diff --git a/microcloud/test/main.sh b/microcloud/test/main.sh
index 8be4628b1..c5972f20c 100755
--- a/microcloud/test/main.sh
+++ b/microcloud/test/main.sh
@@ -144,6 +144,7 @@ if [ "${1:-"all"}" != "cluster" ]; then
   run_test test_add_interactive "add interactive"
   run_test test_add_auto "add auto"
   run_test test_preseed "preseed"
+  run_test test_reuse_cluster "reuse_cluster"
 fi
 
 # shellcheck disable=SC2034
diff --git a/microcloud/test/suites/basic.sh b/microcloud/test/suites/basic.sh
index 794af4d68..d3143217e 100644
--- a/microcloud/test/suites/basic.sh
+++ b/microcloud/test/suites/basic.sh
@@ -681,3 +681,133 @@ test_auto() {
     ! lxc exec ${m} -- sh -c "lxc network ls -f csv" | grep -q "^UPLINK," || false
   done
 }
+
+# services_validator: A basic validator of 3 systems with typical expected inputs.
+services_validator() {
+  for m in micro01 micro02 micro03 ; do
+    validate_system_lxd ${m} 3 disk1 1 1 enp6s0 10.1.123.1/24 10.1.123.100-10.1.123.254 fd42:1:1234:1234::1/64 10.1.123.1,8.8.8.8
+    validate_system_microceph ${m} 1 disk2
+    validate_system_microovn ${m}
+  done
+}
+
+test_reuse_cluster() {
+  # Set the default config for interactive setup.
+  export LOOKUP_IFACE="enp5s0"
+  export LIMIT_SUBNET="yes"
+  export EXPECT_PEERS=2
+  export SETUP_ZFS="yes"
+  export ZFS_FILTER="lxd_disk1"
+  export ZFS_WIPE="yes"
+  export SETUP_CEPH="yes"
+  export SETUP_CEPHFS="yes"
+  export CEPH_FILTER="lxd_disk2"
+  export CEPH_WIPE="yes"
+  export SETUP_OVN="yes"
+  export OVN_FILTER="enp6s0"
+  export IPV4_SUBNET="10.1.123.1/24"
+  export IPV4_START="10.1.123.100"
+  export IPV4_END="10.1.123.254"
+  export CUSTOM_DNS_ADDRESSES="10.1.123.1,8.8.8.8"
+  export IPV6_SUBNET="fd42:1:1234:1234::1/64"
+
+  reset_systems 3 3 3
+  echo Create a MicroCloud that re-uses an existing service
+  export REUSE_EXISTING_COUNT=1
+  export REUSE_EXISTING="reuse"
+  lxc exec micro02 -- microceph cluster bootstrap
+  microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out"
+  services_validator
+
+  reset_systems 3 3 3
+  echo Create a MicroCloud that re-uses an existing service on the local node
+  lxc exec micro01 -- microceph cluster bootstrap
+  microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out"
+  services_validator
+
+  reset_systems 3 3 3
+  echo Create a MicroCloud that re-uses an existing MicroCeph and MicroOVN
+  export REUSE_EXISTING_COUNT=2
+  export REUSE_EXISTING="reuse"
+  lxc exec micro02 -- microceph cluster bootstrap
+  lxc exec micro02 -- microovn cluster bootstrap
+  microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out"
+  services_validator
+
+  reset_systems 3 3 3
+  echo Create a MicroCloud that re-uses an existing MicroCeph and MicroOVN on different nodes
+  lxc exec micro02 -- microceph cluster bootstrap
+  lxc exec micro03 -- microovn cluster bootstrap
+  microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out"
+  services_validator
+
+  reset_systems 3 3 3
+  echo Create a MicroCloud that re-uses an existing existing service with multiple nodes from this cluster
+  export REUSE_EXISTING_COUNT=1
+  export REUSE_EXISTING="reuse"
+  lxc exec micro02 -- microceph cluster bootstrap
+  token="$(lxc exec micro02 -- microceph cluster add micro01)"
+  lxc exec micro01 -- microceph cluster join "${token}"
+  microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out"
+  services_validator
+
+  reset_systems 3 3 3
+  echo Create a MicroCloud that re-uses an existing existing service with all nodes from this cluster
+  lxc exec micro02 -- microceph cluster bootstrap
+  token="$(lxc exec micro02 -- microceph cluster add micro01)"
+  lxc exec micro01 -- microceph cluster join "${token}"
+  token="$(lxc exec micro02 -- microceph cluster add micro03)"
+  lxc exec micro03 -- microceph cluster join "${token}"
+  microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out"
+  services_validator
+
+  reset_systems 4 3 3
+  echo Create a MicroCloud that re-uses an existing existing service with foreign cluster members
+  lxc exec micro04 -- snap disable microcloud
+  lxc exec micro02 -- microceph cluster bootstrap
+  token="$(lxc exec micro02 -- microceph cluster add micro04)"
+  lxc exec micro04 -- microceph cluster join "${token}"
+  microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out"
+  services_validator
+  validate_system_microceph micro04 1
+
+  reset_systems 3 3 3
+  echo Fail to create a MicroCloud due to an existing service if --auto specified
+  lxc exec micro02 -- microceph cluster bootstrap
+  ! lxc exec micro01 -- sh -c "TEST_CONSOLE=0 microcloud init --auto > out" || true
+
+
+
+  echo Fail to create a MicroCloud due to conflicting existing services
+  lxc exec micro03 -- microceph cluster bootstrap
+  ! microcloud_interactive | lxc exec micro01 -- sh -c "microcloud init > out" || true
+
+  reset_systems 3 3 3
+  echo Create a MicroCloud that re-uses an existing service with preseed
+  addr=$(lxc ls micro01 -f csv -c4 | grep enp5s0 | cut -d' ' -f1)
+  lxc exec micro01 -- sh -c "
+  cat << EOF > /root/preseed.yaml
+lookup_subnet: ${addr}/24
+lookup_interface: enp5s0
+reuse_existing_clusters: true
+systems:
+- name: micro01
+- name: micro02
+- name: micro03
+ovn:
+  ipv4_gateway: 10.1.123.1/24
+  ipv4_range: 10.1.123.100-10.1.123.254
+  ipv6_gateway: fd42:1:1234:1234::1/64
+  dns_servers: 10.1.123.1,8.8.8.8
+storage:
+  local:
+    - find: id == sdb
+      wipe: true
+  ceph:
+    - find: id == sdc
+      wipe: true
+  cephfs: true
+"
+  lxc exec micro01 -- sh -c "cat /root/preseed.yaml | TEST_CONSOLE=0 microcloud init --preseed"
+  services_validator
+}