您好, 欢迎来到 !    登录 | 注册 | | 设为首页 | 收藏本站
问答- 问题:\--no-cache Vs的Alpine Dockerfile的优势。rm / var / cache / apk / *

\--no-cache Vs的Alpine Dockerfile的优势。rm / var / cache / apk / *

\--no-cache Vs的Alpine Dockerfile的优势。rm / var / cache / apk / *

该--no-cache选项允许不在本地缓存索引，这对于保持容器较小非常有用。

从字面上看，它apk update在开头和rm -rf /var/cache/apk/*结尾相等。

我们使用--no-cacheoption的一些示例：

$ docker run -ti alpine:3.7
/ # apk add Nginx
WARNING: Ignoring APKINDEX.70c88391.tar.gz: No such file or directory
WARNING: Ignoring APKINDEX.5022a8a2.tar.gz: No such file or directory
ERROR: unsatisfiable constraints:
  Nginx (missing):
    required by: world[Nginx]
/ # 
/ # apk add --no-cache Nginx
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/community/x86_64/APKINDEX.tar.gz
(1/2) Installing pcre (8.41-r1)
(2/2) Installing Nginx (1.12.2-r3)
Executing Nginx-1.12.2-r3.pre-install
Executing busy@R_88_2419@-1.27.2-r7.trigger
OK: 6 MiB in 13 packages
/ # 
/ # ls -la /var/cache/apk/
total 8
drwxr-xr-x    2 root     root          4096 Jan  9 19:37 .
drwxr-xr-x    5 root     root          4096 Mar  5 20:29 ..

另一个不使用--no-cache选项的示例：

$ docker run -ti alpine:3.7
/ # apk add Nginx
WARNING: Ignoring APKINDEX.70c88391.tar.gz: No such file or directory
WARNING: Ignoring APKINDEX.5022a8a2.tar.gz: No such file or directory
ERROR: unsatisfiable constraints:
  Nginx (missing):
    required by: world[Nginx]
/ # 
/ # apk update
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.7/community/x86_64/APKINDEX.tar.gz
v3.7.0-107-g15dd6b8ab3 [http://dl-cdn.alpinelinux.org/alpine/v3.7/main]
v3.7.0-105-g4b8b158c40 [http://dl-cdn.alpinelinux.org/alpine/v3.7/community]
OK: 9048 distinct packages available
/ # 
/ # apk add Nginx
(1/2) Installing pcre (8.41-r1)
(2/2) Installing Nginx (1.12.2-r3)
Executing Nginx-1.12.2-r3.pre-install
Executing busy@R_88_2419@-1.27.2-r7.trigger
OK: 6 MiB in 13 packages
/ # 
/ # ls -la /var/cache/apk/
total 1204
drwxr-xr-x    2 root     root          4096 Mar  5 20:31 .
drwxr-xr-x    6 root     root          4096 Mar  5 20:31 ..
-rw-r--r--    1 root     root        451508 Mar  3 00:30 APKINDEX.5022a8a2.tar.gz
-rw-r--r--    1 root     root        768680 Mar  5 09:39 APKINDEX.70c88391.tar.gz
/ # 
/ # rm -vrf /var/cache/apk/*
removed '/var/cache/apk/APKINDEX.5022a8a2.tar.gz'
removed '/var/cache/apk/APKINDEX.70c88391.tar.gz'

如您所见，这两种情况都是有效的。对我来说，使用--no-cacheoption更为优雅。

其他 2022/1/1 18:19:20 有376人围观

撰写回答

你尚未登录，登录后可以

和开发者交流问题的细节

关注并接收问题和回答的更新提醒

参与内容的编辑和改进，让解决方法与时俱进

请先登录

推荐问题

联系我

联系我

602392714

清零编程清零编程群

置顶