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Redis - Classic Collector

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Redis is an in-memory data structure implementing a distributed, in-memory key-value database with optional durability.

The Sumo Logic app for Redis helps you monitor the state of the database cluster. The preconfigured dashboards provide information about cluster status, resource usage, commands running, and cache hit rate. You can easily determine the health of the cluster by just a glance at the dashboards.

Log and Metrics types​

This Sumo Logic app for Redis supports Metrics and Logs for Redis in Cluster or Standalone mode. The Redis logs are generated in files as configured in the cluster node configuration files in /etc/redis/redis.conf. For more details on Redis logs, click here.

The app supports metrics generated by the Redis plugin for Telegraf and assumes prometheus format metrics.

Sample log messages​

{
  "timestamp": 1615988485842,
  "log": "1:M 17 Mar 2021 13:41:19.103 * Synchronization with replica 100.96.3.30:6379 succeeded",
  "stream": "stdout",
  "time": "2021-03-17T13:41:19.103646109Z"
}

Sample queries​

This sample Query is from the the Redis - Logs dashboard > Logs panel.

Query String
<Redis_DB_Cluster_Filter> component="database" and db_system="redis"
| json auto maxdepth 1 nodrop
| if (isEmpty(log), _raw, log) as message
| count by message
| limit 100
| fields message

Collecting logs and metrics for Redis​

This section provides instructions for configuring log and metric collection for the Sumo Logic app for Redis. Configuring log and metric collection for the Redis ULM app includes the following tasks:

Step 1: Configure Fields in Sumo Logic​

Create the following Fields in Sumo Logic prior to configuring collection. This ensures that your logs and metrics are tagged with relevant metadata, which is required by the app dashboards. For information on setting up fields, see Sumo Logic Fields.

note

This step is not needed if you are using the application components solution terraform script.

If you're using Redis in a Kubernetes environment, create the fields:

  • pod_labels_component
  • pod_labels_environment
  • pod_labels_db_system
  • pod_labels_db_cluster
  • pod_labels_db_cluster_address
  • pod_labels_db_cluster_port

Step 2: Configure Collection for Redis​

Sumo Logic supports collection of logs and metrics data from Redis in both Kubernetes and non-Kubernetes environments. Click on the appropriate tab below based on the environment where your Redis clusters are hosted.

In Kubernetes environments, we use the Telegraf Operator, which is packaged with our Kubernetes collection. You can learn more about it here.The diagram below illustrates how data is collected from Redis in Kubernetes environments. In the architecture shown below, there are four services that make up the metric collection pipeline: Telegraf, Telegraf Operator, Prometheus, and Sumo Logic Distribution for OpenTelemetry Collector.


redis-flow

The first service in the metrics pipeline is Telegraf. Telegraf collects metrics from Redis. Note that we’re running Telegraf in each pod we want to collect metrics from as a sidecar deployment: that is, Telegraf runs in the same pod as the containers it monitors. Telegraf uses the Redis input plugin to obtain metrics. (For simplicity, the diagram doesn’t show the input plugins.) The injection of the Telegraf sidecar container is done by the Telegraf Operator. Prometheus pulls metrics from Telegraf and sends them to Sumo Logic Distribution for OpenTelemetry Collector which enriches metadata and sends metrics to Sumo Logic.

In the logs pipeline, Sumo Logic Distribution for OpenTelemetry Collector collects logs written to standard out and forwards them to another instance of Sumo Logic Distribution for OpenTelemetry Collector, which enriches metadata and sends logs to Sumo Logic.

Configure Metrics Collection​

prerequisites

Ensure that you are monitoring your Kubernetes clusters with the Telegraf operator. If you are not, then follow these instructions to do so.

  1. To collect metrics from a Kubernetes environment, add the following annotations on your Redis pods:
 annotations:
    telegraf.influxdata.com/class: sumologic-prometheus
    prometheus.io/scrape: "true"
    prometheus.io/port: "9273"
    telegraf.influxdata.com/inputs: |+
    servers = ["tcp://:<username-CHANGEME>:<password-CHANGEME>@localhost:6379"]
  [inputs.redis.tags]
    environment: "ENV_TO_BE_CHANGED"
    component="database"
    db_system="redis"
    db_cluster: "ENV_TO_BE_CHANGED"
    db_cluster_address = "ENV_TO_BE_CHANGED"
    db_cluster_port = "ENV_TO_BE_CHANGED"

