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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Build an iRedMail fail-over Cluster with KeepAlived, HAProxy, GlusterFS, OpenLDAP, Mariadb</title>
<link rel="stylesheet" type="text/css" href="./css/markdown.css" />
</head>
<body>
<div id="navigation">
<a href="https://www.iredmail.org" target="_blank">
<img alt="iRedMail web site"
src="./images/logo-iredmail.png"
style="vertical-align: middle; height: 30px;"
/>&nbsp;
<span>iRedMail</span>
</a>
&nbsp;&nbsp;//&nbsp;&nbsp;<a href="./index.html">Document Index</a></div><h1 id="build-an-iredmail-fail-over-cluster-with-keepalived-haproxy-glusterfs-openldap-mariadb">Build an iRedMail fail-over Cluster with KeepAlived, HAProxy, GlusterFS, OpenLDAP, Mariadb</h1>
<div class="toc">
<ul>
<li><a href="#build-an-iredmail-fail-over-cluster-with-keepalived-haproxy-glusterfs-openldap-mariadb">Build an iRedMail fail-over Cluster with KeepAlived, HAProxy, GlusterFS, OpenLDAP, Mariadb</a><ul>
<li><a href="#todo">TODO</a></li>
<li><a href="#goal">Goal</a></li>
<li><a href="#requirements">Requirements</a></li>
<li><a href="#summary">Summary</a></li>
<li><a href="#install-and-configure-keepalived">Install and configure KeepAlived</a></li>
<li><a href="#install-and-configure-haproxy">Install and configure HAProxy</a></li>
<li><a href="#glusterfs">GlusterFS</a><ul>
<li><a href="#add-new-hard-disk-and-format-with-preferred-file-system">Add new hard disk and format with preferred file system</a></li>
<li><a href="#install-and-configure-gulsterfs">Install and Configure GulsterFS</a></li>
</ul>
</li>
<li><a href="#install-and-configure-iredmail">Install and configure iRedMail</a></li>
<li><a href="#configure-ldap-replication-master-slave">Configure LDAP replication (Master-Slave)</a></li>
<li><a href="#configure-mariadb-replication-master-master">Configure MariaDB replication (Master-Master)</a><ul>
<li><a href="#create-replicator-dbuser-on-both-servers">create replicator dbuser on both servers</a></li>
</ul>
</li>
<li><a href="#testing">Testing</a></li>
</ul>
</li>
</ul>
</div>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>This tutorial was contributed by Setyo Prayitno <code>&lt;jrsetyo _at_ gmail.com&gt;</code>
(forum user name <code>t10</code>) <a href="https://forum.iredmail.org/topic10773.html">on March 13, 2016</a>.
Thanks Setyo. :) iRedMail Team doesn't offer tech support for this setup.</p>
</div>
<h2 id="todo">TODO</h2>
<ul>
<li>Use clear server hostnames and IP addresses for all involved servers.</li>
<li>Install adminer from <a href="http://adminer.org">http://adminer.org</a></li>
</ul>
<h2 id="goal">Goal</h2>
<p>Build a fail-over cluster with 4 servers (2 backend servers behind HAProxy + KeepAlived).</p>
<h2 id="requirements">Requirements</h2>
<ul>
<li>A valid mail domain name. We use <code>example.com</code> as mail domain name in this document.</li>
<li>
<p>4 servers, all are CentOS 7.</p>
<ul>
<li>2 servers run HAProxy + KeepAlived as a frontend for load-balance
(HAProxy) and fail-over (KeepAlived).</li>
<li>2 servers run the actual mail services. We will install the latest
iRedMail release for this.</li>
</ul>
</li>
</ul>
<p>The big picture:</p>
<p><img alt="" src="./images/cluster/contrib/iredmailhat10.png" /></p>
<h2 id="summary">Summary</h2>
<p>Hostnames and IP addresses:</p>
<ul>
<li>
<p>We use hostname <code>ha1.example.com</code> and <code>ha2.example.com</code> for our 2 servers
which runs HAProxy and KeepAlived, use <code>ha1</code> and <code>ha2</code> for short.</p>
</li>
<li>
<p>We use hostname <code>mail1.example.com</code> and <code>mail2.example.com</code> for our 2 servers
which runs iRedMail for mail services, use <code>mail1</code> and <code>mail2</code> for short.</p>
</li>
<li>
<p>IP addresses:</p>
</li>
</ul>
<pre><code>192.168.1.1 ha1
192.168.1.2 ha2
192.168.1.3 mail1
192.168.1.4 mail2
</code></pre>
<p>The procedure:</p>
<ol>
<li>Install and configure KeepAlived</li>
