Redis Sentinel
Pack Assets
Templates
The Centreon Pack Redis Sentinel brings 1 host template:
- App-Redis-Sentinel-custom
It brings the following Service Templates:
| Service Alias | Service Template | Default | Discovery |
|---|---|---|---|
| Redis-Clusters | App-Redis-Sentinel-Redis-Clusters | X | X |
| Sentinel-Clusters | App-Redis-Sentinel-Sentinel-Clusters | X | X |
Discovery rules
| Rule name | Description |
|---|---|
| App-Redis-Sentinel-Redis-Cluster-Name | Discover clusters and monitor redis utilization |
| App-Redis-Sentinel-Sentinel-Cluster-Name | Discover clusters and monitor sentinel utilization |
Collected metrics & status
- Redis-Clusters
- Sentinel-Clusters
| Metric name | Description | Unit |
|---|---|---|
| cluster.redis.slaves.detected.count | Number of detected slaves | |
| cluster.redis.subjectively_down.count | Number of subjectively down redis instances | |
| cluster.redis.objectively_down.count | Number of objectively down redis instances | |
| cluster.redis.slave_replication_offset.stddev.count | Slave replication offset standard deviation (between all slaves) | |
| status | Status of redis instance | |
| cluster_name~redis_address:redis_port#cluster.redis.ping_ok.latency.milliseconds | Last ok ping latency | ms |
| Metric name | Description | Unit |
|---|---|---|
| cluster.sentinels.slaves.detected.count | Number of detected sentinels | |
| cluster.sentinels.subjectively_down.count | Number of subjectively down sentinel instances | |
| cluster.sentinels.objectively_down.count | Number of objectively down sentinel instances | |
| quorum status | Status of sentinel voted quorum | |
| status | Status of sentinel instance | |
| cluster_name~sentinel_address:sentinel_port#cluster.sentinel.ping_ok.latency.milliseconds | Last ok ping latency | ms |
Prerequisites
To control your Redis Sentinel, the Poller should be able to perform redis-cli requests over the TCP/26379 port (by default).
The following commands are used:
- sentinel ckquorum <cluster_name>
- sentinel masters
- sentinel replicas <cluster_name>
- sentinel sentinels <cluster_name>
Setup
- Online License
- Offline License
- Install the Centreon package on every Centreon poller expected to monitor Redis Sentinel resources:
yum install centreon-plugin-Applications-Redis-Sentinel
- On the Centreon Web interface, install the Redis Sentinel Centreon Pack on the Configuration > Monitoring Connector Manager page.
- Install the Centreon package on every Centreon poller expected to monitor Redis Sentinel resources:
yum install centreon-plugin-Applications-Redis-Sentinel
Install the Redis Sentinel Centreon Pack RPM on the Centreon Central server:
yum install centreon-pack-applications-redis-sentinel
3. On the Centreon Web interface, install the **Redis Sentinel** Centreon Pack on the **Configuration > Monitoring Connector Manager** page.
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</Tabs>
## Configuration
### Host
* Log into Centreon and add a new Host through **Configuration > Hosts**
* Fill the **Name**, **Alias** & **IP Address / DNS** fields according to your **Redis Sentinel** server settings
* Select the *applications-redis-sentinel-custom* template to apply to the Host
* Once the template is applied, fill in the corresponding macros. Some macros are mandatory.
| Mandatory | Name | Description |
|:----------|:-----------------|:-----------------------------------------------------------------------------|
| | SENTINELPORT | (Default: '26379') |
| | SENTINELUSERNAME | Sentinel username (redis-cli >= 6.x mandatory) |
| | SENTINELPASSWORD | Sentinel password |
| | EXTRAOPTIONS | Any extra option you may want to add to the command (eg. a --tls --insecure) |
## How to install redis-cli 6.x ?
To support TLS and/or ACL users, you need **redis-cli** >= 6.x.
<Tabs groupId="sync">
<TabItem value="Centos 7" label="Centos 7">
```bash
yum install epel-release
yum install http://rpms.remirepo.net/enterprise/remi-release-7.rpm
yum --enablerepo=remi install redis
How to check in the CLI that the configuration is OK and what are the main options for?
Once the plugin is installed, log into your Centreon Poller CLI using the centreon-engine user account and test the Plugin by running the following command:
/usr/lib/centreon/plugins/centreon_redis_sentinel.pl \
--plugin=apps::redis::sentinel::plugin \
--server='10.0.0.1' \
--port='26379' \
--mode=redis-clusters \
--filter-cluster-name='' \
--verbose
The expected command output is shown below:
OK: cluster 'mymaster' number of detected slaves: 2, subjectively down instances: 0, objectively down instances: 0 - slave replication offset standard deviation: 843.00 - All redis instances are ok | 'mymaster#cluster.redis.slaves.detected.count'=2;;;0; 'mymaster#cluster.redis.subjectively_down.count'=0;;;0; 'mymaster#cluster.redis.objectively_down.count'=0;;;0; 'cluster.redis.slave_replication_offset.stddev.count'=843.00;;;; 'mymaster~10.25.52.107:6379#cluster.redis.ping_ok.latency.milliseconds'=1024s;;;0; 'mymaster~10.25.52.90:6379#cluster.redis.ping_ok.latency.milliseconds'=185s;;;0; 'mymaster~10.25.52.98:6379#cluster.redis.ping_ok.latency.milliseconds'=355s;;;0;
checking cluster 'mymaster'
number of detected slaves: 2, subjectively down instances: 0, objectively down instances: 0
slave replication offset standard deviation: 843.00
instance '10.25.52.107:6379' status: master [role: master], last ok ping: 1024 ms
instance '10.25.52.90:6379' status: slave [role: slave], last ok ping: 185 ms
instance '10.25.52.98:6379' status: slave [role: slave], last ok ping: 355 ms
All available options for a given mode can be displayed by adding the
--help parameter to the command:
/usr/lib/centreon/plugins/centreon_redis_sentinel.pl \
--plugin=apps::redis::sentinel::plugin \
--mode=redis-clusters \
--help
All available options for a given mode can be displayed by adding the
--list-mode parameter to the command:
/usr/lib/centreon/plugins/centreon_redis_sentinel.pl \
--plugin=apps::redis::sentinel::plugin \
--list-mode
Troubleshooting
Please find all the troubleshooting documentation for the Centreon Plugins in the dedicated page