milvus 异常——无法连接

milvus 突然连接不上了

(UNKNOWN) [127.0.0.1] 19530 (?) : Connection refused
root@svddb:~# nc -zv 127.0.0.1 19530
localhost [127.0.0.1] 19530 (?) : Connection refused
root@svddb:~# nc -zv 127.0.0.1 8000
localhost [127.0.0.1] 8000 (?) open

周末的时候跑的好好的,今天一看,客户端连接不上了,我就登上部署 milvus 的机器,使用 nc 命令试了试，结果：端口拒绝

用 docker ps -a 看容器状态一切正常

用 docker logs -n 100 milvus-standalone 看 milvus 的日志，好多，不想看

打开 attu，发现 attu 也连接不到 milvus

发生的原因是什么呢？milvus 的 bug 吗？

我也不知道，所以我选择重启 milvus 试试，然后看到了下面的输出，大概明白了，是磁盘满了

root@svddb:/opt/milvus# docker-compose restart 
Restarting milvus-standalone ... error
Restarting milvus-etcd       ... done
Restarting zilliz_attu       ... done
Restarting milvus-minio      ... done

ERROR: for milvus-standalone  Cannot restart container 14dfffec1689ed17de43fa0551d3ea2284fc238fa4ff8ad5911fa94e06a30c6d: mkdir /var/lib/docker/overlay2/0653e1c8fed616fff53b215d6a8c09ebdf1a22732a4121750326c94168a653e2/merged: no space left on device

然后使用 df 命令看看，确实，40GB 都满了

root@svddb:/opt/milvus# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.8G     0  3.8G   0% /dev
tmpfs           782M   85M  697M  11% /run
/dev/vda1        40G   40G     0 100% /
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs            50M     0   50M   0% /usr/local/aegis/cgroup
tmpfs           782M     0  782M   0% /run/user/0

下面就是调查是什么把磁盘写满了

使用 ncdu / 发现是一个 milvus 的日志把磁盘写满了

于是，先删除日志文件

root@svddb:/var/lib/docker/containers/14dfffec1689ed17de43fa0551d3ea2284fc238fa4ff8ad5911fa94e06a30c6d# rm -rf 14dfffec1689ed17de43fa0551d3ea2284fc238fa4ff8ad5911fa94e06a30c6d-json.log

然后重启 milvus

root@svddb:/opt/milvus# docker-compose restart
Restarting milvus-standalone ... done
Restarting milvus-etcd       ... done
Restarting zilliz_attu       ... done
Restarting milvus-minio      ... done

于是乎，一切正常了

---

那为什么 milvus 会写这么多日志呢？

小龙：2.1.x默认时debug，2.2.x默认时info

所以，是 2.1 的日志级别太低了

我用的就是 milvus2.1.4

---

解决办法：

参考: Configure Milvus with Docker Compose or Helm

事发前的 docker-compose.yaml

version: "3.5"

services:
  etcd:
    container_name: milvus-etcd
    image: quay.io/coreos/etcd:v3.5.0
    environment:
      - ETCD_AUTO_COMPACTION_MODE=revision
      - ETCD_AUTO_COMPACTION_RETENTION=1000
      - ETCD_QUOTA_BACKEND_BYTES=4294967296
      - ETCD_SNAPSHOT_COUNT=50000
    volumes:
      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/etcd:/etcd
    command: etcd -advertise-client-urls=http://127.0.0.1:2379 -listen-client-urls http://0.0.0.0:2379 --data-dir /etcd

  minio:
    container_name: milvus-minio
    image: minio/minio:RELEASE.2022-03-17T06-34-49Z
    environment:
      MINIO_ACCESS_KEY: minioadmin
      MINIO_SECRET_KEY: minioadmin
    volumes:
      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/minio:/minio_data
    command: minio server /minio_data
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
      interval: 30s
      timeout: 20s
      retries: 3

  standalone:
    container_name: milvus-standalone
    image: milvusdb/milvus:v2.1.4
    command: ["milvus", "run", "standalone"]
    environment:
      ETCD_ENDPOINTS: etcd:2379
      MINIO_ADDRESS: minio:9000
    volumes:
      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/milvus:/var/lib/milvus
    ports:
      - "19530:19530"
      - "9091:9091"
    depends_on:
      - "etcd"
      - "minio"