  1. Enter in values for the following parameters (marked ENV_TO_BE_CHANGED in the snippet above):

    • telegraf.influxdata.com/inputs. As telegraf will be run as a sidecar the host should always be localhost.
      • In the input plugins section i.e.:
        • servers. The URL to the Redis server. This can be a comma-separated list to connect to multiple Redis servers.
      • In the tags section, [inputs.redis.tags]:
        • environment. This is the deployment environment where the Redis cluster identified by the value of servers resides. For example: dev, prod or qa. While this value is optional we highly recommend setting it.
        • db_cluster. Enter a name to identify this Redis cluster. This cluster name will be shown in the Sumo Logic dashboards.
        • db_cluster_address. Enter the cluster hostname or ip address that is used by the application to connect to the database. It could also be the load balancer or proxy endpoint.
        • db_cluster_port. Enter the database port. If not provided, a default port will be used.
    note

    db_cluster_address and db_cluster_port should reflect the exact configuration of DB client configuration in your application, especially if you instrument it with OT tracing. The values of these fields should match exactly the connection string used by the database client (reported as values for net.peer.name and net.peer.port metadata fields).

    For example, if your application uses “redis-prod.sumologic.com:3306” as the connection string, the field values should be set as follows: db_cluster_address=redis-prod.sumologic.com db_cluster_port=3306

    If your application connects directly to a given redis node, rather than the whole cluster, use the application connection string to override the value of the “host” field in the Telegraf configuration: host=redis-prod.sumologic.com

    Pivoting to Tracing data from Entity Inspector is possible only for “Redis address” Entities.

    • Do not modify the following values, as they will cause the Sumo Logic apps to not function correctly.
      • telegraf.influxdata.com/class: sumologic-prometheus. This instructs the Telegraf operator what output to use. This should not be changed.
      • prometheus.io/scrape: "true". This ensures our Prometheus will scrape the metrics.
      • prometheus.io/port: "9273". This tells prometheus what ports to scrape on. This should not be changed.
      • telegraf.influxdata.com/inputs
        • In the tags section, that is [inputs.redis.tags]
        • component: "database". This value is used by Sumo Logic apps to identify application components.
        • db_system: "redis". This value identifies the database system.
    • See this doc for more parameters that can be configured in the Telegraf agent globally.
    • For more information on configuring the Redis input plugin for Telegraf, see this doc.

  2. Once this has been done, the Sumo Logic Kubernetes collection will automatically start collecting metrics from the pods having the labels and annotations defined in the previous step.

  3. Verify metrics in Sumo Logic by running the following metrics query:

db_cluster=<Your_Redis_Cluster_Name> component="database" \
and db_system="redis"

Configure Logs Collection​

This section explains the steps to collect Redis logs from a Kubernetes environment.

  1. Collect Redis logs written to standard output. If your Redis helm chart/pod is writing the logs to standard output, then follow the steps listed below.

    1. Apply the following labels to your Redis pods:
    environment: "ENV_TO_BE_CHANGED"
    component: "database"
    db_system: "redis"    
    db_cluster: "ENV_TO_BE_CHANGED"
    db_cluster_address = "ENV_TO_BE_CHANGED"
    db_cluster_port = "ENV_TO_BE_CHANGED"
    1. Enter in values for the following parameters (marked ENV_TO_BE_CHANGED above):
      • environment. This is the deployment environment where the Redis cluster identified by the value of servers resides. For example: dev, prod or qa. While this value is optional we highly recommend setting it.
      • db_cluster. Enter a name to identify this Redis cluster. This cluster name will be shown in the Sumo Logic dashboards.
      • db_cluster_address. Enter the cluster hostname or ip address that is used by the application to connect to the database. It could also be the load balancer or proxy endpoint.
      • db_cluster_port. Enter the database port. If not provided, a default port will be used.
    note

    db_cluster_address and db_cluster_port should reflect the exact configuration of DB client configuration in your application, especially if you instrument it with OT tracing. The values of these fields should match exactly the connection string used by the database client (reported as values for the net.peer.name and net.peer.port metadata fields).

    For example, if your application uses “redis-prod.sumologic.com:3306” as the connection string, the field values should be set as follows: db_cluster_address=redis-prod.sumologic.com db_cluster_port=3306

    If your application connects directly to a given Redis node, rather than the whole cluster, use the application connection string to override the value of the “host” field in the Telegraf configuration: host=redis-prod.sumologic.com

    Pivoting to Tracing data from Entity Inspector is possible only for “Redis address” Entities.

