{"id":62528,"date":"2021-04-16T22:51:32","date_gmt":"2021-04-16T14:51:32","guid":{"rendered":"http:\/\/www.zhushiyao.com\/?p=62528"},"modified":"2021-04-16T22:52:18","modified_gmt":"2021-04-16T14:52:18","slug":"a72e98411e","status":"publish","type":"post","link":"http:\/\/www.zhushiyao.com\/?p=62528","title":{"rendered":"\u56fe\u89e3 Docker \u67b6\u6784"},"content":{"rendered":"
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01 Docker \u7684\u603b\u4f53\u67b6\u6784<\/strong><\/span><\/h2>\n

Docker \u662f\u4e00\u4e2a C\/S \u6a21\u5f0f\u7684\u67b6\u6784\uff0c\u540e\u7aef\u662f\u4e00\u4e2a\u677e\u8026\u5408\u67b6\u6784\uff0c\u6a21\u5757\u5404\u53f8\u5176\u804c\u3002\u4e0b\u56fe\u662f\u5b83\u7684\u603b\u4f53\u67b6\u6784\u56fe\uff1a<\/p>\n

\"\u56fe\u89e3<\/p>\n

\n

1 \u7528\u6237\u662f\u4f7f\u7528 Docker Client \u4e0e Docker Daemon \u5efa\u7acb\u901a\u4fe1\uff0c\u5e76\u53d1\u9001\u8bf7\u6c42\u7ed9\u540e\u8005\u3002<\/p>\n

2 Docker Daemon \u4f5c\u4e3a Docker \u67b6\u6784\u4e2d\u7684\u4e3b\u4f53\u90e8\u5206\uff0c\u9996\u5148\u63d0\u4f9b Docker Server \u7684\u529f\u80fd\u4f7f\u5176\u53ef\u4ee5\u63a5\u53d7 Docker Client \u7684\u8bf7\u6c42\u3002<\/p>\n

3 Docker Engine \u6267\u884c Docker \u5185\u90e8\u7684\u4e00\u7cfb\u5217\u5de5\u4f5c\uff0c\u6bcf\u4e00\u9879\u5de5\u4f5c\u90fd\u662f\u4ee5\u4e00\u4e2a Job \u7684\u5f62\u5f0f\u7684\u5b58\u5728\u3002<\/p>\n

4 Job \u7684\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5f53\u9700\u8981\u5bb9\u5668\u955c\u50cf\u65f6\uff0c\u5219\u4ece Docker Registry \u4e2d\u4e0b\u8f7d\u955c\u50cf\uff0c\u5e76\u901a\u8fc7\u955c\u50cf\u7ba1\u7406\u9a71\u52a8 Graphdriver \u5c06\u4e0b\u8f7d\u955c\u50cf\u4ee5 Graph \u7684\u5f62\u5f0f\u5b58\u50a8\u3002<\/p>\n

5 \u5f53\u9700\u8981\u4e3a Docker \u521b\u5efa\u7f51\u7edc\u73af\u5883\u65f6\uff0c\u901a\u8fc7\u7f51\u7edc\u7ba1\u7406\u9a71\u52a8 Networkdriver \u521b\u5efa\u5e76\u914d\u7f6e Docker\u5bb9\u5668\u7f51\u7edc\u73af\u5883\u3002<\/p>\n

6 \u5f53\u9700\u8981\u9650\u5236 Docker \u5bb9\u5668\u8fd0\u884c\u8d44\u6e90\u6216\u6267\u884c\u7528\u6237\u6307\u4ee4\u7b49\u64cd\u4f5c\u65f6\uff0c\u5219\u901a\u8fc7 Execdriver \u6765\u5b8c\u6210\u3002<\/p>\n

7 Libcontainer \u662f\u4e00\u9879\u72ec\u7acb\u7684\u5bb9\u5668\u7ba1\u7406\u5305\uff0cNetworkdriver \u4ee5\u53ca Execdriver \u90fd\u662f\u901a\u8fc7 Libcontainer \u6765\u5b9e\u73b0\u5177\u4f53\u5bf9\u5bb9\u5668\u8fdb\u884c\u7684\u64cd\u4f5c\u3002<\/p>\n

