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Revision as of 17:23, 6 October 2013

Abstract

This document describes server setup for the stoney cloud (Online) Backup service, built upon the Gentoo Linux distribution.

Overview

After working through this documentation, you will be able to set up and configure your own (Online) Backup service server.

Software Installation

Requirements

A working stoney cloud installation.

Keywords & USE-Flags

For a minimal OpenLDAP directory installation: 

echo "net-nds/openldap minimal sasl" >> /etc/portage/package.use
echo "net-nds/openldap ~amd64" >> /etc/portage/package.keywords

NSS and PAM modules for lookups using LDAP: 

echo "sys-auth/nss-pam-ldapd sasl" >> /etc/portage/package.use
echo "sys-auth/nss-pam-ldapd ~amd64" >> /etc/portage/package.keywords
echo "sys-fs/quota ldap" >> /etc/portage/package.use

echo "=app-admin/jailkit-2.16 ~amd64" >> /etc/portage/package.keywords

For the prov-backup-rsnapshot daemon: 

echo "dev-perl/Net-SMTPS ~amd64" >> /etc/portage/package.keywords
echo "perl-core/Switch ~amd64" >> /etc/portage/package.keywords

To build puttygen only without X11 (ebuild currently from our overlay, see Gentoo Bug #482816): 

echo "net-misc/putty ~amd64" >> /etc/portage/package.keywords
echo "net-misc/putty -gtk" >> /etc/portage/package.use

Emerge

emerge -va nss-pam-ldapd \
           quota \
           net-misc/putty \
           app-admin/jailkit \
           sys-apps/haveged \
           net-misc/putty \
           sys-apps/sst-backup-utils \
           sys-apps/sst-prov-backup-rsnapshot

To list the dependencies of ebuilds, you can use equery: 

equery depgraph sst-backup-utils

 * Searching for sst-backup-utils ...

 * dependency graph for sys-apps/sst-backup-utils-0.1.0
 `--  sys-apps/sst-backup-utils-0.1.0  amd64 
   `--  dev-perl/PerlUtil-0.1.0  (>=dev-perl/PerlUtil-0.1.0) amd64 
   `--  virtual/perl-Sys-Syslog-0.320.0  (virtual/perl-Sys-Syslog) amd64 
   `--  dev-perl/perl-ldap-0.530.0  (dev-perl/perl-ldap) amd64 
   `--  dev-perl/XML-Simple-2.200.0  (dev-perl/XML-Simple) amd64 
   `--  dev-perl/Config-IniFiles-2.780.0  (dev-perl/Config-IniFiles) amd64 
   `--  dev-perl/XML-Validator-Schema-1.100.0  (dev-perl/XML-Validator-Schema) amd64 
   `--  dev-perl/Date-Calc-6.300.0  (dev-perl/Date-Calc) amd64 
   `--  dev-perl/DateManip-6.310.0  (dev-perl/DateManip) amd64 
   `--  dev-perl/Schedule-Cron-Events-1.930.0  (dev-perl/Schedule-Cron-Events) amd64 
   `--  dev-perl/DateTime-Format-Strptime-1.520.0  (dev-perl/DateTime-Format-Strptime) amd64 
   `--  dev-perl/XML-SAX-0.990.0  (dev-perl/XML-SAX) amd64 
   `--  virtual/perl-MIME-Base64-3.130.0-r2  (virtual/perl-MIME-Base64) amd64 
   `--  dev-perl/Authen-SASL-2.160.0  (dev-perl/Authen-SASL) amd64 
   `--  dev-perl/Net-SMTPS-0.30.0  (dev-perl/Net-SMTPS) ~amd64 
   `--  dev-perl/text-template-1.450.0  (dev-perl/text-template) amd64 
   `--  virtual/perl-Getopt-Long-2.380.0-r2  (virtual/perl-Getopt-Long) amd64 
   `--  dev-perl/Parallel-ForkManager-1.20.0  (dev-perl/Parallel-ForkManager) amd64 
   `--  dev-perl/Time-Stopwatch-1.0.0  (dev-perl/Time-Stopwatch) amd64 
   `--  app-backup/rsnapshot-1.3.1-r1  (app-backup/rsnapshot) amd64 
[ sys-apps/sst-backup-utils-0.1.0 stats: packages (20), max depth (1) ]

For more information, visit the Gentoolkit page.

Software Configuration

OpenSSH

OpenSSH Configuration

Configure the OpenSSH daemon: 

vi /etc/ssh/sshd_config

Set following options: 

PubkeyAuthentication yes
PasswordAuthentication yes
UsePAM yes
Subsystem     sftp   internal-sftp

Make sure, that Subsystem sftp internal-sftp is the last line in the configuration file.