    • Do not modify these values as they will cause the Sumo Logic apps to not function correctly.
      • component: “database”. This value is used by Sumo Logic apps to identify application components.
      • db_system: “redis”. This value identifies the database system.
    • For all other parameters, see this doc for more parameters that can be configured in the Telegraf agent globally.
    1. The Sumologic-Kubernetes-Collection will automatically capture the logs from stdout and will send the logs to Sumologic. For more information on deploying Sumologic-Kubernetes-Collection, see this page.

  2. Collect Redis logs written to log files (Optional). If your Redis helm chart/pod is writing its logs to log files, you can use a sidecar to send log files to standard out. To do this:

    1. Determine the location of the Redis log file on Kubernetes. This can be determined from the redis.conf for your Redis cluster along with the mounts on the Redis pods.
    2. Install the Sumo Logic tailing sidecar operator.
    3. Add the following annotation in addition to the existing annotations.
    annotations:
      tailing-sidecar: sidecarconfig;<mount>:<path_of_redis_log_file>/<redis_log_file_name>

    Example:

    annotations:
      tailing-sidecar: sidecarconfig;data:/redis-master-data/redis.log
    1. Make sure that the Redis pods are running and annotations are applied by using the command:
    kubectl describe pod <redis_pod_name>
    1. Sumo Logic Kubernetes collection will automatically start collecting logs from the pods having the annotations defined above.

  3. Add an FER to normalize the fields in Kubernetes environments. This step is not needed if using application components solution terraform script. Labels created in Kubernetes environments automatically are prefixed with pod_labels. To normalize these for our app to work, we need to create a Field Extraction Rule. To do so:

    • Classic UI. In the main Sumo Logic menu, select Manage Data > Logs > Field Extraction Rules.
      New UI. In the top menu select Configuration, and then under Logs select Field Extraction Rules. You can also click the Go To... menu at the top of the screen and select Field Extraction Rules.
    • Click the + Add button on the top right of the table.
    • The Add Field Extraction Rule form will appear:
    • Enter the following options:
      • Rule Name. Enter the name as App Observability - Database.
      • Applied At. Choose Ingest Time.
        • Scope. Select Specific Data. Enter the following keyword search expression:
        pod_labels_environment=* pod_labels_component=database pod_labels_db_system=* pod_labels_db_cluster=*
        • Parse Expression. Enter the following parse expression:
        | if (!isEmpty(pod_labels_environment), pod_labels_environment, "") as environment
           | pod_labels_component as component
           | pod_labels_db_system as db_system
           | if (!isEmpty(pod_labels_db_cluster), pod_labels_db_cluster, null) as db_cluster
    • Click Save to create the rule.

Installing Redis Monitors/Alerts​

note

This step is not needed if you are using the application components solution terraform script.

This section has instructions for installing the Sumo app and Alerts for Redis ULM, as well as descriptions and examples for each of the dashboards. These instructions assume you have already set up collection as described in the Collecting Logs and Metrics for Redis app section.

Sumo Logic has provided out-of-the-box alerting capabilities available via Sumo Logic monitors to help you quickly determine if the Redis database cluster is available and performing as expected. These monitors fire alerts (notifications) on top of preset thresholds on metrics data using industry best practices and recommendations.

For details on the individual monitors, please see Alerts.

  • To install these alerts, you need to have the Manage Monitors role capability.
  • Alerts can be installed by either importing them via a JSON or via a Terraform script.
note

There are limits for how many alerts can be enabled - please see the Alerts FAQ for details.

Method A: Importing a JSON file​

  1. Download a JSON file that describes the monitors. The JSON contains the alerts that are based on Sumo Logic searches that do not have any scope filters and therefore will be applicable to all Redis clusters, the data for which has been collected via the instructions in the previous sections., However, if you would like to restrict these alerts to specific clusters or environments, update the JSON file by replacing the text db_system=redis with <Your Custom Filter> db_system=redis. Custom filter examples:
    • For alerts applicable only to a specific cluster, your custom filter would be: db_cluster=redis-.prod.01.
    • For alerts applicable to all clusters that start with redis-prod, your custom filter would be: db_cluster=redis-prod*.
    • For alerts applicable to a specific cluster within a production environment, your custom filter would be: db_cluster=redis-1 and environment=prod. This assumes you have set the optional environment tag while configuring collection.
  2. Classic UI. In the main Sumo Logic menu, select Manage Data > Monitoring > Monitors.
    New UI. In the main Sumo Logic menu, select Alerts > Monitors. You can also click the Go To... menu at the top of the screen and select Monitors.
  3. Click Add.
  4. Click Import to import monitors from the JSON above.
note

Monitors are disabled by default. Once you have installed the alerts via this method, navigate to the Redis folder under Monitors to configure them. See Monitor Settings to enable monitors. To send notifications to teams or connections, see the instructions detailed in Step 4 of Create a Monitor.