02 Docker \u5404\u6a21\u5757\u7ec4\u4ef6\u5206\u6790<\/strong><\/span><\/h2>\n

\u00a0<\/strong><\/span><\/p>\n

2.1 Docker Client\u300c\u53d1\u8d77\u8bf7\u6c42\u300d<\/span><\/h3>\n

\u00a0<\/strong><\/span><\/p>\n

1 Docker Client \u662f \u548c Docker Daemon \u5efa\u7acb\u901a\u4fe1\u7684\u5ba2\u6237\u7aef\u3002\u7528\u6237\u4f7f\u7528\u7684\u53ef\u6267\u884c\u6587\u4ef6\u4e3a docker\uff08\u4e00\u4e2a\u547d\u4ee4\u884c\u53ef\u6267\u884c\u6587\u4ef6\uff09\uff0cdocker \u547d\u4ee4\u4f7f\u7528\u540e\u63a5\u53c2\u6570\u7684\u5f62\u5f0f\u6765\u5b9e\u73b0\u4e00\u4e2a\u5b8c\u6574\u7684\u8bf7\u6c42\u547d\u4ee4\uff08\u4f8b\u5982\uff1adocker images\uff0cdocker \u4e3a\u547d\u4ee4\u4e0d\u53ef\u53d8\uff0cimages \u4e3a\u53c2\u6570\u53ef\u53d8\uff09\u3002<\/p>\n

2 Docker Client \u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4e09\u79cd\u65b9\u5f0f\u548c Docker Daemon \u5efa\u7acb\u901a\u4fe1\uff1atcp:\/\/host:port\u3001unix:\/\/pathtosocket \u548c fd:\/\/socketfd<\/p>\n

3 Docker Client \u53d1\u9001\u5bb9\u5668\u7ba1\u7406\u8bf7\u6c42\u540e\uff0c\u7531 Docker Daemon \u63a5\u53d7\u5e76\u5904\u7406\u8bf7\u6c42\uff0c\u5f53 Docker Client \u63a5\u6536\u5230\u8fd4\u56de\u7684\u8bf7\u6c42\u76f8\u5e94\u5e76\u7b80\u5355\u5904\u7406\u540e\uff0cDocker Client \u4e00\u6b21\u5b8c\u6574\u7684\u751f\u547d\u5468\u671f\u5c31\u7ed3\u675f\u4e86\u3002(\u4e00\u6b21\u5b8c\u6574\u7684\u8bf7\u6c42\uff1a\u53d1\u9001\u8bf7\u6c42\u2192\u5904\u7406\u8bf7\u6c42\u2192\u8fd4\u56de\u7ed3\u679c)\uff0c\u4e0e\u4f20\u7edf\u7684 C\/S \u67b6\u6784\u8bf7\u6c42\u6d41\u7a0b\u5e76\u65e0\u4e0d\u540c\u3002<\/p>\n

2.2 Docker Daemon\uff08\u540e\u53f0\u5b88\u62a4\u8fdb\u7a0b\uff09<\/span><\/h3>\n

Docker daemon \u67b6\u6784\u56fe<\/p>\n

\"\u56fe\u89e3<\/p>\n

\n

Docker Server \u67b6\u6784\u56fe<\/p>\n

\"\u56fe\u89e3<\/p>\n

\n

1 Docker Server \u76f8\u5f53\u4e8e C\/S \u67b6\u6784\u7684\u670d\u52a1\u7aef\u3002\u529f\u80fd\u4e3a\u63a5\u53d7\u5e76\u8c03\u5ea6\u5206\u53d1 Docker Client \u53d1\u9001\u7684\u8bf7\u6c42\u3002\u63a5\u53d7\u8bf7\u6c42\u540e\uff0cDocker Server \u901a\u8fc7\u8def\u7531\u4e0e\u5206\u53d1\u8c03\u5ea6\uff0c\u627e\u5230\u76f8\u5e94\u7684 Handler \u6765\u6267\u884c\u8bf7\u6c42\u3002<\/p>\n

2 \u5728 Docker \u7684\u542f\u52a8\u8fc7\u7a0b\u4e2d\uff0c\u901a\u8fc7\u5305 gorilla\/mux \u521b\u5efa\u4e86\u4e00\u4e2a mux.Router \u6765\u63d0\u4f9b\u8bf7\u6c42\u7684\u8def\u7531\u529f\u80fd\u3002\u5728 Golang \u4e2d gorilla\/mux \u662f\u4e00\u4e2a\u5f3a\u5927\u7684 URL \u8def\u7531\u5668\u4ee5\u53ca\u8c03\u5ea6\u5206\u53d1\u5668\u3002\u8be5 mux.Router \u4e2d\u6dfb\u52a0\u4e86\u4f17\u591a\u7684\u8def\u7531\u9879\uff0c\u6bcf\u4e00\u4e2a\u8def\u7531\u9879\u7531 HTTP \u8bf7\u6c42\u65b9\u6cd5\uff08PUT\u3001POST\u3001GET \u6216DELETE\uff09\u3001URL\u3001Handler \u4e09\u90e8\u5206\u7ec4\u6210\u3002<\/p>\n