  zilliz_attu:
    container_name: zilliz_attu
    image: zilliz/attu:latest
    restart: always
    environment:
      HOST_URL: http://192.168.38.191:8000
      MILVUS_URL: 192.168.38.191:19530
    ports:
      - "8000:3000"

networks:
  default:
    name: milvus

事发后的 docker-compose.yaml

version: "3.5"

services:
  etcd:
    container_name: milvus-etcd
    image: quay.io/coreos/etcd:v3.5.0
    environment:
      - ETCD_AUTO_COMPACTION_MODE=revision
      - ETCD_AUTO_COMPACTION_RETENTION=1000
      - ETCD_QUOTA_BACKEND_BYTES=4294967296
      - ETCD_SNAPSHOT_COUNT=50000
    volumes:
      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/etcd:/etcd
    command: etcd -advertise-client-urls=http://127.0.0.1:2379 -listen-client-urls http://0.0.0.0:2379 --data-dir /etcd

  minio:
    container_name: milvus-minio
    image: minio/minio:RELEASE.2022-03-17T06-34-49Z
    environment:
      MINIO_ACCESS_KEY: minioadmin
      MINIO_SECRET_KEY: minioadmin
    volumes:
      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/minio:/minio_data
    command: minio server /minio_data
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
      interval: 30s
      timeout: 20s
      retries: 3

  standalone:
    container_name: milvus-standalone
    image: milvusdb/milvus:v2.1.4
    command: ["milvus", "run", "standalone"]
    environment:
      ETCD_ENDPOINTS: etcd:2379
      MINIO_ADDRESS: minio:9000
    volumes:
      - ${DOCKER_VOLUME_DIRECTORY:-.}/volumes/milvus:/var/lib/milvus
      - ./milvus.yaml:/milvus/configs/milvus.yaml
    ports:
      - "19530:19530"
      - "9091:9091"
    depends_on:
      - "etcd"
      - "minio"

  zilliz_attu:
    container_name: zilliz_attu
    image: zilliz/attu:latest
    restart: always
    environment:
      HOST_URL: http://192.168.38.191:8000
      MILVUS_URL: 192.168.38.191:19530
    ports:
      - "8000:3000"

networks:
  default:
    name: milvus

增加了一个 milvus.yaml 文件，用来调整 milvus 的日志级别，从 debug 改成 warn

milvus.yaml

# Licensed to the LF AI & Data foundation under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Related configuration of etcd, used to store Milvus metadata.
etcd:
  endpoints:
    - localhost:2379
  rootPath: by-dev # The root path where data is stored in etcd
  metaSubPath: meta # metaRootPath = rootPath + '/' + metaSubPath
  kvSubPath: kv # kvRootPath = rootPath + '/' + kvSubPath
  log:
    # path is one of:
    #  - "default" as os.Stderr,
    #  - "stderr" as os.Stderr,
    #  - "stdout" as os.Stdout,
    #  - file path to append server logs to.
    # please adjust in embedded Milvus: /tmp/milvus/logs/etcd.log
    path: stdout
    level: warn # Only supports debug, info, warn, error, panic, or fatal. Default 'info'.
  use:
    # please adjust in embedded Milvus: true
    embed: false # Whether to enable embedded Etcd (an in-process EtcdServer).
  data:
    # Embedded Etcd only.
    # please adjust in embedded Milvus: /tmp/milvus/etcdData/
    dir: default.etcd
  ssl:
    enabled: false # Whether to support ETCD secure connection mode
    tlsCert: /path/to/etcd-client.pem # path to your cert file
    tlsKey: /path/to/etcd-client-key.pem # path to your key file
    tlsCACert: /path/to/ca.pem # path to your CACert file
    # TLS min version
    # Optional values: 1.0, 1.1, 1.2, 1.3。
    # We recommend using version 1.2 and above
    tlsMinVersion: 1.3

