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HowTo Mail Backup - Ikujam » Historique » Version 2

iku jam, 29/01/2012 20:33

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h2. Presentation
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several projects with mail servers
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request of certain stability, needed documentation
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free software user, activist and contributor
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idea is to produce a complete test environment with vms on a single machine
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CC-NC-SA
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h2. Requirements
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to follow you need some linux admin skills:
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* basic shell (bash)
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* at least basic knowledge of debian package system (install & setup packages with apt-get, manage services)
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* able to setup ssh public key authentication
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* i don't like nano, feel free to use it - or another editor - instead of vi
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h3. Host system
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* debian
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* qemu-kvm
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* bind
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This howto uses
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 # cat /etc/debian_version 
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 wheezy/sid
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 # uname -a
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 Linux master 3.1.0-1-amd64 #1 SMP Sun Dec 11 20:36:41 UTC 2011 x86_64 GNU/Linux
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h3. Mail Server VMs
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* debian
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* debian packages for the different software
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 root@mail1:~# echo "mail1" > /etc/hostname
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 root@mail1:~# apt-get install inotify-tools rsync openssh-server pgpool  javascript-common apache2 libapache2-mod-php5  roundcube postgresql postfix postfix-pgsql mailman roundcube-pgsql libc-client2007e mlock php5-imap postgrey courier-authlib-postgresql sasl2-bin courier-authdaemon  libsasl2-modules-sql courier-imap-ssl --no-install-recommends 
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* use default options for roundcube, courier & mailman  for now
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** ident authentication
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** dbconfig
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** pgsql as database choice
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** mailman language as you prefer
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* install postfixadmin :
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 root@mail1:~# lynx 'http://downloads.sourceforge.net/project/postfixadmin/postfixadmin/postfixadmin-2.3.4/postfixadmin_2.3.4_all.deb'
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* use default options for now
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* just as of personal habit, some tools i use 
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 root@mail1:~# apt-get install lynx less mc vim
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 root@mail1:~# cat /etc/debian_version 
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 wheezy/sid
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 root@mail1:~# uname -a
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 Linux mail1.test 3.1.0-1-amd64 #1 SMP Tue Jan 10 05:01:58 UTC 2012 x86_64 GNU/Linux
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 root@mail2:~# cat /etc/debian_version 
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 wheezy/sid
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 root@mail2:~# uname -a
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 Linux mail2 3.1.0-1-amd64 #1 SMP Fri Dec 23 16:37:11 UTC 2011 x86_64 GNU/Linux
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root@mail2:~# cat /etc/network/interfaces 
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# This file describes the network interfaces available on your system
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# and how to activate them. For more information, see interfaces(5).
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# The loopback network interface
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auto lo
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iface lo inet loopback
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# The primary network interface
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allow-hotplug eth0
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iface eth0 inet static
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        address 192.168.122.3
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        netmask 255.255.255.0
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        network 192.168.122.0
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        broadcast 192.168.122.255
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        gateway 192.168.122.1
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h2. dns setup on host
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root@quadebian:/etc/bind# cat  db.192.168.122
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;
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; BIND reverse data file for test
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;
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$TTL	604800
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@	IN	SOA	master.test. root.master.test. (
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			      1		; Serial
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			 604800		; Refresh
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			  86400		; Retry
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			2419200		; Expire
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			 604800 )	; Negative Cache TTL
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;
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@	IN	NS	master.test.
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1	IN	PTR	master.test.
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2	IN	PTR	mail1.test.
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3	IN	PTR	mail2.test.
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root@quadebian:/etc/bind# cat  db.test 
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;
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; BIND data file for test
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;
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$TTL	604800
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@	IN	SOA	master.test. info.master.test. (
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			      2		; Serial
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			 604800		; Refresh
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			  86400		; Retry
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			2419200		; Expire
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			 604800 )	; Negative Cache TTL
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;
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@	IN	NS	master.test.
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test.	IN	MX	10	mail1.test.
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test.	IN	MX	20	mail2.test.
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master	IN	A	192.168.122.1
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mail1	IN	A	192.168.122.2
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mail2	IN	A	192.168.122.3
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root@quadebian:/etc/bind# named-checkzone test db.test 
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zone test/IN: loaded serial 2
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OK
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* pass kvm dns server in forward mode on host node (default net config)
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root@quadebian:/etc/bind# virsh 
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Welcome to virsh, the virtualization interactive terminal.
