Added cassandra together with Wim

roles/cassandra/tasks/main.yml

@@ -0,0 +1,16 @@
+# Install a docker based cassandra cluster.
+---
+- include: ../common/tasks/docker.yml
+- name: install service file.
+  template:
+    src: templates/cassandra.service
+    dest: /etc/systemd/system/cassandra.service
+    mode: 644
+    owner: root
+    group: root
+- name: install service file
+  command: systemctl daemon-reload
+- name: make sure service is started
+  systemd:
+    name: cassandra.service
+    state: started

roles/cassandra/templates/cassandra.service

@@ -0,0 +1,19 @@
+[Unit]
+Description=Cassandra Container
+After=docker.service
+Requires=docker.service
+
+[Service]
+TimeoutStartSec=0
+Restart=always
+ExecStartPre=-/usr/bin/docker stop %n
+ExecStartPre=-/usr/bin/docker rm %n
+ExecStartPre=/usr/bin/docker pull cassandra:3.10
+ExecStart=/usr/bin/docker run --name %n -v /srv/lib/cassandra:/var/lib/cassandra \
+ -p 7000:7000 -p 7001:7001 -p 7199:7199 -p 9042:9042 -p 9160:9160 \
+ -e CASSANDRA_BROADCAST_ADDRESS={{ansible_default_ipv4.address}} \
+ -e CASSANDRA_START_RPC=True \
+ {{run_options}} cassandra:3.10
+
+[Install]
+WantedBy=multi-user.target