kubernetes-基于Prometheus监控redis(redis-exporter)

1、安装和配置redis-exporter

1.1 使用helm安装redis-exporter

在本方案的redis-exporter在Kubernetes集群中进行部署,并假设在kube-public命名空间下已经部署了redis,对外暴露的服务名称为redis-service。redis-exporter负责从redis中获取指标数据,并将这些数据传递给Prometheus。

$ helm install --name prom-exporter --set "redisAddress=redis://redis-service:6379" stable/prometheus-redis-exporter --namespace=kube-public

redis-exporter部署的主要参数和说明:

参数 描述 Default
replicaCount 副本数量 1
image.repository prometheus-redis-exporter镜像 oliver006/redis_exporter
image.tag prometheus-redis-exporter image tag v1.3.4
image.pullPolicy 镜像拉取策略 IfNotPresent
image.pullSecrets 镜像拉取密文 {}
extraArgs extra arguments for the binary; possible values here {}
env additional environment variables in YAML format. Can be used to pass credentials as env variables (via secret) as per the image readme here {}
resources cpu/memory resource requests/limits {}
service.type desired service type ClusterIP
service.port service external port 9121
service.annotations Custom annotations for service {}
service.labels Additional custom labels for the service {}
redisAddress Address of the Redis instance to scrape. Use rediss:// for SSL. redis://myredis:6379
annotations pod annotations for easier discovery {}
rbac.create Specifies whether RBAC resources should be created. true
rbac.pspEnabled Specifies whether a PodSecurityPolicy should be created. true
serviceAccount.create Specifies whether a service account should be created. true
serviceAccount.name Name of the service account.
serviceMonitor.enabled Use servicemonitor from prometheus operator false
serviceMonitor.namespace Namespace this servicemonitor is installed in
serviceMonitor.interval How frequently Prometheus should scrape
serviceMonitor.telemetryPath Path to redis-exporter telemtery-path
serviceMonitor.labels Labels for the servicemonitor passed to Prometheus Operator {}
serviceMonitor.timeout Timeout after which the scrape is ended
serviceMonitor.targetLabels Set of labels to transfer on the Kubernetes Service onto the target.
prometheusRule.enabled Set this to true to create prometheusRules for Prometheus operator false
prometheusRule.additionalLabels Additional labels that can be used so prometheusRules will be discovered by Prometheus {}
prometheusRule.namespace namespace where prometheusRules resource should be created
prometheusRule.rules rules to be created, check values for an example. []
script.configmap Let you run a custom lua script from a configmap. The corresponding environment variable REDIS_EXPORTER_SCRIPT will be set automatically
script.keyname Name of the key inside configmap which contains your script
auth.enabled Specifies whether redis uses authentication false
auth.secret.name Name of existing redis secret (ignores redisPassword)
auth.secret.key Name of key containing password to be retrieved from the existing secret
auth.redisPassword Redis password (when not stored in a secret)

1.2 对外暴露redis-exporter

通过下面的命令,将集中部署的redis-exporter暴露给集群外的用户访问。

$ kubectl expose deployment prom-exporter-prometheus-redis-exporter --type=NodePort --namespace=kube-public

