k8s系列---EFK日志系统

文章拷于：http://blog.itpub.net/28916011/viewspace-2216748/ 用于自己备份记录错误

一个完整的k8s集群，应该包含如下六大部分：kube-dns、ingress-controller、metrics server监控系统、dashboard、存储和EFK日志系统。

我们的日志系统要部署在k8s集群之外，这样即使整个k8s集群宕机了，我们还能从外置的日志系统查看到k8s宕机前的日志。

另外，我们生产部署的日志系统要单独放在一个存储卷上。这里我们为了方便，本次测试关闭了日志系统的存储卷功能。

1、添加incubator源（这个源是开发版的安装包，用起来可能不稳定）

访问https://hub.kubeapps.com/charts

[root@master ~]# helm repo list
NAME  URL                                                   
local http://127.0.0.1:8879/charts                          
stablehttps://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts

[root@master efk]# helm repo add incubator https://kubernetes-charts-incubator.storage.googleapis.com
"incubator" has been added to your repositories

[root@master efk]# helm repo list
NAME     URL                                                       
local    http://127.0.0.1:8879/charts                              
stable   https://kubernetes.oss-cn-hangzhou.aliyuncs.com/charts    
incubatorhttps://kubernetes-charts-incubator.storage.googleapis.com

2、下载elasticsearch

[root@master efk]# helm fetch incubator/elasticsearch
[root@master efk]# ls
elasticsearch-1.10.2.tgz
[root@master efk]# tar -xvf elasticsearch-1.10.2.tgz

3、关闭存储卷（生产上不要关，我们这里为了测试方便才关的）

[root@master efk]# vim elasticsearch/values.yaml 
把
 persistence:
    enabled: true
改成
 persistence:
    enabled: false
有两处需要改

上面我们关闭了存储卷的功能，而改用本地目录来存储日志。

4、创建单独的名称空间

[root@master efk]# kubectl   create namespace efk
namespace/logs created

[root@master efk]# kubectl get ns
NAME               STATUS    AGE
ekf               Active    13s

5、把elasticsearch安装在efk名称空间中，我没用这个方式，用的下面的

[root@master efk]# helm install --name els1 --namespace=efk -f elasticsearch/values.yaml incubator/elasticsearch
NAME:   els1
LAST DEPLOYED: Thu Oct 18 01:59:15 2018
NAMESPACE: efk
STATUS: DEPLOYED
RESOURCES:
==> v1/Pod(related)
NAME                                        READY  STATUS   RESTARTS  AGE
els1-elasticsearch-client-58899f6794-gxn7x  0/1    Pending  0         0s
els1-elasticsearch-client-58899f6794-mmqq6  0/1    Pending  0         0s
els1-elasticsearch-data-0                   0/1    Pending  0         0s
els1-elasticsearch-master-0                 0/1    Pending  0         0s
==> v1/ConfigMap
NAME                DATA  AGE
els1-elasticsearch  4     1s
==> v1/Service
NAME                          TYPE       CLUSTER-IP      EXTERNAL-IP  PORT(S)   AGE
els1-elasticsearch-client     ClusterIP  10.103.147.142  <none>       9200/TCP  0s
els1-elasticsearch-discovery  ClusterIP  None            <none>       9300/TCP  0s
==> v1beta1/Deployment
NAME                       DESIRED  CURRENT  UP-TO-DATE  AVAILABLE  AGE
els1-elasticsearch-client  2        0        0           0          0s
==> v1beta1/StatefulSet
NAME                       DESIRED  CURRENT  AGE
els1-elasticsearch-data    2        1        0s
els1-elasticsearch-master  3        1        0s
NOTES:
The elasticsearch cluster has been installed.
***
Please note that this chart has been deprecated and moved to stable.
Going forward please use the stable version of this chart.
***
Elasticsearch can be accessed:
  * Within your cluster, at the following DNS name at port 9200:
    els1-elasticsearch-client.efk.svc
  * From outside the cluster, run these commands in the same shell:
    export POD_NAME=$(kubectl get pods --namespace efk -l "app=elasticsearch,component=client,release=els1" -o jsonpath="{.items[0].metadata.name}")
    echo "Visit http://127.0.0.1:9200 to use Elasticsearch"
    kubectl port-forward --namespace efk $POD_NAME 9200:9200

