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awslogs日志驅(qū)動程序發(fā)送集裝箱日志亞馬遜 CloudWatch 的日志。可以通過 AWS 管理控制臺或 AWS 開發(fā)工具包和命令行工具檢索日志條目。

用法

要將awslogs驅(qū)動程序用作默認(rèn)日志記錄驅(qū)動程序,請將log-driverlog-opt鍵設(shè)置為daemon.json位于 Linux 主機/etc/docker/或 Windows Server 上C:\ProgramData\docker\config\daemon.json的文件中的適當(dāng)值。有關(guān)使用Docker 配置的更多信息daemon.json,請參閱 daemon.json 。以下示例將日志驅(qū)動程序awslogs設(shè)置為并設(shè)置該awslogs-region選項。

{  "log-driver": "awslogs",  "log-opts": {    "awslogs-region": "us-east-1"  }}

重新啟動 Docker 以使更改生效。

您可以使用以下--log-driver選項來設(shè)置特定容器的日志記錄驅(qū)動程序docker run

docker run --log-driver=awslogs ...

Amazon CloudWatch Logs 選項

您可以添加日志記錄選項以daemon.json設(shè)置 Docker 范圍的默認(rèn)值,或者在啟動容器時使用--log-opt NAME=VALUE標(biāo)志指定 Amazon CloudWatch Logs 日志記錄驅(qū)動程序選項。

awslog-區(qū)域

awslogs日志驅(qū)動程序發(fā)送您的 Docke 日志的特定區(qū)域。使用awslogs-region日志選項或AWS_REGION環(huán)境變量來設(shè)置區(qū)域。默認(rèn)情況下,如果Docker守護進程在 EC2 實例上運行,并且沒有設(shè)置區(qū)域,則驅(qū)動程序使用實例的區(qū)域。

docker run --log-driver=awslogs --log-opt awslogs-region=us-east-1 ...

awslog-組

您必須指定一個日志組為awslogs日志驅(qū)動程序。您可以使用awslogs-group日志選項指定日志組:

docker run --log-driver=awslogs --log-opt awslogs-region=us-east-1 --log-opt awslogs-group=myLogGroup ...

awslog-流

要配置應(yīng)該使用哪個日志流,您可以指定awslogs-stream日志選項。如果未指定,則將容器標(biāo)識 ID 用作日志流。

注意:給定日志組內(nèi)的日志流一次只能由一個容器使用。同時為多個容器使用相同的日志流可能會導(dǎo)致日志記錄性能下降。

awslogs-創(chuàng)建-組

如果日志組不存在,日志驅(qū)動程序?qū)⒛J(rèn)返回錯誤。但是,您可以將根據(jù)awslogs-create-group需要設(shè)置true為自動創(chuàng)建日志組。awslogs-create-group選項默認(rèn)為false。

$ docker run --log-driver=awslogs \             --log-opt awslogs-region=us-east-1 \             --log-opt awslogs-group=myLogGroup \             --log-opt awslogs-create-group=true \             ...

注意:在嘗試使用awslogs-create-group之前,您的 AWS IAM 策略必須包含  logs:CreateLogGroup權(quán)限。

awslogs-日期時間-格式

awslogs-datetime-format選項定義了Python strftime格式的多行起始模式。日志消息由與模式匹配的行和與模式不匹配的任何后續(xù)行組成。因此匹配的行是日志消息之間的分隔符。

使用此格式的用例的一個示例是解析輸出,如堆棧轉(zhuǎn)儲,否則可能會記錄在多個條目中。正確的模式允許它在一個條目中被捕獲。

如果awslogs-datetime-formatawslogs-multiline-pattern兩者都配置,則此選項始終優(yōu)先。

注意:多行日志記錄會執(zhí)行所有日志消息的正則表達(dá)式解析和匹配,這可能會對日志記錄性能產(chǎn)生負(fù)面影響。

考慮以下日志流,其中新的日志消息以時間戳開始:

[May 01, 2017 19:00:01] A message was logged[May 01, 2017 19:00:04] Another multiline message was logged
Some random messagewith some random words[May 01, 2017 19:01:32] Another message was logged

格式可以表達(dá)為一個strftime表達(dá)式[%b %d, %Y %H:%M:%S],并且awslogs-datetime-format可以將該值設(shè)置為該表達(dá)式:

$ docker run --log-driver=awslogs \             --log-opt awslogs-region=us-east-1 \             --log-opt awslogs-group=myLogGroup \             --log-opt awslogs-datetime-format='[%b %d, %Y %H:%M:%S]' \             ...

