Visokodostupni WordPress – kompletan setup

Uvod

U ovom tekstu opisaćemo kako da sami podesite visokodostupnu WordPress instalaciju korišćenjem distribucije CentOS, distribuiranog fajl sistema GlusterFS i Percona XtraDB klastera. Komande koje treba pokretati su prikazane plavom bojom, njihov izlaz je belom, a crvenom bojom je obojen deo komande koji treba promeniti i prilagoditi vašem okruženju. Ukoliko ispred komande stoji [ALL]# onda se komanda izvršava na svim serverima, inače je unutar uglastih zagrada navedeno ime servera na kom treba pokrenuti tu komandu i direktorijum u kom se komanda pokreće. Obratiti pažnju na here-doc cat komande koje se prostiru u više redova do ključne reči END.

Podizanje mCloud mServer SSD1 instanci

Uzećemo 3 mCloud SSD servera, za početak sa 1GB RAM memorije i 2 CPU-a. Izabraćemo Centos 7 template.

Odabir mCloud SSD servera za visokodostupni WordPress sajt

Nazvaćemo ih u obliku mns-wp-N.ha.rs i popisati dobijene IP adrese.

Zabeležite imena i adrese vaših mCloud SSD servera za visokodostupni WordPress sajt.

Na svakoj od mašina instaliraćemo neke uobičajene pakete. Nisu svi neophodni, ali ih je zgodno imati:

[ALL]# yum -y install bash bc bind-utils elinks ftp htop html2text iotop iptraf joe jwhois logwatch lsof lynx mailx man man-pages mytop net-snmp net-snmp-utils nfs-utils ntp openssh-clients rsync screen strace sysstat tcpdump tcptraceroute vim vim-enhanced wget wireshark yum-plugin-security yum-utils pciutils dmidecode telnet attr net-tools http://download.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

Za početak, dopustićemo kompletan saobraćaj između ovih mašina. Ove korake radimo na svakoj mašini.

[ALL]# iptables -I INPUT -s 87.237.205.1/32 -j ACCEPT
[ALL]# iptables -I INPUT -s 87.237.205.2/32 -j ACCEPT
[ALL]# iptables -I INPUT -s 87.237.205.3/32 -j ACCEPT
[ALL]# iptables-save > /etc/sysconfig/iptables
[ALL]# echo 'iptables-restore < /etc/sysconfig/iptables' >> /etc/rc.local
[ALL]# chmod +x /etc/rc.local

Instalacija i podešavanje GlusterFS-a

Na svakoj od mašina zakucaćemo imena hostova u hosts fajlu:

[ALL]# cat >> /etc/hosts <<"END"
87.237.205.1 mns-wp-1.ha.rs mns-wp-1
87.237.205.2 mns-wp-2.ha.rs mns-wp-2
87.237.205.3 mns-wp-3.ha.rs mns-wp-3
END

Instaliraćemo i pokrenuti glusterfs:

[ALL]# wget -P /etc/yum.repos.d http://download.gluster.org/pub/gluster/glusterfs/LATEST/CentOS/glusterfs-epel.repo
[ALL]# yum -y install glusterfs glusterfs-fuse glusterfs-server
[ALL]# systemctl start glusterd

Omogućićemo i proveriti status:

[ALL]# systemctl enable glusterd
[ALL]# systemctl status glusterd
glusterd.service - GlusterFS, a clustered file-system server
   Loaded: loaded (/usr/lib/systemd/system/glusterd.service; enabled)
   Active: active (running) since Fri 2015-04-03 15:46:31 CEST; 3min 47s ago
  Process: 11199 ExecStart=/usr/sbin/glusterd -p /var/run/glusterd.pid (code=exited, status=0/SUCCESS)
 Main PID: 11200 (glusterd)
   CGroup: /system.slice/glusterd.service
           └─11200 /usr/sbin/glusterd -p /var/run/glusterd.pid

Povezaćemo servere u gluster pool. Ovo je dovoljno uraditi na jednom od servera.

