AWS CodeBuild本地缓存无法实际缓存？

Question

我一直在尝试使AWS CodeBuild的本地缓存正常工作，而就我的一生而言，我什至无法使最基本的缓存正常工作。我的最终目标是缓存摇篮文物，如讨论在这里。

但是因为无法正常工作，所以我尝试了一个更简单的测试，在该测试中，我尝试/root/foo使用counter.txt每个构建都递增的文件来缓存目录。我的期望是，如果我在彼此之间的几分钟之内运行后续的构建，我会在日志中看到“ 2”，“ 3”等。但是实际情况是，尽管建立了符号链接，但下一个构建版本却看不到前一个counter.txt文件，这对我来说表明有些问题。

谁能确认他们的本地缓存实际上在CodeBuild中工作？我开始怀疑该功能当前是否损坏！还是我完全误解了该怎么办？

buildspec.yml：

version: 0.2

phases:
  install:
    runtime-versions:
      java: corretto8
  build:
    commands:
      - pwd
      - ls -l /root/
      - ls -l /root/foo/
      - ./cache-test.sh
      - ls -l /root/
      - ls -l /root/foo/

cache:
  paths:
    - '/root/foo/*'

cache-test.sh：

version: 0.2

phases:
  install:
    runtime-versions:
      java: corretto8
  build:
    commands:
      - pwd
      - ls -l /root/
      - ls -l /root/foo/
      - ./cache-test.sh
      - ls -l /root/
      - ls -l /root/foo/

cache:
  paths:
    - '/root/foo/*'

CodeBuild输出：（即使连续快速执行也具有相同的输出）

[Container] 2019/11/10 22:35:08 Waiting for agent ping 
[Container] 2019/11/10 22:35:10 Waiting for DOWNLOAD_SOURCE 
[Container] 2019/11/10 22:35:10 Phase is DOWNLOAD_SOURCE 
[Container] 2019/11/10 22:35:10 CODEBUILD_SRC_DIR=/codebuild/output/src905503483/src 
[Container] 2019/11/10 22:35:10 YAML location is /codebuild/output/src905503483/src/buildspec.yml 
[Container] 2019/11/10 22:35:10 No commands found for phase name: INSTALL 
[Container] 2019/11/10 22:35:10 Processing environment variables 
[Container] 2019/11/10 22:35:10 Moving to directory /codebuild/output/src905503483/src 
[Container] 2019/11/10 22:35:10 MkdirAll: /codebuild/local-cache/custom/de68c9f22ae028d4e4dfb0d11bbb481053d28b1373db0d6a56ebee0416bf13b2/root/foo 
[Container] 2019/11/10 22:35:10 Symlinking: /root/foo => /codebuild/local-cache/custom/de68c9f22ae028d4e4dfb0d11bbb481053d28b1373db0d6a56ebee0416bf13b2/root/foo 
[Container] 2019/11/10 22:35:10 Registering with agent 
[Container] 2019/11/10 22:35:10 Phases found in YAML: 2 
[Container] 2019/11/10 22:35:10  BUILD: 6 commands 
[Container] 2019/11/10 22:35:10  INSTALL: 0 commands 
[Container] 2019/11/10 22:35:10 Phase complete: DOWNLOAD_SOURCE State: SUCCEEDED 
[Container] 2019/11/10 22:35:10 Phase context status code:  Message:  
[Container] 2019/11/10 22:35:11 Entering phase INSTALL 
[Container] 2019/11/10 22:35:11 Running command echo "Installing corretto(OpenJDK) version 8 ..." 
Installing corretto(OpenJDK) version 8 ... 

[Container] 2019/11/10 22:35:11 Running command export JAVA_HOME="$JAVA_8_HOME" 

[Container] 2019/11/10 22:35:11 Running command export JRE_HOME="$JRE_8_HOME" 

[Container] 2019/11/10 22:35:11 Running command export JDK_HOME="$JDK_8_HOME" 

[Container] 2019/11/10 22:35:11 Running command for tool_path in "$JAVA_8_HOME"/bin/* "$JRE_8_HOME"/bin/*; 
 do tool=`basename "$tool_path"`; 
  if [ $tool != 'java-rmi.cgi' ]; 
  then 
   rm -f /usr/bin/$tool /var/lib/alternatives/$tool \ 
    && update-alternatives --install /usr/bin/$tool $tool $tool_path 20000; 
  fi; 
done 

[Container] 2019/11/10 22:35:11 Phase complete: INSTALL State: SUCCEEDED 
[Container] 2019/11/10 22:35:11 Phase context status code:  Message:  
[Container] 2019/11/10 22:35:11 Entering phase PRE_BUILD 
[Container] 2019/11/10 22:35:11 Phase complete: PRE_BUILD State: SUCCEEDED 
[Container] 2019/11/10 22:35:11 Phase context status code:  Message:  
[Container] 2019/11/10 22:35:11 Entering phase BUILD 
[Container] 2019/11/10 22:35:11 Running command pwd 
/codebuild/output/src905503483/src 

