“date -d”命令在Docker Alpine Linux容器上失败
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内容图文
我使用以下Dockerfile在Docker container中构建了Alpine Linux：
FROM alpine:3.2
RUN apk add --update jq curl && rm -rf /var/cache/apk/*
构建成功运行：
$docker build -t collector .
Sending build context to Docker daemon 2.048 kB
Sending build context to Docker daemon
Step 0 : FROM alpine:3.2
3.2: Pulling from alpine
8697b6cc1f48: Already exists
alpine:3.2: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
Digest: sha256:eb84cc74347e4d7c484d566dec8a5eef82bab1b78308b92cda559bcff29c27cc
Status: Downloaded newer image for alpine:3.2
---> 8697b6cc1f48
Step 1 : RUN apk add --update jq curl && rm -rf /var/cache/apk/*
---> Running in 888571296e79
fetch http://dl-4.alpinelinux.org/alpine/v3.2/main/x86_64/APKINDEX.tar.gz
(1/11) Installing run-parts (4.4-r0)
(2/11) Installing openssl (1.0.2a-r1)
(3/11) Installing lua5.2-libs (5.2.4-r0)
(4/11) Installing lua5.2 (5.2.4-r0)
(5/11) Installing ncurses-terminfo-base (5.9-r3)
(6/11) Installing ncurses-widec-libs (5.9-r3)
(7/11) Installing lua5.2-posix (33.3.1-r2)
(8/11) Installing ca-certificates (20141019-r2)
(9/11) Installing libssh2 (1.5.0-r0)
(10/11) Installing curl (7.42.1-r0)
(11/11) Installing jq (1.4-r0)
Executing busybox-1.23.2-r0.trigger
Executing ca-certificates-20141019-r2.trigger
OK: 9 MiB in 26 packages
---> 7625779b773d
Removing intermediate container 888571296e79
Successfully built 7625779b773d
无论如何,当我运行日期-d它失败：
$docker run -i -t collector sh
/ # date -d yesterday
date: invalid date 'yesterday'
/ # date -d now
date: invalid date 'now'
/ # date -d next-month
date: invalid date 'next-month'
而其余的选项似乎运行正常：
/ # date
Sat May 30 18:57:24 UTC 2015
/ # date +"%A"
Saturday
/ # date +"%Y-%m-%dT%H:%M:%SZ"
2015-05-30T19:00:38Z
解决方法:
BusyBox / Alpine版本的日期不支持-d选项,即使在Ubuntu版本以及其他更多胖发行版中的帮助是相同的.
此外,“集装箱化”也不会遗漏任何内容.
要使用-d选项,您只需添加coreutils包：
$cat Dockerfile.alpine-coreutils
FROM alpine:3.2
RUN apk add --update coreutils && rm -rf /var/cache/apk/*
$docker build -t alpine-coreutils - < Dockerfile.alpine-coreutils
Sending build context to Docker daemon 2.048 kB
Sending build context to Docker daemon
Step 0 : FROM alpine:3.2
3.2: Pulling from alpine
8697b6cc1f48: Already exists
alpine:3.2: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
Digest: sha256:eb84cc74347e4d7c484d566dec8a5eef82bab1b78308b92cda559bcff29c27cc
Status: Downloaded newer image for alpine:3.2
---> 8697b6cc1f48
Step 1 : RUN apk add --update coreutils && rm -rf /var/cache/apk/*
---> Running in 694fa5cb271c
fetch http://dl-4.alpinelinux.org/alpine/v3.2/main/x86_64/APKINDEX.tar.gz
(1/3) Installing libattr (2.4.47-r3)
(2/3) Installing libacl (2.2.52-r2)
(3/3) Installing coreutils (8.23-r0)
Executing busybox-1.23.2-r0.trigger
OK: 12 MiB in 18 packages
---> a7d9116a00ee
Removing intermediate container 694fa5cb271c
Successfully built a7d9116a00ee
$docker run -i -t alpine-coreutils sh
/ # date -d last-week
Sun May 24 09:19:34 UTC 2015
/ # date -d yesterday
Sat May 30 09:19:46 UTC 2015
/ # date
Sun May 31 09:19:50 UTC 2015
与Debian标准相比,图像大小将增加一倍,但直到11.47 MB??,大于一个大小的数量级：
$docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
alpine-coreutils latest a7d9116a00ee 2 minutes ago 11.47 MB
alpine 3.2 8697b6cc1f48 2 days ago 5.242 MB
debian latest df2a0347c9d0 11 days ago 125.2 MB
感谢Andy Shinn：http://bit.ly/1SJtz4c
和Christopher Horrell：http://bit.ly/1HDJ98T
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