[mns-wp-1 ~]# gluster peer probe mns-wp-2
peer probe: success.
[mns-wp-1 ~]# gluster peer probe mns-wp-3
peer probe: success.
[mns-wp-1 ~]# gluster peer probe mns-wp-1
peer probe: success. Probe on localhost not needed

Sada možemo proveriti status pool-a:

[ALL]# gluster pool list
UUID                                    Hostname        State
a32d208c-7966-4af2-80d0-a42ec3568bbe    mns-wp-2        Connected
6ed8f0c7-01f2-4951-a663-5e73dba405b1    mns-wp-3        Connected
c96c8c8e-5b30-448f-8177-a7ef0d9a325e    localhost       Connected

Na jednoj od mašina pravimo klaster od tri mašine i tri replike podataka. Koristimo opciju force jer /srv/vol0 nije na zasebnom fajl sistemu:

[mns-wp-1 ~]# gluster volume create vol0 rep 3 transport tcp mns-wp-1:/srv/vol0 mns-wp-2:/srv/vol0 mns-wp-3:/srv/vol0 force
volume create: vol0 success
[mns-wp-1 ~]# gluster volume start vol0
volume start: vol0: success

Proveravamo status novog volumena. Svi brick-ovi i self-heal daemoni bi trebalo da budu online.

[mns-wp-1 ~]# gluster vol status vol0
Status of volume: vol0
Gluster process                                         Port    Online  Pid
------------------------------------------------------------------------------
Brick mns-wp-1:/srv/vol0                                49152   Y       1316
Brick mns-wp-2:/srv/vol0                                49152   Y       1899
Brick mns-wp-3:/srv/vol0                                49152   Y       859
NFS Server on localhost                                 N/A     N       N/A
Self-heal Daemon on localhost                           N/A     Y       2593
NFS Server on mns-wp-2                                  N/A     N       N/A
Self-heal Daemon on mns-wp-2                            N/A     Y       1997
NFS Server on mns-wp-3                                  N/A     N       N/A
Self-heal Daemon on mns-wp-3                            N/A     Y       871

Task Status of Volume vol0
------------------------------------------------------------------------------
There are no active volume tasks

Pošto su glusterfs serveri u isto vreme i klijenti možemo koristiti localhost da prikačimo glusterfs volumen na svim serverima:

[ALL]# mkdir -p /var/www/html/
[ALL]# mount -t glusterfs localhost:/vol0 /var/www/html
[ALL]# echo "localhost:/vol0 /var/www/html glusterfs defaults,_netdev 0 0" >> /etc/fstab

Preporučene opcije za bolje performanse:

[mns-wp-1 ~]# gluster vol set vol0 performance.quick-read on
volume set: success
[mns-wp-1 ~]# gluster vol set vol0 performance.read-ahead on
volume set: success
[mns-wp-1 ~]# gluster vol set vol0 performance.io-cache on
volume set: success
[mns-wp-1 ~]# gluster vol set vol0 performance.cache-size 256MB
volume set: success
[mns-wp-1 ~]# gluster vol set vol0 performance.stat-prefetch on 
volume set: success 
[mns-wp-1 ~]# gluster vol set vol0 performance.write-behind-window-size 4MB 
volume set: success 
[mns-wp-1 ~]# gluster vol set vol0 performance.flush-behind on 
volume set: success

Ove opcije se prikazuju zajedno sa informacijama o volumenu:

[ALL]# gluster vol info vol0
Volume Name: vol0
Type: Replicate
Volume ID: c8cf45c4-bff5-42fb-b065-516de82ebb03
Status: Started
Number of Bricks: 1 x 3 = 3
Transport-type: tcp
Bricks:
Brick1: mns-wp-1:/srv/vol0
Brick2: mns-wp-2:/srv/vol0
Brick3: mns-wp-3:/srv/vol0
Options Reconfigured:
performance.write-behind-window-size: 4MB
performance.flush-behind: on
performance.stat-prefetch: on
performance.io-cache: on
performance.read-ahead: on
performance.quick-read: on
performance.cache-size: 256MB

Instalacija i podešavanje Percona XtraDB cluster-a

Instaliramo i podešavamo osnovni my.cnf fajl za Percona XtraDB Cluster na svakom serveru:

