连接到cassandra集群时出错

Question

我正在使用docker-compose文件部署一个以cassandra集群为后台的metrictank。

version: '2'

services:
  metrictank0:
    hostname: metrictank0
    image: grafana/metrictank
    expose:
     - 6060
    ports:
     - "2003:2003"
    environment:
      WAIT_HOSTS: cassandra-seed:9042
      WAIT_TIMEOUT: 3000
      MT_CASSANDRA_CREATE_KEYSPACE: "true"
      MT_CASSANDRA_IDX_CREATE_KEYSPACE: "true"
      MT_CLUSTER_BIND_ADDR: "metrictank0:7946"
      MT_CLUSTER_MODE: shard
      MT_CLUSTER_PRIMARY_NODE: "true"
      MT_INSTANCE: metrictank0
      MT_LOG_LEVEL: info
    links:
     - cassandra-seed:9042

  metrictank-q0:
    hostname: metrictank-q0
    image: grafana/metrictank
    expose:
     - 6060
    environment:
      WAIT_HOSTS: metrictank0:6060
      WAIT_TIMEOUT: 3000
      MT_CARBON_IN_ENABLED: "false"
      MT_CASSANDRA_ENABLED: "false"
      MT_CASSANDRA_IDX_ENABLED: "false"
      MT_KAFKA_MDM_IN_ENABLED: "false"
      MT_KAFKA_CLUSTER_ENABLED: "false"
      MT_CLUSTER_BIND_ADDR: "metrictank-q0:7946"
      MT_CLUSTER_MODE: query
      MT_CLUSTER_PEERS: metrictank0,metrictank1
      MT_CLUSTER_PRIMARY_NODE: "false"
      MT_INSTANCE: metrictank-q0
      MT_LOG_LEVEL: info
      MT_CLUSTER_GOSSIP_SETTLE_PERIOD: "10s"
    links:
     - metrictank0

  cassandra-seed:
    hostname: cassandra
    image: cassandra
    ports:
     - "9042:9042"
    environment:
      - "CASSANDRA_CLUSTER_NAME=MyCluster"
#      needed for setting up custom cluster name
      - "CASSANDRA_DC=datacenter1"
      - "CASSANDRA_ENDPOINT_SNITCH=GossipingPropertyFileSnitch"
#    restart: always

  cassandra1:
    hostname: cassandra
    image: cassandra
    environment:
      - "CASSANDRA_SEEDS=cassandra-seed"
      - "CASSANDRA_CLUSTER_NAME=MyCluster"
#      needed for setting up custom cluster name
      - "CASSANDRA_DC=datacenter1"
      - "CASSANDRA_ENDPOINT_SNITCH=GossipingPropertyFileSnitch"
    depends_on:
      - cassandra-seed
#    restart: always

  cassandra2:
    hostname: cassandra
    image: cassandra
    environment:
      - "CASSANDRA_SEEDS=cassandra-seed"
      - "CASSANDRA_CLUSTER_NAME=MyCluster"
#      needed for setting up custom cluster name
      - "CASSANDRA_DC=datacenter2"
      - "CASSANDRA_ENDPOINT_SNITCH=GossipingPropertyFileSnitch"
    depends_on:
      - cassandra-seed
#    restart: always

  graphite:
    hostname: graphite
    image: raintank/graphite-mt
    ports:
     - "8080:80"
    environment:
      GRAPHITE_CLUSTER_SERVERS: metrictank-q0:6060
      GRAPHITE_STATSD_HOST: statsdaemon
      SINGLE_TENANT: "true"
      WSGI_PROCESSES: 4
      WSGI_THREADS: 25

  statsdaemon:
    hostname: statsdaemon
    image: raintank/statsdaemon
    ports:
     - "8125:8125/udp"

但是metrictank docker在运行几秒钟后就停止了，而且它的日志也显示出来了。

2020/06/15 12:48:14 waiting for cassandra-seed:9042 to become up...
2020/06/15 12:48:17 cassandra-seed:9042 is up. maintained connection for 3 seconds!
2020-06-15 12:48:17.217 [INFO] logging level set to 'info'
2020-06-15 12:48:17.218 [INFO] Metrictank starting. version: v0.13.1 - runtime: go1.11.4
2020/06/15 12:48:17 gocql: dns error: lookup cassandra on 127.0.0.11:53: no such host
2020-06-15 12:48:17.221 [ERROR] cassandra_store: failed to create cassandra session. gocql: unable to create session: failed to resolve any of the provided hostnames
2020-06-15 12:48:17.222 [FATAL] failed to initialize cassandra backend store. gocql: unable to create session: failed to resolve any of the provided hostnames

So metrictank is able to connect to the cassandra docker but it is not able to connect to the gocql.Can anyone help me in solving this problem.

Answer 1

我认为你应该有每个Cassandra节点的唯一主机名。cassandra1, cassandra-2 和 cassandra-seed 似乎有相同的主机名。