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
- On the Centreon Web interface, install the Redis Sentinel Centreon Pack on the Configuration > Monitoring Connector Manager page.
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.
- Centos 7
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