docker - CouchDB Docker 容器需要 2 分钟才能启动

Question

我有一个在 Traefik 反向代理下使用 CouchDB 容器的项目。这是我的 docker-compose.yml 文件:

version: '3'

services:
  db:
    image: couchdb:2
    environment:
      - COUCHDB_USER
      - COUCHDB_PASSWORD
labels:
  - traefik.enable=true
  - traefik.backend=couchdb
  - traefik.frontend.rule=Host:db.${APP_HOST}
  - traefik.docker.network=app-internal
  - traefik.port=5984
networks:
  - server
volumes: 
  - couchdb_data:/opt/couchdb/data
  - couchdb_config:/opt/couchdb/etc

networks:
  server:
    external:
      name: app-internal

volumes: 
  couchdb_data: {}
  couchdb_config: {}

我可以使用 docker-compose up -d 成功启动容器，但每次发出请求时都会收到 502 Bad Gateway 错误。

如果我运行docker-compose logs -f，我只会得到:

Attaching to app_db_1

但是大约 2 分钟后，我得到如下日志:

Attaching to app_db_1
db_1      | [info] 2018-07-29T04:38:45.002045Z nonode@nohost <0.7.0> -------- Application couch_log started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.006960Z nonode@nohost <0.7.0> -------- Application folsom started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.076415Z nonode@nohost <0.7.0> -------- Application couch_stats started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.076561Z nonode@nohost <0.7.0> -------- Application khash started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.086425Z nonode@nohost <0.7.0> -------- Application couch_event started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.095918Z nonode@nohost <0.7.0> -------- Application ibrowse started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.104024Z nonode@nohost <0.7.0> -------- Application ioq started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.106795Z nonode@nohost <0.7.0> -------- Application mochiweb started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:45.116667Z nonode@nohost <0.195.0> -------- Apache CouchDB 2.1.2 is starting.
db_1      | 
db_1      | [info] 2018-07-29T04:38:45.119537Z nonode@nohost <0.196.0> -------- Starting couch_sup
db_1      | [info] 2018-07-29T04:38:45.366272Z nonode@nohost <0.47.0> -------- alarm_handler: {set,{system_memory_high_watermark,[]}}
db_1      | [info] 2018-07-29T04:38:46.174267Z nonode@nohost <0.195.0> -------- Apache CouchDB has started. Time to relax.
db_1      | 
db_1      | [info] 2018-07-29T04:38:46.174398Z nonode@nohost <0.195.0> -------- Apache CouchDB has started on http://any:5986/
db_1      | [info] 2018-07-29T04:38:46.174571Z nonode@nohost <0.7.0> -------- Application couch started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:46.174743Z nonode@nohost <0.7.0> -------- Application ets_lru started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:46.287113Z nonode@nohost <0.7.0> -------- Application rexi started on node nonode@nohost
db_1      | [error] 2018-07-29T04:38:46.341609Z nonode@nohost emulator -------- Error in process <0.265.0> with exit value: {badarg,[{ets,member,[mem3_openers,<<11 bytes>>],[]},{mem3_shards,maybe_spawn_shard_writer,3,[{file,"src/mem3_shards.erl"},{line,486}]},{mem3_shards,load_shards_from_db,2,[{file,"src/mem3_shards.erl"},{line,389}]},{mem3_shards,load_shards_from_disk... 
db_1      | [error] 2018-07-29T04:38:46.342196Z nonode@nohost <0.248.0> -------- Error opening view group `_replicator` from database `shards/80000000-9fffffff/_replicator.1532833386`: {'EXIT',{{badmatch,{badarg,[{ets,member,[mem3_openers,<<"_replicator">>],[]},{mem3_shards,maybe_spawn_shard_writer,3,[{file,"src/mem3_shards.erl"},{line,486}]},{mem3_shards,load_shards_from_db,2,[{file,"src/mem3_shards.erl"},{line,389}]},{mem3_shards,load_shards_from_disk,1,[{file,"src/mem3_shards.erl"},{line,378}]},{mem3_shards,load_shards_from_disk,2,[{file,"src/mem3_shards.erl"},{line,407}]},{mem3_shards,for_docid,3,[{file,"src/mem3_shards.erl"},{line,96}]},{fabric_doc_open,go,3,[{file,"src/fabric_doc_open.erl"},{line,38}]},{couch_index_server,'-get_index/3-fun-0-',2,[{file,"src/couch_index_server.erl"},{line,68}]}]}},[{couch_mrview,get_info,2,[{file,"src/couch_mrview.erl"},{line,332}]},{couch_compaction_daemon,maybe_compact_view,3,[{file,"src/couch_compaction_daemon.erl"},{line,253}]},{couch_compaction_daemon,maybe_compact_views,3,[{file,"src/couch_compaction_daemon.erl"},{line,227}]},{couch_compaction_daemon,'-compact_loop/1-fun-0-',3,[{file,"src/couch_compaction_daemon.erl"},{line,141}]},{couch_server,'-all_databases/2-fun-0-',4,[{file,"src/couch_server.erl"},{line,278}]},{filelib,do_fold_files2,8,[{file,"filelib.erl"},{line,184}]},{filelib,do_fold_files2,8,[{file,"filelib.erl"},{line,194}]},{couch_server,all_databases,2,[{file,"src/couch_server.erl"},{line,267}]}]}}
