Redis复制-解析主机名失败

Question

我正在尝试建立一个带有3个redis服务器(1个主服务器和2个副本)和3个redis哨兵的redis复制集群。一个服务器和数据库对将存在于一台机器上，并且有3台机器，每台机器都安装了对接器。我遇到的问题是，redis服务器实例无法连接到主服务器并解决主名称。网络或端口打开似乎没有任何问题，因为我能够在下面的配置中指定每台机器IPv4，并且通信按预期工作。

更低的日志中提供的Redis版本

docker-compose version 1.29.2, build 5becea4c
Docker version 20.10.14, build a224086
Ubuntu 20.04.4 LTS

下面是docker-compose.yml文件：

我没有包含redis_3配置和输出，因为它几乎与redis_2相同。

小学：

version: '3.8'

services:
  redis_1:
    image: bitnami/redis:6.2
    restart: always
    command: ["redis-server", "--protected-mode", "no", "--dir", "/data"]
    environment:
      - REDIS_REPLICA_IP=redis_1
      - REDIS_REPLICATION_MODE=master
      - REDIS_MASTER_PASSWORD=very-good-password
      - REDIS_PASSWORD=very-good-password
    ports:
     - "6379:6379"
    volumes:
      - "/opt/knowit/docker/data:/data"
  sentinel_1:
    image: bitnami/redis-sentinel:6.2
    restart: always
    environment:
      - REDIS_MASTER_HOST=redis_1
      - REDIS_MASTER_PASSWORD=very-good-password
      - REDIS_SENTINEL_ANNOUNCE_IP=redis_1
      - REDIS_SENTINEL_QUORUM=2
      - REDIS_SENTINEL_DOWN_AFTER_MILLISECONDS=5000
      - REDIS_SENTINEL_FAILOVER_TIMEOUT=60000
      - REDIS_SENTINEL_PASSWORD=other-good-password
      - REDIS_SENTINEL_ANNOUNCE_HOSTNAMES=yes
      - REDIS_SENTINEL_RESOLVE_HOSTNAMES=yes
    ports:
      - "26379:26379"

复制品：

version: '3.8'

services:
  redis_2:
    image: bitnami/redis:6.2
    restart: always
    command: ["redis-server", "--protected-mode", "no", "--replicaof", "redis_1", "6379", "--dir", "/data"]
    environment:
      - REDIS_REPLICA_IP=redis_2
      - REDIS_REPLICATION_MODE=replica
      - REDIS_MASTER_PASSWORD=very-good-password
      - REDIS_PASSWORD=very-good-password
    ports:
      - "6379:6379"
    volumes:
      - "/opt/knowit/docker/data:/data"
  sentinel_2:
    image: bitnami/redis-sentinel:6.2
    restart: always
    environment:
      - REDIS_MASTER_HOST=redis_1
      - REDIS_MASTER_PASSWORD=very-good-password
      - REDIS_SENTINEL_ANNOUNCE_IP=redis_2
      - REDIS_SENTINEL_QUORUM=2
      - REDIS_SENTINEL_DOWN_AFTER_MILLISECONDS=5000
      - REDIS_SENTINEL_FAILOVER_TIMEOUT=60000
      - REDIS_SENTINEL_PASSWORD=other-good-password
      - REDIS_SENTINEL_ANNOUNCE_HOSTNAMES=yes
      - REDIS_SENTINEL_RESOLVE_HOSTNAMES=yes
    ports:
      - "26379:26379"

