【监控】netstat+telnet+m-top+phpmemcached

1G=1024*1024*1024=1073741824 bytes

 

 

一、缓存命中率 = get_hits/cmd_get * 100%
二、get_misses的数字加上get_hits应该等于cmd_get
三、total_items == cmd_set == get_misses，当可用最大内存用光时，
memcached就会删掉一些内容，等式就会不成立

 

 

---------------------------------------------------  netstat

 

netstat -anp | grep memcached

 

netstat -n| grep 12000

 

查找较多time_wait连接

netstat -n| grep 12000 |grep TIME_WAIT|awk '{print $5}'|sort|uniq -c|sort -rn|head -n20

 

 

 

------------------------------------------phpmemcached

 

见附件  memcachephp.zip 

-------------------------------------memcached-top

 

见附件 memcache-top-v0.rar 

 

perl memcache-top-v0.6 --instances=192.168.1.252:12000,192.168.1.241:12000

 

 

 

 

 

 

 

memcache-top v0.6       (default port: 11211, color: on, refresh: 3 seconds)

 

INSTANCE                USAGE   HIT %   CONN    TIME    EVICT/s READ/s  WRITE/s

192.168.1.252:12000     0.3%    0.0%    77      0.8ms   0.0     2       201

192.168.1.241:12000     0.0%    0.0%    55      1.2ms   0.0     134     1380

 

AVERAGE:                0.2%    0.0%    66      1.0ms   0.0     68      790

 

TOTAL:          1.8MB/  1.0GB           132     2.0ms   0.0     136     1581

(ctrl-c to quit.)

------------------------------------telnet

 

 

用telnet测试memcached

telnet 127.0.0.1 11211

Trying 127.0.0.1…

Connected to zou.yunhao (127.0.0.1).

Escape character is ‘^]’.

set key 0 10 6   //10表示过期时间10秒，6表示将要存入数据字节为6（这里result为6）

result

STORED

get key

VALUE key 0 6

result

END

4）memcached性能查看命令stats

telnet 127.0.0.1 11211

stats

STAT pid 18006

STAT uptime 702   //memcached运行的秒数

STAT time 1292904537 //memcached服务器所在主机当前系统的时间，单位是秒。

STAT version 1.4.5

STAT pointer_size 64  //服务器所在主机操作系统的指针大小，一般为32或64

STAT rusage_user 0.003999

STAT rusage_system 0.013997

STAT curr_connections 10   //表示当前的连接数

STAT total_connections 11   //表示从memcached服务启动到当前时间，系统打开过的连接的总数。

STAT connection_structures 11  //服务器分配的连接构造数

STAT cmd_get 0   //查询缓存的次数，平均每秒缓存次数cmd_get/uptime

STAT cmd_set 0   //设置key=>value的次数

STAT cmd_flush 0

STAT get_hits 0  //缓存命中的次数，缓存命中率=get_hits/cmd_get*100%

STAT get_misses 0  //cmd_get-get_hits

STAT delete_misses 0   delete未命中次数

STAT delete_hits 0    delete命中次数

STAT incr_misses 0  总未命中次数

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 auth_cmds 0

STAT auth_errors 0

STAT bytes_read 7  //memcached服务器从网络读取的总的字节数

STAT bytes_written 0  //memcached服务器发送到网络的总的字节数。

STAT limit_maxbytes 67108864  //memcached服务缓存允许使用的最大字节数  分配给memcache的内存大小（字节）

STAT accepting_conns 1

STAT listen_disabled_num 0

STAT threads 4  当前线程数

STAT conn_yields 0

STAT bytes 0

STAT curr_items 0  服务器当前存储的items数量

STAT total_items 0  从服务器启动以后存储的items总数量

STAT evictions 0  为获取空闲内存而删除的items数（分配给memcache的空间用满后需要删除旧的items来得到空间分配给新的items）

STAT reclaimed 0

END

quit 退出

STAT pid 1253
STAT uptime 76637
STAT time 1305776802
STAT version 1.4.5
STAT pointer_size 32
STAT rusage_user 2.339644
STAT rusage_system 14.290827
STAT curr_connections 5
STAT total_connections 88669
STAT connection_structures 79
STAT cmd_get 88660
STAT cmd_set 88661
STAT cmd_flush 0
STAT get_hits 73875
STAT get_misses 14785
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 auth_cmds 0
STAT auth_errors 0
STAT bytes_read 79554683
STAT bytes_written 65724855
STAT limit_maxbytes 10485760
STAT accepting_conns 1
STAT listen_disabled_num 0
STAT threads 4
STAT conn_yields 0
STAT bytes 4149748
STAT curr_items 5171
STAT total_items 88660
STAT evictions 0
STAT reclaimed 9610

-------------------------------

[root@jushanweb1 ~]# telnet 192.168.12.201 13002
Trying 192.168.12.201...
Connected to 192.168.12.201 (192.168.12.201).
Escape character is '^]'.
stats
STAT pid 8382
STAT uptime 190574
STAT time 1301579774
STAT version 1.2.0
STAT pointer_size 32
STAT rusage_user 0.003999
STAT rusage_system 0.033994
STAT curr_items 1
STAT total_items 1
STAT bytes 50
STAT curr_connections 2
STAT total_connections 4
STAT connection_structures 3
STAT cmd_get 0
STAT cmd_set 1
STAT get_hits 0
STAT get_misses 0
STAT bytes_read 216
STAT bytes_written 92
STAT limit_maxbytes 524288000
END

监控

1）nagios监控

a. check_memcached

先要安装check_memcached插件

wget http://search.cpan.org/CPAN/authors/id/Z/ZI/ZIGOROU/Nagios-Plugins-Memcached-0.02.tar.gz

tar xzvf Nagios-Plugins-Memcached-0.02.tar.gz

cd Nagios-Plugins-Memcached-0.02

perl Makefile.PL   (可能需要其他perl的modules，依照提示通过cpan安装即可）

make && make install

check_memcached [-H host:port] [-w warnings] [-c critical] [--size-warnng size-warnng] [--size-critical size-critical] [--hit-warning hit-warning] [--hit-critical

hit-critical] [-t timeout]

b. /check_tcp -H host -p 11211 -t 5 -E -s ‘stats\r\nquit\r\n’ -e ‘uptime’ -M crit

2）cacti监控

一台服务器起多个memcached，多端口cacti部署监控。

a. 需要一个 Python memcached Client API

wget ftp://ftp.tummy.com/pub/python-memcached/python-memcached-1.45.tar.gz

tar xzvf python-memcached-1.45.tar.gz

cd python-memcached-1.45

python setup.py install

b. 加模板memcached multiport

wget http://tag1consulting.com/blog/cacti-memcache-multi-port-templates

cp memcached.py   <cacti install目录>/scripts/memcachedmultiport.py

c. 增加监控时devices->des && ip->host template选择memcachedmultiport->Downed Device Detection选择none->SNMP Version选择not in use->create graphs->Port to query for memcached statistics填写memcached端口。

3）也可以自定义nagios、cacti监控，通过memcached命令stats取相关数据。