder version [v1.14.0](https://github.com/mesosphere/konvoy-image-builder/releases/tag/v1.14.0) should be used. Later versions will work; however, a containerd bundle must be provided in addition to the stated artifacts.

Follow the directions for loading the airgapped artifacts from Prerequisites when Air-Gapped.

Prepare Air-Gapped Cluster

Preparing an air-gapped cluster for upgrade

Patch containerd config

Prepare Artifacts

Patch `containerd` config