Example of building a redis-sentinel cluster based on docker

#Port number port 26379
dir /tmp
# mymaster: custom cluster name, 2: voting quantity must be 2 sentinels to determine whether the master node fails sentinel monitor mymaster <ip> <port> 2
# If the master node is unreachable after more than 5000 seconds and there is no reply, sentinel down-after-milliseconds mymaster 5000
# Indicates that at most numslaves are updating the new master synchronously during failover
sentinel parallel-syncs mymaster 1
# Failover timeout sentinel failover-timeout mymaster 5000

#Port number port 26380
dir /tmp
# mymaster: custom cluster name, 2: voting quantity must be 2 sentinels to determine whether the master node fails sentinel monitor mymaster <ip> <port> 2
# If the master node is unreachable after more than 5000 seconds and there is no reply, sentinel down-after-milliseconds mymaster 5000
# Indicates that at most numslaves are updating the new master synchronously during failover
sentinel parallel-syncs mymaster 1
# Failover timeout sentinel failover-timeout mymaster 5000

#Port number port 26381
dir /tmp
# mymaster: custom cluster name, 2: voting quantity must be 2 sentinels to determine whether the master node fails sentinel monitor mymaster <ip> <port> 2
# If the master node is unreachable after more than 5000 seconds and there is no reply, sentinel down-after-milliseconds mymaster 5000
# Indicates that at most numslaves are updating the new master synchronously during failover
sentinel parallel-syncs mymaster 1
# Failover timeout sentinel failover-timeout mymaster 5000

version: '2'
services:
 master:
 image: redis:4.0
 restart: always
 container_name: redis-master
 #Use host network network_mode: "host"
 command: redis-server --port 16379 
 
 slave1:
 image: redis:4.0
 restart: always
 container_name: redis-slave-1
 network_mode: "host"
 # Specify the port and specify the master ip port command: redis-server --port 16380 --slaveof <master ip> 16379
 
 slave2:
 image: redis:4.0
 restart: always
 container_name: redis-slave-2
 network_mode: "host" 
 command: redis-server --port 16381 --slaveof <master ip> 16379
 
 sentinel1:
 image: redis:4.0
 restart: always
 container_name: redis-sentinel-1
 network_mode: "host"
 # Specify the sentinel file location command: redis-sentinel /usr/local/etc/redis/sentinel.conf
 # Use the data volume to map the file to the specified sentinel location volumes:
  - ./sentinel/sentinel1.conf:/usr/local/etc/redis/sentinel.conf
 
 sentinel2:
 image: redis:4.0
 restart: always
 container_name: redis-sentinel-2
 network_mode: "host" 
 command: redis-sentinel /usr/local/etc/redis/sentinel.conf
 volumes:
  - ./sentinel/sentinel2.conf:/usr/local/etc/redis/sentinel.conf
 
 sentinel3:
 image: redis:4.0
 restart: always
 container_name: redis-sentinel-3
 network_mode: "host" 
 command: redis-sentinel /usr/local/etc/redis/sentinel.conf
 volumes:
  - ./sentinel/sentinel3.conf:/usr/local/etc/redis/sentinel.conf