{"id":35518,"date":"2020-07-14T12:00:55","date_gmt":"2020-07-14T03:00:55","guid":{"rendered":"https:\/\/www.creationline.com\/?p=35518"},"modified":"2023-01-26T20:36:27","modified_gmt":"2023-01-26T11:36:27","slug":"docker%e3%82%b3%e3%83%b3%e3%83%86%e3%83%8a%e3%81%ae%e3%83%95%e3%82%a1%e3%82%a4%e3%83%ab%e5%ae%9f%e4%bd%93%e3%81%a8%e8%82%a5%e5%a4%a7%e5%8c%96%e3%81%99%e3%82%8b-var-lib-docker-overlay2%e3%81%ae","status":"publish","type":"post","link":"https:\/\/www.creationline.com\/tech-blog\/cloudnative\/docker\/35518","title":{"rendered":"Docker\u30b3\u30f3\u30c6\u30ca\u306e\u30d5\u30a1\u30a4\u30eb\u5b9f\u4f53\u3068\u80a5\u5927\u5316\u3059\u308b\/var\/lib\/docker\/overlay2\u306e\u6b63\u4f53 #docker"},"content":{"rendered":"<div><center>\n\t\t<!--HubSpot Call-to-Action Code -->\n\t\t<span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-0906c216-e79d-4405-846e-acc3eb48e40f\">\n\t\t<span class=\"hs-cta-node hs-cta-0906c216-e79d-4405-846e-acc3eb48e40f\" id=\"0906c216-e79d-4405-846e-acc3eb48e40f\">\n\t\t<!--[if lte IE 8]>\n\t\t<div id=\"hs-cta-ie-element\"><\/div>\n\t\t<![endif]-->\n\t\t<a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/6168413\/0906c216-e79d-4405-846e-acc3eb48e40f\" >\n\t\t<img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-0906c216-e79d-4405-846e-acc3eb48e40f\" style=\"border-width:0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/6168413\/0906c216-e79d-4405-846e-acc3eb48e40f.png\"  alt=\"New call-to-action\"\/>\n\t\t<\/a>\n\t\t<\/span>\n\t\t<script charset=\"utf-8\" src=\"\/\/js.hubspot.com\/cta\/current.js\"><\/script>\n\t\t<script>\n\t\thbspt.cta.load(6168413, '0906c216-e79d-4405-846e-acc3eb48e40f', {});\n\t\t<\/script>\n\t\t<\/span>\n\t\t<!-- end HubSpot Call-to-Action Code -->\n\t\t<\/center><\/div>\n<h2>\u306f\u3058\u3081\u306b<\/h2>\n<p>\u5148\u65e5\u306b\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\u304c\u5b9f\u65bd\u3057\u305f Docker Fundamental Training \u306b\u3066\u3001Docker\u30b3\u30f3\u30c6\u30ca\u306b\u542b\u307e\u308c\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u5b9f\u4f53\u306b\u3064\u3044\u3066\u3054\u8cea\u554f\u3092\u9802\u304d\u307e\u3057\u305f\u3002\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u306e\u4e2d\u3067\u56de\u7b54\u3092\u5dee\u3057\u4e0a\u3052\u305f\u306e\u3067\u3059\u304c\u3001\u610f\u5916\u3068\u307e\u3068\u307e\u3063\u305f\u60c5\u5831\u304c\u306a\u3044\u306a\u3068\u601d\u3044\u307e\u3057\u3066\u3001\u3053\u3061\u3089\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<p>\u9802\u3044\u305f\u8cea\u554f\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059(\u4e00\u90e8\u629c\u7c8b\/\u7de8\u96c6\u3057\u3066\u3044\u307e\u3059)\u3002<br \/>\n\u524d\u63d0\u3068\u3057\u3066\u3001Storage Driver \u306b\u306f overlay2 \u3092\u63a1\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<blockquote>\n<p>\u30b3\u30f3\u30c6\u30ca\u3092\u8d77\u52d5\u3057\u3001\u305d\u306e\u4e2d\u306b\u5927\u304d\u306a\u5bb9\u91cf\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u5b58\u3057\u305f\u5834\u5408\u3001\u5b9f\u969b\u306b\u306f\u3069\u3053\u306e\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u304c\u6d88\u8cbb\u3055\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u8907\u6570\u306e\u30b3\u30f3\u30c6\u30ca\u3092\u8d77\u52d5\u3057\u305f\u6642\u306b\u3001\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u305d\u308c\u305e\u308c \/var\/lib\/docker\/overlay2 \u306b\u66f8\u304d\u8fbc\u307e\u308c\u307e\u3059\u304b\uff1f\u305d\u308c\u3068\u3082\u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u306e\u4e2d\u8eab\u306b\u66f8\u304d\u8fbc\u307e\u308c\u305f\u30c7\u30fc\u30bf\u3060\u3051\u304c \/var\/lib\/docker\/overlay2 \u306b\u4f5c\u3089\u308c\u307e\u3059\u304b\uff1f<\/p>\n<\/blockquote>\n<p>Docker\u30b3\u30f3\u30c6\u30ca\u306f\u591a\u5c64\u306e\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u306e\u91cd\u306d\u5408\u308f\u305b\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u308b...