Docker 掛載 Volumes 的測試

Posted on by Clarence

docker 可以使用 --volumes-from 來使用另一個 docker 的資料夾，我製作了兩個範例來說明一個是不掛載本地資料夾的情況與掛載本地資料夾情況的差別

不掛載本地資料夾

它可以讀取到 docker 建立時的範例 HTML 檔案，並且也可以讀取到 sh 使用 curl 下載的檔案

掛載本地資料夾

但是如果掛載本地資料夾會因為掛載的資料夾覆蓋了 docker 資料夾造成只能讀取到 sh 使用 curl 下載的檔案

實作

實作 Repo 直接 clone GitHub 的 repo：https://github.com/clarencetw/docker-volumes-example

使用無掛載 volumes 方法執行

  1. docker run --name data data
  2. docker run --rm --volumes-from data --name http-server -p 8080:8080 http-server /data
  3. 使用 curl -v http://localhost:8080/ -o /dev/null 測試有檔案
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
> GET / HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 200 OK
< accept-ranges: bytes
< cache-control: max-age=3600
< last-modified: Mon, 09 Aug 2021 14:15:45 GMT
< etag: W/"3705048-33-2021-08-09T14:15:45.052Z"
< content-length: 33
< content-type: text/html; charset=UTF-8
< Date: Mon, 09 Aug 2021 15:18:13 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
<
{ [33 bytes data]
100    33  100    33    0     0    578      0 --:--:-- --:--:-- --:--:--   578
* Connection #0 to host localhost left intact
* Closing connection 0
  1. 使用 curl -v http://localhost:8080/html/ -o /dev/null 測試有檔案
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
> GET /html/ HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 200 OK
< accept-ranges: bytes
< cache-control: max-age=3600
< last-modified: Mon, 09 Aug 2021 15:17:57 GMT
< etag: W/"3705052-137453-2021-08-09T15:17:57.448Z"
< content-length: 137453
< content-type: text/html; charset=UTF-8
< Date: Mon, 09 Aug 2021 15:19:01 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
<
{ [32453 bytes data]
100  134k  100  134k    0     0  5162k      0 --:--:-- --:--:-- --:--:-- 5162k
* Connection #0 to host localhost left intact
* Closing connection 0

使用掛載 volumes 方法執行

  1. docker run --name data -v /Users/user/data:/data data
  2. 本機 /Users/user/data/html 出現下載檔
  3. docker run --rm --volumes-from data --name http-server -p 8080:8080 http-server /data
  4. 使用 curl -v http://localhost:8080/ -o /dev/null 測試無檔案
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
> GET / HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 403 Forbidden
< accept-ranges: bytes
< Date: Mon, 09 Aug 2021 15:16:14 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
< Content-Length: 0
<
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
* Connection #0 to host localhost left intact
* Closing connection 0
  1. 使用 curl -v http://localhost:8080/html/ -o /dev/null 測試有檔案
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
> GET /html/ HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.64.1
> Accept: */*
>
< HTTP/1.1 200 OK
< accept-ranges: bytes
< cache-control: max-age=3600
< last-modified: Mon, 09 Aug 2021 15:01:56 GMT
< etag: W/"74491141-137453-2021-08-09T15:01:56.752Z"
< content-length: 137453
< content-type: text/html; charset=UTF-8
< Date: Mon, 09 Aug 2021 15:16:29 GMT
< Connection: keep-alive
< Keep-Alive: timeout=5
<
{ [14164 bytes data]
100  134k  100  134k    0     0  6391k      0 --:--:-- --:--:-- --:--:-- 6391k
* Connection #0 to host localhost left intact
* Closing connection 0
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