[ALL]# yum -y install http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm
[ALL]# yum -y install Percona-XtraDB-Cluster-56
[ALL]# cat > /etc/my.cnf <<END
[mysqld]
datadir=/var/lib/mysql
user=mysql
# Path to Galera library
wsrep_provider=/usr/lib64/libgalera_smm.so
# Cluster connection URL contains the IPs of node#1, node#2 and node#3
wsrep_cluster_address=gcomm://87.237.205.1,87.237.205.2,87.237.205.3
# In order for Galera to work correctly binlog format should be ROW
binlog_format=ROW
# MyISAM storage engine has only experimental support
default_storage_engine=InnoDB
# This changes how InnoDB autoincrement locks are managed and is a requirement for Galera
innodb_autoinc_lock_mode=2
# SST method
wsrep_sst_method=xtrabackup-v2
# Cluster name
wsrep_cluster_name=my_wordpress_cluster
# My name
wsrep_node_name=$(hostname -s)
# Authentication for SST method
wsrep_sst_auth="sstuser:s3cr3t"
# Try to replicate even MyISAM
wsrep_replicate_myisam=1
END

Na jednom serveru pokrećemo bootstrap XtraDB klastera:

[mns-wp-1 ~]# systemctl start mysql@bootstrap.service

Za state transfer između članova klastera potreban je zaseban mysql korisnik. Ovde odaberite neku komplikovanu šifru:

[mns-wp-1 ~]# mysql -e 'CREATE USER "sstuser"@"localhost" IDENTIFIED BY "s3cr3t";'
[mns-wp-1 ~]# mysql -e 'GRANT RELOAD, LOCK TABLES, REPLICATION CLIENT ON *.* TO "sstuser"@"localhost";'

Na drugim serverima samo startujemo mysql nakon što smo instalirali Percona XtraDB Cluster i podesili my.cnf:

[mns-wp-2 ~]# systemctl start mysql
[mns-wp-3 ~]# systemctl start mysql

Omogućićemo mysql servis da bi se automatski startovao prilikom starta sistema:

[ALL]# systemctl enable mysql

WordPress treba da ima svog mysql korisnika, izaberite mu neku komplikovanu šifru:

[mns-wp-1 ~]# mysql -e 'CREATE DATABASE wordpress;'
[mns-wp-1 ~]# mysql -e 'CREATE USER "wpuser"@"%" IDENTIFIED BY "mojavrloduGcka_iKOmplik0v4na_sifra";'
[mns-wp-1 ~]# mysql -e 'GRANT ALL PRIVILEGES ON wordpress.* TO "wpuser"@"%";'

Za proveru zdravlja noda u klasteru može se koristiti komanda clustercheck koja se podrazumevano kači kao korisnik „clustercheckuser“ sa šifrom „clustercheckpassword!“. Poželjno je da ne koristite tu šifru, već da je promenite.

[mns-wp-1 ~]# mysql -e 'GRANT PROCESS ON *.* TO `clustercheckuser`@`localhost` IDENTIFIED BY "clustercheckpassword!";'
[ALL]# clustercheck
HTTP/1.1 200 OK
Content-Type: text/plain
Connection: close
Content-Length: 40

Percona XtraDB Cluster Node is synced.

Parametri i status klastera mogu se videti u sistemskim promenljivama čija imena počinju sa wsrep:

[ALL]# mysql -e 'show status like "wsrep_cluster_size";'
+--------------------+-------+
| Variable_name      | Value |
+--------------------+-------+
| wsrep_cluster_size | 3     |
+--------------------+-------+
[ALL]# mysql -e 'show status like "wsrep_cluster_status";'
+----------------------+---------+
| Variable_name        | Value   |
+----------------------+---------+
| wsrep_cluster_status | Primary |
+----------------------+---------+
[ALL]# mysql -e 'show status like "wsrep_local_state_comment";'
+---------------------------+--------+
| Variable_name             | Value  |
+---------------------------+--------+
| wsrep_local_state_comment | Synced |
+---------------------------+--------+

Takođe, preporuka je da obezbedite svoje mysql instalacije uklanjanjem anonimnog pristupa i postavljanjem šifre root korisnika mysql-a:

[ALL]# mysql_secure_installation

Instalacija WordPress-a korišćenjem NginX, PHP-FPM, WP-CLI

Instaliraćemo osnovne PHP pakete. Već smo ranije importovali EPEL repozitorijum iz kog su neki od ovih paketa.