db_1      | [error] 2018-07-29T04:38:46.730749Z nonode@nohost emulator -------- Error in process <0.310.0> with exit value: {badarg,[{ets,member,[mem3_openers,<<6 bytes>>],[]},{mem3_shards,maybe_spawn_shard_writer,3,[{file,"src/mem3_shards.erl"},{line,486}]},{mem3_shards,load_shards_from_db,2,[{file,"src/mem3_shards.erl"},{line,389}]},{mem3_shards,load_shards_from_disk... 
db_1      | [error] 2018-07-29T04:38:46.732051Z nonode@nohost <0.248.0> -------- Error opening view group `_auth` from database `shards/40000000-5fffffff/_users.1532833374`: {'EXIT',{{badmatch,{badarg,[{ets,member,[mem3_openers,<<"_users">>],[]},{mem3_shards,maybe_spawn_shard_writer,3,[{file,"src/mem3_shards.erl"},{line,486}]},{mem3_shards,load_shards_from_db,2,[{file,"src/mem3_shards.erl"},{line,389}]},{mem3_shards,load_shards_from_disk,1,[{file,"src/mem3_shards.erl"},{line,378}]},{mem3_shards,load_shards_from_disk,2,[{file,"src/mem3_shards.erl"},{line,407}]},{mem3_shards,for_docid,3,[{file,"src/mem3_shards.erl"},{line,96}]},{fabric_doc_open,go,3,[{file,"src/fabric_doc_open.erl"},{line,38}]},{couch_index_server,'-get_index/3-fun-0-',2,[{file,"src/couch_index_server.erl"},{line,68}]}]}},[{couch_mrview,get_info,2,[{file,"src/couch_mrview.erl"},{line,332}]},{couch_compaction_daemon,maybe_compact_view,3,[{file,"src/couch_compaction_daemon.erl"},{line,253}]},{couch_compaction_daemon,maybe_compact_views,3,[{file,"src/couch_compaction_daemon.erl"},{line,227}]},{couch_compaction_daemon,'-compact_loop/1-fun-0-',3,[{file,"src/couch_compaction_daemon.erl"},{line,141}]},{couch_server,'-all_databases/2-fun-0-',4,[{file,"src/couch_server.erl"},{line,278}]},{filelib,do_fold_files2,8,[{file,"filelib.erl"},{line,184}]},{filelib,do_fold_files2,8,[{file,"filelib.erl"},{line,194}]},{couch_server,all_databases,2,[{file,"src/couch_server.erl"},{line,267}]}]}}
db_1      | [info] 2018-07-29T04:38:46.792070Z nonode@nohost <0.7.0> -------- Application mem3 started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:46.792258Z nonode@nohost <0.7.0> -------- Application fabric started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.038648Z nonode@nohost <0.7.0> -------- Application chttpd started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.058860Z nonode@nohost <0.7.0> -------- Application couch_index started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.058951Z nonode@nohost <0.7.0> -------- Application couch_mrview started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.058997Z nonode@nohost <0.7.0> -------- Application couch_plugins started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.078801Z nonode@nohost <0.373.0> -------- Opening index for db: _users idx: _design/_auth sig: "3e823c2a4383ac0c18d4e574135a5b08"
db_1      | [info] 2018-07-29T04:38:47.183364Z nonode@nohost <0.404.0> -------- Opening index for db: _replicator idx: _design/_replicator sig: "3e823c2a4383ac0c18d4e574135a5b08"
db_1      | [notice] 2018-07-29T04:38:47.267666Z nonode@nohost <0.82.0> -------- config: [features] scheduler set to true for reason nil
db_1      | [info] 2018-07-29T04:38:47.301691Z nonode@nohost <0.7.0> -------- Application couch_replicator started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.316926Z nonode@nohost <0.7.0> -------- Application couch_peruser started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.340586Z nonode@nohost <0.7.0> -------- Application ddoc_cache started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.359635Z nonode@nohost <0.7.0> -------- Application global_changes started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.359675Z nonode@nohost <0.7.0> -------- Application jiffy started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.369212Z nonode@nohost <0.7.0> -------- Application mango started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.373713Z nonode@nohost <0.7.0> -------- Application setup started on node nonode@nohost
db_1      | [info] 2018-07-29T04:38:47.373771Z nonode@nohost <0.7.0> -------- Application snappy started on node nonode@nohost

之后，我可以成功向数据库发出请求

我测试了很多次，总是需要差不多2分钟。

有人知道为什么会发生这种情况吗？

提前致谢。

更新:我在没有 Traefik 的情况下运行它，但仍然遇到同样的问题

Answer 1

我知道我来晚了，但今天我在创建脚本来帮助测试我的 CouchDB 备份时遇到了同样的问题。经过一番调查，我发现延迟的根源是 docker-entrypoint.sh 脚本中的一行，该脚本更新了/opt/couchdb 树中文件的所有权容器。这是行:

find /opt/couchdb \! \( -user couchdb -group couchdb \) -exec chown -f couchdb:couchdb '{}' +

该命令必须在容器首次启动期间更新 1600 多个文件。这可能需要一些时间，具体取决于您的容器主机和主机文件系统。

在 CouchDB 项目修复此问题之前，您可以使用此 Dockerfile 派生您自己的优化容器:

FROM couchdb:latest

RUN find /opt/couchdb \! \( -user couchdb -group couchdb \) -exec chown -c couchdb:couchdb '{}' +

使用此容器镜像作为测试容器的基础，我能够将初始启动时间从 > 50 秒减少到 3 秒。