说明：--name els1是chart部署后的release名字，名字自己随便取就行。

上面我们是通过values.yaml文件在线安装的els。但是我们已经下载els安装包了，也可以通过下载的els包进行离线安装，如下：

[root@master efk]# ls
elasticsearch  elasticsearch-1.10.2.tgz

root@master efk]# helm  install --name els1 --namespace=efk ./elasticsearch

说明：./elasticsearch就是当前els安装包目录的名字。

安装完后，我们就能在efk名称空间中看到相应的pods资源了（我在安装elasticsearch时，当时是安装不上的，因为说是打不开elasticseartch的官网，也就是不能再这个官网下载镜像，后来我就放置了两天没管，再登录上看，发现镜像竟然自己下载好了，真是有意思）我是第一次没安装成，机器内存小了，然后又加的内存。删掉了这个namespace第二天又重新建的，然后一次成功了。

[root@master efk]#  kubectl get pods -n efk -o wide
NAME                                         READY     STATUS    RESTARTS   AGE       IP             NODE
els1-elasticsearch-client-78b54979c5-kzj7z   1/1       Running   2          1h        10.244.2.157   node2
els1-elasticsearch-client-78b54979c5-xn2gb   1/1       Running   1          1h        10.244.2.151   node2
els1-elasticsearch-data-0                    1/1       Running   0          1h        10.244.1.165   node1
els1-elasticsearch-data-1                    1/1       Running   0          1h        10.244.2.169   node2
els1-elasticsearch-master-0                  1/1       Running   0          1h        10.244.1.163   node1
els1-elasticsearch-master-1                  1/1       Running   0          1h        10.244.2.168   node2
els1-elasticsearch-master-2                  1/1       Running   0          57m       10.244.1.170   node1

查看安装好的release：

[root@master efk]# helm list
NAME  REVISIONUPDATED                 STATUS  CHART               NAMESPACE
els1  1       Thu Oct 18 23:11:54 2018DEPLOYEDelasticsearch-1.10.2efk

查看els1的状态：

[root@k8s-master1 ~]# helm status els1
  * Within your cluster, at the following DNS name at port 9200:
    els1-elasticsearch-client.efk.svc  ##这个就是els1 service的主机名
  * From outside the cluster, run these commands in the same shell:
    export POD_NAME=$(kubectl get pods --namespace efk -l "app=elasticsearch,component=client,release=els1" -o jsonpath="{.items[0].metadata.name}")
    echo "Visit http://127.0.0.1:9200 to use Elasticsearch"
    kubectl port-forward --namespace efk $POD_NAME 9200:9200

cirror是专门为测试虚拟环境的客户端，它可以快速创建一个kvm的虚拟机，一共才几兆的大小，而且里面提供的工具还是比较完整的。

下面我们运行cirror：

[root@k8s-master1 ~]# kubectl run cirror-$RANDOM --rm -it --image=cirros -- /bin/sh
kubectl run --generator=deployment/apps.v1beta1 is DEPRECATED and will be removed in a future version. Use kubectl create instead.
If you don't see a command prompt, try pressing enter.
/ #
/ # nslookup els1-elasticsearch-client.efk.svc
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local
Name:      els1-elasticsearch-client.efk.svc
Address 1: 10.103.105.170 els1-elasticsearch-client.efk.svc.cluster.local

因为我删除namespace后出现了其他问题，最后重启了集群，没想到flannel又鸡巴的出问题了，routing模式又没了，然后nslookup一直出问题，我还以为我的版本又出了问题，最后删了flannel又重新生成

-rm：表示退出我们就直接删除掉

-it：表示交互式登录

上面我们看到els1-elasticsearch-client.efk.svc服务名解析出来的ip地址。

下面我们再访问http:els1-elasticsearch-client.efk.svc:9200 页面：

/ # curl els1-elasticsearch-client.efk.svc:9200
curl: (6) Couldn't resolve host 'els1-elasticsearch-client.efk.svc'
/ # 
/ # curl els1-elasticsearch-client.efk.svc.cluster.local:9200
{
  "name" : "els1-elasticsearch-client-b898c9d47-5gwzq",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "RFiD2ZGWSAqM2dF6wy24Vw",
  "version" : {
    "number" : "6.4.2",
    "build_flavor" : "oss",
    "build_type" : "tar",
    "build_hash" : "04711c2",
    "build_date" : "2018-09-26T13:34:09.098244Z",
    "build_snapshot" : false,
    "lucene_version" : "7.4.0",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

看里面的内容：

/ # curl els1-elasticsearch-client.efk.svc.cluster.local:9200/_cat
=^.^=
/_cat/allocation
/_cat/shards
/_cat/shards/{index}
/_cat/master
/_cat/nodes
/_cat/tasks
/_cat/indices
/_cat/indices/{index}
/_cat/segments
/_cat/segments/{index}
/_cat/count
/_cat/count/{index}
/_cat/recovery
/_cat/recovery/{index}
/_cat/health
/_cat/pending_tasks
/_cat/aliases
/_cat/aliases/{alias}
/_cat/thread_pool
/_cat/thread_pool/{thread_pools}
/_cat/plugins
/_cat/fielddata
/_cat/fielddata/{fields}
/_cat/nodeattrs
/_cat/repositories
/_cat/snapshots/{repository}
/_cat/templates