We want to reduce the numbers of chroot environments in one folder. As the ChrootDirectory configuration option only allows %h (home directory of the user) and %u (username of the user), we need to create the necessary matching rules in the form of: 

Match User *000
  ChrootDirectory /var/backup/000/%u
  AuthorizedKeysFile /var/backup/000/%u/%h/.ssh/authorized_keys
Match
Match User *001
  ChrootDirectory /var/backup/001/%u
  AuthorizedKeysFile /var/backup/001/%u/%h/.ssh/authorized_keys
Match
...
Match User *999
  ChrootDirectory /var/backup/999/%u
  AuthorizedKeysFile /var/backup/999/%u/%h/.ssh/authorized_keys
Match

The creation of the matching rules is done by executing the following bash commands: 

FILE=/etc/ssh/sshd_config;
 
for x in {0..999} ; do \
  printf "Match User *%03d\n" $x >> ${FILE}; \
  printf "  ChrootDirectory /var/backup/%03d/%%u\n" $x >> ${FILE}; \
  printf "  AuthorizedKeysFile /var/backup/%03d/%%u/%%h/.ssh/authorized_keys\n" $x >> ${FILE}; \
  printf "Match\n" >> ${FILE}; \
done

Don't forget to restart the OpenSSH daemon: 

/etc/init.d/sshd restart

OpenSSH Host Keys

If you migrate from a existing backup server, you might want to copy the ssh host keys to the new server. If you do so clients want see a difference between the two hosts as the fingerprint remains the same. Copy the following files from the existing host to the new:

  • /etc/ssh/ssh_host_dsa_key
  • /etc/ssh/ssh_host_ecdsa_key
  • /etc/ssh/ssh_host_key
  • /etc/ssh/ssh_host_rsa_key
  • /etc/ssh/ssh_host_dsa_key.pub
  • /etc/ssh/ssh_host_ecdsa_key.pub
  • /etc/ssh/ssh_host_key.pub
  • /etc/ssh/ssh_host_rsa_key.pub

Set the correct permissions on the new host: 

chmod 600 /etc/ssh/ssh_host_dsa_key /etc/ssh/ssh_host_ecdsa_key /etc/ssh/ssh_host_key /etc/ssh/ssh_host_rsa_key
chmod 644 /etc/ssh/*.pub

And restart the ssh daemon. Caution: do not close your existing ssh session as long as you are not sure the ssh daemon has restarted properly and you can login again. 

/etc/init.d/sshd restart

OpenLDAP

/etc/hosts

Update the /etc/hosts with the LDAP server: 

/etc/hosts

# VIP of the LDAP Server
31.216.40.4      ldapm.stoney-cloud.org

Root CA Certificate Installation

Install the root CA certificate into the OpenSSL default certificate storage directory: 

cd /etc/ssl/certs/
wget --no-check-certificate https://cloud.stepping-stone.ch/FOSS-Cloud_CA.cert.pem
chown root:root /etc/ssl/certs/FOSS-Cloud_CA.cert.pem
chmod 444 /etc/ssl/certs/FOSS-Cloud_CA.cert.pem

Rebuild the CA hashes 

c_rehash /etc/ssl/certs/

/etc/openldap/ldap.conf

Update the /etc/openldap/ldap.confLDAP configuration file/environment variables: 

/etc/openldap/ldap.conf

# Used to specify a size limit to use when performing searches. The number should be an
# non-negative integer. SIZELIMIT of zero (0) specifies unlimited search size.
SIZELIMIT       20000

# Used to specify a time limit to use when performing searches. The number should be an
# non-negative integer. TIMELIMIT of zero (0) specifies unlimited search time to be used.
TIMELIMIT       45

# Specify how aliases dereferencing is done. DEREF should be set to one of never, always, search,
# or find to specify that aliases are never dereferenced, always dereferenced, dereferenced when
# searching, or dereferenced only when locating the base object for the search. The default is to
# never dereference aliases.
DEREF           never

# Specifies the URI(s) of an LDAP server(s) to which the LDAP library should connect. The URI
# scheme may be either ldapor ldaps which refer to LDAP over TCP and LDAP over SSL (TLS)
# respectively. Each server's name can be specified as a domain- style name or an IP address
# literal. Optionally, the server's name can followed by a ':' and the port number the LDAP
# server is listening on. If no port number is provided, the default port for the scheme is
# used (389 for ldap://, 636 for ldaps://). A space separated list of URIs may be provided.
URI             ldaps://ldapm.stepping-stone.ch

# Used to specify the default base DN to use when performing ldap operations. The base must be
# specified as a Distinguished Name in LDAP format.
BASE            dc=stoney-cloud,dc=org

# This is a local copy of the certificate of the certificate authority
# used to sign the server certificate for the LDAP server I am using
TLS_CACERT      /etc/ssl/certs/FOSS-Cloud_CA.cert.pem

Check you configuration by doing a search: 

ldapsearch -v -H "ldaps://ldapm.stoney-cloud.org" \
              -b "dc=stoney-cloud,dc=org" \
              -D "cn=Manager,dc=stoney-cloud,dc=org" \
              -s one "(objectClass=*)" \
              -LLL -W

The result should look something like: 

ldap_initialize( ldaps://ldapm.stoney-cloud.org:636/??base )
filter: (objectClass=*)
requesting: All userApplication attributes
dn: ou=administration,dc=stoney-cloud,dc=org
objectClass: top
objectClass: organizationalUnit
ou: administration
...

