有时候调试fluent-bit的配置，达到想要的输出效果，并不是件简单的事情，以下通过debug镜像调试fluent-bit采集kubernetes Pod的IP。
fluent-bit官方文档给出了用于调试的镜像：
https://docs.fluentbit.io/manual/installation/docker
dockerhub仓库链接为：
https://hub.docker.com/r/fluent/fluent-bit/
部署fluent-bit-debug
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app.kubernetes.io/name: fluent-bit-debug
name: fluent-bit-debug
namespace: kubesphere-logging-system
spec:
progressDeadlineSeconds: 600
replicas: 1
revisionHistoryLimit: 10
selector:
matchLabels:
app.kubernetes.io/name: fluent-bit-debug
strategy:
rollingUpdate:
maxSurge: 25%
maxUnavailable: 25%
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
app.kubernetes.io/name: fluent-bit-debug
name: fluent-bit-debug
spec:
containers:
- env:
- name: NODE_NAME
valueFrom:
fieldRef:
apiVersion: v1
fieldPath: spec.nodeName
command:
- /usr/local/bin/sh
- -c
- sleep 9999
image: fluent/fluent-bit:1.6.9-debug
imagePullPolicy: IfNotPresent
name: fluent-bit
ports:
- containerPort: 2020
name: metrics
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /var/lib/docker/containers
name: varlibcontainers
readOnly: true
- mountPath: /fluent-bit/config
name: config
readOnly: true
- mountPath: /var/log/
name: varlogs
readOnly: true
- mountPath: /var/log/journal
name: systemd
readOnly: true
- mountPath: /fluent-bit/tail
name: positions
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
serviceAccount: fluent-bit
serviceAccountName: fluent-bit
terminationGracePeriodSeconds: 30
volumes:
- hostPath:
path: /var/lib/docker/containers
type: ""
name: varlibcontainers
- name: config
secret:
defaultMode: 420
secretName: fluent-bit-debug-config
- hostPath:
path: /var/log
type: ""
name: varlogs
- hostPath:
path: /var/log/journal
type: ""
name: systemd
- emptyDir: {}
name: positions
用到的secret：fluent-bit-debug-config如下，包含两个key：
第一个parsers.conf：为空即可；配置细节可以参考官方文档：
Configuration File
第二个fluent-bit.conf配置需根据情况配置，以下主要在不同场景，给出fluent-bit.conf。也会涉及到kubesphere、Filter CRD一起使用。
fluent-bit使用
exec进入容器可以使用/fluent-bit/bin/fluent-bit调试：
/fluent-bit/bin # ./fluent-bit -h
Usage: fluent-bit [OPTION]
Available Options
-b --storage_path=PATH specify a storage buffering path
-c --config=FILE specify an optional configuration file
-d, --daemon run Fluent Bit in background mode
-f, --flush=SECONDS flush timeout in seconds (default: 5)
-F --filter=FILTER set a filter
-i, --input=INPUT set an input
-m, --match=MATCH set plugin match, same as '-p match=abc'
-o, --output=OUTPUT set an output
-p, --prop="A=B" set plugin configuration property
-R, --parser=FILE specify a parser configuration file
-e, --plugin=FILE load an external plugin (shared lib)
-l, --log_file=FILE write log info to a file
-t, --tag=TAG set plugin tag, same as '-p tag=abc'
-T, --sp-task=SQL define a stream processor task
-v, --verbose increase logging verbosity (default: info)
-H, --http enable monitoring HTTP server
-P, --port set HTTP server TCP port (default: 2020)
-s, --coro_stack_size Set coroutines stack size in bytes (default: 24576)
-q, --quiet quiet mode
-S, --sosreport support report for Enterprise customers
-V, --version show version number
-h, --help print this help
Inputs
cpu CPU Usage
mem Memory Usage
thermal Thermal
kmsg Kernel Log Buffer
proc Check Process health
