hazelcast-kill-2-out-of-7-docker.sh

#!/bin/bash

# define Hazelcast configuration in YAML file (TCP discovery used, REST API enabled)
cat <<EOT >hazelcast.yaml
hazelcast:
  network:
    join:
      multicast:
        enabled: false
      tcp-ip:
        enabled: true
        member-list:
          - "172.17.0.2:5701"
          - "172.17.0.3:5701"
          - "172.17.0.4:5701"
          - "172.17.0.5:5701"
    rest-api:
      enabled: true
      endpoint-groups:
        CLUSTER_READ:
          enabled: true
        CLUSTER_WRITE:
          enabled: true
        HEALTH_CHECK:
          enabled: true
        DATA:
          enabled: true
EOT

# start 7 Hazelcast members in Docker
for i in {1..7}; do
  # mount current directory as /mnt in the container so we can link the configuration file
  docker run -v `pwd`:/mnt -d --rm  --name member$i -e JAVA_OPTS=-Dhazelcast.config=/mnt/hazelcast.yaml hazelcast/hazelcast:3.12.6
done

# give Hazelcast time to establish the cluster
sleep 15

# check member list views
for i in {1..7}; do
  curl -m 2 http://172.17.0.$((i+1)):5701/hazelcast/rest/cluster
done

# kill (SIGKILL) 2 members
docker kill member3 member5

# give Hazelcast time to realize some members are missing in the cluster
sleep 60

# check member list views again
for i in {1..7}; do
  curl -m 2 http://172.17.0.$((i+1)):5701/hazelcast/rest/cluster
done

# cleanup
for i in {1..7}; do
  docker kill member$i
done