Log
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You can check various logs related to Kubernetes. The monitoring categories provided by WhaTap Kubernetes are as follows:
Category | Description |
---|---|
#K8sEvent |
|
#WhatapEvent |
|
containerStdout |
|
AppLog |
|
Depending on the settings, duplicate log contents may be stored. Be sure to check for duplicates.
Setting the containerStdOut log filter
Home > Select Project > Management > Agent CONF.
The following guides you to filtering options to select information needed in the Kubernetes logs. You can set which logs to allow or exclude through filtering. In Agent CONF., select Direct Input in the Write options manner.
Log naming conventions
The Kubernetes containerStdOut logs are generated under the /var/log/containers/ path on the node. They keep the following naming conventions.
<podName>_<namespace>_<containerName>-<containerId>.log
Log filtering options
-
log_filter_enabled bool
Default
false
It sets whether to use log filters.
-
log_fillter_allow_list list
It sets the list of logs to allow. It indicates the items to be included for filtering.
-
log_fillter_deny_list list
It sets the list of logs to exclude. It indicates the items to be excluded for filtering.
Log filtering operation
Log filters work only when the log_filter_enabled
option is active. You can selectively collect logs via log_fillter_allow_list
and log_fillter_deny_list
when the value of the option is set to true
.
Log filters work on a blacklist basis. For example, if you enable log_filter_enabled
and do not set any items to add to the log_filter_allow_list
option, log collection for all containers is blocked by default.
Additionally, in the log filters, deny rules take precedence over allow rules. If the same items are set in both allow and deny rules, the deny rule takes precedence and logs are not collected.
Log filter example
Collecting logs for a single namespace
- Allow log_filter_allow_list
*_infra_*
All containers that exist in the infra
namespace are targeted for collection.
Collecting multiple namespace logs
- Allow log_filter_allow_list
*_infra_*, *_monitoring_*
All containers that exist in the infra
and monitoring
namespaces are specified as collection targets.
Pods containing specific terms are excluded.
-
Allow log_filter_allow_list
*_*_*
-
Deny log_filter_deny_list
*prod*_*_*
All containers are targeted for collection, but the logs that contain prod
in podName
are excluded.
Pods containing specific terms are collected.
- Allow log_filter_allow_list
*prod*_*_*
Only the logs that contain prod
in podName
are collected.
Multi-namespace logs are collected and Pods containing specific terms are excluded.
-
Allow log_filter_allow_list
*_infra_*, *_monitoring_*
-
Deny log_filter_deny_list
*prod*_*_*
The logs for the infra
and monitoring
namespaces are collected, and the logs that contain prod
in podName
are excluded.
The container logs that start with a specific term in the container name are excluded.
- Allow log_filter_allow_list
*_*_db-*
The container logs whose containerName
starts with db
in all namespaces are excluded.
Live Tail
Home > Select Project > Log > Live Tail
You can check the content in the WhaTap Kubernetes monitoring category in real time. For more information about Live Tail, see the following.
Log Trend
Home > Select Project > Log > Log Trend
You can see the stored log trend by setting a time range. For more information about Log Trend, see the following.
Log Search
Home > Select Project > Log > Log Search
You can search the stored logs by setting a time range. For example, you can see the standard out logs of a specific container or all containers in the deployment at once. You can also highlight a specific keyword for display.
For more information about Log Trend, see the following.
Setting the log
Home > Select Project > Log > Setting
You can configure various log-related settings including log activation. For more information about the log settings, see the following.