CentOS (Raspberry Pi)でVNCを使う

# yum install tigervnc-server

# cd /lib/systemd/system
# cp vncserver@.service vncserver@:2.service

# vi vncserver@:2.service
# The vncserver service unit file
#
# Quick HowTo:
# 1. Copy this file to /etc/systemd/system/vncserver@.service
# 2. Replace <USER> with the actual user name and edit vncserver
#    parameters in the wrapper script located in /usr/bin/vncserver_wrapper
# 3. Run `systemctl daemon-reload`
# 4. Run `systemctl enable vncserver@:<display>.service`
#
# DO NOT RUN THIS SERVICE if your local area network is
# untrusted!  For a secure way of using VNC, you should
# limit connections to the local host and then tunnel from
# the machine you want to view VNC on (host A) to the machine
# whose VNC output you want to view (host B)
#
# [user@hostA ~]$ ssh -v -C -L 590N:localhost:590M hostB
#
# this will open a connection on port 590N of your hostA to hostB's port 590M
# (in fact, it ssh-connects to hostB and then connects to localhost (on hostB).
# See the ssh man page for details on port forwarding)
#
# You can then point a VNC client on hostA at vncdisplay N of localhost and with
# the help of ssh, you end up seeing what hostB makes available on port 590M
#
# Use "-nolisten tcp" to prevent X connections to your VNC server via TCP.
#
# Use "-localhost" to prevent remote VNC clients connecting except when
# doing so through a secure tunnel.  See the "-via" option in the
# `man vncviewer' manual page.
[Unit]
Description=Remote desktop service (VNC)
After=syslog.target network.target
[Service]
Type=simple
# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/usr/bin/vncserver_wrapper <USER> %i
ExecStop=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
[Install]
WantedBy=multi-user.target
/* 上記の <USER> をVNCサーバを立てるユーザ名に変更 */

# firewall-cmd --add-service=vnc-server --permanent
# firewall-cmd --reload

# su ユーザ名
# vncpasswd
Password:
Verify:
Would you like to enter a view-only password (y/n)? n
/* 最後の質問は表示専用のパスワードが必要か聞かれるので n 応答 */

# systemctl start vncserver@:2
/* 初回だけかもしれませんが以下のような入力を求められたら設定したパスワードを入力 */
==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
Authentication is required to manage system services or units.
Authenticating as: Sirius (sirius)
Password: 
==== AUTHENTICATION COMPLETE ===

# systemctl status vncserver@:2

# systemctl enable vncserver@:2