Adding a worker node (IBM Cloud Pak for AIOps on Linux)

Learn how to add a worker node to a Linux® cluster that has a deployment of IBM Cloud Pak® for AIOps running on it.

Procedure

Set environment variables.
1. Run the following command to source the shell script aiops_var.sh that you created when you installed IBM Cloud Pak for AIOps on your Linux cluster.
```
. ./aiops_var.sh
```
  For more information about aiops_var.sh, see Create environment variables in Online installation of IBM Cloud Pak for AIOps on Linux or Offline installation of IBM Cloud Pak for AIOps on Linux.
2. Set an environment variable for the new worker node that you want to add.
```
export NEW_WORKER_NODE="<new_worker_node>"
```
  Where <new_worker_node> is the FQDN or IP address of the worker node to be added, for example agent8.acme.com.

Run the following commands to configure your new worker node.

For online deployments:

K3S_TOKEN=$(ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} aiopsctl cluster node info --token-only)
K3S_HOST="https://${LOAD_BALANCER_HOST}:6443"

ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} ssh ${TARGET_USER}@${NEW_WORKER_NODE} curl -LO "${AIOPSCTL_INSTALL_URL}"
ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} ssh ${TARGET_USER}@${NEW_WORKER_NODE} tar xvf "${AIOPSCTL_TAR}"
ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} ssh ${TARGET_USER}@${NEW_WORKER_NODE} mv aiopsctl /usr/local/bin/aiopsctl
ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} ssh ${TARGET_USER}@${NEW_WORKER_NODE} aiopsctl cluster node up --accept-license=${ACCEPT_LICENSE} --role=worker --server-url="${K3S_HOST}" --token="${K3S_TOKEN}" --registry-token="${IBM_ENTITLEMENT_KEY}" --app-storage "${APP_STORAGE_PATH}"

For offline deployments:

K3S_TOKEN=$(ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} aiopsctl cluster node info --token-only)
K3S_HOST="https://${LOAD_BALANCER_HOST}:6443"

ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} scp -r ~/.aiopsctl ${TARGET_USER}@${NEW_WORKER_NODE}:~/.aiopsctl/
ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} scp /usr/local/bin/aiopsctl ${TARGET_USER}@${NEW_WORKER_NODE}:/usr/local/bin/aiopsctl
ssh ${TARGET_USER}@${CONTROL_PLANE_NODE} ssh ${TARGET_USER}@${NEW_WORKER_NODE} aiopsctl cluster node up --accept-license=${ACCEPT_LICENSE} --role=worker --server-url="${K3S_HOST}" --token="${K3S_TOKEN}" --registry="${TARGET_REGISTRY}" --registry-user="${TARGET_REGISTRY_USER}" --registry-token="${TARGET_REGISTRY_PASSWORD}" --app-storage "${APP_STORAGE_PATH}" --offline --insecure-skip-tls-verify="${SKIP_TLS}"

Update the environment variables script aiops_var.sh.

When your worker node is succesfully added and configured, add an entry for it to the WORKER_NODES array for the new control plane node. This is to maintain the accuracy of the environment variables file.