\u3068\u3044\u3046\u8aac\u660e\u306b\u5bfe\u3057\u3066\u9802\u3044\u305f\u8cea\u554f\u3067\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u306e\u5b9f\u4f53\u3068\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u306b\u3064\u3044\u3066\u3001\u5b9f\u969b\u306e\u3068\u3053\u308d\u3069\u3046\u306a\u3063\u3066\u3044\u308b\u306e\u304b\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n<h2>Storage Driver \u3068 overlay2 \u306b\u3064\u3044\u3066<\/h2>\n<p>\u307e\u305a\u3001Docker \u30b3\u30f3\u30c6\u30ca\u306f\u8907\u6570\u306e Readonly \u306a\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u3068\u3001Writable \u306a\u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u30d9\u30fc\u30b9\u3068\u306a\u308b Docker Image \u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u3053\u3068\u306a\u304f\u3001\u5b89\u5168\u306b\u304b\u3064\u52b9\u7387\u7684\u306b\u30b3\u30f3\u30c6\u30ca\u5185\u90e8\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u66f8\u304d\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<br \/>\n<div id=\"attachment_35527\" style=\"width: 685px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-35527\" src=\"\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/container-layers.jpg\" alt=\"https:\/\/docs.docker.com\/storage\/storagedriver\/#images-and-layers\" width=\"675\" height=\"469\" class=\"size-full wp-image-35527\" srcset=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/container-layers.jpg 675w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/container-layers-360x250.jpg 360w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/container-layers-280x195.jpg 280w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/container-layers-430x300.jpg 430w\" sizes=\"auto, (max-width: 675px) 100vw, 675px\" \/><p id=\"caption-attachment-35527\" class=\"wp-caption-text\"><a href=\"https:\/\/docs.docker.com\/storage\/storagedriver\/#images-and-layers\">https:\/\/docs.docker.com\/storage\/storagedriver\/#images-and-layers<\/a><\/p><\/div><\/p>\n<p>\u3053\u306e\u4ed5\u7d44\u307f\u3092\u5b9f\u73fe\u3059\u308b\u306e\u304c Storage Driver \u3067\u3059\u3002overlay, aufs, device mapper, overlay2 \u306a\u3069\u306e\u9078\u629e\u80a2\u304c\u3042\u308a\u307e\u3059\u3002\u73fe\u5728\u306e Docker v19.03 \u3067\u306f overlay2 \u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u304b\u3064\u5229\u7528\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002overlay2 \u306f\u30ab\u30fc\u30cd\u30eb\u306e\u6a5f\u80fd\u3067\u3042\u308b overlayfs \u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>Docker with overlay2 \u306e\u6319\u52d5\u306b\u3064\u3044\u3066<\/h2>\n<p>Storage Driver \u306b overlay2 \u3092\u5229\u7528\u3057\u305f\u5834\u5408\u306b\u3001Docker\u30b3\u30f3\u30c6\u30ca\u306f\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u3092 LowerDir, \u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u3092UpperDir\u3068\u3057\u305f overlayfs \u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<div id=\"attachment_35528\" style=\"width: 764px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-35528\" src=\"\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/overlay_constructs.jpg\" alt=\"https:\/\/docs.docker.com\/storage\/storagedriver\/overlayfs-driver\/#how-the-overlay2-driver-works\" width=\"754\" height=\"193\" class=\"size-full wp-image-35528\" srcset=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/overlay_constructs.jpg 754w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/overlay_constructs-360x92.jpg 360w\" sizes=\"auto, (max-width: 754px) 100vw, 754px\" \/><p id=\"caption-attachment-35528\" class=\"wp-caption-text\"><a href=\"https:\/\/docs.docker.com\/storage\/storagedriver\/overlayfs-driver\/#how-the-overlay2-driver-works\">https:\/\/docs.docker.com\/storage\/storagedriver\/overlayfs-driver\/#how-the-overlay2-driver-works<\/a><br \/>\u203b\u753b\u50cf\u306foverlay\u306e\u8aac\u660e\u3067\u4f7f\u308f\u308c\u3066\u3044\u308b\u3082\u306e\u3067\u3059\u304c\u3001overlay2\u3067\u3082\u540c\u69d8\u3067\u3059\u3002<\/p><\/div>\n<p>\u4ee5\u4e0b\u3067\u306f\u3001\u5b9f\u969b\u306bDocker\u30a4\u30e1\u30fc\u30b8\u3092\u30d3\u30eb\u30c9\u3057\u3001\u30b3\u30f3\u30c6\u30ca\u3092\u5b9f\u884c\u3057\u305f\u969b\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u6319\u52d5\u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001\u3053\u3053\u3067\u306f\u4e0b\u8a18\u306e Dockerfile \u304b\u3089 Docker \u30a4\u30e1\u30fc\u30b8\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre>\r\nFROM alpine\r\n\r\nRUN touch aaa.txt\r\nRUN mkdir bbb\r\nWORKDIR bbb\r\nRUN touch ccc.txt\r\n\r\nENTRYPOINT [\"sleep\", \"10000\"]\r\n<\/pre>\n<p>\u3053\u308c\u3092\u30d3\u30eb\u30c9\u3057\u3066 docker image inspect \u3059\u308b\u3068\u3001\u5229\u7528\u3055\u308c\u3066\u3044\u308b\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u306e\u30d1\u30b9\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002Docker \u30a4\u30e1\u30fc\u30b8\u306f\u3001\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u5358\u4f4d\u3067 \/var\/lib\/docker\/overlay2\/ \u4ee5\u4e0b\u306b\u4fdd\u5b58\u3055\u308c\u307e\u3059\u3002<\/p>\n<pre>\r\nvagrant@workstation:~\/overlay2test$ docker image inspect overlay2test -f \"{{json .GraphDriver.Data}}\" | jq .