Deploying Redis Sentinel with Portainer and Integrating It into Spring Boot

The author introduces Portainer as a convenient Docker graphical management tool and outlines the steps to install it using a simple portainer.yml Docker‑Compose file.

After launching Portainer with docker-compose -f portainer.yml up -d , the UI is accessed via http:// :9000 where users can manage containers, images, and networks.

As a practical example, the article demonstrates deploying a Redis Sentinel architecture (one master, two slaves, three sentinel nodes) entirely through Portainer.

First, a redis-cluster.yml file defines the master and two slave services, specifying custom external ports and password‑protected commands; the stack is started with docker-compose -f redis-cluster.yml up and verified in Portainer’s container list.

Next, a custom bridge network named redis-sentinel is created via Portainer’s Network UI and the Redis containers are attached to it, isolating the sentinel topology from other workloads.

A separate redis-sentinel.yml file defines three sentinel services, each mounting its own sentinel.conf and joining the redis-sentinel network; the sentinel configuration includes monitoring the master’s IP, authentication, and failover parameters.

Failover is tested by stopping the master container through the Portainer UI; the remaining sentinels automatically elect a new master, which can be observed in their logs.

For application integration, the guide adds spring-boot-starter-data-redis and commons-pool2 (Lettuce pool) dependencies, then configures spring.redis.sentinel properties (master name, node addresses, passwords) and Lettuce pool settings in application.yml .

Sample Java code shows the LettuceConnectionFactory bean creation path, the RedisTemplate injection, a simple DTO ( RedisStrDto ), and REST endpoints ( /setKey and /getKey/{key} ) for storing and retrieving string values.

Finally, API calls are demonstrated to verify that data written to the master is correctly replicated to the slaves and that the Spring Boot service can interact with the Redis Sentinel cluster without issues.