这篇文章主要介绍“MongoDB的JSON格式日志是什么”，在日常操作中，相信很多人在MongoDB的JSON格式日志是什么问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”MongoDB的JSON格式日志是什么”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

从4.4版本开始，MongoDB的mongo和mongos日志文件格式采用了JSON格式，更容易分析、解析。在此之前和其他日志文件格式一样，纯文本输出。

4.4日志格式

JSON格式更清晰，也更细分析、解析，非常方便。

{"t":{"$date":"2020-08-31T16:23:50.984+08:00"},"s":"I","c":"CONTROL","id":23285,"ctx":"main","msg":"AutomaticallydisablingTLS1.0,toforce-enableTLS1.0specify--sslDisabledProtocols'none'"}{"t":{"$date":"2020-08-31T16:23:50.987+08:00"},"s":"W","c":"ASIO","id":22601,"ctx":"main","msg":"NoTransportLayerconfiguredduringNetworkInterfacestartup"}{"t":{"$date":"2020-08-31T16:23:50.987+08:00"},"s":"I","c":"NETWORK","id":4648601,"ctx":"main","msg":"ImplicitTCPFastOpenunavailable.IfTCPFastOpenisrequired,settcpFastOpenServer,tcpFastOpenClient,andtcpFastOpenQueueSize."}{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I","c":"STORAGE","id":4615611,"ctx":"initandlisten","msg":"MongoDBstarting","attr":{"pid":5836,"port":27017,"dbPath":"/usr/local/mongo4.4.0/data/db","architecture":"64-bit","host":"lei"}}{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I","c":"CONTROL","id":23403,"ctx":"initandlisten","msg":"BuildInfo","attr":{"buildInfo":{"version":"4.4.0","gitVersion":"563487e100c4215e2dce98d0af2a6a5a2d67c5cf","openSSLVersion":"OpenSSL1.0.1e-fips11Feb2013","modules":[],"allocator":"tcmalloc","environment":{"distmod":"rhel70","distarch":"x86_64","target_arch":"x86_64"}}}}{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I","c":"CONTROL","id":51765,"ctx":"initandlisten","msg":"OperatingSystem","attr":{"os":{"name":"CentOSLinuxrelease7.5.1804(Core)","version":"Kernel3.10.0-862.el7.x86_64"}}}{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I","c":"CONTROL","id":21951,"ctx":"initandlisten","msg":"Optionssetbycommandline","attr":{"options":{"config":"/etc/mongo.conf","net":{"bindIp":"0.0.0.0","maxIncomingConnections":100,"port":27017},"processManagement":{"fork":true},"security":{"authorization":"enabled"},"storage":{"dbPath":"/usr/local/mongo4.4.0/data/db","engine":"wiredTiger","journal":{"enabled":true}},"systemLog":{"destination":"file","logAppend":true,"path":"/usr/local/mongo4.4.0/logs/mongodb.log"}}}}{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"E","c":"STORAGE","id":20557,"ctx":"initandlisten","msg":"DBExceptionininitAndListen,terminating","attr":{"error":"NonExistentPath:Datadirectory/usr/local/mongo4.4.0/data/dbnotfound.Createthemissingdirectoryorspecifyanotherpathusing(1)the--dbpathcommandlineoption,or(2)byaddingthe'storage.dbPath'optionintheconfigurationfile."}}{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I","c":"NETWORK","id":20562,"ctx":"initandlisten","msg":"Shutdown:goingtocloselisteningsockets"}{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I","c":"-","id":20520,"ctx":"initandlisten","msg":"StoppingfurtherFlowControlticketacquisitions."}{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I","c":"CONTROL","id":20565,"ctx":"initandlisten","msg":"Nowexiting"}{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I","c":"CONTROL","id":23138,"ctx":"initandlisten","msg":"Shuttingdown","attr":{"exitCode":100}}

KEY缩写：

{"t":<Datetime>,//timestamp"s":<String>,//severity"c":<String>,//component"ctx":<String>,//context"id":<String>,//uniqueidentifier"msg":<String>,//messagebody"attr":<Object>//additionalattributes(optional)"tags":<Arrayofstrings>//tags(optional)"truncated":<Object>//truncationinfo(iftruncated)"size":<Integer>//originalsizeofentry(iftruncated)}

KEY说明：

Timestamp：时间戳，日志事件发生的时间

Serverity：日志信息等级

F：Fatal

E：Error

W：Warning

I：Information

D1-D5：Debug级别，从4.2开始支持指定Debug级别。

Compontents：日志事件的分类

ACCESS：登入访问相关的信息，例如登录验证情况。

COMMAND：数据库执行命令相关信息，例如，查询。

CONTROL：记录控制管理相关的信息，例如数据库初始化。

ELECTION：副本集选举相关信息

FTDC：（full-time diagnostic data ） 全程检测数据信息，例如Server的状态统计信息。3.2新增

GEO：解析地理空间模型相关信息。

INDEX：索引相关信息，例如索引的创建过程信息。

INITSYNC：初始化同步操作相关信息

JOURNAL：日志相关的信息

NETWORK：网络相关信息，例如网络连接信息。

QUERY：查询相关信息，例如查询计划信息。

REPL：副本集相关信息，包括：初始化同步，心疼，状态，回滚等信息，包括ELECTION，INITSYSNC，REPL_HB和ROLLBACK。

REPL_HB：副本集心跳相关信息

ROLLBACK：回滚操作相关信息

SHARDING：分片相关信息，例如mongos的启动信息

STORAGE：存储相关信息，例如将 storage 层的数据刷入磁盘的信息。

TXN：多文档事务相关信息，4.0.2新增

RECOVERY：还原活动相关的信息

WRITE：写操作相关的信息，例如更新（update）的命令。

Context：产生该日志事件的线程名称

id：日志语句的独一无二的编号

Message：日志事件详细信息

Attributes：(可选)附件信息，也就是发生该日志事件时的相关对象属性，例如：操作系统版本，端口号，pid进程号等。

Tags：标签

Truncated ：日志截断信息

Size：发生日志截断时，之前的日志文件大小。

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