\r\n{\r\n  \"LowerDir\": \"\/var\/lib\/docker\/overlay2\/<font color=blue>f952dda500cd5fe53365d14c27498f39bcd4ba19b65f75e12a7d1acbc33d3f60<\/font>\/diff:\/var\/lib\/docker\/overlay2\/<font color=green>58511fe87bd9872209b26843d021449bc89c512bcf45d5ebad0c45a7fe27ec4c<\/font>\/diff:\/var\/lib\/docker\/overlay2\/<font color=purple>2f3fa524adcbbc7c5fbb8450f4ba277bbae76f6cd8d4c09d3740633ef2f0eeed<\/font>\/diff\",\r\n  \"MergedDir\": \"\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/merged\",\r\n  \"UpperDir\": \"\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/diff\",\r\n  \"WorkDir\": \"\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/work\"\r\n}\r\n<\/pre>\n<p>\/var\/lib\/docker\/overlay2\/{hash\u5024} \u306e\u30d5\u30a9\u30eb\u30c0\u304c\u4f5c\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u5404hash\u5024\u306b\u3064\u3044\u3066\u6574\u7406\u3059\u308b\u3068\u3001\u4e0b\u8a18\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li><font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font> \u304c overlay2test \u30a4\u30e1\u30fc\u30b8\u306e\u6700\u4e0a\u4f4d\u30ec\u30a4\u30e4\u3067\u3042\u308a\u3001 MergedDir, UpperDir, WorkDir \u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b<\/li>\n<li><font color=blue>f952dda500cd5fe53365d14c27498f39bcd4ba19b65f75e12a7d1acbc33d3f60<\/font>, <font color=green>58511fe87bd9872209b26843d021449bc89c512bcf45d5ebad0c45a7fe27ec4c<\/font>, <font color=purple>2f3fa524adcbbc7c5fbb8450f4ba277bbae76f6cd8d4c09d3740633ef2f0eeed<\/font> \u306e3\u30ec\u30a4\u30e4\u304c LowerDir \u3068\u306a\u3063\u3066\u3044\u308b<\/li>\n<\/ul>\n<p>\u305d\u308c\u305e\u308c\u4e2d\u3092\u898b\u3066\u307f\u307e\u3059\u3002<br \/>\n\u307e\u305a\u306f\u6700\u4e0a\u4f4d\u306e <font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font> \u304b\u3089\u3002<\/p>\n<pre>\r\nroot@workstation:~# ls -liR \/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/\r\n\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/:\r\ntotal 16\r\n1080163 -rw------- 1 root root    0 Jun 26 07:42 committed\r\n1338827 drwxr-xr-x 3 root root 4096 Jun 26 07:42 diff\r\n1080198 -rw-r--r-- 1 root root   26 Jun 26 07:42 link\r\n1080199 -rw-r--r-- 1 root root   86 Jun 26 07:42 lower\r\n1338828 drwx------ 2 root root 4096 Jun 26 07:42 work\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/diff:\r\ntotal 4\r\n1338831 drwxr-xr-x 2 root root 4096 Jun 26 07:42 bbb\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/diff\/bbb:\r\ntotal 0\r\n1338832 -rw-r--r-- 1 root root 0 Jun 26 07:42 ccc.txt\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/work:\r\ntotal 0\r\n<\/pre>\n<p>diff \u914d\u4e0b\u306b bbb\/ccc.txt \u304c\u5b58\u5728\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u5b9f\u306f MergedDir \u306f\u5b58\u5728\u3057\u3066\u307e\u305b\u3093\u3002<br \/>\n\u4ed6\u306e\u30ec\u30a4\u30e4\u3082 diff \u914d\u4e0b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<pre>\r\nroot@workstation:~# ls -liR \/var\/lib\/docker\/overlay2\/<font color=blue>f952dda500cd5fe53365d14c27498f39bcd4ba19b65f75e12a7d1acbc33d3f60<\/font>\/diff\/\r\n\/var\/lib\/docker\/overlay2\/<font color=blue>f952dda500cd5fe53365d14c27498f39bcd4ba19b65f75e12a7d1acbc33d3f60<\/font>\/diff\/:\r\ntotal 4\r\n1080190 drwxr-xr-x 2 root root 4096 Jun 26 07:42 bbb\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=blue>f952dda500cd5fe53365d14c27498f39bcd4ba19b65f75e12a7d1acbc33d3f60<\/font>\/diff\/bbb:\r\ntotal 0\r\n<\/pre>\n<p>bbb \u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304c\u3002<\/p>\n<pre>\r\nroot@workstation:~# ls -liR \/var\/lib\/docker\/overlay2\/<font color=green>58511fe87bd9872209b26843d021449bc89c512bcf45d5ebad0c45a7fe27ec4c<\/font>\/diff\r\n\/var\/lib\/docker\/overlay2\/<font color=green>58511fe87bd9872209b26843d021449bc89c512bcf45d5ebad0c45a7fe27ec4c<\/font>\/diff:\r\ntotal 0\r\n1080154 -rw-r--r-- 1 root root 0 Jun 26 07:42 aaa.txt\r\n<\/pre>\n<p>aaa.txt \u304c\u3002<\/p>\n<pre>\r\nroot@workstation:~# ls -li \/var\/lib\/docker\/overlay2\/<font