Telnet is moved to busybox-extras in Alpine image

The telnet in the Alpine image has been moved to the busybox-extras package after version 3.7 and needs to be installed separately using apk.

Phenomenon

Alpine version is 3.8, no longer has a telent pointing to busybox

~ # cat /etc/alpine-release
3.8.0
~ #
~ # ls /usr/bin/ |grep -w busybox |grep telnet
~ #

reason

Confirmed the related issue discovery, this change has already occurred in Alpine 3.7: https://github.com/gliderlabs/docker-alpine/issues/397

correspond

Use apk to install

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 #

Confirm after installation

Confirm the telnet installation path

/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

Confirm Action

When the network is connected, telnet can communicate with the SMTP server.

~ # telnet smtp.163.com 25
220 163.com Anti-spam GT for Coremail System (163com[20141201])
HELO liumiaocn
250 OK

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