<li>Install and configure HAProxy</li>
<li>Install and configure GlusterFS as glusterserver &amp; glusterclient (you can
use separate machine for glusterserver) it's better to use a new hard drive
with the same capacity</li>
<li>Install and configure iRedMail</li>
<li>Setup OpenLDAP replication (Master-Slave)</li>
<li>Setup MariaDB replication (Master-Master)</li>
</ol>
<h2 id="install-and-configure-keepalived">Install and configure KeepAlived</h2>
<p>Install on 2 servers (ha1 &amp; ha2)</p>
<ul>
<li>on both servers, update <code>/etc/hosts</code>:</li>
</ul>
<pre><code>192.168.1.1 ha1
192.168.1.2 ha2
192.168.1.3 mail1
192.168.1.4 mail2
</code></pre>
<ul>
<li>Install KeepAlived and backup default config file:</li>
</ul>
<pre><code>yum install -y keepalived
mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_DEFAULT
</code></pre>
<ul>
<li>on ha1:</li>
</ul>
<pre><code>nano /etc/keepalived/keepalived.conf
</code></pre>
<ul>
<li>change eth0 to your existing interface</li>
</ul>
<pre><code>vrrp_script chk_haproxy {
script &quot;killall -0 haproxy&quot; # check the haproxy process
interval 2 # every 2 seconds
weight 2 # add 2 points if OK
}
vrrp_instance VI_1 {
interface eth0 # interface to monitor
state MASTER # MASTER on ha1, BACKUP on ha2
virtual_router_id 51
priority 101 # 101 on ha1, 100 on ha2
virtual_ipaddress {
192.168.1.10 # virtual ip address
}
track_script {
chk_haproxy
}
}
</code></pre>
<ul>
<li>on ha2, update <code>/etc/keepalived/keepalived.conf</code></li>
</ul>
<p>change <code>eth0</code> to your existing interface</p>
<pre><code>vrrp_script chk_haproxy {
script &quot;killall -0 haproxy&quot; # check the haproxy process
interval 2 # every 2 seconds
weight 2 # add 2 points if OK
}
vrrp_instance VI_1 {
interface eth0 # interface to monitor
state BACKUP # MASTER on ha1, BACKUP on ha2
virtual_router_id 51
priority 101 # 101 on ha1, 100 on ha2
virtual_ipaddress {
192.168.1.10 # virtual ip address
}
track_script {
chk_haproxy
}
}
</code></pre>
<ul>
<li>activate KeepAlived service on both servers:</li>
</ul>
<pre><code>systemctl enable keepalived
systemctl start keepalived
</code></pre>
<ul>
<li>Check status of virtual IP (192.168.1.10) with command below:</li>
</ul>
<pre><code>ip a
</code></pre>
<h2 id="install-and-configure-haproxy">Install and configure HAProxy</h2>
<ul>
<li>Install on both servers (ha1 &amp; ha2)</li>
</ul>
<pre><code>yum install -y haproxy
mv /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg_DEFAULT
</code></pre>
<ul>
<li>on ha1: update <code>/etc/haproxy/haproxy.cfg</code></li>
</ul>
<pre><code>global
log 127.0.0.1 local0
log 127.0.0.1 local1 debug
maxconn 45000 # Total Max Connections.
daemon
nbproc 1 # Number of processing cores.
defaults
timeout server 86400000
timeout connect 86400000
timeout client 86400000
timeout queue 1000s
# [HTTP Site Configuration]
listen http_web 192.168.1.10:80
bind *:80
bind *:443 ssl crt /etc/ssl/iredmail.org/iredmail.org.pem
redirect scheme https if !{ ssl_fc }
mode http
balance roundrobin # Load Balancing algorithm
option httpchk
option forwardfor
server mail1 192.168.1.3:443 weight 1 maxconn 512 check
server mail2 192.168.1.4:443 weight 1 maxconn 512 check
# [HTTPS Site Configuration]
listen https_web 192.168.1.10:443
mode tcp
balance source# Load Balancing algorithm
reqadd X-Forwarded-Proto:\ http
server mail1 192.168.1.3:443 weight 1 maxconn 512 check
server mail2 192.168.1.4:443 weight 1 maxconn 512 check
# Reporting
listen stats
bind :9000
mode http
# Enable statistics
stats enable
# Hide HAPRoxy version, a necessity for any public-facing site
stats hide-version
# Show text in authentication popup
stats realm Authorization
# URI of the stats page: localhost:9000/haproxy_stats
stats uri /haproxy_stats
# Set a username and password
stats auth yourUsername:yourPassword
</code></pre>
<ul>
<li>on ha2, update <code>/etc/haproxy/haproxy.cfg</code></li>
</ul>
<pre><code>global
log 127.0.0.1 local0
log 127.0.0.1 local1 debug
maxconn 45000 # Total Max Connections.