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Type:  'help' for help with commands
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       'quit' to quit
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virsh # net-dumpxml default
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<network>
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  <name>default</name>
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  <uuid>0529cc34-c2ad-9663-0f42-5b338b14a6e4</uuid>
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  <forward mode='nat'/>
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  <bridge name='virbr0' stp='on' delay='0' />
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  <mac address='52:54:00:37:85:D8'/>
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  <ip address='192.168.122.1' netmask='255.255.255.0'>
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    <dhcp>
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      <range start='192.168.122.2' end='192.168.122.254' />
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    </dhcp>
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  </ip>
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</network>
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h3. vm dns config
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* change requires to reaffect NICs via virt-manager
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** remove nic (and /etc/udev/rules.d/70-persistent-net.rules - it keeps track of different nics on the system, avoids getting eth2/3/4...)
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** create new nic on default network
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** reboot vm
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** test connectivity & bind (set nameserver to 192.168.122.1 in /etc/resolv.conf)
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h3. tests to do
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* open http://mail1.test/roundcube & http://mail1.test/postfixadmin in a browser
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** roundcube -> 404
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** postfixadmin -> ok
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* dns
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root@quadebian:/etc/bind# dig mx test
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; <<>> DiG 9.7.3 <<>> mx test
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;; global options: +cmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26405
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;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 3
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;; QUESTION SECTION:
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;test.				IN	MX
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;; ANSWER SECTION:
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test.			604800	IN	MX	20 mail2.test.
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test.			604800	IN	MX	10 mail1.test.
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;; AUTHORITY SECTION:
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test.			604800	IN	NS	master.test.
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;; ADDITIONAL SECTION:
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mail1.test.		604800	IN	A	192.168.122.2
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mail2.test.		604800	IN	A	192.168.122.3
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master.test.		604800	IN	A	192.168.122.1
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;; Query time: 2 msec
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;; SERVER: 10.11.12.126#53(10.11.12.126)
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;; WHEN: Tue Jan 24 09:55:25 2012
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;; MSG SIZE  rcvd: 135
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h2. Server configuration
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h3. postfix 
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root@mail2:/etc/postfix# mv main.cf main.cf.debian
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root@mail2:/etc/postfix# vi  main.cf 
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root@mail2:/etc/postfix# mkdir pgsql
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root@mail2:/etc/postfix# vi pgsql/virtual_alias_maps.cf
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root@mail2:/etc/postfix# vi pgsql/virtual_domain_maps.cf
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root@mail2:/etc/postfix# vi pgsql/relay_domains.cf
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root@mail2:/etc/postfix# vi pgsql/virtual_mailbox_limits.cf
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root@mail2:/etc/postfix# vi pgsql/virtual_mailbox_maps.cf 
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root@mail2:/etc/courier# vi /etc/mailname 
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root@mail2:/etc/courier# cat /etc/postfix/transport
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lists.test mailman:
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root@mail2:/etc/courier# postmap  /etc/postfix/transport
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root@mail2:/etc/postfix# scp -r . mail1.test:/etc/postfix/
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root@mail1:/etc/postfix# vi  main.cf 
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# change following line : 
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mydestination = test,mail1.test,localhost.test, localhost
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h3. saslauthd 
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* change /etc/default/saslauthd
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 START=yes
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 MECHANISMS="rimap"
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 OPTIONS="-c -r -O localhost -m /var/run/saslauthd"
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h3. postfixadmin
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*Only on mail1* : mail2 will be synced through logshipping/PITR ;)
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* open 
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http://mail1.test/postfixadmin/setup.php
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* set password and replace specified line in /etc/postfixadmin/config.inc.php :
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 $CONF['setup_password'] = 'changeme';
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* create superadmin account using a local or valid email address (if you have internet access)
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* modify /usr/share/postfixadmin/functions.inc.php
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** this is in order to allow local domains, e.g. @.test@
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_lignes 232++_
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<pre>
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    if (!preg_match ('/^([-0-9A-Z]+\.)+' . '([0-9A-Z]){2,6}$/i', ($domain)))
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    {
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    if (!preg_match ('/^([-0-9A-Z]){3,16}$/i', ($domain)))
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        {
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        flash_error(sprintf($PALANG['pInvalidDomainRegex'], htmlentities($domain)));
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        return false;
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        }
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    }
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</pre>
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h3. courier
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root@mail1:/etc/courier# vi authdaemonrc 
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root@mail2:/etc/courier# mv authpgsqlrc authpgsqlrc.debian
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root@mail2:/etc/courier# vi authpgsqlrc
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root@mail2:/etc/courier# mv imapd imapd.debian
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root@mail2:/etc/courier# vi  imapd 
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root@mail2:/etc/courier# mv imapd-ssl imapd-ssl.debian
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root@mail2:/etc/courier# vi  imapd-ssl 
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h3. roundcube
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* activate webapp
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** uncomment two alias directives inside /etc/apache2/conf.d/roundcube
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** adapt config : 
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 $rcmail_config['default_host'] = 'localhost';
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 $rcmail_config['smtp_server'] = 'localhost';
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* /etc/init.d/apache2 reload
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h3. ssh
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* generate pair of keys on mail1 & mail2
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# su mail
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$ bash
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mail@mail2:/etc/postfix$ ssh-keygen 
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Generating public/private rsa key pair.