[ALL]# yum -y install \
        php-common              \
        php-fpm                 \
        php-gd                  \
        php-cli                 \
        php-pdo                 \
        php-mysqlnd             \
        php-bcmath              \
        php-mcrypt              \
        php-xml                 \
        php-mbstring            \
        php-xmlrpc              \
        php-pecl-memcache       \
        php-pecl-memcached      \
        php-pecl-apc            \
        php-devel               \
        php-dba                 \
        php-odbc                \
        php-pecl-amqp           \
        php-pgsql               \
        php-pspell              \
        php-recode              \
        php-redis               \
        php-snmp                \
        php-soap                \
        php-tidy                \
        php-pecl-mongo          \
        php-pecl-solr           \
        php-pecl-sphinx

Dodaćemo sistemskog korisnika wpuser i grupu wpuser. WordPress fajlovi će pripadati ovom korisniku.

[ALL]# useradd -d /var/www/html/wordpress -m wpuser
[mns-wp-1 ~]# chmod go+rx /var/www/html/wordpress

Za instalaciju i podešavanje samog WordPress-a koristićemo WP-CLI kog pokrećemo kao korisnik wpuser:

[mns-wp-1 ~]# cd /var/www/html/
[mns-wp-1 /var/www/html]# wget https://raw.githubusercontent.com/wp-cli/builds/gh-pages/phar/wp-cli.phar
[ALL]# sudo -u wpuser php /var/www/html/wp-cli.phar --info
PHP binary:     /usr/bin/php
PHP version:    5.4.16
php.ini used:   /etc/php.ini
WP-CLI root dir:        phar://wp-cli.phar
WP-CLI global config:
WP-CLI project config:
WP-CLI version: 0.18.0

[ALL]# echo alias wp='"sudo -u wpuser php /var/www/html/wp-cli.phar"' >> ~/.bashrc
[ALL]# source ~/.bashrc

Instaliramo i podešavamo WordPress:

[mns-wp-1 ~]# cd /var/www/html/wordpress
[mns-wp-1 /var/www/html/wordpress]# wp core download
Success: WordPress downloaded.
[mns-wp-1 /var/www/html/wordpress]# wp core config --dbname=wordpress --dbuser=wpuser --dbpass=mojavrloduGcka_iKOmplik0v4na_sifra
Success: Generated wp-config.php file.
[mns-wp-1 /var/www/html/wordpress]# wp core install --url=wp.ha.rs --title=MyHAWP --admin_user=wpadmin --admin_password=drugaduGack4_iCooomplikv4na_fra --admin_email=marko@ha.rs
Success: WordPress installed successfully.
[mns-wp-1 /var/www/html/wordpress]# wp option update home http://wp.ha.rs
Success: Updated 'home' option.
[mns-wp-1 /var/www/html/wordpress]# wp option update siteurl http://wp.ha.rs
Success: Updated 'siteurl' option.

Iako sam WordPress ne koristi PHP sesije, mnogi plugin-ovi ih koriste, pa ćemo podesiti memcache za čuvanje sesija:

[ALL]# yum -y install memcached
[ALL]# systemctl enable memcached
[ALL]# systemctl start memcached
[ALL]# cat >> /etc/php.d/memcache.ini <<END
session.save_handler=memcache
session.save_path='tcp://87.237.205.1:11211, tcp://87.237.205.2:11211, tcp://87.237.205.3:11211'
END

Zbog bezbednosti, nećemo izvršavati PHP-FPM kao korisnik wpuser, već kao korisnik apache, ali kao grupa wpuser. Korisnik wpuser će tako moći da dodeli svojoj grupi da može da piše po određenim fajlovima i direktorijumima. Takođe, podesićemo vremensku zonu, omogućiti php-fpm servis i startovati ga:

[ALL]# sed -i 's/group = apache/group = wpuser/' /etc/php-fpm.d/www.conf
[ALL]# sed -i 's/;date.timezone.*/date.timezone = Europe\/Belgrade/g' /etc/php.ini
[ALL]# systemctl enable php-fpm
ln -s '/usr/lib/systemd/system/php-fpm.service' '/etc/systemd/system/multi-user.target.wants/php-fpm.service'
# systemctl start php-fpm

Nakon starta, trebalo bi da se php-fpm procesi nadju u listi procesa:

[ALL]# ps -Leo pid,user,group,args | grep php-fpm
17464 root     root     php-fpm: master process (/etc/php-fpm.conf)
17465 apache   wpuser   php-fpm: pool www
17466 apache   wpuser   php-fpm: pool www
17467 apache   wpuser   php-fpm: pool www
17468 apache   wpuser   php-fpm: pool www
17469 apache   wpuser   php-fpm: pool www
18576 root     root     grep --color=auto php-fpm

Instaliraćemo najnoviji nginx:

