MongoDB4.4新特性-采用全新的JSON格式的日志

從4.4版本開始，MongoDB的​

​mongo​

​​和​

​mongos​

​日志檔案格式采用了JSON格式，更容易分析、解析。在此之前和其他日志檔案格式一樣，純文字輸出。

4.4日志格式

JSON格式更清晰，也更細分析、解析，非常友善。

{"t":{"$date":"2020-08-31T16:23:50.984+08:00"},"s":"I",  "c":"CONTROL",  "id":23285,   "ctx":"main","msg":"Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --
sslDisabledProtocols 'none'"}
{"t":{"$date":"2020-08-31T16:23:50.987+08:00"},"s":"W",  "c":"ASIO",     "id":22601,   "ctx":"main","msg":"No TransportLayer configured during NetworkInterface startup"}
{"t":{"$date":"2020-08-31T16:23:50.987+08:00"},"s":"I",  "c":"NETWORK",  "id":4648601, "ctx":"main","msg":"Implicit TCP FastOpen unavailable. If TCP FastOpen is required, set
 tcpFastOpenServer, tcpFastOpenClient, and tcpFastOpenQueueSize."}
{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I",  "c":"STORAGE",  "id":4615611, "ctx":"initandlisten","msg":"MongoDB starting","attr":{"pid":5836,"port":27017,"dbPath"
:"/usr/local/mongo4.4.0/data/db","architecture":"64-bit","host":"lei"}}
{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I",  "c":"CONTROL",  "id":23403,   "ctx":"initandlisten","msg":"Build Info","attr":{"buildInfo":{"version":"4.4.0","gitVer
sion":"563487e100c4215e2dce98d0af2a6a5a2d67c5cf","openSSLVersion":"OpenSSL 1.0.1e-fips 11 Feb 2013","modules":[],"allocator":"tcmalloc","environment":{"distmod":"rhel70","dis
tarch":"x86_64","target_arch":"x86_64"}}}}
{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I",  "c":"CONTROL",  "id":51765,   "ctx":"initandlisten","msg":"Operating System","attr":{"os":{"name":"CentOS Linux relea
se 7.5.1804 (Core) ","version":"Kernel 3.10.0-862.el7.x86_64"}}}
{"t":{"$date":"2020-08-31T16:23:50.988+08:00"},"s":"I",  "c":"CONTROL",  "id":21951,   "ctx":"initandlisten","msg":"Options set by command line","attr":{"options":{"config":"
/etc/mongo.conf","net":{"bindIp":"0.0.0.0","maxIncomingConnections":100,"port":27017},"processManagement":{"fork":true},"security":{"authorization":"enabled"},"storage":{"dbP
ath":"/usr/local/mongo4.4.0/data/db","engine":"wiredTiger","journal":{"enabled":true}},"systemLog":{"destination":"file","logAppend":true,"path":"/usr/local/mongo4.4.0/logs/m
ongodb.log"}}}}
{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"E",  "c":"STORAGE",  "id":20557,   "ctx":"initandlisten","msg":"DBException in initAndListen, terminating","attr":{"error"
:"NonExistentPath: Data directory /usr/local/mongo4.4.0/data/db not found. Create the missing directory or specify another path using (1) the --dbpath command line option, or
 (2) by adding the 'storage.dbPath' option in the configuration file."}}
{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I",  "c":"NETWORK",  "id":20562,   "ctx":"initandlisten","msg":"Shutdown: going to close listening sockets"}
{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I",  "c":"-",        "id":20520,   "ctx":"initandlisten","msg":"Stopping further Flow Control ticket acquisitions."}
{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I",  "c":"CONTROL",  "id":20565,   "ctx":"initandlisten","msg":"Now exiting"}
{"t":{"$date":"2020-08-31T16:23:50.989+08:00"},"s":"I",  "c":"CONTROL",  "id":23138,   "ctx":"initandlisten","msg":"Shutting down","attr":{"exitCode":100}}      

{
  "t": <Datetime>, // timestamp
  "s": <String>, // severity
  "c": <String>, // component
  "ctx": <String>, // context
  "id": <String>, // unique identifier
  "msg": <String>, // message body
  "attr": <Object> // additional attributes (optional)
  "tags": <Array of strings> // tags (optional)
  "truncated": <Object> // truncation info (if truncated)
  "size": <Integer> // original size of entry (if truncated)
}      

• Timestamp：時間戳，日志事件發生的時間
• Serverity：日志資訊等級

• F：Fatal
• E：Error
• W：Warning
• I：Information
• D1-D5：Debug級别，從4.2開始支援指定Debug級别。

• Compontents：日志事件的分類

• ACCESS：登入通路相關的資訊，例如登入驗證情況。
• COMMAND：資料庫執行指令相關資訊，例如，查詢。
• CONTROL：記錄控制管理相關的資訊，例如資料庫初始化。
• ELECTION：副本集選舉相關資訊
• FTDC：（full-time diagnostic data ） 全程檢測資料資訊，例如Server的狀态統計資訊。3.2新增
• GEO：解析地理空間模型相關資訊。
• INDEX：索引相關資訊，例如索引的建立過程資訊。
• INITSYNC：初始化同步操作相關資訊
• JOURNAL：日志相關的資訊
• NETWORK：網絡相關資訊，例如網絡連接配接資訊。
• QUERY：查詢相關資訊，例如查詢計劃資訊。
• REPL：副本集相關資訊，包括：初始化同步，心疼，狀态，復原等資訊，包括ELECTION，INITSYSNC，REPL_HB和ROLLBACK。
• REPL_HB：副本集心跳相關資訊
• ROLLBACK：復原操作相關資訊
• SHARDING：分片相關資訊，例如mongos的啟動資訊
• STORAGE：存儲相關資訊，例如将 storage 層的資料刷入磁盤的資訊。
• TXN：多文檔事務相關資訊，4.0.2新增
• RECOVERY：還原活動相關的資訊
• WRITE：寫操作相關的資訊，例如更新（update）的指令。

• Context：産生該日志事件的線程名稱
• id：日志語句的獨一無二的編号
• Message：日志事件詳細資訊
• Attributes：(可選)附件資訊，也就是發生該日志事件時的相關對象屬性，例如：作業系統版本，端口号，pid程序号等。
• Tags：标簽
• Truncated ：日志截斷資訊
• Size：發生日志截斷時，之前的日志檔案大小。