看有几个节点：

/ # curl els1-elasticsearch-client.efk.svc.cluster.local:9200/_cat/nodes
10.244.2.104 23 95 0 0.00 0.02 0.05 di - els1-elasticsearch-data-0
10.244.4.83  42 99 1 0.01 0.11 0.13 mi * els1-elasticsearch-master-1
10.244.4.81  35 99 1 0.01 0.11 0.13 i  - els1-elasticsearch-client-b898c9d47-5gwzq
10.244.4.84  31 99 1 0.01 0.11 0.13 mi - els1-elasticsearch-master-2
10.244.2.105 35 95 0 0.00 0.02 0.05 i  - els1-elasticsearch-client-b898c9d47-shqd2
10.244.4.85  18 99 1 0.01 0.11 0.13 di - els1-elasticsearch-data-1
10.244.4.82  40 99 1 0.01 0.11 0.13 mi - els1-elasticsearch-master-0

6、把fluentd安装在efk空间中

[root@k8s-master1 ~]# helm fetch  incubator/fluentd-elasticsearch

[root@k8s-master1 ~]# tar -xvf fluentd-elasticsearch-0.7.2.tgz

[root@k8s-master1 ~]# cd fluentd-elasticsearch

[root@k8s-master1 fluentd-elasticsearch]# vim values.yaml 
1、改其中的host: 'elasticsearch-client'，改成host: 'els1-elasticsearch-client.efk.svc.cluster.local'表示到哪找我们的elasticsearch服务。
2、改tolerations污点，表示让k8s master也能接受部署fluentd pod，这样才能收集主节点的日志：
把
tolerations: {}
  # - key: node-role.kubernetes.io/master
  #   operator: Exists
  #   effect: NoSchedule
改成
tolerations: 
  - key: node-role.kubernetes.io/master
    operator: Exists
    effect: NoSchedule
3、改annotations，这样也就能收集监控prometheus的日志了
把
annotations: {}
  # prometheus.io/scrape: "true"
  # prometheus.io/port: "24231"
大概就这个位置我的annotations下面是PodAnnktation的位置，底下改的。改成
annotations:
  prometheus.io/scrape: "true"
  prometheus.io/port: "24231"
同时把
service: {}
  # type: ClusterIP
  # ports:
  #   - name: "monitor-agent"
  #     port: 24231
改成
service: 
  type: ClusterIP
  ports:
    - name: "monitor-agent"
    port: 24231
  这样通过service 24231找监控prometheus的fluentd

开始安装fluentd：

[root@k8s-master1 fluentd-elasticsearch]# helm install --name fluentd1 --namespace=efk -f values.yaml  ./

[root@k8s-master1 fluentd-elasticsearch]# helm list
NAME    REVISIONUPDATED                 STATUS  CHART                      NAMESPACE
els1    1       Sun Nov  4 09:37:35 2018DEPLOYEDelasticsearch-1.10.2       efk      
fluentd11       Tue Nov  6 09:28:42 2018DEPLOYEDfluentd-elasticsearch-0.7.2efk

[root@k8s-master1 fluentd-elasticsearch]# kubectl get pods -n efk
NAME                                        READY   STATUS             RESTARTS   AGE
els1-elasticsearch-client-b898c9d47-5gwzq   1/1     Running            0          47h
els1-elasticsearch-client-b898c9d47-shqd2   1/1     Running            0          47h
els1-elasticsearch-data-0                   1/1     Running            0          47h
els1-elasticsearch-data-1                   1/1     Running            0          45h
els1-elasticsearch-master-0                 1/1     Running            0          47h
els1-elasticsearch-master-1                 1/1     Running            0          45h
els1-elasticsearch-master-2                 1/1     Running            0          45h
fluentd1-fluentd-elasticsearch-9k456        1/1     Running           0          2m28s
fluentd1-fluentd-elasticsearch-dcnsc        1/1     Running           0          2m28s
    fluentd1-fluentd-elasticsearch-p5h88        1/1   Running           0          2m28s
fluentd1-fluentd-elasticsearch-sdvn9        1/1     Running           0          2m28s
fluentd1-fluentd-elasticsearch-ztm9s        1/1     Running           0          2m28s

7、把kibanna安装在efk空间中

注意，安装kibana的版本号一定要和elasticsearch的版本号一致，否则二者无法结合起来。我刚开始没在意，后面看日志发现的确有这个问题的存在，然后把kibanna的value.yaml改成了和es一致的版本，两个版本可以从value里看到