[Container] 2019/11/10 22:35:11 Running command ls -l /root/ 
total 4 
lrwxrwxrwx 1 root root 103 Nov 10 22:35 foo -> /codebuild/local-cache/custom/de68c9f22ae028d4e4dfb0d11bbb481053d28b1373db0d6a56ebee0416bf13b2/root/foo 

[Container] 2019/11/10 22:35:11 Running command ls -l /root/foo/ 
total 0 

[Container] 2019/11/10 22:35:11 Running command ./cache-test.sh 
cat: /root/foo/count.txt: No such file or directory 
********************************* 
********************************* 
Incrementing counter to 1 
********************************* 
********************************* 

[Container] 2019/11/10 22:35:11 Running command ls -l /root/ 
total 4 
lrwxrwxrwx 1 root root 103 Nov 10 22:35 foo -> /codebuild/local-cache/custom/de68c9f22ae028d4e4dfb0d11bbb481053d28b1373db0d6a56ebee0416bf13b2/root/foo 

[Container] 2019/11/10 22:35:11 Running command ls -l /root/foo/ 
total 4 
-rw-r--r-- 1 root root 2 Nov 10 22:35 count.txt 

[Container] 2019/11/10 22:35:11 Phase complete: BUILD State: SUCCEEDED 
[Container] 2019/11/10 22:35:11 Phase context status code:  Message:  
[Container] 2019/11/10 22:35:11 Entering phase POST_BUILD 
[Container] 2019/11/10 22:35:11 Phase complete: POST_BUILD State: SUCCEEDED 
[Container] 2019/11/10 22:35:11 Phase context status code:  Message:  

CodeBuild项目JSON：

{
    "projects": [
        {
            "name": "test-project",
            "arn": "arn:aws:codebuild:us-east-2:xxx:project/xxx",
            "source": {
                "type": "CODEPIPELINE",
                "insecureSsl": false
            },
            "secondarySourceVersions": [],
            "artifacts": {
                "type": "CODEPIPELINE",
                "name": "test-project",
                "packaging": "NONE",
                "encryptionDisabled": false
            },
            "secondaryArtifacts": [],
            "cache": {
                "type": "LOCAL",
                "modes": [
                    "LOCAL_SOURCE_CACHE",
                    "LOCAL_CUSTOM_CACHE"
                ]
            },
            "environment": {
                "type": "LINUX_CONTAINER",
                "image": "aws/codebuild/amazonlinux2-x86_64-standard:1.0",
                "computeType": "BUILD_GENERAL1_SMALL",
                "environmentVariables": [],
                "privilegedMode": false,
                "imagePullCredentialsType": "CODEBUILD"
            },
            "serviceRole": "arn:aws:iam::xxx:role/service-role/xxx",
            "timeoutInMinutes": 60,
            "queuedTimeoutInMinutes": 480,
            "encryptionKey": "arn:aws:kms:us-east-2:xxx:alias/aws/s3",
            "tags": [],
            "created": 1573364156.631,
            "lastModified": 1573423155.674,
            "badge": {
                "badgeEnabled": false
            },
            "logsConfig": {
                "cloudWatchLogs": {
                    "status": "ENABLED",
                    "groupName": "xxx",
                    "streamName": "xxx"
                },
                "s3Logs": {
                    "status": "DISABLED",
                    "encryptionDisabled": false
                }
            }
        }
    ],
    "projectsNotFound": []
}

Answer 1

我一直试图让缓存自己工作，但成功有限。

不是来自任何公开来源，但这些是一些观察结果：

• 仅当构建时间超过 5 分钟时，缓存才可用。

• 如果新构建成功放置在同一构建主机上，则可以使用缓存。

• 如果新构建在上次构建后 5-15 分钟内运行，则可以使用缓存。缓存可能会根据上次构建时间保持可用，最多 15 分钟。

• 尽管构建超过 5 分钟，缓存可能并不总是工作，可能是因为构建被放置在不同的构建主机上。

• 此外，在缓存将新构建加速到 5 分钟以下的情况下，该构建将不会被缓存，从而导致后续未命中。

虽然我相信 CodeBuild 工程师有充分的理由以这种方式设计它，但在我看来，上述限制使得这种本地缓存功能的使用受到限制。

Answer 2

文档并不完全清楚，但 AWS CodeBuild 本地缓存只能缓存目录（截至撰写本文时）。这有点令人困惑，因为 AWS CodeBuild 构建规范规范允许路径是单个文件或通配符，但实际上指定文件会产生错误。

Unable to initialize cache download: only directories can be cached locally: ...

在您的示例中，您使用将缓存指定为

cache:
  paths:
    - '/root/foo/*'

其中 * 将引用 foo 中的所有单个文件和文件夹，但只会缓存文件夹。

指定整个目录应该有效

cache:
  paths:
    - /root/foo/