跑
apk update第一。以下粘贴包含一个完整的示例：
ole@T:~$ docker run -it --rm alpine /bin/ash / # apk update fetch http://dl-4.alpinelinux.org/alpine/v3.3/main/x86_64/APKINDEX.tar.gz fetch http://dl-4.alpinelinux.org/alpine/v3.3/community/x86_64/APKINDEX.tar.gz v3.3.1-97-g109077d [http://dl-4.alpinelinux.org/alpine/v3.3/main] v3.3.1-59-g48b0368 [http://dl-4.alpinelinux.org/alpine/v3.3/community] OK: 5853 distinct packages available / # apk add openssh (1/3) Installing openssh-client (7.1_p2-r0) (2/3) Installing openssh-sftp-server (7.1_p2-r0) (3/3) Installing openssh (7.1_p2-r0) Executing busybox-1.24.1-r7.trigger OK: 8 MiB in 14 packages