3 \u521b\u5efa\u5b8c mux.Router \u4e4b\u540e\uff0cDocker \u5c06 Server \u7684\u76d1\u542c\u5730\u5740\u4ee5\u53ca mux.Router \u4f5c\u4e3a\u53c2\u6570\u6765\u521b\u5efa\u4e00\u4e2a httpSrv=http.Server{}\uff0c\u6700\u7ec8\u6267\u884c httpSrv.Serve() \u4e3a\u8bf7\u6c42\u670d\u52a1\u3002<\/p>\n

4 \u5728 Docker Server \u7684\u670d\u52a1\u8fc7\u7a0b\u4e2d\uff0cDocker Server \u5728 listener \u4e0a\u63a5\u53d7 Docker Client \u7684\u8bbf\u95ee\u8bf7\u6c42\uff0c\u5e76\u521b\u5efa\u4e00\u4e2a\u5168\u65b0\u7684 goroutine \u6765\u670d\u52a1\u8be5\u8bf7\u6c42\u3002\u5728 goroutine \u4e2d\uff0c\u9996\u5148\u8bfb\u53d6\u8bf7\u6c42\u5185\u5bb9\u5e76\u505a\u89e3\u6790\u5de5\u4f5c\uff0c\u63a5\u7740\u627e\u5230\u76f8\u5e94\u7684\u8def\u7531\u9879\u5e76\u8c03\u7528\u76f8\u5e94\u7684 Handler \u6765\u5904\u7406\u8be5\u8bf7\u6c42\uff0c\u6700\u540e Handler \u5904\u7406\u5b8c\u8bf7\u6c42\u4e4b\u540e\u56de\u590d\u8be5\u8bf7\u6c42\u3002<\/p>\n

2.3 Docker Engine<\/span><\/h3>\n

\u00a0<\/span><\/p>\n

5 Docker Engine \u662f Docker \u67b6\u6784\u4e2d\u7684\u8fd0\u884c\u5f15\u64ce\uff0c\u540c\u65f6\u4e5f Docker \u8fd0\u884c\u7684\u6838\u5fc3\u6a21\u5757\u3002\u5b83\u626e\u6f14 Docker Container \u5b58\u50a8\u4ed3\u5e93\u7684\u89d2\u8272\uff0c\u5e76\u4e14\u901a\u8fc7\u6267\u884c Job \u7684\u65b9\u5f0f\u6765\u64cd\u7eb5\u7ba1\u7406\u8fd9\u4e9b\u5bb9\u5668\u3002<\/p>\n

6 \u5728 Docker Engine \u6570\u636e\u7ed3\u6784\u7684\u8bbe\u8ba1\u4e0e\u5b9e\u73b0\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4e00\u4e2a Handler \u5bf9\u8c61\u3002\u8be5 Handler \u5bf9\u8c61\u5b58\u50a8\u7684\u90fd\u662f\u5173\u4e8e\u4f17\u591a\u7279\u5b9a Job \u7684 Handler \u5904\u7406\u8bbf\u95ee\u3002\u4e3e\u4f8b\u8bf4\u660e: Docker Engine \u7684Handler \u5bf9\u8c61\u4e2d\u6709\u4e00\u9879\u4e3a\uff1a{\u201ccreate\u201d: daemon.ContainerCreate,}\uff0c\u5219\u8bf4\u660e\u5f53\u540d\u4e3a\u201dcreate\u201d \u7684 Job \u5728\u8fd0\u884c\u65f6\uff0c\u6267\u884c\u7684\u662f daemon.ContainerCreate \u7684 Handler\u3002<\/p>\n

Job<\/strong><\/p>\n

1 \u4e00\u4e2a Job \u53ef\u4ee5\u8ba4\u4e3a\u662f Docker \u67b6\u6784\u4e2d Docker Engine \u5185\u90e8\u6700\u57fa\u672c\u7684\u5de5\u4f5c\u6267\u884c\u5355\u5143\u3002Docker \u53ef\u4ee5\u505a\u7684\u6bcf\u4e00\u9879\u5de5\u4f5c\uff0c\u90fd\u53ef\u4ee5\u62bd\u8c61\u4e3a\u4e00\u4e2a Job\u3002\u4f8b\u5982\uff1a\u5728\u5bb9\u5668\u5185\u90e8\u8fd0\u884c\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u8fd9\u662f\u4e00\u4e2a Job\uff1b\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bb9\u5668\uff0c\u8fd9\u662f\u4e00\u4e2a Job\u3002Docker Server \u7684\u8fd0\u884c\u8fc7\u7a0b\u4e5f\u662f\u4e00\u4e2a Job\uff0c\u540d\u4e3a ServeApi\u3002<\/p>\n