color=purple>2f3fa524adcbbc7c5fbb8450f4ba277bbae76f6cd8d4c09d3740633ef2f0eeed<\/font>\/diff\r\ntotal 68\r\n1025519 drwxr-xr-x  2 root root 4096 May 29 14:20 bin\r\n1025636 drwxr-xr-x  2 root root 4096 May 29 14:20 dev\r\n1025637 drwxr-xr-x 15 root root 4096 May 29 14:20 etc\r\n1025711 drwxr-xr-x  2 root root 4096 May 29 14:20 home\r\n1025712 drwxr-xr-x  7 root root 4096 May 29 14:20 lib\r\n1025730 drwxr-xr-x  5 root root 4096 May 29 14:20 media\r\n1025734 drwxr-xr-x  2 root root 4096 May 29 14:20 mnt\r\n1025735 drwxr-xr-x  2 root root 4096 May 29 14:20 opt\r\n1025736 dr-xr-xr-x  2 root root 4096 May 29 14:20 proc\r\n1025737 drwx------  2 root root 4096 May 29 14:20 root\r\n1025738 drwxr-xr-x  2 root root 4096 May 29 14:20 run\r\n1025739 drwxr-xr-x  2 root root 4096 May 29 14:20 sbin\r\n1025801 drwxr-xr-x  2 root root 4096 May 29 14:20 srv\r\n1025802 drwxr-xr-x  2 root root 4096 May 29 14:20 sys\r\n1025803 drwxrwxrwt  2 root root 4096 May 29 14:20 tmp\r\n1025804 drwxr-xr-x  7 root root 4096 May 29 14:20 usr\r\n1026026 drwxr-xr-x 12 root root 4096 May 29 14:20 var\r\n<\/pre>\n<p>\u3053\u308c\u306f alpine \u3067\u3059\u306d\u3002\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u5404\u30ec\u30a4\u30e4\u306b\u30d5\u30a1\u30a4\u30eb\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u3092 docker container run \u3057\u3066\u4f5c\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre>\r\nroot@workstation:~# docker container run -d overlay2test\r\nbd036f606aa46144276ed5d4bdf6c4eafb26dbc5134529a90ce7a334c5591ff4\r\n\r\nroot@workstation:~# docker container ls\r\nCONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES\r\nbd036f606aa4        overlay2test        \"sleep 10000\"       47 seconds ago      Up 46 seconds                           modest_chatterjee\r\n<\/pre>\n<p>docker container inspect \u3067\u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre>\r\nroot@workstation:~# docker container inspect modest_chatterjee -f \"{{json .GraphDriver.Data}}\" | jq .\r\n{\r\n  \"LowerDir\": \"\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/diff:\/var\/lib\/docker\/overlay2\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/diff:\/var\/lib\/docker\/overlay2\/<font color=blue>f952dda500cd5fe53365d14c27498f39bcd4ba19b65f75e12a7d1acbc33d3f60<\/font>\/diff:\/var\/lib\/docker\/overlay2\/<font color=green>58511fe87bd9872209b26843d021449bc89c512bcf45d5ebad0c45a7fe27ec4c<\/font>\/diff:\/var\/lib\/docker\/overlay2\/<font color=purple>2f3fa524adcbbc7c5fbb8450f4ba277bbae76f6cd8d4c09d3740633ef2f0eeed<\/font>\/diff\",\r\n  \"MergedDir\": \"\/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/merged\",\r\n  \"UpperDir\": \"\/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/diff\",\r\n  \"WorkDir\": \"\/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/work\"\r\n}\r\n<\/pre>\n<p>LowerDir \u306b\u3001\u5148\u307b\u3069\u30a4\u30e1\u30fc\u30b8\u3067\u78ba\u8a8d\u3057\u305f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304c\u683c\u7d0d\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br \/>\n<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font> \u3068 <font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font> \u304c\u4eca\u56de\u306e\u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u306b\u95a2\u308f\u308b\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3067\u3059\u3002<\/p>\n<p>\u4e2d\u3092\u898b\u308b\u524d\u306b\u3001\u30b3\u30f3\u30c6\u30ca\u306b\u66f8\u304d\u8fbc\u3093\u3067\u307f\u307e\u3059\u3002<\/p>\n<pre>\r\nroot@workstation:~# docker container exec modest_chatterjee touch ddd.txt\r\n<\/pre>\n<p>\u3067\u306f\u3001\u4e2d\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002\u307e\u305a\u3001<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font> \u304b\u3089\u3002<\/p>\n<pre>\r\nroot@workstation:~# ls -liR \/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/:\r\ntotal 16\r\n1338886 -rw------- 1 root root    0 Jun 26 08:49 committed\r\n1338867 drwxr-xr-x 4 root root 4096 Jun 26 08:49 diff\r\n1338868 -rw-r--r-- 1 root root   26 Jun 26 08:49 link\r\n1338870 -rw-r--r-- 1 root root  115 Jun 26 08:49 lower\r\n1338869 drwx------ 3 root root 4096 Jun 26 08:49 work\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/diff:\r\ntotal 8\r\n1338874 drwxr-xr-x 4 root root 4096 Jun 26 08:49 dev\r\n1338873 drwxr-xr-x 2 root root 4096 Jun 26 08:49 etc\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/diff\/dev:\r\ntotal 