码头日志如下所示：

小学：

$ sudo docker-compose up
Starting docker_redis_1    ... done
Starting docker_sentinel_1 ... done
Attaching to docker_redis_1, docker_sentinel_1
redis_1     | redis 12:15:41.03 
redis_1     | redis 12:15:41.04 Welcome to the Bitnami redis container
redis_1     | redis 12:15:41.04 Subscribe to project updates by watching https://github.com/bitnami/bitnami-docker-redis
redis_1     | redis 12:15:41.04 Submit issues and feature requests at https://github.com/bitnami/bitnami-docker-redis/issues
redis_1     | 
redis_1     | redis 12:15:41.04 
redis_1     | 1:C 29 Apr 2022 12:15:41.068 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_1     | 1:C 29 Apr 2022 12:15:41.069 # Redis version=6.2.7, bits=64, commit=00000000, modified=0, pid=1, just started
redis_1     | 1:C 29 Apr 2022 12:15:41.069 # Configuration loaded
redis_1     | 1:M 29 Apr 2022 12:15:41.070 * monotonic clock: POSIX clock_gettime
redis_1     | 1:M 29 Apr 2022 12:15:41.072 # A key '__redis__compare_helper' was added to Lua globals which is not on the globals allow list nor listed on the deny list.
redis_1     | 1:M 29 Apr 2022 12:15:41.072 * Running mode=standalone, port=6379.
redis_1     | 1:M 29 Apr 2022 12:15:41.072 # Server initialized
redis_1     | 1:M 29 Apr 2022 12:15:41.073 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
redis_1     | 1:M 29 Apr 2022 12:15:41.073 * Ready to accept connections
sentinel_1  | redis-sentinel 12:15:41.08 
sentinel_1  | redis-sentinel 12:15:41.08 Welcome to the Bitnami redis-sentinel container
sentinel_1  | redis-sentinel 12:15:41.08 Subscribe to project updates by watching https://github.com/bitnami/bitnami-docker-redis-sentinel
sentinel_1  | redis-sentinel 12:15:41.08 Submit issues and feature requests at https://github.com/bitnami/bitnami-docker-redis-sentinel/issues
sentinel_1  | redis-sentinel 12:15:41.08 
sentinel_1  | redis-sentinel 12:15:41.08 INFO  ==> ** Starting Redis sentinel setup **
sentinel_1  | redis-sentinel 12:15:41.11 INFO  ==> Initializing Redis Sentinel...
sentinel_1  | redis-sentinel 12:15:41.11 INFO  ==> Persisted files detected, restoring...
sentinel_1  | redis-sentinel 12:15:41.12 INFO  ==> ** Redis sentinel setup finished! **
sentinel_1  | 
sentinel_1  | redis-sentinel 12:15:41.13 INFO  ==> ** Starting Redis Sentinel **
sentinel_1  | 1:X 29 Apr 2022 12:15:41.143 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
sentinel_1  | 1:X 29 Apr 2022 12:15:41.144 # Redis version=6.2.7, bits=64, commit=00000000, modified=0, pid=1, just started
sentinel_1  | 1:X 29 Apr 2022 12:15:41.144 # Configuration loaded
sentinel_1  | 1:X 29 Apr 2022 12:15:41.145 * monotonic clock: POSIX clock_gettime
sentinel_1  | 1:X 29 Apr 2022 12:15:41.146 # A key '__redis__compare_helper' was added to Lua globals which is not on the globals allow list nor listed on the deny list.
sentinel_1  | 1:X 29 Apr 2022 12:15:41.147 * Running mode=sentinel, port=26379.
sentinel_1  | 1:X 29 Apr 2022 12:15:41.148 # Sentinel ID is 232f6b838b76c348f123597f2852091a77bdae03
sentinel_1  | 1:X 29 Apr 2022 12:15:41.148 # +monitor master mymaster redis_1 6379 quorum 2