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Enter file in which to save the key (/var/mail/.ssh/id_rsa): 
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Created directory '/var/mail/.ssh'.
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Enter passphrase (empty for no passphrase): 
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Enter same passphrase again: 
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Your identification has been saved in /var/mail/.ssh/id_rsa.
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Your public key has been saved in /var/mail/.ssh/id_rsa.pub.
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The key fingerprint is:
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b9:bf:63:05:c0:9f:4f:07:82:d9:fd:79:99:cf:20:20 mail@mail2
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The key's randomart image is:
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+--[ RSA 2048]----+
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|       . + .     |
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|        E + o    |
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|         + + o .o|
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|         .+ o =o.|
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|        S  + o +.|
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|         .  o   o|
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|        .  .     |
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|         .o      |
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|         .oo     |
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+-----------------+
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* add mail1's public key to mail1's authorized keys 
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 mail@mail1:/$ cp /var/mail/.ssh/id_rsa.pub /var/mail/.ssh/authorized_keys
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* add mail1's public key to mail2's authorized keys 
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 mail@mail2:/$ vi /var/mail/.ssh/authorized_keys
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 mail@mail2:/$ chmod 0600 /var/mail/.ssh/authorized_keys
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* test connection
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mail@mail1:/etc/courier$ ssh mail2.test
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The authenticity of host 'mail2.test (192.168.122.3)' can't be established.
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ECDSA key fingerprint is cb:a6:dd:64:03:ba:45:61:a3:b8:14:3a:05:89:ab:b3.
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Are you sure you want to continue connecting (yes/no)? yes
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Warning: Permanently added 'mail2.test,192.168.122.3' (ECDSA) to the list of known hosts.
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Linux mail2 3.1.0-1-amd64 #1 SMP Fri Dec 23 16:37:11 UTC 2011 x86_64
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The programs included with the Debian GNU/Linux system are free software;
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the exact distribution terms for each program are described in the
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individual files in /usr/share/doc/*/copyright.
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Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
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permitted by applicable law.
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$ hostname
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mail2
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$ logout
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h3. inotify/rsync
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# gen ssh key for user @mail@ on mail1 & copy public key to mail2
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* create sync script 
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mail@mail1:/etc/courier$ vi ~/sync.sh
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<pre>
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#!/bin/sh
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BASEDIR="$1"
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REMOTE_HOST="$2"
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RSYNC_OPTIONS="-rtlavz -e ssh --delete"
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# Initial sync
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rsync ${RSYNC_OPTIONS} ${BASEDIR}/ ${REMOTE_HOST}:${BASEDIR}
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# Wait for events to trigger rsync
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inotifywait --format '%e %w' -e close_write -e move -e create -e delete -qmr $BASEDIR | while read EVENT
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do
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  # Fork off rsync proc to do sync
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rsync  ${RSYNC_OPTIONS} ${BASEDIR}/ ${REMOTE_HOST}:${BASEDIR} &
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done
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</pre>
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root@mail1:/etc/courier# mkdir /var/log/mail
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root@mail1:/etc/courier# chown mail:mail  /var/log/mail
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root@mail1:/etc/courier# vi   /etc/rc.local 
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## ajout de la ligne : 
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 su mail -l  -c " nohup sh ~/sync.sh /var/mail/ mail2.test  2>&1 >> /var/log/mail/sync.log &" 
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root@mail1:/etc/courier# sh  /etc/rc.local 
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nohup: ignoring input and redirecting stderr to stdout
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root@mail1:/etc/courier# su mail
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mail@mail1:/etc/courier$ chmod 0700 ~/sync.sh
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h3. postgresql PITR
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# gen ssh key for user @postgres@ on mail1 & copy public key to mail2
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http://www.postgresql.org/docs/8.4/static/continuous-archiving.html
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http://wiki.postgresql.org/wiki/Warm_Standby
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* stop postresql on mail2.test
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* do a full sync of the database
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# su postgres
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$ rsync -a /var/lib/postgresql/9.1/main/ postgres@mail2.test://var/lib/postgresql/9.1/main/
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on mail1 : 
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archive_command = 'rsync -a /var/lib/postgresql/9.1/main/%p postgres@mail2.test://var/lib/postgresql/9.1/wal/pg_xlog/%f'
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* restart postgresql
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on mail2 : 
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root@mail2:~# mkdir /var/lib/postgresql/9.1/wal
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root@mail2:~# chown postgres:postgres  /var/lib/postgresql/9.1/wal
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root@mail2:/var/lib/postgresql/9.1/main# vi recovery.conf
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restore_command = 'cp /var/lib/postgresql/9.1/wal/pg_xlog/%f "%p"'
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* on first startup, 
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* recovery.conf will be renamed to recovery.done after recovery
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** rename recovery.done to recovery.conf and restart postgresql to sync with latest logs from master.