daemon
nbproc 1 # Number of processing cores.
defaults
timeout server 86400000
timeout connect 86400000
timeout client 86400000
timeout queue 1000s
# [HTTP Site Configuration]
listen http_web 192.168.1.10:80
bind *:80
bind *:443 ssl crt /etc/ssl/iredmail.org/iredmail.org.pem
redirect scheme https if !{ ssl_fc }
mode http
balance roundrobin # Load Balancing algorithm
option httpchk
option forwardfor
server mail1 192.168.1.3:80 weight 1 maxconn 512 check
server mail2 192.168.1.4:80 weight 1 maxconn 512 check
# [HTTPS Site Configuration]
listen https_web 192.168.1.10:443
mode tcp
balance source# Load Balancing algorithm
reqadd X-Forwarded-Proto:\ http
server mail1 192.168.1.3:443 weight 1 maxconn 512 check
server mail2 192.168.1.4:443 weight 1 maxconn 512 check
# Reporting
listen stats
bind :9000
mode http
# Enable statistics
stats enable
# Hide HAPRoxy version, a necessity for any public-facing site
stats hide-version
# Show text in authentication popup
stats realm Authorization
# URI of the stats page: localhost:9000/haproxy_stats
stats uri /haproxy_stats
# Set a username and password
stats auth yourUsername:yourPassword
</code></pre>
<ul>
<li>on both servers:</li>
</ul>
<p>create cert for ssl redirect (to iRedMail Servers)</p>
<pre><code>mkdir /etc/ssl/iredmail.org/
openssl genrsa -out /etc/ssl/iredmail.org/iredmail.org.key 2048
openssl req -new -key /etc/ssl/iredmail.org/iredmail.org.key -out /etc/ssl/iredmail.org/iredmail.org.csr
openssl x509 -req -days 365 -in /etc/ssl/iredmail.org/iredmail.org.csr -signkey /etc/ssl/iredmail.org/iredmail.org.key -out /etc/ssl/iredmail.org/iredmail.org.crt
cat /etc/ssl/iredmail.org/iredmail.org.crt /etc/ssl/iredmail.org/iredmail.org.key &gt; /etc/ssl/iredmail.org/iredmail.org.pem
</code></pre>
<p>activate HAProxy service</p>
<pre><code>systemctl enable haproxy
systemctl start haproxy
</code></pre>
<p>check log if any errors</p>
<pre><code>tail -f /var/log/messages
</code></pre>
<p>allow http, https, haproxystat ports</p>
<pre><code>firewall-cmd --zone=public --permanent --add-port=80/tcp
firewall-cmd --zone=public --permanent --add-port=443/tcp
firewall-cmd --zone=public --permanent --add-port=9000/tcp
firewall-cmd --complete-reload
</code></pre>
<h2 id="glusterfs">GlusterFS</h2>
<h3 id="add-new-hard-disk-and-format-with-preferred-file-system">Add new hard disk and format with preferred file system</h3>
<p>first, add new hard drive with the same capacity</p>
<ul>
<li>on both servers, update <code>/etc/hosts</code>:</li>
</ul>
<pre><code>192.168.1.3 mail1
192.168.1.4 mail2
</code></pre>
<ul>
<li>add new disk on <code>mail1</code>:</li>
</ul>
<p>type 'n', and hit enter for next question, (dont forget to write) hit 'w'</p>
<pre><code>fdisk /dev/sdb
/sbin/mkfs.ext4 /dev/sdb1
mkdir /glusterfs1
</code></pre>
<p>Update <code>/etc/fstab</code>:</p>
<pre><code>/dev/sdb1 /glusterfs1 ext4 defaults 1 2
</code></pre>
<p>remount all:</p>
<pre><code>mount -a
</code></pre>
<ul>
<li>add new disk on mail2:</li>
</ul>
<p>type 'n', and hit enter for next question, (dont forget to write) hit 'w'</p>
<pre><code>fdisk /dev/sdb
/sbin/mkfs.ext4 /dev/sdb1
mkdir /glusterfs2
</code></pre>
<p>Update /etc/fstab:</p>
<pre><code>/dev/sdb1 /glusterfs2 ext4 defaults 1 2
</code></pre>
<p>remount all</p>
<pre><code>mount -a
</code></pre>
<h3 id="install-and-configure-gulsterfs">Install and Configure GulsterFS</h3>
<ul>
<li>on both servers (mail1 &amp; mail2):</li>
</ul>
<pre><code>yum -y install epel-release
yum -y install centos-release-gluster38.noarch