[ALL]# yum -y install http://nginx.org/packages/rhel/7/noarch/RPMS/nginx-release-rhel-7-0.el7.ngx.noarch.rpm
[ALL]# yum -y install nginx

A konfigurisaćemo ga prema standardnim preporukama za WordPress sajt (npr. na https://github.com/Romke-vd-Meulen/nginx-config ):

[ALL]# echo 'fastcgi_param   SCRIPT_FILENAME         $document_root$fastcgi_script_name;' >> /etc/nginx/fastcgi_params
[ALL]# echo 'fastcgi_param   PATH_TRANSLATED         $document_root$fastcgi_path_info;' >> /etc/nginx/fastcgi_params
[ALL]# cat > /etc/nginx/nginx.conf <<"END"
# Generic startup file.
user nginx wpuser;
worker_processes  2;
error_log  /var/log/nginx/error.log;
pid        /var/run/nginx.pid;
events {
        worker_connections  1024;
}

http {
        include       /etc/nginx/mime.types;
        default_type       application/octet-stream;
        access_log         /var/log/nginx/access.log;
        sendfile           on;
#       tcp_nopush         on;
        keepalive_timeout  3;
#       tcp_nodelay        on;
        gzip               on;
        # php max upload limit cannot be larger than this
        client_max_body_size 32m;
        index              index.php index.html index.htm;

        # Upstream to abstract backend connection(s) for PHP.
        upstream php {
                #this should match value of "listen" directive in php-fpm pool
#               server unix:/tmp/php-fpm.sock;
                server 127.0.0.1:9000;
        }

    include /etc/nginx/conf.d/*.conf;
}
END

Podrazumevani virtualni host uključuje dodatne konfiguracione fajlove:

[ALL]# cat > /etc/nginx/conf.d/default.conf <<"END"
server {
        server_name  _;
        listen 0.0.0.0:8080;
        rewrite ^ $scheme://wp.ha.rs$request_uri redirect;
}

server {
        server_name wp.ha.rs;
        listen 0.0.0.0:8080;
        root /var/www/html/wordpress;
	index index.php;
        include global/restrictions.conf;
        # Additional rules go here.

	# Only include one of the files below.
        include global/wordpress.conf;
#        include global/wordpress-ms-subdir.conf;
#        include global/wordpress-ms-subdomain.conf;
}
END

Fajl restrictions.conf:

[ALL]# mkdir -p /etc/nginx/global
[ALL]# cat > /etc/nginx/global/restrictions.conf <<"END"
# Global restrictions configuration file.
# Designed to be included in any server {} block.
location = /favicon.ico {
        log_not_found off;
        access_log off;
}

location = /robots.txt {
        allow all;
        log_not_found off;
        access_log off;
}

# Deny all attempts to access hidden files such as .htaccess, .htpasswd, .DS_Store (Mac).
# Keep logging the requests to parse later (or to pass to firewall utilities such as fail2ban)
location ~ /\. {
        deny all;
}

# Deny access to any files with a .php extension in the uploads directory
# Works in sub-directory installs and also in multisite network
# Keep logging the requests to parse later (or to pass to firewall utilities such as fail2ban)
location ~* /(?:uploads|files)/.*\.php$ {
        deny all;
}
END

Fajl wordpress.conf:

[ALL]# cat > /etc/nginx/global/wordpress.conf <<"END"
# WordPress single blog rules.
# Designed to be included in any server {} block.

# This order might seem weird - this is attempted to match last if rules below fail.
# http://wiki.nginx.org/HttpCoreModule
location / {
        try_files $uri $uri/ /index.php?$args;
}

# Add trailing slash to */wp-admin requests.
rewrite /wp-admin$ $scheme://$host$uri/ permanent;

# Directives to send expires headers and turn off 404 error logging.
location ~* ^.+\.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ {
       access_log off; log_not_found off; expires max;
}

# Uncomment one of the lines below for the appropriate caching plugin (if used).
#include global/wordpress-wp-super-cache.conf;
#include global/wordpress-w3-total-cache.conf;

# Pass all .php files onto a php-fpm/php-fcgi server.
location ~ [^/]\.php(/|$) {
        fastcgi_split_path_info ^(.+?\.php)(/.*)$;
        if (!-f $document_root$fastcgi_script_name) {
                return 404;
	}
	# This is a robust solution for path info security issue and works with "cgi.fix_pathinfo = 1" in /etc/php.ini (default)
        include fastcgi_params;
        fastcgi_index index.php;
#        fastcgi_intercept_errors on;
        fastcgi_pass php;
}
END