复制品：

$ sudo docker-compose up
Starting docker_redis_2    ... done
Starting docker_sentinel_2 ... done
Attaching to docker_redis_2, docker_sentinel_2
redis_2     | redis 11:53:24.61 
redis_2     | redis 11:53:24.62 Welcome to the Bitnami redis container
redis_2     | redis 11:53:24.63 Subscribe to project updates by watching https://github.com/bitnami/bitnami-docker-redis
redis_2     | redis 11:53:24.63 Submit issues and feature requests at https://github.com/bitnami/bitnami-docker-redis/issues
redis_2     | redis 11:53:24.63 
redis_2     | 
redis_2     | 1:C 29 Apr 2022 11:53:24.649 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
redis_2     | 1:C 29 Apr 2022 11:53:24.651 # Redis version=6.2.7, bits=64, commit=00000000, modified=0, pid=1, just started
redis_2     | 1:C 29 Apr 2022 11:53:24.651 # Configuration loaded
redis_2     | 1:S 29 Apr 2022 11:53:24.653 * monotonic clock: POSIX clock_gettime
redis_2     | 1:S 29 Apr 2022 11:53:24.656 # A key '__redis__compare_helper' was added to Lua globals which is not on the globals allow list nor listed on the deny list.
redis_2     | 1:S 29 Apr 2022 11:53:24.657 * Running mode=standalone, port=6379.
redis_2     | 1:S 29 Apr 2022 11:53:24.657 # Server initialized
redis_2     | 1:S 29 Apr 2022 11:53:24.657 # WARNING overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.
redis_2     | 1:S 29 Apr 2022 11:53:24.659 * Ready to accept connections
redis_2     | 1:S 29 Apr 2022 11:53:24.659 * Connecting to MASTER redis_1:6379
sentinel_2  | redis-sentinel 11:53:24.70 
sentinel_2  | redis-sentinel 11:53:24.71 Welcome to the Bitnami redis-sentinel container
sentinel_2  | redis-sentinel 11:53:24.71 Subscribe to project updates by watching https://github.com/bitnami/bitnami-docker-redis-sentinel
sentinel_2  | redis-sentinel 11:53:24.71 Submit issues and feature requests at https://github.com/bitnami/bitnami-docker-redis-sentinel/issues
sentinel_2  | redis-sentinel 11:53:24.71 
sentinel_2  | redis-sentinel 11:53:24.71 INFO  ==> ** Starting Redis sentinel setup **
redis_2     | 1:S 29 Apr 2022 11:53:34.673 # Unable to connect to MASTER: Resource temporarily unavailable
sentinel_2  | redis-sentinel 11:53:34.75 WARN  ==> Hostname redis_1 could not be resolved, this could lead to connection issues
sentinel_2  | redis-sentinel 11:53:34.76 INFO  ==> Initializing Redis Sentinel...
sentinel_2  | redis-sentinel 11:53:34.76 INFO  ==> Persisted files detected, restoring...
sentinel_2  | redis-sentinel 11:53:34.77 INFO  ==> ** Redis sentinel setup finished! **
sentinel_2  | 
sentinel_2  | redis-sentinel 11:53:34.79 INFO  ==> ** Starting Redis Sentinel **
redis_2     | 1:S 29 Apr 2022 11:53:35.675 * Connecting to MASTER redis_1:6379
sentinel_2  | 1:X 29 Apr 2022 11:53:44.813 # Failed to resolve hostname 'redis_1'
sentinel_2  | 1:X 29 Apr 2022 11:53:44.813 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
sentinel_2  | 1:X 29 Apr 2022 11:53:44.813 # Redis version=6.2.7, bits=64, commit=00000000, modified=0, pid=1, just started
sentinel_2  | 1:X 29 Apr 2022 11:53:44.813 # Configuration loaded
sentinel_2  | 1:X 29 Apr 2022 11:53:44.814 * monotonic clock: POSIX clock_gettime
sentinel_2  | 1:X 29 Apr 2022 11:53:44.815 # A key '__redis__compare_helper' was added to Lua globals which is not on the globals allow list nor listed on the deny list.
sentinel_2  | 1:X 29 Apr 2022 11:53:44.815 * Running mode=sentinel, port=26379.
sentinel_2  | 1:X 29 Apr 2022 11:53:44.816 # Sentinel ID is bfec501e81d8da33def75f23911b606aa395078d
sentinel_2  | 1:X 29 Apr 2022 11:53:44.816 # +monitor master mymaster redis_1 6379 quorum 2
sentinel_2  | 1:X 29 Apr 2022 11:53:44.817 # +tilt #tilt mode entered
redis_2     | 1:S 29 Apr 2022 11:53:45.687 # Unable to connect to MASTER: Resource temporarily unavailable
redis_2     | 1:S 29 Apr 2022 11:53:46.689 * Connecting to MASTER redis_1:6379
sentinel_2  | 1:X 29 Apr 2022 11:53:54.831 # Failed to resolve hostname 'redis_1'
sentinel_2  | 1:X 29 Apr 2022 11:53:54.914 # +tilt #tilt mode entered
redis_2     | 1:S 29 Apr 2022 11:53:56.701 # Unable to connect to MASTER: Resource temporarily unavailable

当不同的redis实例位于不同的机器上时，解析主机名有什么问题吗?或者我刚刚错过了一些基本的内容？

我假设是后者，因为我已经能够通过指定ip地址和副本接收主服务器的主机名来启动并运行它。

任何帮助都将不胜感激！如果需要更多的信息，请告诉我

Answer 1

只有版本高于6.2的哨兵才能解析主机名，但默认情况下不启用。将sentinel resolve-hostnames yes添加到sentinel.conf将有帮助。

如果哨兵的版本较早，则主机名redis_node应替换为和ip。

有关更多细节，请参阅Redis文档中的查看IP地址和DNS名称。。

参考- 松乐答复