yum -y install glusterfs glusterfs-fuse glusterfs-server
</code></pre>
<p>activate the service</p>
<pre><code>systemctl enable glusterd.service
systemctl start glusterd.service
</code></pre>
<p>disabling firewall</p>
<pre><code>systemctl stop firewalld.service
systemctl disable firewalld.service
</code></pre>
<ul>
<li>on mail1:</li>
</ul>
<pre><code>gluster peer probe mail2
</code></pre>
<ul>
<li>on mail2:</li>
</ul>
<pre><code>gluster peer probe mail1
</code></pre>
<p>you can check status with command below:</p>
<pre><code>gluster peer status
</code></pre>
<ul>
<li>ONLY on mail1:</li>
</ul>
<pre><code>gluster volume create mailrep-volume replica 2 mail1:/glusterfs1/vmail mail2:/glusterfs2/vmail force
gluster volume start mailrep-volume
</code></pre>
<p>check it</p>
<pre><code>gluster volume info mailrep-volume
</code></pre>
<ul>
<li>create folder for vmail and mount glusterfs to vmail folder</li>
</ul>
<p>on mail1:</p>
<pre><code>mkdir /var/vmail
mount.glusterfs mail1:/mailrep-volume /var/vmail/
</code></pre>
<p>Update /etc/fstab</p>
<pre><code>mail1:/mailrep-volume /var/vmail glusterfs defaults,_netdev 0 0
</code></pre>
<p>remount all</p>
<pre><code>mount -a
</code></pre>
<p>check it</p>
<pre><code>df -h
</code></pre>
<ul>
<li>on mail2:</li>
</ul>
<pre><code>mkdir /var/vmail
mount.glusterfs mail2:/mailrep-volume /var/vmail/
</code></pre>
<p>Update /etc/fstab:</p>
<pre><code>mail2:/mailrep-volume /var/vmail glusterfs defaults,_netdev 0 0
</code></pre>
<p>remount all</p>
<pre><code>mount -a
</code></pre>
<p>check it</p>
<pre><code>df -h
</code></pre>
<p>you can test it by creating any files on one of your mail servers</p>
<pre><code>cd /var/vmail; touch R1 R2 R3 R4 R5 R6
</code></pre>
<p>make sure it, by checking files on both servers</p>
<pre><code>ls -la /var/vmail
</code></pre>
<h2 id="install-and-configure-iredmail">Install and configure iRedMail</h2>
<ul>
<li>
<p>Install the latest iRedMail on 2 servers (mail1 &amp; mail2)</p>
</li>
<li>
<p>For installing iRedMail on CentOS, please check its installation guide:
<a href="./install.iredmail.on.rhel.html">Install iRedMail on Red Hat Enterprise Linux, CentOS</a></p>
</li>
</ul>
<div class="admonition note">
<p class="admonition-title">Note</p>
<ul>
<li>
<p>install iRedMail on <code>mail1</code> first, after mail1 finish you can install it
to mail2 (better do not reboot after installing iRedMail, wait untill
finish install/configure)</p>
</li>
<li>
<p>Dont forget to choose LDAP and using default mail folder: <code>/var/vmail</code></p>
</li>
<li>Choose Nginx as web server</li>
</ul>
</div>
<h2 id="configure-ldap-replication-master-slave">Configure LDAP replication (Master-Slave)</h2>
<ul>
<li>on mail1 (MASTER), update <code>/etc/openldap/slapd.conf</code>:</li>
</ul>
<pre><code>moduleload syncprov
index entryCSN,entryUUID eq
overlay syncprov
syncprov-checkpoint 100 10
syncprov-sessionlog 200
</code></pre>
<ul>
<li>on mail2 (SLAVE), update <code>/etc/openldap/slapd.conf</code>:</li>
</ul>
<div class="admonition attention">
<p class="admonition-title">Attention</p>
<p>You can find password of bind dn <code>cn=vmail,dc=xx,dc=xx</code> in Postfix LDAP
query files under <code>/etc/postfix/ldap/</code>.</p>
</div>
<pre><code>syncrepl rid=001
provider=ldap://mail1:389
searchbase=&quot;dc=iredmail,dc=kom&quot;
bindmethod=simple
binddn=&quot;cn=vmail,dc=iredmail,dc=kom&quot;
credentials=erec3xiThBUW9QnnU9Bnifp3434
schemachecking=on
type=refreshOnly
retry=&quot;60 +&quot;
scope=sub
interval=00:00:01:00
attrs=&quot;*,+&quot;
</code></pre>