Random Number Generator (haveged)

Tools like putty are dependent on random numbers to be able to create certificates.

haveged - Generate random numbers and feed linux random device

The haveged daemon doesn't need any special configuration, therefore you can start it from the command line interface: 

/etc/init.d/haveged start

Check, if the start was successful: 

ps auxf | grep haveged

root     18001  1.0  0.0   7420  3616 ?        Ss   08:48   0:00 /usr/sbin/haveged -r 0 -w 1024 -v 1

Add the haveged daemon to the default run level: 

rc-update add haveged default

nss-pam-ldapd

nslcd.conf — configuration file for LDAP nameservice daemon

/etc/nslcd.conf

# This is the configuration file for the LDAP nameservice
# switch library's nslcd daemon. It configures the mapping
# between NSS names (see /etc/nsswitch.conf) and LDAP
# information in the directory.
# See the manual page nslcd.conf(5) for more information.

# The user and group nslcd should run as.
uid nslcd
gid nslcd

# The uri pointing to the LDAP server to use for name lookups.
# Multiple entries may be specified. The address that is used
# here should be resolvable without using LDAP (obviously).
#uri ldap://127.0.0.1/
#uri ldaps://127.0.0.1/
#uri ldapi://%2fvar%2frun%2fldapi_sock/
# Note: %2f encodes the '/' used as directory separator
uri ldaps://ldapm.tombstone.ch

# The LDAP version to use (defaults to 3
# if supported by client library)
#ldap_version 3

# The distinguished name of the search base.
base dc=stoney-cloud,dc=org

# The distinguished name to bind to the server with.
# Optional: default is to bind anonymously.
binddn cn=Manager,dc=stoney-cloud,dc=org

# The credentials to bind with.
# Optional: default is no credentials.
# Note that if you set a bindpw you should check the permissions of this file.
bindpw myverysecretpassword

# The distinguished name to perform password modifications by root by.
#rootpwmoddn cn=admin,dc=example,dc=com

# The default search scope.
#scope sub
#scope one
#scope base

# Customize certain database lookups.
#base   group  ou=Groups,dc=example,dc=com
base   group  ou=groups,ou=backup,ou=services,dc=stoney-cloud,dc=org
base   passwd ou=accounts,ou=backup,ou=services,dc=stoney-cloud,dc=org
base   shadow ou=accounts,ou=backup,ou=services,dc=stoney-cloud,dc=org
#scope  group  onelevel
#scope  hosts  sub

#filter group  (&(objectClass=posixGroup)(sstIsActive=TRUE))
filter passwd (&(objectClass=posixAccount)(sstIsActive=TRUE))
filter shadow (&(objectClass=shadowAccount)(sstIsActive=TRUE))

# Bind/connect timelimit.
#bind_timelimit 30

# Search timelimit.
#timelimit 30

# Idle timelimit. nslcd will close connections if the
# server has not been contacted for the number of seconds.
#idle_timelimit 3600

# Use StartTLS without verifying the server certificate.
#ssl start_tls
tls_reqcert never

# CA certificates for server certificate verification
#tls_cacertdir /etc/ssl/certs
#tls_cacertfile /etc/ssl/ca.cert

# Seed the PRNG if /dev/urandom is not provided
#tls_randfile /var/run/egd-pool

# SSL cipher suite
# See man ciphers for syntax
#tls_ciphers TLSv1

# Client certificate and key
# Use these, if your server requires client authentication.
#tls_cert
#tls_key

# Mappings for Services for UNIX 3.5
#filter passwd (objectClass=User)
#map    passwd uid              msSFU30Name
#map    passwd userPassword     msSFU30Password
#map    passwd homeDirectory    msSFU30HomeDirectory
#map    passwd homeDirectory    msSFUHomeDirectory
#filter shadow (objectClass=User)
#map    shadow uid              msSFU30Name
#map    shadow userPassword     msSFU30Password
#filter group  (objectClass=Group)
#map    group  member           msSFU30PosixMember

# Mappings for Services for UNIX 2.0
#filter passwd (objectClass=User)
#map    passwd uid              msSFUName
#map    passwd userPassword     msSFUPassword
#map    passwd homeDirectory    msSFUHomeDirectory
#map    passwd gecos            msSFUName
#filter shadow (objectClass=User)
#map    shadow uid              msSFUName
#map    shadow userPassword     msSFUPassword
#map    shadow shadowLastChange pwdLastSet
#filter group  (objectClass=Group)
#map    group  member           posixMember

# Mappings for Active Directory
#pagesize 1000
#referrals off
#idle_timelimit 800
#filter passwd (&(objectClass=user)(!(objectClass=computer))(uidNumber=*)(unixHomeDirectory=*))
#map    passwd uid              sAMAccountName
#map    passwd homeDirectory    unixHomeDirectory
#map    passwd gecos            displayName
#filter shadow (&(objectClass=user)(!(objectClass=computer))(uidNumber=*)(unixHomeDirectory=*))
#map    shadow uid              sAMAccountName
#map    shadow shadowLastChange pwdLastSet
#filter group  (objectClass=group)

# Alternative mappings for Active Directory
# (replace the SIDs in the objectSid mappings with the value for your domain)
#pagesize 1000
#referrals off
#idle_timelimit 800
#filter passwd (&(objectClass=user)(objectClass=person)(!(objectClass=computer)))
#map    passwd uid           cn
#map    passwd uidNumber     objectSid:S-1-5-21-3623811015-3361044348-30300820
#map    passwd gidNumber     objectSid:S-1-5-21-3623811015-3361044348-30300820
#map    passwd homeDirectory "/home/$cn"
#map    passwd gecos         displayName
#map    passwd loginShell    "/bin/bash"
#filter group (|(objectClass=group)(objectClass=person))
#map    group gidNumber      objectSid:S-1-5-21-3623811015-3361044348-30300820