# please adjust in embedded Milvus: /tmp/milvus/data/
localStorage:
  path: /var/lib/milvus/data/

# Related configuration of minio, which is responsible for data persistence for Milvus.
minio:
  address: localhost # Address of MinIO/S3
  port: 9000 # Port of MinIO/S3
  accessKeyID: minioadmin # accessKeyID of MinIO/S3
  secretAccessKey: minioadmin # MinIO/S3 encryption string
  useSSL: false # Access to MinIO/S3 with SSL
  bucketName: "a-bucket" # Bucket name in MinIO/S3
  rootPath: files # The root path where the message is stored in MinIO/S3
  # Whether to use AWS IAM role to access S3 instead of access/secret keys
  # For more infomation, refer to https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_use.html
  useIAM: false
  # Custom endpoint for fetch IAM role credentials.
  # Leave it empty if you want to use AWS default endpoint
  iamEndpoint: ""

# Milvus supports three MQ: rocksmq(based on RockDB), Pulsar and Kafka, which should be reserved in config what you use.
# There is a note about enabling priority if we config multiple mq in this file
# 1. standalone(local) mode: rockskmq(default) > Pulsar > Kafka
# 2. cluster mode:  Pulsar(default) > Kafka (rocksmq is unsupported)

# Related configuration of pulsar, used to manage Milvus logs of recent mutation operations, output streaming log, and provide log publish-subscribe services.
pulsar:
  address: localhost # Address of pulsar
  port: 6650 # Port of pulsar
  webport: 80 # Web port of pulsar, if you connect direcly without proxy, should use 8080
  maxMessageSize: 5242880 # 5 * 1024 * 1024 Bytes, Maximum size of each message in pulsar.

# If you want to enable kafka, needs to comment the pulsar configs
#kafka:
#  brokerList: localhost1:9092,localhost2:9092,localhost3:9092
#  saslUsername: username
#  saslPassword: password
#  saslMechanisms: PLAIN
#  securityProtocol: SASL_SSL

rocksmq:
  # please adjust in embedded Milvus: /tmp/milvus/rdb_data
  path: /var/lib/milvus/rdb_data # The path where the message is stored in rocksmq
  rocksmqPageSize: 2147483648 # 2 GB, 2 * 1024 * 1024 * 1024 bytes, The size of each page of messages in rocksmq
  retentionTimeInMinutes: 7200 # 5 days, 5 * 24 * 60 minutes, The retention time of the message in rocksmq.
  retentionSizeInMB: 8192 # 8 GB, 8 * 1024 MB, The retention size of the message in rocksmq.
  compactionInterval: 86400 # 1 day, trigger rocksdb compaction every day to remove deleted data
  lrucacheratio: 0.06 # rocksdb cache memory ratio

# Related configuration of rootCoord, used to handle data definition language (DDL) and data control language (DCL) requests
rootCoord:
  address: localhost
  port: 53100

  dmlChannelNum: 256 # The number of dml channels created at system startup
  maxPartitionNum: 4096 # Maximum number of partitions in a collection
  minSegmentSizeToEnableIndex: 1024 # It's a threshold. When the segment size is less than this value, the segment will not be indexed

  # (in seconds) Duration after which an import task will expire (be killed). Default 900 seconds (15 minutes).
  # Note: If default value is to be changed, change also the default in: internal/util/paramtable/component_param.go
  importTaskExpiration: 900
  # (in seconds) Milvus will keep the record of import tasks for at least `importTaskRetention` seconds. Default 86400
  # seconds (24 hours).
  # Note: If default value is to be changed, change also the default in: internal/util/paramtable/component_param.go
  importTaskRetention: 86400
  # (in seconds) Check an import task's segment loading state in queryNodes every `importSegmentStateCheckInterval`
  # seconds. Default 10 seconds.
  # Note: If default value is to be changed, change also the default in: internal/util/paramtable/component_param.go
  importSegmentStateCheckInterval: 10
  # (in seconds) Maximum time to wait for segments in a single import task to be loaded in queryNodes.
  # Default 60 seconds (1 minute).
  # Note: If default value is to be changed, change also the default in: internal/util/paramtable/component_param.go
  importSegmentStateWaitLimit: 60
  # (in seconds) Check the building status of a task's segments' indices every `importIndexCheckInterval` seconds.
  # Default 10 seconds.
  # Note: If default value is to be changed, change also the default in: internal/util/paramtable/component_param.go
  importIndexCheckInterval: 10
  # (in seconds) Maximum time to wait for indices to be built on a single import task's segments.
  # Default 600 seconds (10 minutes).
  # Note: If default value is to be changed, change also the default in: internal/util/paramtable/component_param.go
  importIndexWaitLimit: 600