disk Diskstats
systemd Systemd (Journal) reader
netif Network Interface Usage
docker Docker containers metrics
docker_events Docker events
tail Tail files
dummy Generate dummy data
head Head Input
health Check TCP server health
collectd collectd input plugin
statsd StatsD input plugin
serial Serial input
stdin Standard Input
syslog Syslog
exec Exec Input
tcp TCP
mqtt MQTT, listen for Publish messages
forward Fluentd in-forward
random Random
Filters
alter_size Alter incoming chunk size
aws Add AWS Metadata
record_modifier modify record
throttle Throttle messages using sliding window algorithm
kubernetes Filter to append Kubernetes metadata
modify modify records by applying rules
nest nest events by specified field values
parser Parse events
expect Validate expected keys and values
grep grep events by specified field values
rewrite_tag Rewrite records tags
lua Lua Scripting Filter
stdout Filter events to STDOUT
Outputs
azure Send events to Azure HTTP Event Collector
azure_blob Azure Blob Storage
bigquery Send events to BigQuery via streaming insert
counter Records counter
datadog Send events to DataDog HTTP Event Collector
es Elasticsearch
exit Exit after a number of flushes (test purposes)
file Generate log file
forward Forward (Fluentd protocol)
http HTTP Output
influxdb InfluxDB Time Series
logdna LogDNA
loki Loki
kafka Kafka
kafka-rest Kafka REST Proxy
nats NATS Server
nrlogs New Relic
null Throws away events
plot Generate data file for GNU Plot
pgsql PostgreSQL
slack Send events to a Slack channel
splunk Send events to Splunk HTTP Event Collector
stackdriver Send events to Google Stackdriver Logging
stdout Prints events to STDOUT
syslog Syslog
tcp TCP Output
td Treasure Data
flowcounter FlowCounter
gelf GELF Output
cloudwatch_logs Send logs to Amazon CloudWatch
kinesis_firehose Send logs to Amazon Kinesis Firehose
s3 Send to S3
Internal
Event Loop = epoll
Build Flags = FLB_HAVE_HTTP_CLIENT_DEBUG FLB_HAVE_PARSER FLB_HAVE_RECORD_ACCESSOR FLB_HAVE_STREAM_PROCESSOR JSMN_PARENT_LINKS JSMN_STRICT FLB_HAVE_TLS FLB_HAVE_AWS FLB_HAVE_SIGNV4 FLB_HAVE_SQLDB FLB_HAVE_METRICS FLB_HAVE_HTTP_SERVER FLB_HAVE_SYSTEMD FLB_HAVE_FORK FLB_HAVE_TIMESPEC_GET FLB_HAVE_GMTOFF FLB_HAVE_UNIX_SOCKET FLB_HAVE_PROXY_GO FLB_HAVE_JEMALLOC JEMALLOC_MANGLE FLB_HAVE_LIBBACKTRACE FLB_HAVE_REGEX FLB_HAVE_UTF8_ENCODER FLB_HAVE_LUAJIT FLB_HAVE_C_TLS FLB_HAVE_ACCEPT4 FLB_HAVE_INOTIFY
简单配置文件
以下用一个简单的配置文件采集calico-node-* pod的日志：
[Service]
Parsers_File parsers.conf
[Input]
Name tail
Path /var/log/containers/*_kube-system_calico-node-*.log
Refresh_Interval 10
Skip_Long_Lines true
DB /fluent-bit/bin/pos.db
DB.Sync Normal
Mem_Buf_Limit 5MB
Parser docker
Tag kube.*
[Filter]
Name kubernetes
Match kube.*
Kube_URL https://kubernetes.default.svc:443
Kube_CA_File /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
Kube_Token_File /var/run/secrets/kubernetes.io/serviceaccount/token
Labels false
Annotations true
[Output]
Name stdout
Match_Regex (?:kube|service)\.(.*)
fluent-bit-debug容器内使用以下命令启动测试：
/fluent-bit/bin # ./fluent-bit -c /fluent-bit/config/fluent-bit.conf
可以看到stdout日志输出：