# Mappings for AIX SecureWay
#filter passwd (objectClass=aixAccount)
#map    passwd uid              userName
#map    passwd userPassword     passwordChar
#map    passwd uidNumber        uid
#map    passwd gidNumber        gid
#filter group  (objectClass=aixAccessGroup)
#map    group  cn               groupName
#map    group  gidNumber        gid

nsswitch.conf - Name Service Switch configuration file

/etc/nsswitch.conf

passwd:      files ldap
shadow:      files ldap
group:       files ldap

# passwd:    db files nis
# shadow:    db files nis
# group:     db files nis

hosts:       files dns
networks:    files dns

services:    db files
protocols:   db files
rpc:         db files
ethers:      db files
netmasks:    files
netgroup:    files
bootparams:  files

automount:   files
aliases:     files

system-auth

vi /etc/pam.d/system-auth

auth            required        pam_env.so
auth            sufficient      pam_unix.so try_first_pass likeauth nullok
auth            sufficient      pam_ldap.so minimum_uid=1000 use_first_pass
auth            required        pam_deny.so

account         required        pam_unix.so
account         sufficient      pam_ldap.so minimum_uid=1000 use_first_pass

password        required        pam_cracklib.so difok=2 minlen=8 dcredit=2 ocredit=2 retry=3
password        required        pam_unix.so try_first_pass use_authtok nullok sha512 shadow
password        sufficient      pam_ldap.so minimum_uid=1000 use_first_pass
password        required        pam_deny.so

session         required        pam_limits.so
session         required        pam_env.so
session         required        pam_unix.so
session         sufficient      pam_ldap.so minimum_uid=1000 use_first_pass

Test the Setup

nslcd -d

Update the Default Run Levels

rc-update add nslcd default
rc-update add nscd default

Start the necessary Daemons

/etc/init.d/nslcd start
/etc/init.d/nscd  start

Quota

32-bit Project Identifier Support

We need to enable 32-bit project identifier support (PROJID32BIT feature) for our naming scheme (uid numbers larger than 65'536): 

mkfs.xfs -i projid32bit=1 /dev/vdb

Update /etc/fstab and Mount

Make sure, that you have user quota (uqota) and project quota (pquota) set as options on the chosen mount point in /etc/fstab. For example: 

/dev/vdb                /var/backup     xfs             noatime,uquota,pquota   0 0

mkdir /var/backup
chmod 755 /var/backup

mount /var/backup

Check, if everything went ok: 

df -h | grep backup

/dev/vdb        1.0T   33M  1.0T   1% /var/backup

Verify

Some important options for xfs_quota:

  • -x: Enable expert mode.
  • -c: Pass arguments on the command line. Multiple arguments may be given.

Remount the file system /var/backup and check, if /var/backup has the desired values: 

xfs_quota -x -c state /var/backup

As you can see (items marked bold), we have achieved our goal: 

User quota state on /var/backup (/dev/vdb)
  Accounting: ON
  Enforcement: ON
  Inode: #131 (1 blocks, 1 extents)
Group quota state on /var/backup (/dev/vdb)
  Accounting: OFF
  Enforcement: OFF
  Inode: #132 (1 blocks, 1 extents)
Project quota state on /var/backup (/dev/vdb)
  Accounting: ON
  Enforcement: ON
  Inode: #132 (1 blocks, 1 extents)
Blocks grace time: [7 days 00:00:30]
Inodes grace time: [7 days 00:00:30]
Realtime Blocks grace time: [7 days 00:00:30]

User Quotas

Adding a User Quota

Set a quota of 1 Gigabyte for the user 4000187 (the values are in kilobytes, so 1048576 kilobyte are 1024 megabytes which corresponds to 1 gigabyte): 

xfs_quota -x -c 'limit bhard=1048576k 4000187' /var/backup

Or in bytes: 

xfs_quota -x -c 'limit bhard=1073741824 4000187' /var/backup

Read the quota information for the user 4000187: 

xfs_quota -x -c 'quota -v -N -u 4000187' /var/backup

/dev/vdb                     0          0    1048576   00 [--------] /var/backup

If the user has data in the project, that belongs to him, the result will change: 

/dev/vdb                512000          0    1048576   00 [--------] /var/backup

Modifiying a User Quota

To modify a users quota, you just set a new quota (limit): 

xfs_quota -x -c 'limit bhard=1048576k 4000187' /var/backup

Read the quota information for the user 4000187: 

xfs_quota -x -c 'quota -v -N -u 4000187' /var/backup

/dev/vdb                     0          0    1048576   00 [--------] /var/backup

If the user has data in the project, that belongs to him, the result will change: 

/dev/vdb                512000          0    1048576   00 [--------] /var/backup

Removing a User Quota

Removing a quota for a user: 

xfs_quota -x -c 'limit bhard=0 4000187' /var/backup

The following command should give you an empty result: 

xfs_quota -x -c 'quota -v -N -u 4000187' /var/backup

Project (Directory) Quotas

Adding a Project (Directory) Quota

The XFS file system additionally allows you to set quotas on individual directory hierarchies in the file system that are known as managed trees. Each managed tree is uniquely identified by a project ID and an optional project name. We'll use the following values in the examples:

  • project_ID: The uid of the online backup account (4000187).
  • project_name: The uid of the online backup account (4000187). This could be a human readable name.
  • mountpoint: The mountpoint of the xfs-filesystem (/var/backup). See the /etc/fstab entry from above.
  • directory: The directory of the project (187/4000187), starting from the mountpoint of the xfs-filesystem (/var/backup).