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h2. putting pieces together
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* recover postfixadmin on mail1 password from  @/etc/postfixadmin/config.inc.php@ :
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 $CONF['database_password'] = 'GENERATED PASSWORD';
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* apply it to @/etc/postfixadmin/config.inc.php@ on mail2
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* apply it to the different files (mail1 & mail2):
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 for i in /etc/postfix/pgsql/virtual_alias_maps.cf /etc/postfix/pgsql/virtual_domain_maps.cf /etc/postfix/pgsql/relay_domains.cf /etc/postfix/pgsql/virtual_mailbox_limits.cf /etc/postfix/pgsql/virtual_mailbox_maps.cf ; do   sed -i "s/PASSWORD/GENERATED PASSWORD/"  $i ;  done
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 vi  /etc/courier/authpgsqlrc
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* restart courier authdaemon : 
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 /etc/init.d/courier-authdaemon restart
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* create account via postfixadmin 
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** login to http://mail1.test/postfixadmin/login.php
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** add domain (Domain list -> new domain)
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*** domain name : "test"
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** add mailbox (Virtual list -> add mailbox)
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* verify domain & mailbox creation
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* send testmail in commandline on master (apt-get install bsd-mailx)
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* verify replication of maildir on mail2
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* roundcube
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** connect on http://mail1.test/roundcube with test@test
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** send test mail to outside (may be rejected/filtered as spam since "test" emaildomain isn't valid, should work with a public MX DNS entry)
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h3. vacation/responder
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root@mail1:~# apt-get install git-core  --no-install-recommends  
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root@mail1:~# cd /usr/share/roundcube/plugins/ && git clone https://github.com/bhuisgen/rc-vacation.git vacation
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root@mail1:/usr/share/roundcube/plugins# mkdir /etc/roundcube/plugins/vacation
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root@mail1:/usr/share/roundcube/plugins# ln -s /usr/share/roundcube/plugins/vacation/config.inc.php /etc/roundcube/plugins/vacation/
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root@mail1:/usr/share/roundcube/plugins# cd vacation/
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root@mail1:/usr/share/roundcube/plugins/vacation# cp config.inc.php.dist config.inc.php
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root@mail1:/usr/share/roundcube/plugins/vacation# vi config.inc.php
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root@mail1:/usr/share/roundcube/plugins/vacation# ln -s /usr/share/roundcube/plugins/vacation/ /var/lib/roundcube/plugins/
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* edit /etc/roundcube/main.inc.php
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$rcmail_config['vacation_sql_dsn'] =
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        'pgsql://postfixadmin:PASSWORD@localhost/postfixadmin';
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* test in roundcube settings, you should have a new tab "vacation/répondeur"
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h2. failover
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* in case of a failover of mail1, mail2 should be available to receive mails and provide access to all the mails that were on mail1
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** when mail1 comes back up online, it needs to synchronize with mail2 before 
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* in case of a failover of mail2, mail1 should not be impacted
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h2. References
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http://chiliproject.tetaneutral.net/projects/tetaneutral/wiki/Serveur_Mail_tetalab
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http://www.kutukupret.com/2011/06/28/postfix-one-way-maildir-replication-backup-using-inotify-and-rsync/
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http://www.postgresql.org/docs/9.1/interactive/continuous-archiving.html