2 Job \u7684\u8bbe\u8ba1\u8005\uff0c\u628a Job \u8bbe\u8ba1\u5f97\u4e0e Unix \u8fdb\u7a0b\u76f8\u4eff\u3002\u6bd4\u5982\u8bf4\uff1aJob \u6709\u4e00\u4e2a\u540d\u79f0\u3001\u6709\u53c2\u6570\u3001\u6709\u73af\u5883\u53d8\u91cf\u3001\u6709\u6807\u51c6\u7684\u8f93\u5165\u8f93\u51fa\u3001\u6709\u9519\u8bef\u5904\u7406\uff0c\u6709\u8fd4\u56de\u72b6\u6001\u7b49\u3002<\/p>\n

2.4 Docker Registry(\u955c\u50cf\u6ce8\u518c\u4e2d\u5fc3)<\/span><\/h3>\n

\u00a0<\/span><\/p>\n

1 Docker Registry \u662f\u4e00\u4e2a\u5b58\u50a8\u5bb9\u5668\u955c\u50cf\u7684\u4ed3\u5e93\uff08\u6ce8\u518c\u4e2d\u5fc3\uff09\uff0c\u53ef\u7406\u89e3\u4e3a\u4e91\u7aef\u955c\u50cf\u4ed3\u5e93\u3002\u6309 Repository \u6765\u5206\u7c7b\uff0cdocker pull \u6309\u7167 [repository]:[tag] \u6765\u7cbe\u786e\u5b9a\u4e49\u4e00\u4e2a\u5177\u4f53\u7684 Image\u3002<\/p>\n

2 \u5728 Docker \u7684\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0cDocker Daemon \u4f1a\u4e0e Docker Registry \u901a\u4fe1\uff0c\u5e76\u5b9e\u73b0\u641c\u7d22\u955c\u50cf\u3001\u4e0b\u8f7d\u955c\u50cf\u3001\u4e0a\u4f20\u955c\u50cf\u4e09\u4e2a\u529f\u80fd\uff0c\u8fd9\u4e09\u4e2a\u529f\u80fd\u5bf9\u5e94\u7684 Job \u540d\u79f0\u5206\u522b\u4e3a\uff1a\u201csearch\u201d\u3001\u201dpull\u201d \u4e0e \u201cpush\u201d\u3002<\/p>\n

3 Docker Registry \u53ef\u5206\u4e3a\u516c\u6709\u4ed3\u5e93\uff08 Docker Hub\uff09\u548c\u79c1\u6709\u4ed3\u5e93\u3002<\/p>\n

2.5 Graph \u300cDocker \u5185\u90e8\u6570\u636e\u5e93\u300d<\/span><\/h3>\n

Graph \u67b6\u6784\u56fe<\/p>\n

\"\u56fe\u89e3<\/p>\n

\n

Repository<\/strong><\/p>\n

1 \u5df2\u4e0b\u8f7d\u955c\u50cf\u7684\u4fdd\u7ba1\u8005\uff08\u5305\u62ec\u4e0b\u8f7d\u7684\u955c\u50cf\u548c\u901a\u8fc7 Dockerfile \u6784\u5efa\u7684\u955c\u50cf\uff09\u3002<\/p>\n

\u641c\u7d22\u516c\u4f17\u53f7\u9876\u7ea7\u67b6\u6784\u5e08\u56de\u590d\u5173\u952e\u5b57\u201c\u67b6\u6784\u6574\u6d01\u201d\uff0c\u83b7\u53d6\u4e00\u4efd\u60ca\u559c\u793c\u5305\u3002<\/p>\n

2 \u4e00\u4e2a Repository \u8868\u793a\u67d0\u7c7b\u955c\u50cf\u7684\u4ed3\u5e93\uff08\u4f8b\u5982\uff1aUbuntu\uff09\uff0c\u540c\u4e00\u4e2a Repository \u5185\u7684\u955c\u50cf\u7528 Tag \u6765\u533a\u5206\uff08\u8868\u793a\u540c\u4e00\u7c7b\u955c\u50cf\u7684\u4e0d\u540c\u6807\u7b7e\u6216\u7248\u672c\uff09\u3002\u4e00\u4e2a Registry \u5305\u542b\u591a\u4e2aRepository\uff0c\u4e00\u4e2a Repository \u5305\u542b\u540c\u7c7b\u578b\u7684\u591a\u4e2a Image\u3002<\/p>\n

