Add compute node deployment script

This commit adds pretty simple script which makes possible to simply
deploy new compute node with just single command. It also allows
deployer to define pre and post tasks to be runned in case some
customization is needed.

Change-Id: I00031eb7e7d6cd9b9fe86b5c649ddd6f64630ffe

doc/source/admin/scale-environment.rst

@@ -103,6 +103,20 @@ cluster.
        # ansible nova_all -m setup -a 'filter=ansible_local gather_subset="!all"'
        # openstack-ansible setup-openstack.yml --limit localhost,NEW_HOST_NAME
 
+   Alternatively you can try using new compute nodes deployment script
+   ``/opt/openstack-ansible/scripts/add-compute.sh``.
+
+   You can provide this script with extra tasks that will be executed
+   before or right after OSA roles. To do so you should set environment
+   variables ``PRE_OSA_TASKS`` or ``POST_OSA_TASKS`` with plays to run devided
+   with semicolon:
+
+   .. code-block:: shell-session
+
+      # export POST_OSA_TASKS="/opt/custom/setup.yml --limit HOST_NAME;/opt/custom/tasks.yml --tags deploy"
+      # /opt/openstack-ansible/scripts/add-compute.sh HOST_NAME,HOST_NAME_2
+
+
 Test new compute nodes
 ~~~~~~~~~~~~~~~~~~~~~~
 

scripts/add-compute.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+
+# Copyright 2020, VEXXHOST, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+export OSA_REPO_PATH=${OSA_REPO_PATH:-"/opt/openstack-ansible"}
+export HOSTS=${1:-""}
+
+function define_tasks {
+
+    if [[ ! -z ${PRE_OSA_TASKS} ]]; then
+        if [ "${BASH_VERSINFO[0]}" -ge 4 ] && [ "${BASH_VERSINFO[1]}" -ge 4 ]; then
+            readarray -td";" PRE_TASKS <<<"$PRE_OSA_TASKS"
+        else
+            readarray -t PRE_TASKS <<<"$(echo "$PRE_OSA_TASKS" | tr ';' '\n')"
+        fi
+        for i in ${!PRE_TASKS[@]}; do
+            RUN_TASKS+=("${PRE_TASKS[$i]}")
+        done
+    fi
+
+    RUN_TASKS+=("${OSA_REPO_PATH}/playbooks/setup-hosts.yml --limit ${HOSTS}")
+    RUN_TASKS+=("${OSA_REPO_PATH}/playbooks/setup-openstack.yml --limit ${HOSTS}")
+    RUN_TASKS+=("${OSA_REPO_PATH}/playbooks/openstack-hosts-setup.yml --tags openstack_hosts-config")
+    RUN_TASKS+=("${OSA_REPO_PATH}/playbooks/unbound-install.yml --tags unbound-config")
+    RUN_TASKS+=("${OSA_REPO_PATH}/playbooks/os-nova-install.yml --tags nova-key --limit nova_compute")
+
+    if [[ ! -z ${POST_OSA_TASKS} ]]; then
+        if [ "${BASH_VERSINFO[0]}" -ge 4 ] && [ "${BASH_VERSINFO[1]}" -ge 4 ]; then
+            readarray -td";" POST_TASKS <<<"$POST_OSA_TASKS"
+        else
+            readarray -t POST_TASKS <<<"$(echo "$POST_OSA_TASKS" | tr ';' '\n')"
+        fi
+        for i in ${!POST_TASKS[@]}; do
+            RUN_TASKS+=("${POST_TASKS[$i]}")
+        done
+    fi
+}
+
+function run_tasks {
+    set +e
+    for item in ${!RUN_TASKS[@]}; do
+        eval "echo openstack-ansible ${RUN_TASKS[$item]}"
+        playbook_status="$?"
+        if [[ ${playbook_status} -gt 0 ]]; then
+            echo "*********************** failure ************************"
+            echo "The compute deployment script has encountered a failure."
+            echo "Failed on task \"${RUN_TASKS[$item]}\" with status $playbook_status"
+            echo "Re-run the script, or execute tasks manually:"
+            for item in $(seq $item $((${#RUN_TASKS[@]} - 1))); do
+                if [ -n "${RUN_TASKS[$item]}" ]; then
+                    echo "openstack-ansible ${RUN_TASKS[$item]}"
+                fi
+            done
+            echo "*********************** failure ************************"
+            exit ${playbook_status}
+        # else
+        #     echo "task ${RUN_TASKS[$item]} ran successfully"
+        fi
+    done
+    set -e
+}
+
+function main {
+    if [[ -z ${HOSTS} ]]; then
+        echo "Hosts to setup are not provided"
+        exit 1
+    elif [[ ! -d ${OSA_REPO_PATH} ]]; then
+        echo "OSA repo is not found: ${OSA_REPO_PATH}. Define OSA_REPO_PATH to set another directory"
+        exit 1
+    fi
+
+    define_tasks
+    run_tasks
+}
+
+main