# Related configuration of proxy, used to validate client requests and reduce the returned results.
proxy:
  port: 19530
  internalPort: 19529
  http:
    enabled: true # Whether to enable the http server
    debug_mode: false # Whether to enable http server debug mode

  timeTickInterval: 200 # ms, the interval that proxy synchronize the time tick
  msgStream:
    timeTick:
      bufSize: 512
  maxNameLength: 255 # Maximum length of name for a collection or alias
  maxFieldNum: 256 # Maximum number of fields in a collection
  maxDimension: 32768 # Maximum dimension of a vector
  maxShardNum: 256 # Maximum number of shards in a collection
  maxTaskNum: 1024 # max task number of proxy task queue
  # please adjust in embedded Milvus: false
  ginLogging: true # Whether to produce gin logs.

# Related configuration of queryCoord, used to manage topology and load balancing for the query nodes, and handoff from growing segments to sealed segments.
queryCoord:
  address: localhost
  port: 19531
  autoHandoff: true # Enable auto handoff
  autoBalance: true # Enable auto balance
  overloadedMemoryThresholdPercentage: 90 # The threshold percentage that memory overload
  balanceIntervalSeconds: 60
  memoryUsageMaxDifferencePercentage: 30
  maxTask: 2048

# Related configuration of queryNode, used to run hybrid search between vector and scalar data.
queryNode:
  cacheSize: 32 # GB, default 32 GB, `cacheSize` is the memory used for caching data for faster query. The `cacheSize` must be less than system memory size.
  port: 21123
  loadMemoryUsageFactor: 3 # The multiply factor of calculating the memory usage while loading segments

  stats:
    publishInterval: 1000 # Interval for querynode to report node information (milliseconds)
  dataSync:
    flowGraph:
      maxQueueLength: 1024 # Maximum length of task queue in flowgraph
      maxParallelism: 1024 # Maximum number of tasks executed in parallel in the flowgraph
  # Segcore will divide a segment into multiple chunks to enbale small index
  segcore:
    chunkRows: 1024 # The number of vectors in a chunk.
    # Note: we have disabled segment small index since @2022.05.12. So below related configurations won't work.
    # We won't create small index for growing segments and search on these segments will directly use bruteforce scan.
    smallIndex:
      nlist: 128 # small index nlist, recommend to set sqrt(chunkRows), must smaller than chunkRows/8
      nprobe: 16 # nprobe to search small index, based on your accuracy requirement, must smaller than nlist
  cache:
    enabled: true
    memoryLimit: 2147483648 # 2 GB, 2 * 1024 *1024 *1024

  scheduler:
    receiveChanSize: 10240
    unsolvedQueueSize: 10240
    # maxReadConcurrentRatio is the concurrency ratio of read task (search task and query task).
    # Max read concurrency would be the value of `runtime.NumCPU * maxReadConcurrentRatio`.
    # It defaults to 2.0, which means max read concurrency would be the value of runtime.NumCPU * 2.
    # Max read concurrency must greater than or equal to 1, and less than or equal to runtime.NumCPU * 100.
    maxReadConcurrentRatio: 2.0 # (0, 100]
    cpuRatio: 10.0 # ratio used to estimate read task cpu usage.

  grouping:
    enabled: true
    maxNQ: 1000
    topKMergeRatio: 10.0

indexCoord:
  address: localhost
  port: 31000

  gc:
    interval: 600 # gc interval in seconds

indexNode:
  port: 21121

  scheduler:
    buildParallel: 1

dataCoord:
  address: localhost
  port: 13333
  enableCompaction: true # Enable data segment compression
  enableGarbageCollection: true

  segment:
    maxSize: 512 # Maximum size of a segment in MB
    sealProportion: 0.25 # It's the minimum proportion for a segment which can be sealed
    assignmentExpiration: 2000 # The time of the assignment expiration in ms
    maxLife: 86400 # The max lifetime of segment in seconds, 24*60*60