Define a unique project ID for the directory hierarchy in the /etc/projects file (project_ID:mountpoint/directory): 

echo "4000187:/var/backup/187/4000187/home/4000187" >> /etc/projects

Create an entry in the /etc/projid file that maps a project name to the project ID (project_name:project_ID): 

echo "4000187:4000187" >> /etc/projid

Set Project: 

xfs_quota -x -c 'project -s -p /var/backup/187/4000187/home/4000187 4000187' /var/backup

Set Quota (limit) on Project: 

xfs_quota -x -c 'limit -p bhard=1048576k 4000187' /var/backup

Check your Quota (limit) 

xfs_quota -x -c 'quota -p 4000187' /var/backup

Check the Quota:

  • -v: increase verbosity in reporting (also dumps zero values).
  • -N: suppress the initial header.
  • -p: display project quota information.
  • -h: human readable format. 
xfs_quota -x -c 'quota -v -N -p 4000187' /var/backup

/dev/vdb                     0          0    1048576   00 [--------] /var/backup

If you copied data into the project, the output will look something like: 

/dev/vdb                512000          0    1048576   00 [--------] /var/backup

To give you an overall view of the whole system: 

xfs_quota -x -c report /var/backup

User quota on /var/backup (/dev/vdb)
                               Blocks                     
User ID          Used       Soft       Hard    Warn/Grace     
---------- -------------------------------------------------- 
root          1024000          0          0     00 [--------]
4000187             0          0    1048576     00 [--------]

Project quota on /var/backup (/dev/vdb)
                               Blocks                     
Project ID       Used       Soft       Hard    Warn/Grace     
---------- -------------------------------------------------- 
4000187        512000          0    1048576     00 [--------]

Modifying a Project (Directory) Quota

To modify a project (directory) quota, you just set an new quota (limit) on the chosen project: 

xfs_quota -x -c 'limit -p bhard=1048576k 4000187' /var/backup

Check your quota (limit) 

xfs_quota -x -c 'quota -p 4000187' /var/backup

Removing a Project (Directory) Quota

Removing a quota from a project: 

xfs_quota -x -c 'limit -p bhard=0 4000187' /var/backup

Chreck the results: 

xfs_quota -x -c report /var/backup

User quota on /var/backup (/dev/vdb)
                               Blocks                     
User ID          Used       Soft       Hard    Warn/Grace     
---------- -------------------------------------------------- 
root           512000          0          0     00 [--------]
4000187             0          0       1024     00 [--------]

As you can see, the line with the Project ID 4000187 has disappeared: 

4000187        512000          0    1048576     00 [--------]

Don't forget to remove the project from /etc/projects and /etc/projid: 

sed -i -e '/4000187/d' /etc/projects
sed -i -e '/4000187/d' /etc/projid

Some important notes concerning XFS

  1. The quotacheck command has no effect on XFS filesystems. The first time quota accounting is turned on (at mount time), XFS does an automatic quotacheck internally; afterwards, the quota system will always be completely consistent until quotas are manually turned off.
  2. There is no need for quota file(s) in the root of the XFS filesystem.

prov-backup-rsnapshot

cd /var/work
git clone --recursive https://github.com/stepping-stone/prov-backup-rsnapshot.git
cd /var/work/prov-backup-rsnapshot/Provisioning/etc/Provisioning/
ln -s ../../../etc/Provisioning/Backup/ Backup
cd /var/work/prov-backup-rsnapshot/Provisioning/lib/Provisioning/
ln -s ../../../lib/Provisioning/Backup/ Backup
chmod -R a+rX /var/work

Configuration

The configuration file is currently located in the /var/work/prov-backup-rsnapshot directory: 

vi /var/work/prov-backup-rsnapshot/etc/Provisioning/Backup/Rsnapshot_test.conf

# Copyright (C) 2013 stepping stone GmbH
#                    Switzerland
#                    http://www.stepping-stone.ch
#                    support@stepping-stone.ch
#
# Authors:
#  Pat Kläy <pat.klaey@stepping-stone.ch>
#  
# Licensed under the EUPL, Version 1.1.
#
# You may not use this work except in compliance with the
# Licence.
# You may obtain a copy of the Licence at:
#
# http://www.osor.eu/eupl
#
# Unless required by applicable law or agreed to in
# writing, software distributed under the Licence is
# distributed on an "AS IS" basis,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied.
# See the Licence for the specific language governing
# permissions and limitations under the Licence.
#


[Global]
# If true the script logs every information to the log-file.
LOG_DEBUG = 1