3 \u955c\u50cf\u7684\u5b58\u50a8\u7c7b\u578b\u6709 Aufs\u3001Devicemapper\u3001Btrfs\u3001Vfs\u7b49\u3002\u5176\u4e2d CentOS \u7cfb\u7edf 7.x \u4ee5\u4e0b\u7248\u672c\u4f7f\u7528 Devicemapper \u7684\u5b58\u50a8\u7c7b\u578b\u3002<\/p>\n

4 \u540c\u65f6\u5728 Graph \u7684\u672c\u5730\u76ee\u5f55\u4e2d\u5b58\u50a8\u6709\u5173\u4e8e\u6bcf\u4e00\u4e2a\u7684\u5bb9\u5668\u955c\u50cf\u5177\u4f53\u4fe1\u606f\uff0c\u5305\u542b\u6709\uff1a\u8be5\u5bb9\u5668\u955c\u50cf\u7684\u5143\u6570\u636e\u3001\u5bb9\u5668\u955c\u50cf\u7684\u5927\u5c0f\u4fe1\u606f\u3001\u4ee5\u53ca\u8be5\u5bb9\u5668\u955c\u50cf\u6240\u4ee3\u8868\u7684\u5177\u4f53 rootfs\u3002<\/p>\n

GraphDB<\/strong><\/p>\n

1 \u5df2\u4e0b\u8f7d\u5bb9\u5668\u955c\u50cf\u4e4b\u95f4\u5173\u7cfb\u7684\u8bb0\u5f55\u8005\u3002<\/p>\n

2 GraphDB \u662f\u4e00\u4e2a\u6784\u5efa\u5728 SQLite \u4e4b\u4e0a\u7684\u5c0f\u578b\u6570\u636e\u5e93\uff0c\u5b9e\u73b0\u4e86\u8282\u70b9\u7684\u547d\u540d\u4ee5\u53ca\u8282\u70b9\u4e4b\u95f4\u5173\u8054\u5173\u7cfb\u7684\u8bb0\u5f55\u3002<\/p>\n

2.6 Driver \u300c\u6267\u884c\u90e8\u5206\u300d<\/span><\/h3>\n

Driver \u662f Docker \u67b6\u6784\u4e2d\u7684\u9a71\u52a8\u6a21\u5757\u3002\u901a\u8fc7 Driver \u9a71\u52a8\uff0cDocker \u53ef\u4ee5\u5b9e\u73b0\u5bf9 Docker \u5bb9\u5668\u6267\u884c\u73af\u5883\u7684\u5b9a\u5236\u3002\u5373 Graph \u8d1f\u8d23\u955c\u50cf\u7684\u5b58\u50a8\uff0cDriver \u8d1f\u8d23\u5bb9\u5668\u7684\u6267\u884c\u3002<\/p>\n

Graphdriver<\/strong><\/p>\n

Graphdriver \u67b6\u6784\u56fe<\/p>\n

\"\u56fe\u89e3<\/p>\n

\n

1 Graphdriver \u4e3b\u8981\u7528\u4e8e\u5b8c\u6210\u5bb9\u5668\u955c\u50cf\u7684\u7ba1\u7406\uff0c\u5305\u62ec\u5b58\u50a8\u4e0e\u83b7\u53d6\u3002<\/p>\n

2 \u5b58\u50a8\uff1adocker pull \u4e0b\u8f7d\u7684\u955c\u50cf\u7531 Graphdriver \u5b58\u50a8\u5230\u672c\u5730\u7684\u6307\u5b9a\u76ee\u5f55( Graph \u4e2d )\u3002<\/p>\n

3 \u83b7\u53d6\uff1adocker run\uff08create\uff09\u7528\u955c\u50cf\u6765\u521b\u5efa\u5bb9\u5668\u7684\u65f6\u5019\u7531 Graphdriver \u5230\u672c\u5730 Graph\u4e2d\u83b7\u53d6\u955c\u50cf\u3002<\/p>\n

Networkdriver<\/strong><\/p>\n

Networkdriver \u67b6\u6784\u56fe<\/p>\n

\"\u56fe\u89e3<\/p>\n

\n

Networkdriver \u7684\u7528\u9014\u662f\u5b8c\u6210 Docker \u5bb9\u5668\u7f51\u7edc\u73af\u5883\u7684\u914d\u7f6e\uff0c\u5176\u4e2d\u5305\u62ec:<\/p>\n