  compaction:
    enableAutoCompaction: true

  gc:
    interval: 3600 # gc interval in seconds
    missingTolerance: 86400 # file meta missing tolerance duration in seconds, 60*24
    dropTolerance: 86400 # file belongs to dropped entity tolerance duration in seconds, 60*24

dataNode:
  port: 21124

  dataSync:
    flowGraph:
      maxQueueLength: 1024 # Maximum length of task queue in flowgraph
      maxParallelism: 1024 # Maximum number of tasks executed in parallel in the flowgraph
  flush:
    # Max buffer size to flush for a single segment.
    insertBufSize: 16777216 # Bytes, 16 MB

# Configures the system log output.
log:
  level: warn # Only supports debug, info, warn, error, panic, or fatal. Default 'info'.
  file:
    # please adjust in embedded Milvus: /tmp/milvus/logs
    rootPath: "" # default to stdout, stderr
    maxSize: 300 # MB
    maxAge: 10 # Maximum time for log retention in day.
    maxBackups: 20
  format: text # text/json

grpc:
  log:
    level: WARNING

  serverMaxRecvSize: 2147483647 # math.MaxInt32
  serverMaxSendSize: 2147483647 # math.MaxInt32
  clientMaxRecvSize: 104857600 # 100 MB, 100 * 1024 * 1024
  clientMaxSendSize: 104857600 # 100 MB, 100 * 1024 * 1024

  client:
    dialTimeout: 5000
    keepAliveTime: 10000
    keepAliveTimeout: 20000
    maxMaxAttempts: 5
    initialBackOff: 1.0
    maxBackoff: 60.0
    backoffMultiplier: 2.0

# Configure the proxy tls enable.
tls:
  serverPemPath: configs/cert/server.pem
  serverKeyPath: configs/cert/server.key
  caPemPath: configs/cert/ca.pem

common:
  # Channel name generation rule: ${namePrefix}-${ChannelIdx}
  chanNamePrefix:
    cluster: "by-dev"
    rootCoordTimeTick: "rootcoord-timetick"
    rootCoordStatistics: "rootcoord-statistics"
    rootCoordDml: "rootcoord-dml"
    rootCoordDelta: "rootcoord-delta"
    search: "search"
    searchResult: "searchResult"
    queryTimeTick: "queryTimeTick"
    queryNodeStats: "query-node-stats"
    # Cmd for loadIndex, flush, etc...
    cmd: "cmd"
    dataCoordStatistic: "datacoord-statistics-channel"
    dataCoordTimeTick: "datacoord-timetick-channel"
    dataCoordSegmentInfo: "segment-info-channel"

  # Sub name generation rule: ${subNamePrefix}-${NodeID}
  subNamePrefix:
    rootCoordSubNamePrefix: "rootCoord"
    proxySubNamePrefix: "proxy"
    queryNodeSubNamePrefix: "queryNode"
    dataNodeSubNamePrefix: "dataNode"
    dataCoordSubNamePrefix: "dataCoord"

  defaultPartitionName: "_default" # default partition name for a collection
  defaultIndexName: "_default_idx" # default index name
  retentionDuration: 432000 # 5 days in seconds
  entityExpiration: -1 # Entity expiration in seconds, CAUTION make sure entityExpiration >= retentionDuration and -1 means never expire

  gracefulTime: 5000 # milliseconds. it represents the interval (in ms) by which the request arrival time needs to be subtracted in the case of Bounded Consistency.

  # Default value: auto
  # Valid values: [auto, avx512, avx2, avx, sse4_2]
  # This configuration is only used by querynode and indexnode, it selects CPU instruction set for Searching and Index-building.
  simdType: auto
  indexSliceSize: 16 # MB

  # please adjust in embedded Milvus: local
  storageType: minio

  security:
    authorizationEnabled: false
    # tls mode values [0, 1, 2]
    # 0 is close, 1 is one-way authentication, 2 is two-way authentication.
    tlsMode: 0

  mem_purge_ratio: 0.2 # in Linux os, if memory-fragmentation-size >= used-memory * ${mem_purge_ratio}, then do `malloc_trim`