How to run multiple memcached instances
I had copied a PrestaShop site to another domain. Both domains are on same server, using same Memcached server for caching. When i visit one of the site, resources like css/js files are loading from other website. To fix this, i configured 2 Memcached servers running on 2 different ports, each site use its own Memcached instance.
On Ubuntu server, i installed memcached and supervisor with
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apt install -y memcached memcached |
Create file
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vi /etc/supervisor/conf.d/memcached.conf |
Inside add
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[program:memcached2] priority=200 command=/usr/bin/memcached -m 64 -p 11212 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached2.pid user=memcache autorestart=true autostart=true redirect_stderr=true |
By default Memcached runs on port 11211, above configuration will make an instance of Memcached that runs on port 11212.
If you want to create another instance of memcached, duplicate above lines, in the lines, change
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[program:memcached2] |
with
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[program:memcached3] |
Find
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command=/usr/bin/memcached -m 64 -p 11212 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached2.pid |
Replace port with different port, say 11213 and /var/run/memcached/memcached2.pid with /var/run/memcached/memcached2.pid
Here is the complete configuration with 2 Memcached instances running under supervisiord
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[program:memcached2] priority=200 command=/usr/bin/memcached -m 64 -p 11212 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached2.pid user=memcache autorestart=true autostart=true redirect_stderr=true [program:memcached3] priority=200 command=/usr/bin/memcached -m 64 -p 11213 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached3.pid user=memcache autorestart=true autostart=true redirect_stderr=true |
Reload supervisor
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supervisorctl reload |
Check status
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supervisorctl status |
Here is an example with 4 memcached instances running
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root@zen-keldysh:/etc/supervisor/conf.d# supervisorctl reload Restarted supervisord root@zen-keldysh:/etc/supervisor/conf.d# supervisorctl status memcached_erikoisrahti RUNNING pid 337864, uptime 0:00:02 memcached_longdrink24 RUNNING pid 337865, uptime 0:00:02 memcached_tulivesi RUNNING pid 337866, uptime 0:00:02 memcached_viskit RUNNING pid 337867, uptime 0:00:02 root@zen-keldysh:/etc/supervisor/conf.d# |
Here are the configuration file for above 4 Memcached instance setup
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root@server1:~# cat /etc/supervisor/conf.d/memcached.conf [program:memcached_longdrink24] priority=200 command=/usr/bin/memcached -m 64 -p 11212 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached2.pid user=memcache autorestart=true autostart=true redirect_stderr=true [program:memcached_viskit] priority=200 command=/usr/bin/memcached -m 64 -p 11213 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached-viskit.pid user=memcache autorestart=true autostart=true redirect_stderr=true [program:memcached_erikoisrahti] priority=200 command=/usr/bin/memcached -m 64 -p 11214 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached-erikoisrahti.pid user=memcache autorestart=true autostart=true redirect_stderr=true [program:memcached_tulivesi] priority=200 command=/usr/bin/memcached -m 64 -p 11215 -u memcache -l 127.0.0.1 -P /var/run/memcached/memcached-tulivesi.pid user=memcache autorestart=true autostart=true redirect_stderr=true root@server1:~# |