[0] kube.var.log.containers.calico-node-lp4lm_kube-system_calico-node-cca502a39695f7452fd999af97bfbca5d74d2a372d94e0cacf2045f5f9721a81.log: [1634870260.700108403, {"log"=>"{"log":"2021-10-22 02:37:40.699 [INFO][85] monitor-addresses/startup.go 774: Using autodetected IPv4 address on interface bond4: 172.24.248.50/30\n","stream":"stdout","time":"2021-10-22T02:37:40.700056471Z"}", "kubernetes"=>{"pod_name"=>"calico-node-lp4lm", "namespace_name"=>"kube-system", "pod_id"=>"5a829979-9830-4b9c-a3cb-eeb6eee38bdd", "annotations"=>{"kubectl.kubernetes.io/restartedAt"=>"2021-10-20T23:00:27+08:00"}, "host"=>"node02", "container_name"=>"calico-node", "docker_id"=>"cca502a39695f7452fd999af97bfbca5d74d2a372d94e0cacf2045f5f9721a81", "container_hash"=>"calico/node@sha256:bc4a631d553b38fdc169ea4cb8027fa894a656e80d68d513359a4b9d46836b55", "container_image"=>"calico/node:v3.19.1"}}]
截取重要部分，可以看到没经过处理采集到的k8s日志格式。
[
{
"kubernetes"=>{
"pod_name"=>"calico-node-lp4lm",
"namespace_name"=>"kube-system",
"pod_id"=>"5a829979-9830-4b9c-a3cb-eeb6eee38bdd",
"annotations"=>{
"kubectl.kubernetes.io/restartedAt"=>"2021-10-20T23:00:27+08:00"
},
"host"=>"node02",
"container_name"=>"calico-node",
"docker_id"=>"cca502a39695f7452fd999af97bfbca5d74d2a372d94e0cacf2045f5f9721a81",
"container_hash"=>"calico/node@sha256:bc4a631d553b38fdc169ea4cb8027fa894a656e80d68d513359a4b9d46836b55",
"container_image"=>"calico/node:v3.19.1"
}
}
]
增加nest Filter
将kubernetes块展开，并添加kubernetes_前缀：
[Filter]
Name nest
Match kube.*
Operation lift
Nested_under kubernetes
Add_prefix kubernetes_
这次测试输出，截取重要部分：
{
"kubernetes_pod_name"=>"calico-node-lp4lm",
"kubernetes_namespace_name"=>"kube-system",
"kubernetes_pod_id"=>"5a829979-9830-4b9c-a3cb-eeb6eee38bdd",
"kubernetes_annotations"=>{
"kubectl.kubernetes.io/restartedAt"=>"2021-10-20T23:00:27+08:00"
},
"kubernetes_host"=>"node02",
"kubernetes_container_name"=>"calico-node",
"kubernetes_docker_id"=>"cca502a39695f7452fd999af97bfbca5d74d2a372d94e0cacf2045f5f9721a81",
"kubernetes_container_hash"=>"calico/node@sha256:bc4a631d553b38fdc169ea4cb8027fa894a656e80d68d513359a4b9d46836b55",
"kubernetes_container_image"=>"calico/node:v3.19.1"
}
移除掉kubernetes_annotations块
[Filter]
Name modify
Match kube.*
Remove kubernetes_annotations
移除掉kubernetes_annotations块中的某字段
[Filter]
Name nest
Match kube.*
Operation lift
Nested_under kubernetes_annotations
Add_prefix kubernetes_annotations_
[Filter]
Name modify
Match kube.*
Remove kubernetes_annotations_kubectl.kubernetes.io/restartedAt
或者用正则：
[Filter]
Name nest
Match kube.*
Operation lift
Nested_under kubernetes_annotations
Add_prefix kubernetes_annotations_
[Filter]
Name modify
Match kube.*
Remove_regex kubernetes_annotations_kubectl*
修改kubernetes_annotations块中key名称
[Filter]
Name nest
Match kube.*
Operation lift
Nested_under kubernetes_annotations
Add_prefix kubernetes_annotations_
[Filter]
Name modify
Match kube.*
Rename kubernetes_annotations_kubectl.kubernetes.io/restartedAt podIPs
修改之后：
[
{
"kubernetes_pod_name"=>"calico-node-lp4lm",
"kubernetes_namespace_name"=>"kube-system",
"kubernetes_pod_id"=>"5a829979-9830-4b9c-a3cb-eeb6eee38bdd",
"kubernetes_host"=>"node02",
"kubernetes_container_name"=>"calico-node",
"kubernetes_docker_id"=>"cca502a39695f7452fd999af97bfbca5d74d2a372d94e0cacf2045f5f9721a81",
"kubernetes_container_hash"=>"calico/node@sha256:bc4a631d553b38fdc169ea4cb8027fa894a656e80d68d513359a4b9d46836b55",
