Initial implementation

.gitignore

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+.DS_Store
+*.pyc
+

Dockerfile

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+FROM cassandra:3.11.0
+
+# install wget unzip and dig plus python modules
+RUN set -ex \
+    && apt-get update \
+    && apt-get install --no-install-recommends -y wget unzip dnsutils python-dev gcc \
+    && wget --quiet -O /tmp/get-pip.py https://bootstrap.pypa.io/get-pip.py \
+    && python /tmp/get-pip.py \
+    && pip install \
+        # trying to use cqlsh to do this stuff, installing cassandra-driver takes _forever_
+        # cassandra-driver==3.12.0 \
+        python-Consul==0.7.2 \
+        manta==2.6.0 \
+        pyyaml==3.12 \
+    && apt-get purge -y python-dev gcc \
+    && rm /tmp/get-pip.py \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Consul
+# Releases at https://releases.hashicorp.com/consul
+RUN set -ex \
+    && export CONSUL_VERSION=1.0.1 \
+    && export CONSUL_CHECKSUM=eac5755a1d19e4b93f6ce30caaf7b3bd8add4557b143890b1c07f5614a667a68 \
+    && wget --quiet -O /tmp/consul.zip "https://releases.hashicorp.com/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_linux_amd64.zip" \
+    && echo "${CONSUL_CHECKSUM}  /tmp/consul.zip" | sha256sum -c \
+    && unzip /tmp/consul -d /usr/local/bin \
+    && rm /tmp/consul.zip \
+    && mkdir -p /etc/consul \
+    && mkdir -p /var/lib/consul \
+    && mkdir /config
+
+# Install Consul template
+# Releases at https://releases.hashicorp.com/consul-template/
+RUN set -ex \
+    && export CONSUL_TEMPLATE_VERSION=0.19.0 \
+    && export CONSUL_TEMPLATE_CHECKSUM=31dda6ebc7bd7712598c6ac0337ce8fd8c533229887bd58e825757af879c5f9f \
+    && wget --quiet -O /tmp/consul-template.zip "https://releases.hashicorp.com/consul-template/${CONSUL_TEMPLATE_VERSION}/consul-template_${CONSUL_TEMPLATE_VERSION}_linux_amd64.zip" \
+    && echo "${CONSUL_TEMPLATE_CHECKSUM}  /tmp/consul-template.zip" | sha256sum -c \
+    && unzip /tmp/consul-template.zip -d /usr/local/bin \
+    && rm /tmp/consul-template.zip
+
+# Add Containerpilot and set its configuration
+ENV CONTAINERPILOT /etc/containerpilot.json5
+ENV CONTAINERPILOT_VERSION 3.3.3
+
+RUN export CONTAINERPILOT_CHECKSUM=8d680939a8a5c8b27e764d55a78f5e3ae7b42ef4 \
+    && export archive=containerpilot-${CONTAINERPILOT_VERSION}.tar.gz \
+    && wget --quiet -O /tmp/${archive} \
+         "https://github.com/joyent/containerpilot/releases/download/${CONTAINERPILOT_VERSION}/${archive}" \
+    && echo "${CONTAINERPILOT_CHECKSUM}  /tmp/${archive}" | sha1sum -c \
+    && tar zxf /tmp/${archive} -C /usr/local/bin \
+    && rm /tmp/${archive}
+
+COPY etc/containerpilot.json5 /etc/containerpilot.json5
+
+### Cassandra-specific setup follows
+
+COPY etc/containerpilot_handler /usr/local/bin/containerpilot_handler
+COPY etc/containerpilot_handler.py /usr/local/bin/containerpilot_handler.py
+COPY etc/cassandra.yaml.ctmpl /etc/cassandra/cassandra.yaml.ctmpl
+
+# disable the automatic seed configuration that enables single-node bootstrapping
+# the first line corresponds to "always set self as seed"
+# the second line actually inserts CASSANDRA_SEEDS into the cassandra.yaml
+RUN sed -ri '/CASSANDRA_SEEDS.*CASSANDRA_BROADCAST_ADDRESS/d' /docker-entrypoint.sh && \
+    sed -ri '/sed -ri.*CASSANDRA_SEEDS.*\/cassandra.yaml/d' /docker-entrypoint.sh
+
+
+EXPOSE 7000 7001 7199 9042 9160
+
+ENTRYPOINT ["/usr/local/bin/containerpilot"]

README.md

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+# Autopilot Pattern Cassandra
+
+A blueprint for running Apache Cassandra using the [Autopilot Pattern](http://autopilotpattern.io/).
+
+Environment variables:
+
+  - `CASSANDRA_CLUSTER_NAME`: Name of cluster. Cassandra instances can only join a cluster with the
+  same `CASSANDRA_CLUSTER_NAME`. Changing this to something other than "Test Cluster"
+  is **strongly recommended**.
+  - `CASSANDRA_USER`: New user account to create upon cluster initialization. Setting this parameter
+  to something other than "cassandra" is **strongly recommended**.
+  - `CASSANDRA_PASSWORD`: password for `CASSANDRA_USER`.
+  - `CASSANDRA_KEYSPACES`: Comma-seperated list of keyspaces.
+  - `CASSANDRA_TOPOLOGY`: JSON map describing keyspaces and their respective datacenters and
+    replication factors, e.g. for a cluster deployed with at least 2 nodes in `us-east-1` and
+    `us-sw-1` Triton datacenters having a single keyspace named `demo`:
+    ```
+    { "demo": { "us-sw-1": 2 }, { "us-east-1": 2 } }
+    ```
+
+Notes:
+
+```
+cd examples/compose
+docker-compose up -d --scale cassandra=3
+# for a cqlsh shell:
+docker-compose exec cassandra cqlsh cassandra
+
+cqlsh> CREATE KEYSPACE demo WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': 2 };
+USE demo;
+
+```