Nakon toga možemo omogućiti i startovati nginx:

[ALL]# systemctl enable nginx
ln -s '/usr/lib/systemd/system/nginx.service' '/etc/systemd/system/multi-user.target.wants/nginx.service'
[ALL]# systemctl start nginx

Instalacija i podešavanje HAProxy-a

Instaliramo haproxy i podešavamo ga za proksiranje ka nginx-ovima:

[ALL]# yum -y install haproxy
[ALL]# cat > /etc/haproxy/haproxy.cfg <<"END"
global
    log         127.0.0.1 local2
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    user        haproxy
    group       haproxy
    daemon
    stats socket /var/lib/haproxy/stats

defaults
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 3000

listen stats :9090
    mode http
    stats enable
    stats realm Haproxy
    stats uri /
    stats auth wpha:wphahapr0

frontend  main *:80
    default_backend             app
backend app
    balance    roundrobin
    option     forwardfor
    option     httpchk GET /hacheck.php HTTP/1.1\r\nHost:wp.ha.rs
    http-check expect string OK
    server  mns-wp-1 87.237.205.1:8080 check
    server  mns-wp-2 87.237.205.2:8080 check
    server  mns-wp-3 87.237.205.3:8080 check
listen mysql-cluster 0.0.0.0:3307
    mode tcp
    balance roundrobin
    option httpchk
    server mns-wp-1 87.237.205.1:3306 check port 9200 inter 12000 rise 3 fall 3
    server mns-wp-2 87.237.205.2:3306 check port 9200 inter 12000 rise 3 fall 3
    server mns-wp-3 87.237.205.3:3306 check port 9200 inter 12000 rise 3 fall 3
END

Pripremamo haproxy proveru za nginx i php-fpm:

[mns-wp-1 ~]# echo -n '<?php echo "OK";?>' > /var/www/html/wordpress/hacheck.php

Pripremamo haproxy proveru za bazu:

[ALL]# echo 'mysqlchk 9200/tcp # mysqlchk' >> /etc/services
[ALL]# yum -y install xinetd
[ALL]# cat > /etc/xinetd.d/mysqlchk <<"END"
# default: on
# description: mysqlchk
service mysqlchk
{
 disable = no
 flags = REUSE
 socket_type = stream
 port = 9200
 wait = no
 user = nobody
 server = /usr/bin/clustercheck
 log_on_failure += USERID
 only_from = 87.237.205.1 87.237.205.2 87.237.205.3
 per_source = UNLIMITED
}
END

Omogućavamo i startujemo xinetd

[ALL]# systemctl enable xinetd
[ALL]# systemctl start xinetd

Podešavamo WordPress da se kači na haproxy:

[mns-wp-1 ~]# sed -i "s/'DB_HOST', 'localhost'/'DB_HOST', '127.0.0.1:3307'/" /var/www/html/wordpress/wp-config.php

Omogućavamo i startujemo haproxy

[ALL]# systemctl enable haproxy
[ALL]# systemctl start haproxy

Instalacija i aktivacija W3 Total Cache-a

[mns-wp-1 /var/www/html/wordpress]# wp plugin install https://downloads.wordpress.org/plugin/w3-total-cache.0.9.4.1.zip
Downloading install package from https://downloads.wordpress.org/plugin/w3-total-cache.0.9.4.1.zip...
Unpacking the package...
Installing the plugin...
Plugin installed successfully.
[mns-wp-1 /var/www/html/wordpress]# wp plugin list
+----------------+----------+-----------+---------+
| name           | status   | update    | version |
+----------------+----------+-----------+---------+
| akismet        | inactive | available | 3.0.4   |
| hello          | inactive | none      | 1.6     |
| w3-total-cache | inactive | none      | 0.9.4.1 |
+----------------+----------+-----------+---------+
[mns-wp-1 /var/www/html/wordpress]# wp plugin activate w3-total-cache
Success: Plugin 'w3-total-cache' activated.

Podesite W3 Total Cache na standardan način tako da se koriste sva tri memcached servera. Takođe podesite da se Object cache snima u sva tri memcached servera.

Gotovo! Srećno HAWP-ovanje! 🙂