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开源软件名称（OpenSource Name）：fluent/fluentd-kubernetes-daemonset开源软件地址(OpenSource Url)：https://github.com/fluent/fluentd-kubernetes-daemonset开源编程语言(OpenSource Language)：Ruby 62.5%开源软件介绍(OpenSource Introduction)：Fluentd Daemonset for Kubernetes
Supported tags and respective
|
| Series | Description |
|---|---|
| v1.x | current stable |
| v0.12 | Old stable, no longer updated |
Default YAML uses latest v1 images like fluent/fluentd-kubernetes-daemonset:v1-debian-kafka. If you want to avoid unexpected image update, specify exact version for image like fluent/fluentd-kubernetes-daemonset:v1.8.0-debian-kafka-1.0.
This is for v0.12 images.
In Kubernetes and default setting, fluentd needs root permission to read logs in /var/log and write pos_file to /var/log.
To avoid permission error, you need to set FLUENT_UID environment variable to 0 in your Kubernetes configuration.
These images have default configuration and support some environment variables for parameters but it sometimes doesn't fit your case. If you want to use your configuration, use ConfigMap feature.
Each image has following configurations:
tail input for log files and kubernetes_metadata filter/var/log/containers/*.log. See also "Use CRI parser for containerd/cri-o" logs sectionOverwrite conf file via ConfigMap. See also several examples:
This feature is available since v1.12.0-xxx-1.1.
By default, these images use json parser for /var/log/containers/ files because docker generates json formatted logs.
On the other hand, containerd/cri-o use different log format. To parse such logs, you need to use cri parser instead.
You can use cri parser by overwriting tail_container_parse.conf via ConfigMap.
# configuration example
<parse>
@type cri
</parse>
See also CRI parser README
You can update the default path for the container logs i.e /var/log/container/*.log and also one can add multiple path as defined in this fluentd document https://docs.fluentd.org/input/tail#path
Since v1.9.3 or later images.
You can exclude container logs from /var/log/containers/ with FLUENT_CONTAINER_TAIL_EXCLUDE_PATH.
If you have a trouble with specific log, use this envvar, e.g. ["/var/log/containers/logname-*"].
exclude_path parameter document: https://docs.fluentd.org/input/tail#exclude_pathIf you don't setup systemd in the container, fluentd shows following messages by default configuration.
[warn]: #0 [in_systemd_bootkube] Systemd::JournalError: No such file or directory retrying in 1s
[warn]: #0 [in_systemd_kubelet] Systemd::JournalError: No such file or directory retrying in 1s
[warn]: #0 [in_systemd_docker] Systemd::JournalError: No such file or directory retrying in 1s
You can suppress these messages by setting disable to FLUENTD_SYSTEMD_CONF environment variable in your kubernetes configuration.
By default, latest images launch prometheus plugins to monitor fluentd.
You can disable prometheus input plugin by setting disable to FLUENTD_PROMETHEUS_CONF environment variable in your kubernetes configuration.
This is for older images. Latest elasticsearch images don't use sed.
By historical reason, elasaticsearch image executes sed command during startup phase when FLUENT_ELASTICSEARCH_USER or FLUENT_ELASTICSEARCH_PASSWORD is specified. This sometimes causes a problem with read only mount.
To avoid this problem, set "true" to FLUENT_ELASTICSEARCH_SED_DISABLE environment variable in your kubernetes configuration.
This daemonset setting mounts /var/log as service account fluentd so you need to run containers as privileged container.
Here is command example:
oc project kube-system
oc create -f https://raw.githubusercontent.com/fluent/fluentd-kubernetes-daemonset/master/fluentd-daemonset-elasticsearch-rbac.yaml
oc adm policy add-scc-to-user privileged -z fluentd
oc patch ds fluentd -p "spec:
template:
spec:
containers:
- name: fluentd
securityContext:
privileged: true"
oc delete pod -l k8s-app=fluentd-logging
This is from nekop's japanese article.
zookeeper gem doesn't work on Debian 10, so kafka image doesn't include zookeeper gem.
Maintainers don't have k8s experience on Windows. Some users create k8s daemonset on Windows:
Please check them out.
Using debian-kafka2/debian-kafka2-arm64 images are better than using debian-kafka/debian-kafka-arm64 images.
Because debian-kafka2/debian-kafka2-arm64 images use out_kafka2 plugin but debian-kafka/debian-kafka-arm64 images use deprecated out_kafka_buffered plugin.
Some images are contributed by users. If you have a problem/question for following images, ask it to contributors.
Currently, we don't accept new destination request without contribution. See #293
Kubernetes Logging with Fluentd
We can't notice comments in the DockerHub so don't use them for reporting issues or asking question.
If you have any problems with or questions about this image, please contact us through a GitHub issue.
Update templates files instead of docker-image files.
docker-image files are automatically generated from templates.
Note: This file is generated from templates/README.md.erb
2023-10-27
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