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Memcached

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Memcached 采集器可以从 Memcached 实例中采集实例运行状态指标，并将指标采集到观测云，帮助监控分析 Memcached 各种异常情况。

前置条件

  • Memcached 版本 >= 1.5.0

配置

进入 DataKit 安装目录下的 conf.d/db 目录，复制 memcached.conf.sample 并命名为 memcached.conf。示例如下：

[[inputs.memcached]]
  ## 服务器地址，可支持多个
  servers = ["localhost:11211"]
  # unix_sockets = ["/var/run/memcached.sock"]

  ## 采集间隔
  # 单位 "ns", "us" (or "µs"), "ms", "s", "m", "h"
  interval = "10s"

[inputs.memcached.tags]
  # some_tag = "some_value"
  # more_tag = "some_other_value"
  # ...

配置好后，重启 DataKit 即可。

目前可以通过 ConfigMap 方式注入采集器配置来开启采集器。

指标集

以下所有数据采集，默认会追加名为 host 的全局 tag（tag 值为 DataKit 所在主机名），也可以在配置中通过 [inputs.memcached.tags] 指定其它标签：

 [inputs.memcached.tags]
  # some_tag = "some_value"
  # more_tag = "some_other_value"
  # ...

memcached

  • 标签
标签名 描述
server The host name from which metrics are gathered
  • 指标列表
指标 描述 数据类型 单位
accepting_conns Whether or not server is accepting conns int count
auth_cmds Number of authentication commands handled, success or failure int count
auth_errors Number of failed authentications int count
bytes Current number of bytes used to store items int B
bytes_read Total number of bytes read by this server from network int B
bytes_written Total number of bytes sent by this server to network int B
cas_badval Number of CAS reqs for which a key was found, but the CAS value did not match int count
cas_hits Number of successful CAS reqs int count
cas_misses Number of CAS reqs against missing keys int count
cmd_flush Cumulative number of flush reqs int count
cmd_get Cumulative number of retrieval reqs int count
cmd_set Cumulative number of storage reqs int count
cmd_touch Cumulative number of touch reqs int count
conn_yields Number of times any connection yielded to another due to hitting the -R limit int count
connection_structures Number of connection structures allocated by the server int count
curr_connections Number of open connections int count
curr_items Current number of items stored int count
decr_hits Number of successful decr reqs int count
decr_misses Number of decr reqs against missing keys int count
delete_hits Number of deletion reqs resulting in an item being removed int count
delete_misses umber of deletions reqs for missing keys int count
evicted_unfetched Items evicted from LRU that were never touched by get/incr/append/etc int count
evictions Number of valid items removed from cache to free memory for new items int count
expired_unfetched Items pulled from LRU that were never touched by get/incr/append/etc before expiring int count
get_hits Number of keys that have been requested and found present int count
get_misses Number of items that have been requested and not found int count
hash_bytes Bytes currently used by hash tables int B
hash_is_expanding Indicates if the hash table is being grown to a new size int count
hash_power_level Current size multiplier for hash table int count
incr_hits Number of successful incr reqs int count
incr_misses Number of incr reqs against missing keys int count
limit_maxbytes Number of bytes this server is allowed to use for storage int B
listen_disabled_num Number of times server has stopped accepting new connections (maxconns) int count
reclaimed Number of times an entry was stored using memory from an expired entry int count
threads Number of worker threads requested int count
total_connections Total number of connections opened since the server started running int count
total_items Total number of items stored since the server started int count
touch_hits Number of keys that have been touched with a new expiration time int count
touch_misses Number of items that have been touched and not found int count
uptime Number of secs since the server started int count