<p>on both servers set firewalld to accept gluster port, ldap port, and database to each servers,
or you can set by your own rules:</p>
<pre><code>firewall-cmd --permanent \
--zone=iredmail \
--add-rich-rule='rule family=&quot;ipv4&quot; source address=&quot;192.168.1.3/24&quot; port protocol=&quot;tcp&quot; port=&quot;389&quot; accept'
firewall-cmd --permanent \
--zone=iredmail \
--add-rich-rule='rule family=&quot;ipv4&quot; source address=&quot;192.168.1.4/24&quot; port protocol=&quot;tcp&quot; port=&quot;3306&quot; accept'
firewall-cmd --zone=iredmail --permanent --add-port=111/udp
firewall-cmd --zone=iredmail --permanent --add-port=24007/tcp
firewall-cmd --zone=iredmail --permanent --add-port=24008/tcp
firewall-cmd --zone=iredmail --permanent --add-port=24009/tcp
firewall-cmd --zone=iredmail --permanent --add-port=139/tcp
firewall-cmd --zone=iredmail --permanent --add-port=445/tcp
firewall-cmd --zone=iredmail --permanent --add-port=965/tcp
firewall-cmd --zone=iredmail --permanent --add-port=2049/tcp
firewall-cmd --zone=iredmail --permanent --add-port=38465-38469/tcp
firewall-cmd --zone=iredmail --permanent --add-port=631/tcp
firewall-cmd --zone=iredmail --permanent --add-port=963/tcp
firewall-cmd --zone=iredmail --permanent --add-port=49152-49251/tcp
</code></pre>
<p>reload firewall rules:</p>
<pre><code>firewall-cmd --complete-reload
</code></pre>
<p>Restart OpenLDAP service:</p>
<pre><code>systemctl restart slapd
</code></pre>
<h2 id="configure-mariadb-replication-master-master">Configure MariaDB replication (Master-Master)</h2>
<ul>
<li>on mail1, update <code>/etc/my.cnf</code>:</li>
</ul>
<pre><code>server-id = 1
log_bin = /var/log/mariadb/mariadb-bin.log
log-slave-updates
log-bin-index = /var/log/mariadb/log-bin.index
log-error = /var/log/mariadb/error.log
relay-log = /var/log/mariadb/relay.log
relay-log-info-file = /var/log/mariadb/relay-log.info
relay-log-index = /var/log/mariadb/relay-log.index
auto_increment_increment = 10
auto_increment_offset = 1
binlog_do_db = amavisd
binlog_do_db = iredadmin
binlog_do_db = roundcubemail
binlog_do_db = sogo
binlog-ignore-db=test
binlog-ignore-db=information_schema
binlog-ignore-db=mysql
binlog-ignore-db=iredapd
log-slave-updates
replicate-ignore-db=test
replicate-ignore-db=information_schema
replicate-ignore-db=mysql
replicate-ignore-db=iredapd
</code></pre>
<p>Restart MariaDB service:</p>
<pre><code>systemctl restart mariadb
</code></pre>
<p>*on mail2, update <code>/etc/my.cnf</code>:</p>
<pre><code>server-id = 2
log_bin = /var/log/mariadb/mariadb-bin.log
log-slave-updates
log-bin-index = /var/log/mariadb/log-bin.index
log-error = /var/log/mariadb/error.log
relay-log = /var/log/mariadb/relay.log
relay-log-info-file = /var/log/mariadb/relay-log.info
relay-log-index = /var/log/mariadb/relay-log.index
auto_increment_increment = 10
auto_increment_offset = 1
binlog_do_db = amavisd
binlog_do_db = iredadmin
binlog_do_db = roundcubemail
binlog_do_db = sogo
binlog-ignore-db=test
binlog-ignore-db=information_schema
binlog-ignore-db=mysql
binlog-ignore-db=iredapd
log-slave-updates
replicate-ignore-db=test
replicate-ignore-db=information_schema
replicate-ignore-db=mysql
replicate-ignore-db=iredapd
</code></pre>
<p>Restart MariaDB service:</p>
<pre><code>systemctl restart mariadb
</code></pre>
<h3 id="create-replicator-dbuser-on-both-servers">create replicator dbuser on both servers</h3>
<ul>
<li>on mail1, login as MariaDB root user, then execute sql commands below:</li>
</ul>
<pre><code>create user 'replicator'@'%' identified by '12345678';