1.3 查看redis指标数据

在浏览器中,访问redis-exporter,能够看到所要监控的redis指标。

# HELP go_gc_duration_seconds A summary of the GC invocation durations.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile=”0″} 0
go_gc_duration_seconds{quantile=”0.25″} 0
go_gc_duration_seconds{quantile=”0.5″} 0
go_gc_duration_seconds{quantile=”0.75″} 0
go_gc_duration_seconds{quantile=”1″} 0
go_gc_duration_seconds_sum 0
go_gc_duration_seconds_count 0
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 8
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version=”go1.13.4″} 1
# HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
# TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 1.198456e+06
# HELP go_memstats_alloc_bytes_total Total number of bytes allocated, even if freed.
# TYPE go_memstats_alloc_bytes_total counter
go_memstats_alloc_bytes_total 1.198456e+06
# HELP go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table.
# TYPE go_memstats_buck_hash_sys_bytes gauge
go_memstats_buck_hash_sys_bytes 1.442979e+06
# HELP go_memstats_frees_total Total number of frees.
# TYPE go_memstats_frees_total counter
go_memstats_frees_total 248
# HELP go_memstats_gc_cpu_fraction The fraction of this program’s available CPU time used by the GC since the program started.
# TYPE go_memstats_gc_cpu_fraction gauge
go_memstats_gc_cpu_fraction 0
# HELP go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata.
# TYPE go_memstats_gc_sys_bytes gauge
go_memstats_gc_sys_bytes 2.240512e+06
# HELP go_memstats_heap_alloc_bytes Number of heap bytes allocated and still in use.
# TYPE go_memstats_heap_alloc_bytes gauge
go_memstats_heap_alloc_bytes 1.198456e+06
# HELP go_memstats_heap_idle_bytes Number of heap bytes waiting to be used.
# TYPE go_memstats_heap_idle_bytes gauge
go_memstats_heap_idle_bytes 6.4086016e+07
# HELP go_memstats_heap_inuse_bytes Number of heap bytes that are in use.
# TYPE go_memstats_heap_inuse_bytes gauge
go_memstats_heap_inuse_bytes 2.465792e+06
# HELP go_memstats_heap_objects Number of allocated objects.
# TYPE go_memstats_heap_objects gauge
go_memstats_heap_objects 3334
# HELP go_memstats_heap_released_bytes Number of heap bytes released to OS.
# TYPE go_memstats_heap_released_bytes gauge
go_memstats_heap_released_bytes 6.4053248e+07
# HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system.
# TYPE go_memstats_heap_sys_bytes gauge
go_memstats_heap_sys_bytes 6.6551808e+07
# HELP go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection.
# TYPE go_memstats_last_gc_time_seconds gauge
go_memstats_last_gc_time_seconds 0
# HELP go_memstats_lookups_total Total number of pointer lookups.
# TYPE go_memstats_lookups_total counter
go_memstats_lookups_total 0
# HELP go_memstats_mallocs_total Total number of mallocs.
# TYPE go_memstats_mallocs_total counter
go_memstats_mallocs_total 3582
# HELP go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures.
# TYPE go_memstats_mcache_inuse_bytes gauge
go_memstats_mcache_inuse_bytes 83328
# HELP go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system.
# TYPE go_memstats_mcache_sys_bytes gauge
go_memstats_mcache_sys_bytes 98304
# HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures.
# TYPE go_memstats_mspan_inuse_bytes gauge
go_memstats_mspan_inuse_bytes 27608
# HELP go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system.
# TYPE go_memstats_mspan_sys_bytes gauge
go_memstats_mspan_sys_bytes 32768
# HELP go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place.
# TYPE go_memstats_next_gc_bytes gauge
go_memstats_next_gc_bytes 4.473924e+06
# HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations.
# TYPE go_memstats_other_sys_bytes gauge
go_memstats_other_sys_bytes 707669
# HELP go_memstats_stack_inuse_bytes Number of bytes in use by the stack allocator.
# TYPE go_memstats_stack_inuse_bytes gauge
go_memstats_stack_inuse_bytes 557056
# HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator.
# TYPE go_memstats_stack_sys_bytes gauge
go_memstats_stack_sys_bytes 557056
# HELP go_memstats_sys_bytes Number of bytes obtained from system.
# TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 7.1631096e+07
# HELP go_threads Number of OS threads created.
# TYPE go_threads gauge
go_threads 7
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 0.07
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 65536
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 9
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 4.58752e+06
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1.58528265239e+09
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 1.14233344e+08
# HELP process_virtual_memory_max_bytes Maximum amount of virtual memory available in bytes.
# TYPE process_virtual_memory_max_bytes gauge
process_virtual_memory_max_bytes -1
# HELP redis_exporter_build_info redis exporter build_info
# TYPE redis_exporter_build_info gauge
redis_exporter_build_info{build_date=”2019-11-15-19:32:19″,commit_sha=”e15c7d22b9151c3681c60b5df5cd552584bef10d”,golang_version=”go1.13.4″,version=”v1.3.4″} 1
# HELP redis_exporter_last_scrape_duration_seconds exporter_last_scrape_duration_seconds metric
# TYPE redis_exporter_last_scrape_duration_seconds gauge
redis_exporter_last_scrape_duration_seconds 0.019919049
# HELP redis_exporter_last_scrape_error The last scrape error status.
# TYPE redis_exporter_last_scrape_error gauge
redis_exporter_last_scrape_error{err=”NOAUTH Authentication required.”} 1
# HELP redis_exporter_scrape_duration_seconds Duration of scrape by the exporter
# TYPE redis_exporter_scrape_duration_seconds summary
redis_exporter_scrape_duration_seconds{quantile=”0.5″} NaN
redis_exporter_scrape_duration_seconds{quantile=”0.9″} NaN
redis_exporter_scrape_duration_seconds{quantile=”0.99″} NaN
redis_exporter_scrape_duration_seconds_sum 0
redis_exporter_scrape_duration_seconds_count 0
# HELP redis_exporter_scrapes_total Current total redis scrapes.
# TYPE redis_exporter_scrapes_total counter
redis_exporter_scrapes_total 1
# HELP redis_target_scrape_request_errors_total Errors in requests to the exporter
# TYPE redis_target_scrape_request_errors_total counter
redis_target_scrape_request_errors_total 0
# HELP redis_up Information about the Redis instance
# TYPE redis_up gauge
redis_up 0

2、Prometheus监控

2.1 配置Prometheus

在Prometheus的配置文件(Prometheus.yaml)中,添加红色字体部分的内容。

global:
scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
# scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
alertmanagers:
– static_configs:
– targets:
# – alertmanager:9093

# Load rules once and periodically evaluate them according to the global ‘evaluation_interval’.
rule_files:
# – “first_rules.yml”
# – “second_rules.yml”

# A scrape configuration containing exactly one endpoint to scrape:
# Here it’s Prometheus itself.
scrape_configs:
# The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
– job_name: ‘prometheus’

# metrics_path defaults to ‘/metrics’
# scheme defaults to ‘http’.

static_configs:
– targets: [‘localhost:9090’]

# 配置从redis-exporter中获取数据,目标地址为:redis-exporter-np:9121

– job_name: ‘redis’
static_configs:
– targets: [‘redis-exporter-np:9121’]

2.2 配置验证

在浏览器的地址栏访问http://{prometheus}/targets,将会看到新配置的redis。

2.3 查看指标情况

在浏览器的地址栏访问http://{prometheus}/graph,在此处执行:rate(process_cpu_seconds_total[10m])

 

作者简介:

季向远,北京神舟航天软件技术有限公司。本文版权归原作者所有。

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