Source: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/app/memcached?at=release/7.0
Memcached by Zabbix agent 2
Overview
This template is designed for the effortless deployment of Memcached monitoring by Zabbix via Zabbix agent 2 and doesn't require any external scripts.
Requirements
Zabbix version: 7.0 and higher.
Tested versions
This template has been tested on:
- Memcached 1.4, 1.5, 1.6
Configuration
Zabbix should be configured according to the instructions in the Templates out of the box section.
Setup
Setup and configure zabbix-agent2 compiled with the Memcached monitoring plugin.
Test availability: zabbix_get -s memcached-host -k memcached.ping
Macros used
Name | Description | Default |
---|---|---|
{$MEMCACHED.CONN.URI} | Connection string in the URI format (password is not used). This param overwrites a value configured in the "Plugins.Memcached.Uri" option of the configuration file (if it's set), otherwise, the plugin's default value is used: "tcp://localhost:11211" |
tcp://localhost:11211 |
{$MEMCACHED.CONN.THROTTLED.MAX.WARN} | Maximum number of throttled connections per second |
1 |
{$MEMCACHED.CONN.QUEUED.MAX.WARN} | Maximum number of queued connections per second |
1 |
{$MEMCACHED.CONN.PRC.MAX.WARN} | Maximum percentage of connected clients |
80 |
{$MEMCACHED.MEM.PUSED.MAX.WARN} | Maximum percentage of memory used |
90 |
Items
Name | Description | Type | Key and additional info |
---|---|---|---|
Get status | Zabbix agent | memcached.stats["{$MEMCACHED.CONN.URI}"] | |
Ping | Zabbix agent | memcached.ping["{$MEMCACHED.CONN.URI}"] Preprocessing
|
|
Max connections | Max number of concurrent connections |
Dependent item | memcached.connections.max Preprocessing
|
Maximum number of bytes | Maximum number of bytes allowed in cache. You can adjust this setting via a config file or the command line while starting your Memcached server. |
Dependent item | memcached.config.limit_maxbytes Preprocessing
|
CPU sys | System CPU consumed by the Memcached server |
Dependent item | memcached.cpu.sys Preprocessing
|
CPU user | User CPU consumed by the Memcached server |
Dependent item | memcached.cpu.user Preprocessing
|
Queued connections per second | Number of times that memcached has hit its connections limit and disabled its listener |
Dependent item | memcached.connections.queued.rate Preprocessing
|
New connections per second | Number of connections opened per second |
Dependent item | memcached.connections.rate Preprocessing
|
Throttled connections | Number of times a client connection was throttled. When sending GETs in batch mode and the connection contains too many requests (limited by -R parameter) the connection might be throttled to prevent starvation. |
Dependent item | memcached.connections.throttled.rate Preprocessing
|
Connection structures | Number of connection structures allocated by the server |
Dependent item | memcached.connections.structures Preprocessing
|
Open connections | The number of clients presently connected |
Dependent item | memcached.connections.current Preprocessing
|
Commands: FLUSH per second | The flush_all command invalidates all items in the database. This operation incurs a performance penalty and shouldn't take place in production, so check your debug scripts. |
Dependent item | memcached.commands.flush.rate Preprocessing
|
Commands: GET per second | Number of GET requests received by server per second. |
Dependent item | memcached.commands.get.rate Preprocessing
|
Commands: SET per second | Number of SET requests received by server per second. |
Dependent item | memcached.commands.set.rate Preprocessing
|
Process id | PID of the server process |
Dependent item | memcached.process_id Preprocessing
|
Memcached version | Version of the Memcached server |
Dependent item | memcached.version Preprocessing
|
Uptime | Number of seconds since Memcached server start |
Dependent item | memcached.uptime Preprocessing
|
Bytes used | Current number of bytes used to store items. |
Dependent item | memcached.stats.bytes Preprocessing
|
Written bytes per second | The network's read rate per second in B/sec |
Dependent item | memcached.stats.bytes_written.rate Preprocessing
|
Read bytes per second | The network's read rate per second in B/sec |
Dependent item | memcached.stats.bytes_read.rate Preprocessing
|
Hits per second | Number of successful GET requests (items requested and found) per second. |
Dependent item | memcached.stats.hits.rate Preprocessing
|
Misses per second | Number of missed GET requests (items requested but not found) per second. |
Dependent item | memcached.stats.misses.rate Preprocessing
|
Evictions per second | "An eviction is when an item that still has time to live is removed from the cache because a brand new item needs to be allocated. The item is selected with a pseudo-LRU mechanism. A high number of evictions coupled with a low hit rate means your application is setting a large number of keys that are never used again." |
Dependent item | memcached.stats.evictions.rate Preprocessing
|
New items per second | Number of new items stored per second. |
Dependent item | memcached.stats.total_items.rate Preprocessing
|
Current number of items stored | Current number of items stored by this instance. |
Dependent item | memcached.stats.curr_items Preprocessing
|
Threads | Number of worker threads requested |
Dependent item | memcached.stats.threads Preprocessing
|
Triggers
Name | Description | Expression | Severity | Dependencies and additional info |
---|---|---|---|---|
Memcached: Service is down | last(/Memcached by Zabbix agent 2/memcached.ping["{$MEMCACHED.CONN.URI}"])=0 |
Average | Manual close: Yes | |
Memcached: Failed to fetch info data | Zabbix has not received any data for items for the last 30 minutes. |
nodata(/Memcached by Zabbix agent 2/memcached.cpu.sys,30m)=1 |
Warning | Manual close: Yes Depends on:
|
Memcached: Too many queued connections | The max number of connections is reached and a new connection had to wait in the queue as a result. |
min(/Memcached by Zabbix agent 2/memcached.connections.queued.rate,5m)>{$MEMCACHED.CONN.QUEUED.MAX.WARN} |
Warning | |
Memcached: Too many throttled connections | Number of times a client connection was throttled is too high. |
min(/Memcached by Zabbix agent 2/memcached.connections.throttled.rate,5m)>{$MEMCACHED.CONN.THROTTLED.MAX.WARN} |
Warning | |
Memcached: Total number of connected clients is too high | When the number of connections reaches the value of the "max_connections" parameter, new connections will be rejected. |
min(/Memcached by Zabbix agent 2/memcached.connections.current,5m)/last(/Memcached by Zabbix agent 2/memcached.connections.max)*100>{$MEMCACHED.CONN.PRC.MAX.WARN} |
Warning | |
Memcached: Version has changed | The Memcached version has changed. Acknowledge to close the problem manually. |
last(/Memcached by Zabbix agent 2/memcached.version,#1)<>last(/Memcached by Zabbix agent 2/memcached.version,#2) and length(last(/Memcached by Zabbix agent 2/memcached.version))>0 |
Info | Manual close: Yes |
Memcached: has been restarted | Uptime is less than 10 minutes. |
last(/Memcached by Zabbix agent 2/memcached.uptime)<10m |
Info | Manual close: Yes |
Memcached: Memory usage is too high | min(/Memcached by Zabbix agent 2/memcached.stats.bytes,5m)/last(/Memcached by Zabbix agent 2/memcached.config.limit_maxbytes)*100>{$MEMCACHED.MEM.PUSED.MAX.WARN} |
Warning |
Feedback
Please report any issues with the template at https://support.zabbix.com
You can also provide feedback, discuss the template, or ask for help at ZABBIX forums