snapshot of https://github.com/centrifugal/centrifugo.git (master, 2026-09-16; blobs > 131072B omitted)

misc/redis_sentinel/readme.md

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+Create local Sentinel based Redis setup consisting of 1 Sentinel and 3 Redis nodes (master, 2 replicas). Note, in production you need at least 3 Sentinels for high availability.
+
+## Run
+
+```
+bash start.sh
+```
+
+## Emulate failover
+
+Connect to Sentinel:
+
+```
+redis-cli -p 26379
+```
+
+And run:
+
+```
+sentinel failover mymaster
+```

misc/redis_sentinel/start.sh

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+#!/bin/bash
+
+# Function to wait for Redis node to become available
+wait_for_redis() {
+  local port=$1
+  while ! redis-cli -p "$port" ping > /dev/null 2>&1; do
+    echo "Waiting for Redis node on port $port to start..."
+    sleep 1
+  done
+  echo "Redis node on port $port is available."
+}
+
+# Array to hold PIDs of Redis server processes
+declare -a redis_pids
+
+# Function to start Redis Sentinel setup
+start_redis_sentinel() {
+  local base_port=7000
+  local sentinel_port=26379
+  local data_dir="./sentinel_data"
+
+  # Clean up previous setup
+  rm -rf "$data_dir"
+  mkdir -p "$data_dir"
+
+  # Start the master node
+  local master_port=$((base_port))
+  local master_dir="$data_dir/master"
+  mkdir -p "$master_dir"
+  pushd "$master_dir" > /dev/null
+  redis-server --port "$master_port" --save "" --appendonly no --dbfilename "dump.rdb" --logfile "redis.log" &
+  local pid=$!
+  redis_pids+=($pid)
+  echo "Master started on port $master_port with PID $pid"
+  popd > /dev/null
+
+  # Start the replicas
+  for i in 1 2; do
+    local replica_port=$((base_port + i))
+    local replica_dir="$data_dir/replica_$i"
+    mkdir -p "$replica_dir"
+    pushd "$replica_dir" > /dev/null
+    redis-server --port "$replica_port" --slaveof 127.0.0.1 "$master_port" --save "" --appendonly no --dbfilename "dump.rdb" --logfile "redis.log" &
+    pid=$!
+    redis_pids+=($pid)
+    echo "Replica $i started on port $replica_port with PID $pid"
+    popd > /dev/null
+  done
+
+  # Wait for all nodes to become available
+  wait_for_redis "$master_port"
+  for i in 1 2; do
+    wait_for_redis $((base_port + i))
+  done
+
+  # Start Redis Sentinel
+  local sentinel_dir="$data_dir/sentinel"
+  mkdir -p "$sentinel_dir"
+  pushd "$sentinel_dir" > /dev/null
+
+  cat <<EOF > sentinel.conf
+port $sentinel_port
+sentinel monitor mymaster 127.0.0.1 $master_port 1
+sentinel down-after-milliseconds mymaster 5000
+sentinel failover-timeout mymaster 10000
+sentinel parallel-syncs mymaster 1
+EOF
+
+  redis-server sentinel.conf --sentinel &
+  pid=$!
+  redis_pids+=($pid)
+  echo "Sentinel started on port $sentinel_port with PID $pid"
+  popd > /dev/null
+}
+
+# Function to shut down Redis nodes and Sentinel
+shutdown_redis_sentinel() {
+  echo "Shutting down Redis nodes and Sentinel..."
+  for pid in "${redis_pids[@]}"; do
+    kill "$pid"
+    echo "Stopped process with PID $pid"
+  done
+}
+
+# Trap Ctrl+C (SIGINT) to call shutdown function
+trap shutdown_redis_sentinel SIGINT
+
+# Start the Redis Sentinel setup
+start_redis_sentinel
+
+# Wait until a keyboard interrupt (Ctrl+C) is detected
+echo "Redis Sentinel setup is running. Press Ctrl+C to stop."
+echo "All PIDs: ${redis_pids[*]}"
+wait