grant replication slave on *.* to 'replicator'@'%';
SHOW MASTER STATUS;
+--------------------+----------+----------------------------------------------+-------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+--------------------+----------+----------------------------------------------+-------------------------------+
| mariadb-bin.000001 | 245 | amavisd,iredadmin,iredapd,roundcubemail,sogo | test,information_schema,mysql |
+--------------------+----------+----------------------------------------------+-------------------------------+
</code></pre>
<p>check master status in column <code>File</code> and <code>Position</code>:</p>
<ul>
<li>on mail2:</li>
</ul>
<pre><code>create user 'replicator'@'%' identified by '12345678';
grant replication slave on *.* to 'replicator'@'%';
slave stop;
CHANGE MASTER TO MASTER_HOST = '192.168.1.3', MASTER_USER = 'replicator', MASTER_PASSWORD = '12345678', MASTER_LOG_FILE = 'mariadb-bin.000001', MASTER_LOG_POS = 245;
slave start;
SHOW MASTER STATUS;
+--------------------+----------+----------------------------------------------+-------------------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+--------------------+----------+----------------------------------------------+-------------------------------+
| mariadb-bin.000001 | 289 | amavisd,iredadmin,iredapd,roundcubemail,sogo | test,information_schema,mysql |
+--------------------+----------+----------------------------------------------+-------------------------------+
show slave status\G;
</code></pre>
<ul>
<li>change to your own master status MASTER_LOG_FILE is from <code>File</code>, MASTER_LOG_POS is from <code>Position</code> of master mail1</li>
<li>check master status for <code>File</code> and <code>Position</code></li>
</ul>
<p>Restart MariaDB service:</p>
<pre><code>systemctl restart mariadb
</code></pre>
<ul>
<li>on mail1, login as MariaDB root user:</li>
</ul>
<pre><code>slave stop;
CHANGE MASTER TO MASTER_HOST = '192.168.1.4', MASTER_USER = 'replicator', MASTER_PASSWORD = '12345678', MASTER_LOG_FILE = 'mariadb-bin.000001', MASTER_LOG_POS = 289;
slave start;
show slave status\G;
exit;
</code></pre>
<ul>
<li>change to your own master status MASTER_LOG_FILE is from <code>File</code>, MASTER_LOG_POS is from <code>Position</code> of master mail2*.</li>
</ul>
<p>Restart MariaDB service:</p>
<pre><code>systemctl restart mariadb
</code></pre>
<ul>
<li>reboot one of mailserver and wait till up, then reboot the other mailserver</li>
</ul>
<h2 id="testing">Testing</h2>
<ul>
<li>For HA Testing, u can try to shutdown one of your server to testing it (ha1 or ha2 --/OR-- mail1 or mail2)</li>
<li>u can create users using iredadmin on mail1, then check users from mail2 and you can see its already sync</li>
<li>try to login using roundcubemail from any mailserver then u can check users on database 'roundcubemail-&gt;users', and its already sync</li>
<li>only mail1 'can add n modify' users</li>
<li>this mailservers act as Glusterserver &amp; Glusterclient, if u want to reboot the servers, please reboot first server untill this up then reboot the second server.</li>
<li>if all servers are reboot for the same time it will not mounting '/var/vmail' folder. u must force mount manually using this command 'gluster volume start mailrep-volume force'</li>
</ul>
<p>To view the DB easily, you may want to install adminer from <a href="http://adminer.org/">http://adminer.org/</a> (it's web-based SQL management tool, just a single PHP file):</p><div class="footer">
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