Add support for specifying image (#40)

Author: mnasiadka

roles/cephadm/README.md

@@ -36,6 +36,7 @@ All Ceph hosts must be in the `ceph` group.
     * `cephadm_enable_dashboard`: If enabled - dashboard service on MGR will be enabled (default: False)
     * `cephadm_enable_firewalld`: If enabled - firewalld will be installed and rules will be applied (default: False)
     * `cephadm_enable_monitoring`: If enabled - cephadm monitoring stack will be deployed i.e. prometheus/node-exporters/grafana (default: False)
+    * `cephadm_image`: If set - cephadm will use this image
     * `cephadm_install_ceph_cli`: If enabled - ceph cli will be installed on the hosts (default: False)
     * `cephadm_ssh_public_key`: Location where ssh public key used by cephadm will be saved (default: /etc/ceph/cephadm.pub)
     * `cephadm_ssh_private_key`: Location where ssh private key used by cephadm will be saved (default: /etc/ceph/cephadm.id)

roles/cephadm/defaults/main.yml

@@ -8,6 +8,8 @@ cephadm_recreate: False
 # Packages
 cephadm_custom_repos: False
 cephadm_package_update: False
+# Image
+cephadm_image: ""
 # Registry
 cephadm_registry_url: ""
 cephadm_registry_username: ""

roles/cephadm/tasks/bootstrap.yml

@@ -9,7 +9,11 @@
       firewalld: "{{ '--skip-firewalld' if not cephadm_enable_firewalld | bool else '' }}"
     command:
       cmd: >
-           cephadm bootstrap
+           cephadm
+           {% if cephadm_image | length > 0 %}
+           --image={{ cephadm_image }}
+           {% endif %}
+           bootstrap
            {{ monitoring_stack }}
            {{ dashboard }}
            {{ firewalld }}