Alpine镜像中的telnet在3.7版本后被转移至busybox-extras包中，需要使用apk单独安装。
现象
Alpine版本为3.8, 不再有指向busybox的telent
~ # cat /etc/alpine-release
3.8.0
~ #
~ # ls /usr/bin/ |grep -w busybox |grep telnet
~ #
原因
确认了相关的issue发现，在Alpine3.7时就已经有了这个变化：https://github.com/gliderlabs/docker-alpine/issues/397
对应
使用apk安装即可
apk update
/var/atlassian/jira # apk update
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/community/x86_64/APKINDEX.tar.gz
v3.8.0-28-g923d74cddf [http://dl-cdn.alpinelinux.org/alpine/v3.8/main]
v3.8.0-28-g923d74cddf [http://dl-cdn.alpinelinux.org/alpine/v3.8/community]
OK: 9536 distinct packages available
/var/atlassian/jira #
apk add busybox-extras
/var/atlassian/jira # apk add busybox-extras
(1/1) Installing busybox-extras (1.28.4-r1)
Executing busybox-extras-1.28.4-r1.post-install
Executing busybox-1.28.4-r0.trigger
OK: 133 MiB in 76 packages
/var/atlassian/jira #
安装后确认
确认telnet安装路径
/var/atlassian/jira # which telnet
/usr/bin/telnet
/var/atlassian/jira #
~ # ls -l /usr/bin/telnet
lrwxrwxrwx 1 root root 19 Jul 24 01:40 /usr/bin/telnet -> /bin/busybox-extras
~ # ls /bin/busybox
确认动作
在网络通的情况下，telnet可以与smtp服务器进行通信
~ # telnet smtp.163.com 25
220 163.com Anti-spam GT for Coremail System (163com[20141201])
HELO liumiaocn
250 OK
总结
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