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Setup dev environment by kind

This scripts is to setup an OCM developer environment in your local machine with 3 kind clusters. The script will bootstrap 3 kind clusters on your local machine: hub, cluster1, and cluster2. The hub is used as the control plane of the OCM, and the other two clusters are registered on the hub as the managed clusters.

Prerequisite

kind must be installed on your local machine. The Kubernetes version must be >= 1.19, see kind user guide for more details.

Download and install clusteradm. For Linux OS, run the following commands:

wget -qO- https://github.com/open-cluster-management-io/clusteradm/releases/latest/download/clusteradm_linux_amd64.tar.gz | sudo tar -xvz -C /usr/local/bin/

sudo chmod +x /usr/local/bin/clusteradm

Setup the clusters

Run ./local-up.sh, you will see two clusters registered on the hub cluster.

NAME       HUB ACCEPTED   MANAGED CLUSTER URLS      JOINED   AVAILABLE   AGE
cluster1   true           https://127.0.0.1:45325   True     True        116s
cluster2   true           https://127.0.0.1:45325   True     True        98s
Known issue when running the setup script on a Linux environment

You may run into this issue when trying to create multiple clusters

Creating cluster "cluster2" ...
✓ Ensuring node image (kindest/node:v1.26.3) 🖼
✗ Preparing nodes 📦  
ERROR: failed to create cluster: could not find a log line that matches "Reached target .*Multi-User System.*|detected cgroup v1

This might be caused by kernel limits such as number of open files, inotifiy watches, etc. To solve this, try increasing your max_user_instances and max_user_watches:

  • To see the current limits 
    $ cat /proc/sys/fs/inotify/max_user_watches
$ cat /proc/sys/fs/inotify/max_user_instances
  • To temporarily increase the limits 
    $ sudo sysctl fs.inotify.max_user_instances=8192
$ sudo sysctl fs.inotify.max_user_watches=524288
$ sudo sysctl -p
  • To permanently increase the limits 
    $ sudo echo "fs.inotify.max_user_watches=1024" >> /etc/sysctl.conf
$ sudo echo "fs.inotify.max_user_instances=1024" >> /etc/sysctl.conf
$ sudo sysctl -p /etc/sysctl.conf #reloads system settings to apply changes

Once you've increased the limits, delete the clusters already created and try again:

$ kind delete clusters hub cluster1 cluster2
$ ./setup-ocm.sh