MongoDB 7.0.2启动失败，无法在27017端口建立连接

执行mongod命令启动MongoDB 7.0.2时出现错误，无法在27017端口建立可用连接，核心报错显示当前MongoDB版本过新，无法适配现有数据文件，需使用MongoDB 4.2或更早版本。

执行命令 #

$ mongod

报错输出 #

{"t":{"$date":"2023-09-30T23:35:49.825-07:00"},"s":"I",  "c":"NETWORK",  "id":4915701, "ctx":"thread1","msg":"Initialized wire specification","attr":{"spec":{"incomingExternalClient":{"minWireVersion":0,"maxWireVersion":21},"incomingInternalClient":{"minWireVersion":0,"maxWireVersion":21},"outgoing":{"minWireVersion":6,"maxWireVersion":21},"isInternalClient":true}}}
{"t":{"$date":"2023-09-30T23:35:49.827-07:00"},"s":"I",  "c":"CONTROL",  "id":23285,   "ctx":"thread1","msg":"Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'"}
{"t":{"$date":"2023-09-30T23:35:50.921-07:00"},"s":"I",  "c":"NETWORK",  "id":4648602, "ctx":"thread1","msg":"Implicit TCP FastOpen in use."}
{"t":{"$date":"2023-09-30T23:35:50.923-07:00"},"s":"I",  "c":"REPL",     "id":5123008, "ctx":"thread1","msg":"Successfully registered PrimaryOnlyService","attr":{"service":"TenantMigrationDonorService","namespace":"config.tenantMigrationDonors"}}
{"t":{"$date":"2023-09-30T23:35:50.923-07:00"},"s":"I",  "c":"REPL",     "id":5123008, "ctx":"thread1","msg":"Successfully registered PrimaryOnlyService","attr":{"service":"TenantMigrationRecipientService","namespace":"config.tenantMigrationRecipients"}}
{"t":{"$date":"2023-09-30T23:35:50.923-07:00"},"s":"I",  "c":"CONTROL",  "id":5945603, "ctx":"thread1","msg":"Multi threading initialized"}
{"t":{"$date":"2023-09-30T23:35:50.923-07:00"},"s":"I",  "c":"TENANT_M", "id":7091600, "ctx":"thread1","msg":"Starting TenantMigrationAccessBlockerRegistry"}
{"t":{"$date":"2023-09-30T23:35:50.924-07:00"},"s":"I",  "c":"CONTROL",  "id":4615611, "ctx":"initandlisten","msg":"MongoDB starting","attr":{"pid":21760,"port":27017,"dbPath":"C:/data/db/","architecture":"64-bit","host":"CGPaari-LT"}}
{"t":{"$date":"2023-09-30T23:35:50.924-07:00"},"s":"I",  "c":"CONTROL",  "id":23398,   "ctx":"initandlisten","msg":"Target operating system minimum version","attr":{"targetMinOS":"Windows 7/Windows Server 2008 R2"}}
{"t":{"$date":"2023-09-30T23:35:50.924-07:00"},"s":"I",  "c":"CONTROL",  "id":23403,   "ctx":"initandlisten","msg":"Build Info","attr":{"buildInfo":{"version":"7.0.2","gitVersion":"02b3c655e1302209ef046da6ba3ef6749dd0b62a","modules":[],"allocator":"tcmalloc","environment":{"distmod":"windows","distarch":"x86_64","target_arch":"x86_64"}}}}
{"t":{"$date":"2023-09-30T23:35:50.925-07:00"},"s":"I",  "c":"CONTROL",  "id":51765,   "ctx":"initandlisten","msg":"Operating System","attr":{"os":{"name":"Microsoft Windows 10","version":"10.0 (build 22621)"}}}
{"t":{"$date":"2023-09-30T23:35:50.925-07:00"},"s":"I",  "c":"CONTROL",  "id":21951,   "ctx":"initandlisten","msg":"Options set by command line","attr":{"options":{}}}
{"t":{"$date":"2023-09-30T23:35:50.926-07:00"},"s":"I",  "c":"STORAGE",  "id":22270,   "ctx":"initandlisten","msg":"Storage engine to use detected by data files","attr":{"dbpath":"C:/data/db/","storageEngine":"wiredTiger"}}
{"t":{"$date":"2023-09-30T23:35:50.926-07:00"},"s":"I",  "c":"STORAGE",  "id":22315,   "ctx":"initandlisten","msg":"Opening WiredTiger","attr":{"config":"create,cache_size=7526M,session_max=33000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,remove=true,path=journal,compressor=snappy),builtin_extension_config=(zstd=(compression_level=6)),file_manager=(close_idle_time=600,close_scan_interval=10,close_handle_minimum=2000),statistics_log=(wait=0),json_output=(error,message),verbose=[recovery_progress:1,checkpoint_progress:1,compact_progress:1,backup:0,checkpoint:0,compact:0,evict:0,history_store:0,recovery:0,rts:0,salvage:0,tiered:0,timestamp:0,transaction:0,verify:0,log:0],"}}
{"t":{"$date":"2023-09-30T23:35:50.939-07:00"},"s":"F",  "c":"STORAGE",  "id":4671205, "ctx":"initandlisten","msg":"此MongoDB版本过新，无法启动现有数据文件。请尝试MongoDB 4.2或更早版本。"}
{"t":{"$date":"2023-09-30T23:35:50.939-07:00"},"s":"F",  "c":"ASSERT",   "id":23091,   "ctx":"initandlisten","msg":"致命断言","attr":{"msgid":4671205,"file":"src\\mongo\\db\\storage\\wiredtiger\\wiredtiger_kv_engine.cpp","line":640}}
{"t":{"$date":"2023-09-30T23:35:50.940-07:00"},"s":"F",  "c":"ASSERT",   "id":23092,   "ctx":"initandlisten","msg":"***fassert()失败后终止"}

解决方案 #

1. 降级MongoDB版本

卸载当前MongoDB 7.0.2版本，安装MongoDB 4.2或更早版本，启动后即可直接适配现有数据文件。

2. 迁移数据至新版本（保留旧数据）

• 安装对应旧版本（4.2或更早）并启动服务；
• 导出所有数据：

  mongodump --out C:/data/mongo_backup/
  

• 停止旧版本服务，安装MongoDB 7.0.2；
• 清空原数据目录（默认C:/data/db/）；
• 导入备份数据：

  mongorestore C:/data/mongo_backup/
  

• 启动MongoDB 7.0.2服务。

3. 使用新数据目录启动（舍弃旧数据）

若无需保留旧数据，可指定空的新数据目录启动：

mongod --dbpath C:/data/new_db/

内容的提问来源于stack exchange，提问作者Nari Gaming