RASPBIAN JESSIEでSSH接続

ちょっとはまりました。

RASPBIAN JESSIEの2016-11-25バージョンではデフォルトでSSH接続が外部からできなくなってしまいました。

外部から接続しようとするとこんな感じ

$ ssh -vvv 192.168.11.102 -l pi
OpenSSH_7.2p2, LibreSSL 2.4.1
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug2: resolving "192.168.11.102" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 192.168.11.102 [192.168.11.102] port 22.
debug1: connect to address 192.168.11.102 port 22: Connection refused
ssh: connect to host 192.168.11.102 port 22: Connection refused

どうやら仕様変更があったようです
http://downloads.raspberrypi.org/raspbian/release_notes.txt

2016-11-25:
  * SSH disabled by default; can be enabled by creating a file with name "ssh" in boot partition
  * Prompt for password change at boot when SSH enabled with default password unchanged
  * Adobe Flash Player included
  * Updates to hardware video acceleration in Chromium browser
  * Greeter now uses background image from last set in Appearance Settings rather than pi user
  * Updated version of Scratch
  * Rastrack option removed from raspi-config and Raspberry Pi Configuration
  * Ability to disable graphical boot splash screen added to raspi-config and Raspberry Pi Configuration
  * Appearance Settings dialog made tabbed to work better on small screens
  * Raspberry Pi Configuration now requires current password to change password
  * Various small bug fixes
  * Updated firmware and kernel

解決方法はブートパーテーションにsshという名のファイルを作るだけ。

$ cd /boot
$ sudo touch ssh
$ sudo reboot

セキュリティのためとはわかりますが、いきなり塞がれると困ってしまいました。

raspberrypi