kind infra, present ensure_memory_dir_for_etcd_data

In order to run etcd in memory it is necessary
to create tmpfs mount to back the directory that
will be mounted to KIND cluster node.

'ensure_memory_dir_for_etcd_data' function
ensures that the directory '$ETCD_DATA_DIR'
exists, empty, and mounted as tmpfs.

'cleanup_dir_for_etcd_data' will teardown
the mount and directory that created by
'ensure_memory_dir_for_etcd_data'
It will be invoked by 'make cluster-down'

Signed-off-by: Or Mergi <[email protected]>

cluster-up/cluster/kind/common.sh

@@ -15,6 +15,8 @@ REGISTRY_NAME=${CLUSTER_NAME}-registry
 MASTER_NODES_PATTERN="control-plane"
 WORKER_NODES_PATTERN="worker"
 
+ETCD_DATA_DIR=${ETCD_DATA_DIR:-none}
+
 function _wait_kind_up {
     echo "Waiting for kind to be ready ..."
     while [ -z "$(docker exec --privileged ${CLUSTER_NAME}-control-plane kubectl --kubeconfig=/etc/kubernetes/admin.conf get nodes --selector=node-role.kubernetes.io/master -o=jsonpath='{.items..status.conditions[-1:].status}' | grep True)" ]; do
@@ -192,6 +194,44 @@ function setup_kind() {
     prepare_config
 }
 
+function ensure_memory_dir_for_etcd_data() {
+    if [ "$ETCD_DATA_DIR" == none ];then
+        echo "ETCD_DATA_DIR is not defined"
+        exit 1
+    fi
+
+    if grep -qs $ETCD_DATA_DIR /proc/mounts; then
+        echo "etcd data mount already exists"
+        df -h $ETCD_DATA_DIR
+        if [ -d "$ETCD_DATA_DIR" ];then
+            echo "ectd data directory already exists, cleaning up directory content..."
+            rm -rf $ETCD_DATA_DIR/*
+            df -h $ETCD_DATA_DIR
+        fi
+    else
+        echo "creating directory for ectd data"
+        mkdir -p $ETCD_DATA_DIR
+        [ "$(echo $?)" != 0 ] && echo "failed to create etcd data directory" && exit 1
+        ls -lsah $ETCD_DATA_DIR
+
+        echo "mount etcd data directory as tempfs"
+        mount -t tmpfs tmpfs $ETCD_DATA_DIR
+        [ "$(echo $?)" != 0 ] && echo "failed to mount etcd data directory" && exit 1
+        df -h $ETCD_DATA_DIR
+    fi
+}
+
+function cleanup_dir_for_etcd_data() {
+    if grep -qs $ETCD_DATA_DIR /proc/mounts; then
+        umount -f $ETCD_IN_MEMORY &> 1
+        [ "$(echo $?)" == 0 ] && echo "etcd data directory umounted"
+    fi
+    if [ -d "$ETCD_DATA_DIR" ];then
+        rm -rf $ETCD_IN_MEMORY
+        echo "etcd data directory deleted"
+    fi
+}
+
 function _add_worker_extra_mounts() {
     if [[ "$KUBEVIRT_PROVIDER" =~ sriov.* ]]; then
         cat <<EOF >> ${KUBEVIRTCI_CONFIG_PATH}/$KUBEVIRT_PROVIDER/kind.yaml
@@ -254,4 +294,8 @@ function down() {
     fi
     $KIND delete cluster --name=${CLUSTER_NAME}
     rm -f ${KUBEVIRTCI_CONFIG_PATH}/$KUBEVIRT_PROVIDER/kind.yaml
+
+    if [ "$ETCD_DATA_DIR" != none];then
+        cleanup_dir_for_etcd_data
+    fi
 }