8\r\n1338876 -rwxr-xr-x 1 root root    0 Jun 26 08:49 console\r\n1338877 drwxr-xr-x 2 root root 4096 Jun 26 08:49 pts\r\n1338879 drwxr-xr-x 2 root root 4096 Jun 26 08:49 shm\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/diff\/dev\/pts:\r\ntotal 0\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/diff\/dev\/shm:\r\ntotal 0\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/diff\/etc:\r\ntotal 0\r\n1338875 -rwxr-xr-x 1 root root  0 Jun 26 08:49 hostname\r\n1338883 -rwxr-xr-x 1 root root  0 Jun 26 08:49 hosts\r\n1338878 lrwxrwxrwx 1 root root 12 Jun 26 08:49 mtab -> \/proc\/mounts\r\n1338881 -rwxr-xr-x 1 root root  0 Jun 26 08:49 resolv.conf\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/work:\r\ntotal 4\r\n1338872 d--------- 2 root root 4096 Jun 26 08:49 work\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/work\/work:\r\ntotal 0\r\n<\/pre>\n<p>hostname \u306a\u3069\u306e\u500b\u5225\u306e\u30b3\u30f3\u30c6\u30ca\u306b\u5fc5\u8981\u306a\u30d5\u30a1\u30a4\u30eb\u304c\u751f\u6210\u3055\u308c\u3001 LowerDir \u3068\u3057\u3066\u30ec\u30a4\u30e4\u304c\u51fa\u6765\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u7d9a\u3044\u3066\u3001<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font> \u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<pre>\r\nroot@workstation:~# ls -li \/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/\r\ntotal 20\r\n1338882 drwxr-xr-x 3 root root 4096 Jun 26 08:49 diff\r\n1338884 -rw-r--r-- 1 root root   26 Jun 26 08:49 link\r\n1338887 -rw-r--r-- 1 root root  144 Jun 26 08:49 lower\r\n1338867 drwxr-xr-x 1 root root 4096 Jun 26 08:49 merged\r\n1338885 drwx------ 3 root root 4096 Jun 26 08:49 work\r\n\r\nroot@workstation:~# ls -li \/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/merged\/\r\ntotal 72\r\n1080154 -rw-r--r--  1 root root    0 Jun 26 07:42 aaa.txt\r\n1338831 drwxr-xr-x  1 root root 4096 Jun 26 08:54 bbb\r\n1025519 drwxr-xr-x  2 root root 4096 May 29 14:20 bin\r\n1338874 drwxr-xr-x  1 root root 4096 Jun 26 08:49 dev\r\n1338873 drwxr-xr-x  1 root root 4096 Jun 26 08:49 etc\r\n1025711 drwxr-xr-x  2 root root 4096 May 29 14:20 home\r\n1025712 drwxr-xr-x  7 root root 4096 May 29 14:20 lib\r\n1025730 drwxr-xr-x  5 root root 4096 May 29 14:20 media\r\n1025734 drwxr-xr-x  2 root root 4096 May 29 14:20 mnt\r\n1025735 drwxr-xr-x  2 root root 4096 May 29 14:20 opt\r\n1025736 dr-xr-xr-x  2 root root 4096 May 29 14:20 proc\r\n1025737 drwx------  2 root root 4096 May 29 14:20 root\r\n1025738 drwxr-xr-x  2 root root 4096 May 29 14:20 run\r\n1025739 drwxr-xr-x  2 root root 4096 May 29 14:20 sbin\r\n1025801 drwxr-xr-x  2 root root 4096 May 29 14:20 srv\r\n1025802 drwxr-xr-x  2 root root 4096 May 29 14:20 sys\r\n1025803 drwxrwxrwt  2 root root 4096 May 29 14:20 tmp\r\n1025804 drwxr-xr-x  7 root root 4096 May 29 14:20 usr\r\n1026026 drwxr-xr-x 12 root root 4096 May 29 14:20 var\r\n\r\nroot@workstation:~# ls -li \/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/merged\/bbb\/\r\ntotal 0\r\n1338832 -rw-r--r-- 1 root root 0 Jun 26 07:42 ccc.txt\r\n1338890 -rw-r--r-- 1 root root 0 Jun 26 08:54 ddd.txt\r\n\r\nroot@workstation:~# ls -liR \/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/diff\/\r\n\/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/diff\/:\r\ntotal 4\r\n1338864 drwxr-xr-x 2 root root 4096 Jun 26 08:54 bbb\r\n\r\n\/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/diff\/bbb:\r\ntotal 0\r\n1338890 -rw-r--r-- 1 root root 0 Jun 26 08:54 ddd.txt\r\n<\/pre>\n<p>diff \u914d\u4e0b\u306b\u5148\u307b\u3069\u8ffd\u52a0\u3057\u305f ddd.txt \u304c\u914d\u7f6e\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001 ddd.txt \u306einode\u756a\u53f7\u304c diff \u3068 merge \u3067\u4e00\u81f4\u3057\u3066\u3044\u308b\u3053\u3068\u3001 aaa.txt \u306einode\u756a\u53f7\u304c\u5148\u306e\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u306b\u3042\u308b\u3082\u306e\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u4e8b\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>mount -l | grep overlay \u3067\u3001overlayfs \u304c\u305d\u308c\u305e\u308c\u306e\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u4f7f\u308f\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre>\r\nroot@workstation:~# mount -l | grep overlay\r\noverlay on \/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/merged type overlay (rw,relatime,lowerdir=\/var\/lib\/docker\/overlay2\/l\/<font color=chocolate>WZ4ETM3JIXL4SWNFGKGDOPFE6I<\/font>:\/var\/lib\/docker\/overlay2\/l\/4CRVZPACWNPDHU6VIJIXFHIK3A:\/var\/lib\/docker\/overlay2\/l\/QKWVGM2CLRHUX2Q7Y33UU4TSL3:\/var\/lib\/docker\/overlay2\/l\/VV6S7BCGVK3XRTOIHCJYSZ5PXH:\/var\/lib\/docker\/overlay2\/l\/XRB6JZMFMNR4PT4HEWGX7WQTEN,upperdir=\/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/diff,workdir=\/var\/lib\/docker\/overlay2\/<font color=orange>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09<\/font>\/work)\r\n\r\nlrwxrwxrwx 1 root root 77 Jun 26 08:49 \/var\/lib\/docker\/overlay2\/l\/<font color=chocolate>WZ4ETM3JIXL4SWNFGKGDOPFE6I<\/font> -> ..