HentaiAtHome Service Migration Nov 5th 2018 Words: 1.1k
This post is created 3 years ago, the content may be outdated.

For some reasons, I need to migrate my [email protected] service to a VPS on another hosting provider. After the procedure, I wrote this article for reference in the future.

Cleanup the Old One

Before begin, check whether the original host has sufficient outbound traffic quota.

First, exit [email protected] on the original host peacefully so that the Trust will not be harmed. 

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sudo systemctl stop hentaiathome

Move Data to the New Place

Now it’s time to work on configurations on the new VPS.

To connect the original host, the ssh key is needed. 

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sudo vim original-host.key
# Paste the private key, then save & exit.

Use SCP to pull all the data from the original host. 

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# Of course you should use screen for this job
screen -R
scp -r -i origianl-host.key [email protected]:/path/to/old/hath /path/to/new/hath
# Don't forget to remove the temporary key
rm original-host.key

Usually it’s better to package the data before migration, but my original host is already run out of disk space.

There’s tons of data to transfer, so now it’s BREAK TIME! 😀

Setup the New Server

Verify the migrated cache file first. The HentaiAtHome may prompt for client ID and client key on first run. Make sure the account that runs the program has the access to cache files. 

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cd /path/to/hath/
java -jar /newHentaiAtHome --verify-cache

After verification, add new user for [email protected], and also change the ownership of your new data: 

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sudo useradd -m --shell /usr/sbin/nologin hath
sudo chown -R hath:hath /path/to/hath/new

Use systemd unit file

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[Unit]
Description[email protected] service
After=local-fs.target remote-fs.target network.target

[Service]
User=hath
WorkingDirectory=/home/hath
SuccessExitStatus=143
ExecStart=/usr/bin/java -jar HentaiAtHome.jar
Restart=on-abort

[Install]
WantedBy=multi-user.target

Create an init.d script

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sudo vim /etc/init.d/hentaiathome

The content may be like: 

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#! /bin/sh

### BEGIN INIT INFO
# Provides:          hentaiathome
# Required-Start:    $local_fs $remote_fs $network
# Required-Stop:     $local_fs $remote_fs $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# X-Interactive:     true
# Short-Description: [email protected] service
# Description:       Start/stop/restart script for [email protected] service.
### END INIT INFO

# Author: Yukarin <[email protected]>

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="[email protected] service"
NAME=hentaiathome
DAEMON=/usr/bin/java
USER=hath
DIR=/home/hath/
DAEMON_ARGS="-jar /path/to/bin/HentaiAtHome.jar"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

#
# Function that starts the daemon/service
#
do_start()
{
        # Return
        #   0 if daemon has been started
        #   1 if daemon was already running
        #   2 if daemon could not be started
        start-stop-daemon --background --make-pidfile \
                --start --quiet --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \
                || return 1
        start-stop-daemon --chuid $USER --chdir $DIR --background --make-pidfile \
                --start --quiet --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_ARGS \
                || return 2
        # Add code here, if necessary, that waits for the process to be ready
        # to handle requests from services started subsequently which depend
        # on this one.  As a last resort, sleep for some time.
}

#
# Function that stops the daemon/service
#
do_stop()
{
        # Return
        #   0 if daemon has been stopped
        #   1 if daemon was already stopped
        #   2 if daemon could not be stopped
        #   other if a failure occurred
        start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --name $NAME
        RETVAL="$?"
        [ "$RETVAL" = 2 ] && return 2
        # Wait for children to finish too if this is a daemon that forks
        # and if the daemon is only ever run from this initscript.
        # If the above conditions are not satisfied then add some other code
        # that waits for the process to drop all resources that could be
        # needed by services started subsequently.  A last resort is to
        # sleep for some time.
        start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
        [ "$?" = 2 ] && return 2
        # Many daemons don't delete their pidfiles when they exit.
        rm -f $PIDFILE
        return "$RETVAL"
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
        #
        # If the daemon can reload its configuration without
        # restarting (for example, when it is sent a SIGHUP),
        # then implement that here.
        #
        start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE --name $NAME
        return 0
}

case "$1" in
  start)
        [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
        do_start
        case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
  stop)
        [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
        do_stop
        case "$?" in
                0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
                2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
        esac
        ;;
  status)
        status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
        ;;
  #reload|force-reload)
        #
        # If do_reload() is not implemented then leave this commented out
        # and leave 'force-reload' as an alias for 'restart'.
        #
        #log_daemon_msg "Reloading $DESC" "$NAME"
        #do_reload
        #log_end_msg $?
        #;;
  restart|force-reload)
        #
        # If the "reload" option is implemented then remove the
        # 'force-reload' alias
        #
        log_daemon_msg "Restarting $DESC" "$NAME"
        do_stop
        case "$?" in
          0|1)
                do_start
                case "$?" in
                        0) log_end_msg 0 ;;
                        1) log_end_msg 1 ;; # Old process is still running
                        *) log_end_msg 1 ;; # Failed to start
                esac
                ;;
          *)
                # Failed to stop
                log_end_msg 1
                ;;
        esac
        ;;
  *)
        #echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
        echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
        exit 3
        ;;
esac

:

Enable & start the service, there you go. 

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sudo systemctl enable hentaiathome
sudo systemctl start hentaiathome