（6）docker安装memcached

docker安装memcached

Memcached是全内存的数据缓冲系统，Redis虽然支持数据的持久化，但是全内存毕竟才是其高性能的本质。作为基于内存的存储系统来说，机器物理内存的大小就是系统能够容纳的最大数据量。如果需要处理的数据量超过了单台机器的物理内存大小，就需要构建分布式集群来扩展存储能力。

Memcached本身并不支持分布式，因此只能在客户端通过像一致性哈希这样的分布式算法来实现Memcached的分布式存储。下图给出了Memcached的分布式存储实现架构。当客户端向Memcached集群发送数据之前，首先会通过内置的分布式算法计算出该条数据的目标节点，然后数据会直接发送到该节点上存储。但客户端查询数据时，同样要计算出查询数据所在的节点，然后直接向该节点发送查询请求以获取数据。

拉取镜像

[root@starseaing ~]# docker pull memcached:1.5.14
1.5.14: Pulling from library/memcached
27833a3ba0a5: Already exists 
249e7cd3e34c: Pull complete 
92ac80ecde7a: Pull complete 
bcb670b42f9a: Pull complete 
65a85dcc65cb: Pull complete 
Digest: sha256:5591322c5875fa18f87b0adb93174a116b8d8489c2bf433bba6240dfffb6ffa0
Status: Downloaded newer image for memcached:1.5.14

运行镜像：

-d是启动一个守护进程；
-m是分配给Memcache使用的内存数量，单位是MB；
-u是运行Memcache的用户；
-l是监听的服务器IP地址，可以有多个地址；
-p是设置Memcache监听的端口，，最好是1024以上的端口；
-c是最大运行的并发连接数，默认是1024；

最终的启动脚本为：

docker run --name memcached -m 256m -p 11211:11211 -d memcached:1.5.14

连接测试memcached

我们可以通过 telnet 命令并指定主机ip和端口来连接 Memcached 服务。
语法：
telnet HOST PORT

命令中的 HOST 和 PORT 为运行 Memcached 服务的 IP 和端口。

telnet 127.0.0.1 11211
Trying 127.0.0.1...
Connected to 127.0.0.1.

设置值：
set foo 0 0 3
bar
STORED

获取值：
get foo
VALUE foo 0 3
bar
END

stats
STAT pid 1
STAT uptime 617
STAT time 1557072265
STAT version 1.5.14
STAT libevent 2.0.21-stable
STAT pointer_size 64
STAT rusage_user 0.108347
STAT rusage_system 0.050006
STAT max_connections 1024
STAT curr_connections 2
STAT total_connections 3
STAT rejected_connections 0
STAT connection_structures 3
STAT reserved_fds 20
STAT cmd_get 1
STAT cmd_set 2
STAT cmd_flush 0
STAT cmd_touch 0
STAT get_hits 1
STAT get_misses 0
STAT get_expired 0
STAT get_flushed 0
STAT delete_misses 0
STAT delete_hits 0
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 62
STAT bytes_written 83
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 slab_reassign_rescues 0
STAT slab_reassign_chunk_rescues 0
STAT slab_reassign_evictions_nomem 0
STAT slab_reassign_inline_reclaim 0
STAT slab_reassign_busy_items 0
STAT slab_reassign_busy_deletes 0
STAT slab_reassign_running 0
STAT slabs_moved 0
STAT lru_crawler_running 0
STAT lru_crawler_starts 1020
STAT lru_maintainer_juggles 815
STAT malloc_fails 0
STAT log_worker_dropped 0
STAT log_worker_written 0
STAT log_watcher_skipped 0
STAT log_watcher_sent 0
STAT bytes 65
STAT curr_items 1
STAT total_items 1
STAT slab_global_page_pool 0
STAT expired_unfetched 0
STAT evicted_unfetched 0
STAT evicted_active 0
STAT evictions 0
STAT reclaimed 0
STAT crawler_reclaimed 0
STAT crawler_items_checked 0
STAT lrutail_reflocked 0
STAT moves_to_cold 1
STAT moves_to_warm 0
STAT moves_within_lru 0
STAT direct_reclaims 0
STAT lru_bumps_dropped 0
END

来源：CSDN

作者：我叫小菜菜

链接：https://blog.csdn.net/zhi_ai_yaya/article/details/90510936

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Docker

stat

memcached

memcached命令