\/<font color=chocolate>80493e0448ace915e6e345f03f19bf67350f17de852b949716138a6dc3d28d09-init<\/font>\/diff\r\nroot@workstation:~# ls -l \/var\/lib\/docker\/overlay2\/l\/<font color=red>4CRVZPACWNPDHU6VIJIXFHIK3A<\/font>\r\nlrwxrwxrwx 1 root root 72 Jun 26 07:42 \/var\/lib\/docker\/overlay2\/l\/<font color=red>4CRVZPACWNPDHU6VIJIXFHIK3A<\/font> -> ..\/<font color=red>5da5f5376d357ba13dc6a5a60562fb2ebce3077758262ad5f0cd273b62e4cacc<\/font>\/diff\r\nroot@workstation:~# ls -l \/var\/lib\/docker\/overlay2\/l\/<font color=blue>QKWVGM2CLRHUX2Q7Y33UU4TSL3<\/font>\r\nlrwxrwxrwx 1 root root 72 Jun 26 07:42 \/var\/lib\/docker\/overlay2\/l\/<font color=blue>QKWVGM2CLRHUX2Q7Y33UU4TSL3<\/font> -> ..\/<font color=blue>f952dda500cd5fe53365d14c27498f39bcd4ba19b65f75e12a7d1acbc33d3f60<\/font>\/diff\r\nroot@workstation:~# ls -l \/var\/lib\/docker\/overlay2\/l\/<font color=green>VV6S7BCGVK3XRTOIHCJYSZ5PXH<\/font>\r\nlrwxrwxrwx 1 root root 72 Jun 26 07:42 \/var\/lib\/docker\/overlay2\/l\/<font color=green>VV6S7BCGVK3XRTOIHCJYSZ5PXH<\/font> -> ..\/<font color=green>58511fe87bd9872209b26843d021449bc89c512bcf45d5ebad0c45a7fe27ec4c<\/font>\/diff\r\nroot@workstation:~# ls -l \/var\/lib\/docker\/overlay2\/l\/<font color=purple>XRB6JZMFMNR4PT4HEWGX7WQTEN<\/font>\r\nlrwxrwxrwx 1 root root 72 Jun  8 02:56 \/var\/lib\/docker\/overlay2\/l\/<font color=purple>XRB6JZMFMNR4PT4HEWGX7WQTEN<\/font> -> ..\/<font color=purple>2f3fa524adcbbc7c5fbb8450f4ba277bbae76f6cd8d4c09d3740633ef2f0eeed<\/font>\/diff\r\n\r\n<\/pre>\n<h2>\u80a5\u5927\u5316\u3059\u308b \/var\/lib\/docker\/overlay2\/ \u306b\u3064\u3044\u3066<\/h2>\n<p>\u3057\u3070\u3057\u3070 Docker \u30b3\u30f3\u30c6\u30ca\u306e\u30c7\u30a3\u30b9\u30af\u6d88\u8cbb\u91cf\u3092\u8abf\u3079\u3066\u3088\u3046\u3068 du -sh \/var\/lib\/docker\/overlay2\/ \u3092\u3057\u3066\u3068\u3093\u3067\u3082\u306a\u3044\u5927\u304d\u3055\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>overlay2 \u3092\u5229\u7528\u3057\u305f\u5834\u5408\u306b\u306f\u3001du -s \u306e\u5024\u3092<strong>\u4fe1\u7528\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093<\/strong>\u3002<\/p>\n<p>du -s \u306f overlayfs\u306b\u3088\u308b\u30de\u30a6\u30f3\u30c8\u3092<strong>\u533a\u5225\u3057\u307e\u305b\u3093<\/strong>\u3002<br \/>\n\u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u3092\u8abf\u3079\u305f\u5834\u5408\u306b\u3001\u5b9f\u4f53\u306f UpperDir \u306e\u307f\u304c\u305d\u306e\u30ec\u30a4\u30e4\u3067\u6d88\u8cbb\u3055\u308c\u3066\u3044\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u5b9f\u4f53\u3067\u3059\u304c\u3001 MergedDir \u3082\u542b\u3081\u3066\u3001\u3064\u307e\u308a\u306f\u30a4\u30e1\u30fc\u30b8\u30b5\u30a4\u30ba\u3092\u542b\u3081\u3066\u7b97\u51fa\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br \/>\n\/var\/lib\/docker\/overlay2 \u304c\u5bb9\u91cf\u3092\u5727\u8feb\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u8abf\u3079\u305f\u3044\u306e\u3067\u3042\u308c\u3070\u3001\u5b9f\u4f53\u3067\u3042\u308b UpperDir \u306e\u5024\u3092\u96c6\u8a08\u3059\u308b\u304b\u3001\u3042\u308b\u3044\u306f df \u306e\u5024\u3067\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305f\u306f docker system df \u306e\u30b3\u30de\u30f3\u30c9\u3067\u3082\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre>\r\nroot@workstation:~# du -sh \/var\/lib\/docker\/overlay2\/\r\n4.8G    \/var\/lib\/docker\/overlay2\/\r\n\r\nroot@workstation:~# df -h \/dev\/sda1\r\nFilesystem      Size  Used Avail Use% Mounted on\r\n\/dev\/sda1        30G   20G  9.4G  68% \/\r\n\r\nroot@workstation:~# for i in {1..50};do docker container run -d centos:7 sleep 1000; done\r\nfd503cfe6506f1862a6965a398c81cf0f9af584f61a503370de87e81efd7f9b7\r\n7e8586b176ffd05860b45889c12755338e14fa460c70ff8c543c6de6b1e7a01e\r\nccdf3c7e3081b8fdcfab4e46f880acdad20f2e7eda31a77269a48bdcfbd9eb93\r\n260d7c805b7bb36d8c16b05e11e3db0397a52db1b14bbacac6b3455a1a96962a\r\n...