在日志模式中给出要从中抓取数据的多个容器名称

Question

我已经在K8s集群中设置了EFK堆栈。当前fluentd是抓取所有容器的日志。

我希望它只从容器A,B,C和D刮日志。

如果我有一些前缀如A-app，我可以这样做:

"fluentd-inputs.conf": "# HTTP input for the liveness and readiness probes
<source>
@type http
port 9880
</source>
# Get the logs from the containers running in the node
<source>
@type tail
path /var/log/containers/*-app.log // what can I put here for multiple different containers
# exclude Fluentd logs
exclude_path /var/log/containers/*fluentd*.log
pos_file /opt/bitnami/fluentd/logs/buffers/fluentd-docker.pos
tag kubernetes.*
read_from_head true
<parse>
@type json
</parse>
</source>
# enrich with kubernetes metadata
<filter kubernetes.**>
@type kubernetes_metadata
</filter>

Answer 1

只从特定的pod中抓取日志，您可以使用:

path /var/log/containers/POD_NAME_1*.log,/var/log/containers/POD_NAME_2*.log,.....,/var/log/containers/POD_NAME_N*.log

要从特定pod中的特定容器中抓取日志，您可以使用:

path /var/log/containers/POD_NAME_1*CONTAINER_NAME*.log,/var/log/containers/POD_NAME_2*CONTAINER_NAME*.log,.....,/var/log/containers/POD_NAME_N*CONTAINER_NAME*.log

---

我创建了一个简单的例子来说明它是如何工作的。

要从app-1Pod中抓取web-1容器的日志，并从app-2Pod中抓取所有容器的日志，您可以使用:

path /var/log/containers/app-1*web-1*.log,/var/log/containers/app-2*.log

$ kubectl logs -f fluentd-htwn5
...
2021-08-20 13:37:44 +0000 [info]: #0 starting fluentd worker pid=18 ppid=7 worker=0
2021-08-20 13:37:44 +0000 [info]: #0 [in_tail_container_logs] following tail of /var/log/containers/app-1_default_web-1-ae672aa1405b91701d130da34c54ab3106a8fc4901897ebbf574d03d5ca64eb8.log
2021-08-20 13:37:44 +0000 [info]: #0 [in_tail_container_logs] following tail of /var/log/containers/app-2-64c99b9f5b-tm6ck_default_nginx-cd1bd7617f04000a8dcfc1ccd01183eafbce9d0155578d8818b27427a4062968.log
2021-08-20 13:37:44 +0000 [info]: #0 [in_tail_container_logs] following tail of /var/log/containers/app-2-64c99b9f5b-tm6ck_default_frontend-1-e83acc9e7fc21d8e3c8a733e10063f44899f98078233b3238d6b3dc0903db560.log
2021-08-20 13:37:44 +0000 [info]: #0 fluentd worker is now running worker=0
...