# If true the script logs additional information to the log-file.
LOG_INFO = 1

#If true the script logs warnings to the log-file.
LOG_WARNING = 1

#If true the script logs errors to the log-file.
LOG_ERR = 1

ENVIRONMENT = 
 
[Database]
BACKEND = LDAP
SERVER = ldaps://ldapm.tombstone.ch
PORT = 636
ADMIN_USER = cn=Manager,dc=stoney-cloud,dc=org
ADMIN_PASSWORD = <PASSWORD>
SERVICE_SUBTREE = ou=accounts,ou=backup,ou=services,dc=stoney-cloud,dc=org
COOKIE_FILE = /var/work/prov-backup-rsnapshot/Provisioning/etc/Provisioning/Backup/rnsapshot.cookie
DEFAULT_COOKIE = rid=001,csn=
SEARCH_FILTER = (&(entryCSN>=%entryCSN%)(objectClass=*))

[Service]
MODUS = selfcare
TRANSPORTAPI = LocalCLI
SERVICE = Backup
TYPE = Rsnapshot

SYSLOG = Backup-Rsnapshot

[Gateway]
HOST = localhost
USER = provisioning
DSA_FILE = none

[Backup]
RSNAPSHOT_CONFIG_FILE = /etc/rsnapshot/rsnapshot.conf.%uid%
SET_QUOTA_CMD = /usr/sbin/setquota
CREATE_CHROOT_CMD = /root/createDummyBackupDirectory.sh # You might want to change this for the productive system
MOUNTPOINT = / # You might want to change this for the productive system

Init Scripts

Currently we just create very basic init scripts which start and stop the deamon: 

/etc/init.d/prov-backup-rsnapshot

#!/sbin/runscript
# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

depend() {
    need net
    after slapd
}

start() {
    ebegin "Starting backup-rsnapshot provisioning daemon"
    start-stop-daemon --start \
        --background \
        --user ${USER:-root}:${GROUP:-root} \
        --make-pidfile \
        --pidfile "${PIDFILE}" \
        --exec /var/work/prov-backup-rsnapshot/Provisioning/bin/provisioning.pl \
        --interpreted \
        -- ${OPTIONS} \
            -c /var/work/prov-backup-rsnapshot/Provisioning/etc/Provisioning/Backup/Rsnapshot_test.conf \
            -g /var/work/prov-backup-rsnapshot/Provisioning/etc/Provisioning/Global.conf
    eend $?
}

stop() {
    ebegin "Stopping backup-rsnapshot provisioning daemon"
    start-stop-daemon --stop \
        --pidfile "${PIDFILE}"
    eend $?
}

/etc/conf.d/prov-backup-rsnapshot

USER="root"
GROUP="root"

PIDFILE="/run/prov-backup-rsnapshot.pid"

# OPTIONS="..."

Run-Level

rc-update add prov-backup-rsnapshot default

Write Backup Account Size

If you have already installed the rsnapshot script, you also have the writeAccountSize script. Otherwise follow these instructions (installation only)

Write Backup Account Size Configuration

/etc/backup-utils/writeAccountSize.conf

[Global]
INCOMING_DIRECTORY = /incoming
ACCOUNT_SIZE_FILE = /etc/backupSize
SNAPSHOTS = 1

[Syslog]
SYSLOG = rsnapshot

[Directory]
LDAP_SERVER = ldaps://ldapm.tombstone.ch
LDAP_PORT = 636
LDAP_BIND_DN = cn=Manager,dc=stoney-cloud,dc=org
LDAP_BIND_PW = <password>
LDAP_BASE_DN = ou=accounts,ou=backup,ou=services,dc=stoney-cloud,dc=org
LDAP_PERSON_BASE = ou=people,dc=stoney-cloud,dc=org
LDAP_RESELLER_BASE = ou=reseller,ou=configuration,ou=backup,ou=services,dc=stoney-cloud,dc=org
LDAP_EMAIL_ATTRIBUTE = mail

[Notification]
EMAIL_SENDER = stepping stone GmbH Supprt <support@stepping-stone.ch>
EMAIL_ALERT_THRESHOLD = 85

Salutation_Default_de-CH = Liebe Kundin / Lieber Kunde
Salutation_m_de-CH = Sehr geehrter Herr
Salutation_f_de-CH = Sehr geehrte Frau
Salutation_Default_en-GB = Dear customer
Salutation_m_en-GB = Dear Mr.
Salutation_f_en-GB = Dear Mrs.

[MAIL]
host = mail.stepping-stone.ch
port = 587
username = support@stepping-stone.ch
password = <password>

Write Backup Account Size Test

/usr/libexec/backup-utils/writeAccountSize.pl -U 4000080 -d

Debug modus was turned on

Debug sub checkUsersHomeDirectory: $localUsersHomeDirectory: /var/backup/080/4000080/home/4000080
Debug sub checkUsersHomeDirectory: The $localUsersHomeDirectory /var/backup/080/4000080/home/4000080 exists

Debug sub checkUsersIncomingDirectory: $localUsersHomeDirectory:   /var/backup/080/4000080/home/4000080
Debug sub checkUsersIncomingDirectory: $localUsersIncomingDirectory: /incoming
Debug sub checkUsersIncomingDirectory: $localIncomingPath:           /var/backup/080/4000080/home/4000080/incoming