\r\n650193c83c7086e3d155980b3ab54d27746256b64529fe44419f27c79f8e1982\r\n1df926bc75ae07e52908b5aab30e6121a768d7ba3995e37ea143a1f905cc2035\r\n6df317c9aa84353ec358f72df8090aaf25879224f771f16079ae4aa9daa031c5\r\n\r\nroot@workstation:~# du -sh \/var\/lib\/docker\/overlay2\/\r\n16G     \/var\/lib\/docker\/overlay2\/\r\n\r\nroot@workstation:~# df -h \/dev\/sda1\r\nFilesystem      Size  Used Avail Use% Mounted on\r\n\/dev\/sda1        30G   20G  9.4G  68% \/\r\n\r\nroot@workstation:~# docker system df\r\nTYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE\r\nImages              27                  3                   4.416GB             3.813GB (86%)\r\nContainers          53                  50                  100.45MB             100.45MB (100%)\r\nLocal Volumes       0                   0                   0B                  0B\r\nBuild Cache         0                   0                   0B                  0B\r\n\r\n<\/pre>\n<p>df -h \u306e\u5024\u306f\u5909\u308f\u3063\u3066\u3044\u306a\u3044\u306e\u306b\u3001 du -sh \u306e\u5024\u304c\u6fc0\u5897\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30a4\u30e1\u30fc\u30b8\u30b5\u30a4\u30ba\u306e\u5927\u304d\u306a\u30b3\u30f3\u30c6\u30ca\u30921\u30ce\u30fc\u30c9\u3067\u5927\u91cf\u306b\u8d77\u52d5\u3057\u3066\u3044\u308b\u3068\u3001\u3053\u3046\u3044\u3063\u305f\u4e8b\u8c61\u306b\u76f4\u9762\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30a4\u30e1\u30fc\u30b8\u30b5\u30a4\u30ba\u304c\u5927\u304d\u304f\u306a\u304f\u3066\u3082\u3001\u4f8b\u3048\u3070 GitLab CI\/CD \u3067 Docker Executor \u3092\u5229\u7528\u3057\u3066\u5927\u91cf\u306b\u30b8\u30e7\u30d6\u3092\u56de\u3057\u3066\u3044\u308b\u5834\u5408\u306a\u3069\u3001\u7d42\u4e86\u3057\u305f\u30b3\u30f3\u30c6\u30ca\u304c\u5927\u91cf\u306b\u6e9c\u307e\u308b\u3053\u3068\u3067\u767a\u751f\u3057\u307e\u3059\u3002Kubernetes\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u7d42\u4e86\u3057\u305f\u30b3\u30f3\u30c6\u30ca\u304c\u81ea\u52d5\u3067\u524a\u9664\u3055\u308c\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u3042\u307e\u308a\u898b\u304b\u3051\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<br \/>\n\u4f55\u306b\u305b\u3088\u4f7f\u308f\u306a\u304f\u306a\u3063\u305f\u30b3\u30f3\u30c6\u30ca\u304c\u6e9c\u307e\u3063\u3066\u3044\u308b\u72b6\u614b\u306f\u826f\u304f\u3042\u308a\u307e\u305b\u3093\u306e\u3067\u3001\u5b9a\u671f\u7684\u306b docker prune \u3067\u7247\u3065\u3051\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001\u8cea\u554f\u306b\u5bfe\u3059\u308b\u56de\u7b54\u306f\u4e0b\u8a18\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<blockquote>\n<p>\u30b3\u30f3\u30c6\u30ca\u3092\u8d77\u52d5\u3057\u3001\u305d\u306e\u4e2d\u306b\u5927\u304d\u306a\u5bb9\u91cf\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4fdd\u5b58\u3057\u305f\u5834\u5408\u3001\u5b9f\u969b\u306b\u306f\u3069\u3053\u306e\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u304c\u6d88\u8cbb\u3055\u308c\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<\/blockquote>\n<p>\/var\/lib\/docker\/overlay2 \u306b\u30de\u30a6\u30f3\u30c8\u3055\u308c\u305f\u30c7\u30a3\u30b9\u30af\u306e\u5bb9\u91cf\u304c\u6d88\u8cbb\u3055\u308c\u307e\u3059\u3002<\/p>\n<blockquote>\n<p>\u8907\u6570\u306e\u30b3\u30f3\u30c6\u30ca\u3092\u8d77\u52d5\u3057\u305f\u6642\u306b\u3001\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u306e\u30d5\u30a1\u30a4\u30eb\u304c\u305d\u308c\u305e\u308c \/var\/lib\/docker\/overlay2 \u306b\u66f8\u304d\u8fbc\u307e\u308c\u307e\u3059\u304b\uff1f\u305d\u308c\u3068\u3082\u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u306e\u4e2d\u8eab\u306b\u66f8\u304d\u8fbc\u307e\u308c\u305f\u30c7\u30fc\u30bf\u3060\u3051\u304c \/var\/lib\/docker\/overlay2 \u306b\u4f5c\u3089\u308c\u307e\u3059\u304b\uff1f<\/p>\n<\/blockquote>\n<p>\u30b3\u30f3\u30c6\u30ca\u8d77\u52d5\u6642\u306b\u306f\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u306e\u30d5\u30a1\u30a4\u30eb\u306f\u66f8\u304d\u8fbc\u307e\u308c\u307e\u305b\u3093\u3002\u30a4\u30e1\u30fc\u30b8\u30ec\u30a4\u30e4\u306e\u30d5\u30a1\u30a4\u30eb\u306f build \u3084 pull \u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u66f8\u304d\u8fbc\u307e\u308c\u307e\u3059\u3002\u30b3\u30f3\u30c6\u30ca\u30ec\u30a4\u30e4\u306e\u4e2d\u8eab\u306b\u66f8\u304d\u8fbc\u307e\u308c\u305f\u30c7\u30fc\u30bf\u3060\u3051\u304c \/var\/lib\/docker\/overlay2 \u306b\u66f8\u304d\u8fbc\u307e\u308c\u307e\u3059\u3002<\/p>\n<h2>\u304a\u308f\u308a\u306b<\/h2>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001\u5f0a\u793e\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\u306e\u958b\u50ac\u3059\u308bDocker Fundamental Training\u3067\u9802\u3044\u305f\u8cea\u554f\u3068\u56de\u7b54\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3055\u305b\u3066\u9802\u304d\u307e\u3057\u305f\u3002\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\u3067\u306f\u3001Mirantis\u793e\u516c\u8a8d\u306eDocker Training\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002Docker\u306b\u3064\u3044\u3066\u3001\u30a4\u30e1\u30fc\u30b8\u306e\u4f5c\u6210\u304b\u3089Swarm\u3084Kubernetes\u306b\u3088\u308b\u30aa\u30fc\u30b1\u30b9\u30c8\u30ec\u30fc\u30b7\u30e7\u30f3\u307e\u3067\u3001\u30cf\u30f3\u30ba\u30aa\u30f3\u5f62\u5f0f\u3067\u57fa\u790e\u3092\u7db2\u7f85\u7684\u306b\u5b66\u7fd2\u3067\u304d\u308b2\u65e5\u9593\u306e\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3067\u3059\u3002<\/p>\n<p>\u958b\u50ac\u306e\u3054\u76f8\u8ac7\u3092\u627f\u3063\u3066\u304a\u308a\u307e\u3059\u306e\u3067\u3001\u8208\u5473\u304c\u3042\u308a\u307e\u3057\u305f\u3089<a href=\"\/docker\/training\">Docker\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u30b3\u30fc\u30b9<\/a>\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u306f\u3058\u3081\u306b \u5148\u65e5\u306b\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\u304c\u5b9f\u65bd\u3057\u305f Docker Fundamental Training \u306b\u3066\u3001Docker\u30b3\u30f3\u30c6\u30ca\u306b\u542b\u307e\u308c\u308b\u30d5\u30a1\u30a4\u30eb\u306e\u5b9f\u4f53\u306b\u3064\u3044\u3066\u3054\u8cea\u554f\u3092\u9802\u304d\u307e\u3057\u305f\u3002\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u306e\u4e2d\u3067\u56de\u7b54\u3092\u5dee\u3057\u4e0a\u3052\u305f\u306e\u3067 [&#8230;]<\/p>\n","protected":false},"author":1,"featured_media":35527,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[43,540],"tags":[],"class_list":["post-35518","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-docker","category-mirantis"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Docker\u30b3\u30f3\u30c6\u30ca\u306e\u30d5\u30a1\u30a4\u30eb\u5b9f\u4f53\u3068\u80a5\u5927\u5316\u3059\u308b\/var\/lib\/docker\/overlay2\u306e\u6b63\u4f53 #docker - Tech Blog\uff5c\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3<\/title>\n<meta name=\"description\" content=\"Docker, Mirantis |\u306f\u3058\u3081\u306b \u5148\u65e5\u306b\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\u304c\u5b9f\u65bd\u3057\u305f Docker Fundamental Training\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.creationline.com\/tech-blog\/cloudnative\/docker\/35518\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Docker\u30b3\u30f3\u30c6\u30ca\u306e\u30d5\u30a1\u30a4\u30eb\u5b9f\u4f53\u3068\u80a5\u5927\u5316\u3059\u308b\/var\/lib\/docker\/overlay2\u306e\u6b63\u4f53 #docker - Tech Blog\uff5c\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\" \/>\n<meta property=\"og:description\" content=\"Docker, Mirantis |\u306f\u3058\u3081\u306b \u5148\u65e5\u306b\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\u304c\u5b9f\u65bd\u3057\u305f Docker Fundamental Training\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.creationline.com\/tech-blog\/cloudnative\/docker\/35518\" \/>\n<meta property=\"og:site_name\" content=\"Tech Blog\uff5c\u30af\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u30e9\u30a4\u30f3\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/creationline\" \/>\n<meta property=\"article:published_time\" content=\"2020-07-14T03:00:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-01-26T11:36:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2020\/07\/container-layers.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"675\" \/>\n\t<meta property=\"og:image:height\" content=\"469\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@creationline\" \/>\n<meta name=\"twitter:site\" content=\"@creationline\" \/>\n<meta name=\"twitter:label1\" content=\"\u57f7\u7b46\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u63a8\u5b9a\u8aad\u307f\u53d6\u308a\u6642\u9593\" \/>\n\t<meta name=\"twitter:data2\" content=\"11\u5206\" \/>\n<script type=\"application\/ld+json\" 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