這會將日志解析到以下 CloudWatch 日志事件中:

# First event[May 01, 2017 19:00:01] A message was logged

# Second event[May 01, 2017 19:00:04] Another multiline message was logged
Some random messagewith some random words

# Third event[May 01, 2017 19:01:32] Another message was logged

支持以下strftime代碼:

代碼

含義

示例

%a

平日縮寫名稱。

Mon

%A

平日全名。

Monday

%w

平日為十進制數(shù)字,其中0表示星期日,6表示星期六。

0

%d

一個月中的一天作為零填充的十進制數(shù)字。

08

%b

月縮寫名稱。

Feb

%B

月份全名。

February

%M

月份作為零填充十進制數(shù)字。

02

%Y

世紀(jì)作為十進制數(shù)字。

2008

%y

沒有世紀(jì)的一年是一個零填充的十進制數(shù)。

08

%H

小時(24小時制)作為零填充十進制數(shù)字。

19

%I

小時(12小時制)作為零填充的十進制數(shù)字。

07

%p

上午或下午。

AM

%M

分鐘作為零填充的十進制數(shù)字。

57

%S

其次作為零填充十進制數(shù)。

04

%L

毫秒為零填充的十進制數(shù)字。

123

%f

微秒作為零填充的十進制數(shù)字。

000345

%z

UTC偏移量格式為+ HHMM或-HHMM。

+1300

%Z

時區(qū)名稱。

PST

%j

一年中的一天為零填充的十進制數(shù)字。

363

awslogs-多-模式

awslogs-multiline-pattern選項使用正則表達(dá)式定義多行開始模式。日志消息由與模式匹配的行和與模式不匹配的任何后續(xù)行組成。因此匹配的行是日志消息之間的分隔符。

如果awslogs-datetime-format還配置了此選項,則忽略此選項。

注意:多行日志記錄對所有日志消息執(zhí)行正則表達(dá)式解析和匹配。這可能會對記錄性能產(chǎn)生負(fù)面影響。

例如,要處理以下日志流,新的日志消息從模式開始INFO*

考慮以下日志流,其中每條日志消息應(yīng)以 pattherINFO開頭:

INFO A message was logged
INFO Another multiline message was logged
     Some random message
INFO Another message was logged

你可以使用^INFO正則表達(dá)式:

$ docker run --log-driver=awslogs \             --log-opt awslogs-region=us-east-1 \             --log-opt awslogs-group=myLogGroup \             --log-opt awslogs-multiline-pattern='^INFO' \             ...

這會將日志解析到以下 CloudWatch 日志事件中:

# First event
INFO A message was logged

# Second event
INFO Another multiline message was logged
     Some random message

# Third event
INFO Another message was logged

標(biāo)簽

指定tag為選項的替代awslogs-stream選項。tag解釋模板標(biāo)記(例如{{.ID}},{{.FullID}}{{.Name}} docker.{{.ID}})。有關(guān)所有支持的模板替換的詳細(xì)信息,請參閱標(biāo)記選項文檔。

當(dāng)兩個awslogs-streamtag被指定,提供的awslogs-stream值將覆蓋與指定的tag模板。

如果未指定,則將容器標(biāo)識 ID 用作日志流。

注意:CloudWatch 日志 API 不支持:日志名稱。這可能會導(dǎo)致一些問題時使用{{ .ImageName }}作為標(biāo)記,因為泊塢窗圖像具有格式IMAGE:TAG,如alpine:latest。模板標(biāo)記可用于獲取正確的格式。要獲取圖像名稱和容器ID的前12個字符,可以使用:--log-opt tag='{{ with split .ImageName ":" }}{{join . "_"}}{{end}}-{{.ID}}'輸出結(jié)果如下所示:alpine_latest-bf0072049c76

證書

您必須向 Docker 守護程序(daemon)提供 AWS 憑證才能使用awslogs日志記錄驅(qū)動程序。您可以提供這些憑證用AWS_ACCESS_KEY_ID,AWS_SECRET_ACCESS_KEY以及AWS_SESSION_TOKEN環(huán)境變量,默認(rèn)的 AWS 共享的憑證文件(~/.aws/credentials根用戶),或(如果正在運行在 Amazon EC2 實例泊塢窗守護進程)的 Amazon EC2 實例配置文件。

憑證必須應(yīng)用允許logs:CreateLogStreamlogs:PutLogEvents采取的操作,如以下示例所示。

{  "Version": "2012-10-17",  "Statement": [    {      "Action": [        "logs:CreateLogStream",        "logs:PutLogEvents"      ],      "Effect": "Allow",      "Resource": "*"    }  ]}
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