Method B: Using a Terraform script​

  1. Generate a Sumo Logic access key and ID for a user that has the Manage Monitors role capability in Sumo Logic using these instructions. Please identify which deployment your Sumo Logic account is in, using this link.
  2. Download and install Terraform 0.13 or later.
  3. Download the Sumo Logic Terraform package for Redis alerts. The alerts package is available in the Sumo Logic github repository. You can either download it via the “git clone” command or as a zip file.
  4. Monitor Configuration. After the package has been extracted, navigate to the package directory terraform-sumologic-sumo-logic-monitor/monitor_packages/redis/

Edit the redis.auto.tfvars file and add the Sumo Logic Access Key, Access Id and Deployment from Step 1.

access_id   = "<SUMOLOGIC ACCESS ID>"
access_key  = "<SUMOLOGIC ACCESS KEY>"
environment = "<SUMOLOGIC DEPLOYMENT>"

The Terraform script installs the alerts without any scope filters, if you would like to restrict the alerts to specific clusters or environments, update the variable redis_cluster_filter. Custom filter examples:

  • For alerts applicable only to a specific cluster, your custom filter would be: db_cluster=redis-.prod.01.
  • For alerts applicable to all clusters that start with redis-prod, your custom filter would be: db_cluster=redis-prod*.
  • For alerts applicable to a specific cluster within a production environment, your custom filter would be: db_cluster=redis-1 and environment=prod. This assumes you have set the optional environment tag while configuring collection.

All monitors are disabled by default on installation, if you would like to enable all the monitors, set the parameter monitors_disabled to false in this file.

By default, the monitors are configured in a monitor folder called “Redis”, if you would like to change the name of the folder, update the monitor folder name in this file.

If you would like the alerts to send email or connection notifications, configure these in the file redis_notifications.auto.tfvars. For configuration examples, refer to the next section.

  1. Email and Connection Notification Configuration Examples. To configure notifications, modify the file redis_notifications.auto.tfvars file and fill in the connection_notifications See the examples for PagerDuty and email notifications below. See this document for creating payloads with other connection types.
Pagerduty Connection Example
connection_notifications = [
    {
      connection_type       = "PagerDuty",
      connection_id         = "<CONNECTION_ID>",
      payload_override      = "{\"service_key\": \"your_pagerduty_api_integration_key\",\"event_type\": \"trigger\",\"description\": \"Alert: Triggered {{TriggerType}} for Monitor {{Name}}\",\"client\": \"Sumo Logic\",\"client_url\": \"{{QueryUrl}}\"}",
      run_for_trigger_types = ["Critical", "ResolvedCritical"]
    },
    {
      connection_type       = "Webhook",
      connection_id         = "<CONNECTION_ID>",
      payload_override      = "",
      run_for_trigger_types = ["Critical", "ResolvedCritical"]
    }
  ]

Replace <CONNECTION_ID> with the connection id of the webhook connection. The webhook connection id can be retrieved via calling the Monitors API.

For overriding payload for different connection types, refer to this document.

Email Notifications Example
email_notifications = [
    {
      connection_type       = "Email",
      recipients            = ["abc@example.com"],
      subject               = "Monitor Alert: {{TriggerType}} on {{Name}}",
      time_zone             = "PST",
      message_body          = "Triggered {{TriggerType}} Alert on {{Name}}: {{QueryURL}}",
      run_for_trigger_types = ["Critical", "ResolvedCritical"]
    }
  ]

  1. Install the Monitors.

    1. Navigate to the package directory terraform-sumologic-sumo-logic-monitor/monitor_packages/redis/ and run terraform init. This will initialize Terraform and will download the required components.
    2. Run terraform plan to view the monitors which will be created/modified by Terraform.
    3. Run terraform apply.

  2. Post Installation. If you haven’t enabled alerts and/or configured notifications via the Terraform procedure outlined above, we highly recommend enabling alerts of interest and configuring each enabled alert to send notifications to other people or services. This is detailed in Add a Monitor.

Installing the Redis app​

This section demonstrates how to install the Redis ULM app.

  1. From the App Catalog, search for and select the app.
  2. Select the version of the service you're using and click Add to Library.
note

Version selection is not available for all apps.