"kubernetes_container_image"=>"calico/node:v3.19.1",
"podIPs"=>"2021-10-20T23:00:27+08:00"
}
]
结合ks配置采集podIPs
结合kubesphere Filter CR，配置采集podIPs，并去掉其他不相关的annotations。
因使用calico作为CNI，所以在pod annotations中会被添加上podIP相关的注解。
需要保留注解中的某一个key（cni.projectcalico.org/podIPs），移除掉其他key，所以下面将要保留的key修改名称之后，移除掉整个annotations。
kubernetes Filter CR配置如下：
apiVersion: logging.kubesphere.io/v1alpha2
kind: Filter
metadata:
labels:
logging.kubesphere.io/component: logging
logging.kubesphere.io/enabled: 'true'
name: kubernetes
namespace: kubesphere-logging-system
spec:
filters:
- kubernetes:
annotations: true
kubeCAFile: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
kubeTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
kubeURL: 'https://kubernetes.default.svc:443'
labels: false
- nest:
addPrefix: kubernetes_
nestedUnder: kubernetes
operation: lift
- nest:
addPrefix: kubernetes_annotations_
nestedUnder: kubernetes_annotations
operation: lift
- modify:
rules:
- remove: stream
- remove: kubernetes_pod_id
- remove: kubernetes_host
- remove: kubernetes_container_hash
- rename:
kubernetes_annotations_cni.projectcalico.org/podIPs: kubernetes_podIPs
- removeRegex: kubernetes_annotations*
- nest:
nestUnder: kubernetes_annotations
operation: nest
removePrefix: kubernetes_annotations_
wildcard:
- kubernetes_annotations_*
- nest:
nestUnder: kubernetes
operation: nest
removePrefix: kubernetes_
wildcard:
- kubernetes_*
match: kube.*
由kubernetes Filter CR生成的fluent-bit config配置如下（只看Filter部分，Input、Output CR被省略）
[Service]
Parsers_File parsers.conf
[Input]
Name tail
Path /var/log/containers/*.log
Exclude_Path /var/log/containers/*_kubesphere-logging-system_events-exporter*.log,/var/log/containers/kube-auditing-webhook*_kubesphere-logging-system_kube-auditing-webhook*.log
Refresh_Interval 10
Skip_Long_Lines true
DB /fluent-bit/tail/pos.db
DB.Sync Normal
Mem_Buf_Limit 5MB
Parser docker
Tag kube.*
[Filter]
Name kubernetes
Match kube.*
Kube_URL https://kubernetes.default.svc:443
Kube_CA_File /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
Kube_Token_File /var/run/secrets/kubernetes.io/serviceaccount/token
Labels false
Annotations true
[Filter]
Name nest
Match kube.*
Operation lift
Nested_under kubernetes
Add_prefix kubernetes_
[Filter]
Name nest
Match kube.*
Operation lift
Nested_under kubernetes_annotations
Add_prefix kubernetes_annotations_
[Filter]
Name modify
Match kube.*
Remove stream
Remove kubernetes_pod_id
Remove kubernetes_host
Remove kubernetes_container_hash
Rename kubernetes_annotations_cni.projectcalico.org/podIPs kubernetes_podIPs
Remove_regex kubernetes_annotations*
[Filter]
Name nest
Match kube.*
Operation nest
Wildcard kubernetes_annotations_*
Nest_under kubernetes_annotations
Remove_prefix kubernetes_annotations_
[Filter]
Name nest
Match kube.*
Operation nest
Wildcard kubernetes_*
Nest_under kubernetes
Remove_prefix kubernetes_
[Output]
Name es
Match_Regex (?:kube|service)\.(.*)
Host es-cdc-a-es-http.cdc.svc.xke.test.cn
Port 9200
HTTP_User elastic
HTTP_Passwd elasticpwd
Logstash_Format true
Logstash_Prefix ks-logstash-log
Time_Key @timestamp
可以在kibana看到采集到的podIP：
作者简洁
作者：小碗汤，一位热爱、认真写作的小伙，专注于写go语言、docker、kubernetes、java等开发、运维知识等提升硬实力的文章，期待你的关注。转载说明：务必注明来源
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