Debug sub checkUsersIncomingDirectory: The $localIncomingPath /var/backup/080/4000080/home/4000080/incoming exists
Total Quota: 1048576 kilobytes
Total used Space: 0 kilobytes
Incoming Size: 0 kilobytes
Debug sub getSnapshotsSize: $localUsedQuota:   0
Debug sub getSnapshotsSize: $localSnapshotsSize:   0
Debug writeAccountSize: Working on /var/backup/080/4000080/etc/backupSize
Debug: wrote 1024 0 0 to /var/backup/080/4000080/etc/backupSize
DEBUG:  Successfully executed the following modifications for entry uid=4000080,ou=accounts,ou=backup,ou=services,o=stepping-stone,c=ch: sstBackupSize => 0

DEBUG:  Successfully executed the following modifications for entry uid=4000080,ou=accounts,ou=backup,ou=services,o=stepping-stone,c=ch: sstIncrementSize => 0

Alert Threshold: 85 %
Calculated value: 0

Now write some data (200 megaytes in this example) into the users incoming directory and then execute the script again: 

dd if=/dev/zero of=/var/backup/080/4000080/home/4000080/incoming/test.zeros bs=1024k count=200
chown 4000080:4000080 /var/backup/080/4000080/home/4000080/incoming/test.zeros
/usr/libexec/backup-utils/writeAccountSize.pl -U 4000080 -d

Debug modus was turned on

Debug sub checkUsersHomeDirectory: $localUsersHomeDirectory: /var/backup/080/4000080/home/4000080
Debug sub checkUsersHomeDirectory: The $localUsersHomeDirectory /var/backup/080/4000080/home/4000080 exists

Debug sub checkUsersIncomingDirectory: $localUsersHomeDirectory:   /var/backup/080/4000080/home/4000080
Debug sub checkUsersIncomingDirectory: $localUsersIncomingDirectory: /incoming
Debug sub checkUsersIncomingDirectory: $localIncomingPath:           /var/backup/080/4000080/home/4000080/incoming

Debug sub checkUsersIncomingDirectory: The $localIncomingPath /var/backup/080/4000080/home/4000080/incoming exists
Total Quota: 1048576 kilobytes
Total used Space: 204800 kilobytes
Incoming Size: 204800 kilobytes
Debug sub getSnapshotsSize: $localUsedQuota:   204800
Debug sub getSnapshotsSize: $localSnapshotsSize:   0
Debug writeAccountSize: Working on /var/backup/080/4000080/etc/backupSize
Debug: wrote 1024 200 0 to /var/backup/080/4000080/etc/backupSize
DEBUG:  Successfully executed the following modifications for entry uid=4000080,ou=accounts,ou=backup,ou=services,o=stepping-stone,c=ch: sstBackupSize => 209715200

DEBUG:  Successfully executed the following modifications for entry uid=4000080,ou=accounts,ou=backup,ou=services,o=stepping-stone,c=ch: sstIncrementSize => 0

Alert Threshold: 85 %
Calculated value: 19.53125

Everything seems to be working fine!

Snapshots

We use rsnapshot - remote filesystem snapshot utility for the actual snapshots and a handful of wrapper scripts, that do things like:

  • Read the users and their settings from the LDAP directory.
  • Execute rsnapshot according to the users settings.
  • Write the backup quotas backup (incoming), iterations (.snapshots) and free space to the users local backupSize file and update the LDAP directory.
  • Inform the reseller, customer or user (depending on the settings in the LDAP directory) via mail, if the quota limit has been reached.
  • Depending on the users settings in the LDAP directory, warning mail will be sent to the reseller, customer or user, if a backup was not executed on time.

rsnaphot configuration directory

The users individual rsnapshot configurations are stored under /etc/rsnapshot. Please make sure, that the directory exists: 

ls -al /etc | grep rsnapshot

drwx------  2 root   root      64 30. Aug 20:20 rsnapshot

If not, create it: 

mkdir /etc/rsnapshot
chmod 700 /etc/rsnapshot

snapshot.pl Configuration

The snapshot.pl script is responsible for the execution of rsnapshot according to the users settings. 

/etc/backup-utils/snapshot.conf 

[General]
MaxParallelProcesses = 5
Rsnapshot_command = /usr/bin/nice -n 19 /usr/bin/rsnapshot  -c /etc/rsnapshot/rsnapshot.conf.%uid% %interval%

[LDAP]
Host = ldaps://ldapm.tombstone.ch
Port = 636
User = cn=Manager,dc=stoney-cloud,dc=org
Password = <Password>
CA_Path = /etc/ssl/certs
Accounts_Base = ou=accounts,ou=backup,ou=services,dc=stoney-cloud,dc=org

Legend:

  • %uid%: The backup account and login uid as a numeric number. For example: 4000205.
  • %interval%: The backup level to be executed. Possible values are hourly, daily, weekly, monthly and yearly.

snapshot.pl Test

Before adding the necessary cronjob entries, we need to make sure, that we've configured the snapshot.pl script correctly: 

/usr/libexec/backup-utils/snapshot.pl --interval daily -d

If everything worked as planned, you should receive feedback looking roughly like: 

INFO:  Starting rsnapshot for interval daily with maximum 5 parallel processes

INFO:  Executing snapshot for 4000080

INFO:  Executing snapshot for 4000079

INFO:  Snapshot process for 4000079 finished in 0.18 seconds with status 0

INFO:  Snapshot process for 4000080 finished in 0.19 seconds with status 0

INFO:  rsnapshot for all backups done. Took 0.24 seconds

Just to make sure, that everything did work out fine, execute writeAccountSize.pl againg: 