  1. To install the app, complete the following fields.
    1. App Name. You can retain the existing name, or enter a name of your choice for the app.
    2. Data Source. Choose Enter a Custom Data Filter and enter a custom Redis cluster filter. Examples:
      • For all Redis clusters: db_cluster=*
      • For a specific cluster: db_cluster=redis.dev.01
      • Clusters within a specific environment: db_cluster=redis-1 and environment=prod. (This assumes you have set the optional environment tag while configuring collection).
    3. Advanced. Select the Location in Library (the default is the Personal folder in the library), or click New Folder to add a new folder.
  2. Click Add to Library.

Once an app is installed, it will appear in your Personal folder, or other folder that you specified. From here, you can share it with your organization.

Panels will start to fill automatically. It's important to note that each panel slowly fills with data matching the time range query and received since the panel was created. Results won't immediately be available, but with a bit of time, you'll see full graphs and maps.

Viewing Redis dashboards​

Filter with template variables

Template variables provide dynamic dashboards that can rescope data on the fly. As you apply variables to troubleshoot through your dashboard, you view dynamic changes to the data for a quicker resolution to the root cause. You can use template variables to drill down and examine the data on a granular level. For more information, see Filter with template variables.

Overview​

The Redis - Overview dashboard provides an at-a-glance view of the Redis server status, error logs along with database metrics.

Use this dashboard to:

  • Gain insights into Redis cluster Master and Slave status.
  • Gain insights into your Redis health using Cache Hit Rate, Fragmentation Ratio, and Slow Queries Log.
  • Get insights into Active and rejected client connections.
Redis dashboards

Cluster Overview​

The Redis - Cluster Overview dashboard provides a high-level view of cluster infrastructure, comparisons, and trends.

Use this dashboard to:

  • Review Cluster infrastructure.
  • Manage Redis versions running on nodes.
  • Understand Master and Slave replication offsets.
Redis dashboards

Cluster Operations​

The Redis - Cluster Operations dashboard provides a high-level view of the activity and health of Master and Slaves on your network. Dashboard panels display visual graphs and detailed information on replication offsets, cache rate, and most importantly, resource usage.

Use this dashboard to:

  • To understand the Cluster resource usage.
  • Gain insights into cache hit and miss rates.
Redis dashboards

Logs​

The Redis - Logs dashboard provides a detailed analysis based on logs. The panels provide details such as RDBMemory Usage, events, RDB, and AOF events.

Use this dashboard to:

  • Review errors and warnings generated by the server.
  • Review the RDBMemory Usage, events, RDB and AOF events.
Redis dashboards

Command Stats Deltas​

The Redis - Command Stats Deltas dashboard provides an at-a-glance view of commands running on your Redis server.

Use this dashboard to:

  • To gain insights into the commands running on your cluster.
Redis dashboards

Redis Alerts​

Sumo Logic has provided out-of-the-box alerts available via Sumo Logic monitors to help you quickly determine if the Redis database cluster is available and performing as expected.

Alert Name Alert Description and conditions Alert Condition Recover Condition
Redis - Instance Down This alert fires when we detect that the Redis instance is down for 5 minutes. == 0 >0
Redis - Missing Master This alert fires when we detect that a Redis cluster has no node marked as master for 5 minutes. <=0 >0
Redis - Replication Broken This alert fires when we detect that a Redis instance has lost a slave. <0 >=0
Redis - Too Many Connections This alert fires when we detect a given Redis server has too many connections (over 100). >100 <=100
Redis - Rejected Connections This alert fires when we detect that some connections to a Redis cluster have been rejected. >0 <=0
Redis - High Memory Fragmentation Ratio This alert fires when the ratio of Redis memory usage to Linux virtual memory pages (mapped to physical memory chunks) is higher than 1.5.

A high ratio will lead to swapping and can adversely affect performance.

 >=1.5 <1.5
Redis - Potential Master-Slave Communication Failure This alert fires when we detect that communication between the Redis master and slave nodes has not occurred for the past 60 seconds or more. >=60 <60
Redis - Replica Lag This alert fires when we detect that the replica lag for a given Redis cluster is greater than 60 seconds. Please review how replication has been configured. >60 <=60
Redis - Replication Broken This alert fires when we detect that a Redis instance has lost all slaves. This will affect the redundancy of data stored in Redis. Please review how replication has been configured. <0 >=0
Redis - Replication Offset This alert fires when the replication offset in a given Redis cluster is greater than 1 MB for the last five minutes. Please review how replication has been configured. >=1 <1
Redis - Out of Memory This alert fires when we detect that a Redis node is running out of memory (> 90%). > 90% < 90%
Redis - High CPU Usage This alert is fired if user and system cpu usage for a host exceeds 80%. > 80% < 80%
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