[root@k8s-master1 ~]# helm fetch stable/kibana
[root@k8s-master1 ~]# ls
 kibana-0.2.2.tgz

[root@k8s-master1 ~]# tar -xvf kibana-0.2.2.tgz  
[root@k8s-master1 ~]# cd kibana

修改ELASTICSEARCH_URL，把type改成NodePort类型

[root@master kibana]# cat values.yaml |more
image:
  repository: "docker.elastic.co/kibana/kibana-oss"
  tag: "6.4.2"
  pullPolicy: "IfNotPresent"

env:
  # All Kibana configuration options are adjustable via env vars.
  # To adjust a config option to an env var uppercase + replace `.` with `_`
  # Ref: https://www.elastic.co/guide/en/kibana/current/settings.html
  #
  ELASTICSEARCH_URL: http://els1-elasticsearch-client.efk.svc:9200
  #SERVER_PORT: 9200
  # LOGGING_VERBOSE: "true"
  # SERVER_DEFAULTROUTE: "/app/kibana"

service:
  type: NodePort
  externalPort: 443
  internalPort: 5601
  ## External IP addresses of service
  ## Default: nil
  ##
  # externalIPs:
  # - 192.168.0.1

开始部署kibana：

[root@k8s-master1 kibana]# helm install --name=kib1 --namespace=efk -f values.yaml ./
==> v1/Service
NAME         TYPE      CLUSTER-IP    EXTERNAL-IP  PORT(S)        AGE
kib1-kibana  NodePort  10.108.188.4  <none>       443:31865/TCP  0s

[root@k8s-master1 kibana]# kubectl get svc -n efk
NAME                           TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)         AGE
els1-elasticsearch-client      ClusterIP   10.103.105.170   <none>        9200/TCP        2d22h
els1-elasticsearch-discovery   ClusterIP   None             <none>        9300/TCP        2d22h
kib1-kibana                    NodePort    10.108.188.4     <none>        443:31865/TCP   4m27s

[root@k8s-master1 kibana]# kubectl get pods -n efk 
NAME                                        READY   STATUS              RESTARTS   AGE
els1-elasticsearch-client-b898c9d47-5gwzq   1/1     Running             0          2d22h
els1-elasticsearch-client-b898c9d47-shqd2   1/1     Running             0          2d22h
els1-elasticsearch-data-0                   1/1     Running             0          22h
els1-elasticsearch-data-1                   1/1     Running             0          22h
els1-elasticsearch-master-0                 1/1     Running             0          2d22h
els1-elasticsearch-master-1                 1/1     Running             0          2d19h
els1-elasticsearch-master-2                 1/1     Running             0          2d19h
fluentd1-fluentd-elasticsearch-9k456        1/1     Running             0          22h
fluentd1-fluentd-elasticsearch-dcnsc        1/1     Running             0          22h
fluentd1-fluentd-elasticsearch-p5h88        1/1     Running             0          22h
fluentd1-fluentd-elasticsearch-sdvn9        1/1     Running             0          22h
fluentd1-fluentd-elasticsearch-ztm9s        1/1     Running             0          22h
kib1-kibana-68f9fbfd84-pt2dt                0/1     Running   0          9m59s #这个镜像如果下载不下来，多等几天就下载下来了，我是一下就下载下来了

然后找个浏览器，打开宿主机ip:nodeport

https://172.16.22.201:31865

不过我这个打开的页面有错误，做如下操作即可：我那个时候也有错，有时能删掉，有时删也删不掉，就没管他，最后登录正常

[root@k8s-master1 ~]# kubectl get pods -n efk |grep ela
els1-elasticsearch-client-b898c9d47-8pntr   1/1     Running   1          43h
els1-elasticsearch-client-b898c9d47-shqd2   1/1     Running   1          5d13h
els1-elasticsearch-data-0                   1/1     Running   0          117m
els1-elasticsearch-data-1                   1/1     Running   0          109m
els1-elasticsearch-master-0                 1/1     Running   1          2d11h
els1-elasticsearch-master-1                 1/1     Running   0          14h
els1-elasticsearch-master-2                 1/1     Running   0          14h
[root@k8s-master1 ~]# kubectl exec -it els1-elasticsearch-client-b898c9d47-shqd2  -n efk -- /bin/bash 
删除elasticsearch下的.kibana即可
[root@els1-elasticsearch-client-b898c9d47-shqd2 elasticsearch]#  curl -XDELETE http://els1-elasticsearch-client.efk.svc:9200/.kibana

最终，看到我们做出了EFK的日志收集系统

k8s系列---EFK日志系统

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