Simple backup script

job.sh

#!/bin/sh
export PATH=/usr/sbin:/sbin:$PATH
export TZ=Asia/Tokyo
export LANG=en

SERVERHOST=mybackupserver.example.com
SERVERLOGIN=mybackup
SERVER="$SERVERLOGIN@$SERVERHOST"

WEEKDAY=$(date +%a)

/bin/date
nice rsync -avxH --bwlimit=10000 --rsh=/usr/bin/ssh --stats --inplace --delete --exclude=backup / "$SERVER:$WEEKDAY"
/usr/bin/ssh "$SERVER" df
/bin/date

shell.sh

#!/bin/bash

#
# rsyncによる簡易バックアップスクリプト（サーバ側）
# by Shigeru KANEMOTO
# Public Domain
#
# /etc/passwd
#   backup:x:0:0:Backup Superuser:/root/backup:/root/backup/shell
#
# authorized_keysファイルでは、以下のように指定する。
# commandオプションに、バックアップ元の名称を指定する。この名前でディレクトリが作成される。
#   command="sgk-HD160G",no-pty,no-port-forwarding ssh-rsa AAAAB3Nz...
#
# その他、sshd_configにはセキュリティ関係の設定が必要。
# PAMをやめるとか。
#

# Config
RSYNC_CMD="/usr/bin/rsync"
DF_CMD="/bin/df"
BACKUP_TOPDIR="/backup"   # バックアップ保存領域のトップ。この下にバックアップ元毎にディレクトリが作成される。

# Startup
me="$0@`hostname`"

# Check
if [ "$#" != 2 -o "$1" != "-c" ]; then
  echo "$me: set 'command=\"source-label\"' in the 'authorized_keys' file."
  exit 1
fi

src="$2"
target="$BACKUP_TOPDIR/$src"
if [ ! -d "$target" ]; then
  echo "$me: Directory '$target' does not exist."
  exit 2
fi

if [ -z "$SSH_ORIGINAL_COMMAND" ]; then
  echo "$me: set 'command=\"source label\"' in the 'authorized_keys' file."
  exit 3
fi
set $SSH_ORIGINAL_COMMAND

# Main
case "$1" in
  rsync)
    if [ "$2" = "--server" ]; then
      shift
      # オプションだけをコピーする。
      while [ "$#" -gt 0 ]; do
	if expr -- "$1" : '[^-]' > /dev/null; then
	  break
	fi
	av=(${av[*]} "$1")
	shift
      done
      shift
      dir=$(echo "$1" | sed -e 's,\.\.,,g')
      nice "$RSYNC_CMD" ${av[*]} . "$target/$dir"
      touch "$target/$dir"
    fi
    ;;

  df)
    "$DF_CMD" "$target"
    ;;

  *)
    echo "$me: $1: command not found"
    exit 4
    ;;
esac

sshd_config

# Package generated configuration file
# See the sshd(8) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
PermitRootLogin without-password  # rootはパスワードログインはできない。
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
#AuthorizedKeysFile	%h/.ssh/authorized_keys
AuthorizedKeysFile	/etc/ssh/keys/%u  # お勧め設定。バックアップ関係無しにお勧めです。

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no  # PAM関係。

# Change to no to disable tunnelled clear text passwords
PasswordAuthentication no  # パスワード認証は許可しない。

X11Forwarding no
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

Subsystem sftp /usr/lib/openssh/sftp-server

UsePAM no  # yesだとパスワード認証できてしまう。