インストール

$ sudo apt install memcached php-memcached
$ systemctl status memcached
● memcached.service - memcached daemon
   Loaded: loaded (/lib/systemd/system/memcached.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2016-12-01 07:40:08 EST; 14s ago
 Main PID: 5243 (memcached)
   CGroup: /system.slice/memcached.service
           └─5243 /usr/bin/memcached -m 64 -p 11211 -u memcache -l 127.0.0.1

$ sudo systemctl restart memcached
$ sudo systemctl restart php7.0-fpm

Drupal 設定例

$ sudo vim sites/default/settings.php
// Memcache
$conf['cache_backends'][] = 'sites/all/modules/memcache/memcache.inc';
$conf['cache_default_class'] = 'MemCacheDrupal';
$conf['cache_class_cache_form'] = 'DrupalDatabaseCache';
$conf['page_cache_without_database'] = TRUE;
$conf['page_cache_invoke_hooks'] = FALSE;
$conf['memcache_key_prefix'] = 'somethingunique';

モニタリング

$ watch "echo stats | nc 127.0.0.1 11211"
Every 2.0s: echo stats | nc 127.0.0.1 11211                                                                                             Thu Dec  1 08:13:21 2016

STAT pid 5647
STAT uptime 1644
STAT time 1480598001
STAT version 1.4.25 Ubuntu
STAT libevent 2.0.21-stable
STAT pointer_size 64
STAT rusage_user 0.072000
STAT rusage_system 0.180000
STAT curr_connections 5
STAT total_connections 46
STAT connection_structures 7
STAT reserved_fds 20
STAT cmd_get 3457
STAT cmd_set 2901
STAT cmd_flush 0
STAT cmd_touch 0
STAT get_hits 566
STAT get_misses 2891
STAT delete_misses 34
STAT delete_hits 14
STAT incr_misses 0
STAT incr_hits 0
STAT decr_misses 0
STAT decr_hits 0
STAT cas_misses 0
STAT cas_hits 0
STAT cas_badval 0
STAT touch_hits 0
STAT touch_misses 0
STAT auth_cmds 0
STAT auth_errors 0
STAT bytes_read 11465158
STAT bytes_written 17350774
STAT limit_maxbytes 67108864
STAT accepting_conns 1
STAT listen_disabled_num 0
STAT time_in_listen_disabled_us 0
STAT threads 4
STAT conn_yields 0
STAT hash_power_level 16
STAT hash_bytes 524288
STAT hash_is_expanding 0
STAT malloc_fails 0
STAT bytes 9273749
STAT curr_items 2839
STAT total_items 2901
STAT expired_unfetched 0
STAT evicted_unfetched 0
STAT evictions 0
STAT reclaimed 0
STAT crawler_reclaimed 0
STAT crawler_items_checked 0
STAT lrutail_reflocked 0
END