/usr/libexec/backup-utils/writeAccountSize.pl -U 4000080 -d

Debug modus was turned on

Debug sub checkUsersHomeDirectory: $localUsersHomeDirectory: /var/backup/080/4000080/home/4000080
Debug sub checkUsersHomeDirectory: The $localUsersHomeDirectory /var/backup/080/4000080/home/4000080 exists

Debug sub checkUsersIncomingDirectory: $localUsersHomeDirectory:   /var/backup/080/4000080/home/4000080
Debug sub checkUsersIncomingDirectory: $localUsersIncomingDirectory: /incoming
Debug sub checkUsersIncomingDirectory: $localIncomingPath:           /var/backup/080/4000080/home/4000080/incoming

Debug sub checkUsersIncomingDirectory: The $localIncomingPath /var/backup/080/4000080/home/4000080/incoming exists
Total Quota: 1048576 kilobytes
Total used Space: 409600 kilobytes
Incoming Size: 204800 kilobytes
Debug sub getSnapshotsSize: $localUsedQuota:   409600
Debug sub getSnapshotsSize: $localSnapshotsSize:   204800
Debug writeAccountSize: Working on /var/backup/080/4000080/etc/backupSize
Debug: wrote 1024 200 200 to /var/backup/080/4000080/etc/backupSize
DEBUG:  Successfully executed the following modifications for entry uid=4000080,ou=accounts,ou=backup,ou=services,o=stepping-stone,c=ch: sstBackupSize => 209715200

DEBUG:  Successfully executed the following modifications for entry uid=4000080,ou=accounts,ou=backup,ou=services,o=stepping-stone,c=ch: sstIncrementSize => 209715200

Alert Threshold: 85 %
Calculated value: 39.0625

As you can see, the total used space has risen to 39.0625.

Cronjobs

After making sure, that everything worked as planned, you can update your crontab entry: 

crontab -e

...
# Rsnapshot for all users
30 22 * * * /usr/libexec/backup-utils/snapshot.pl --interval daily
15 22 * * sun /usr/libexec/backup-utils/snapshot.pl --interval weekly
00 22 1 * * /usr/libexec/backup-utils/snapshot.pl --interval monthly
...

schedule warning

To install the new schedule warning script you have to execute the following commands: 

cd /var/work/
git clone --recursive https://github.com/stepping-stone/backup-surveillance.git
cd backup-surveillance/bin/
ln -s ../perl-utils/lib/PerlUtil/ PerlUtil

Configuration

vi /var/work/backup-surveillance/etc/config.conf

[XML]
SCHEDULE_FILE = %homeDirectory%/incoming/%computerName%/.sepiola_backup/scheduler.xml
SCHEDULE_XSD = %configpath%/../etc/schema/scheduler_schema.xsd
BACKUP_ENDED_FILE = %homeDirectory%/incoming/%computerName%/.sepiola_backup/backupEnded.xml
BACKUP_ENDED_XSD =  %configpath%/../etc/schema/backupended_schema.xsd
BACKUP_STARTED_FILE = %homeDirectory%/incoming/%computerName%/.sepiola_backup/backupStarted.xml
BACKUP_STARTED_XSD =   %configpath%/../etc/schema/backupstarted_schema.xsd


[TEMPLATE]
Salutation_Default_de-CH = Liebe Kundin / Lieber Kunde
Salutation_m_de-CH = Sehr geehrter Herr
Salutation_f_de-CH = Sehr geehrte Frau
Salutation_Default_en-GB = Dear customer
Salutation_m_en-GB = Dear Mr.
Salutation_f_en-GB = Dear Mrs.

[LDAP]

SERVER = ldaps://ldapm.tombstone.ch
PORT = 636
DEBUG = 1

ADMIN_DN = cn=Manager,dc=foss-cloud,dc=org 
ADMIN_PASSWORD = <Password>

BACKUP_BASE = ou=accounts,ou=backup,ou=services,dc=foss-cloud,dc=org
PEOPLE_BASE = ou=people,dc=foss-cloud,dc=org
RESELLER_BASE = ou=reseller,ou=configuration,ou=backup,ou=services,dc=foss-cloud,dc=org
SCOPE = sub

[MAIL]
mailTo = 
host = mail.stepping-stone.ch
port = 587
username = 
password = 
from =

Links

  • OpenLDAP, an open source implementation of the Lightweight Directory Access Protocol.
  • nss-pam-ldapd, a Name Service Switch (NSS) module that allows your LDAP server to provide user account, group, host name, alias, netgroup, and basically any other information that you would normally get from /etc flat files or NIS.
  • Gentoo Leitfaden zur OpenLDAP Authentifikation.
  • Centralized authentication using OpenLDAP.
  • openssh-lpk_openldap.schema OpenSSH LDAP Public Keys.
  • linuxquota Linux DiskQuota.
  • rsnapshot, a remote filesystem snapshot utility, based on rsync.
  • Jailkit, set of utilities to limit user accounts to specific files using chroot() and or specific commands. Also includes a tool to build a chroot environment.
  • Busybox BusyBox combines tiny versions of many common UNIX utilities into a single small executable. Useful to reduce the number of files (and thus the complexity) when building a chroot.
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