K8S使用filebeat统一收集应用日志

标签：k8s   filebeat   pod   tomcat   

一、准备和测试tomcat基础镜像
该镜像主要是配置jdk环境变量和tomcat软件包部署，如果有特殊的需求，例如安装其他软件包、配置tomcat https等也可以在dockerfile里面实现。之后如果有对jdk和tomcat进行统一升级，更新基础镜像即可。

1、dockerfile编译镜像并推送到本地仓库

# docker pull centos
# cd tomcat/
# ls
# cat dockerfile 
FROM centos
MAINTAINER yangliangwei "ylw@fjhb.cn"
WORKDIR /home
COPY java1.8.tgz /home/
RUN tar zxf /home/java1.8.tgz -C /usr/local/ && rm -rf /home/java1.8.tgz
ENV JAVA_HOME /usr/local/java/
ENV CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
ENV PATH $PATH:$JAVA_HOME/bin
COPY apache-tomcat-7.0.86.tar.gz /home/
RUN tar zxf apache-tomcat-7.0.86.tar.gz -C /home  && rm -rf /home/apache-tomcat-7.0.86.zip
RUN mv /home/apache-tomcat-7.0.86 /home/tomcat 
EXPOSE 8080
ENTRYPOINT /home/tomcat/bin/startup.sh && tail -f /home/tomcat/logs/catalina.out

# docker build -t tomcat_base:v1.0 .

# docker tag tomcat_base:v1.0 registry.59iedu.com
# docker push registry.59iedu.com/tomcat_base:v1.0

2、其他docker主机通过本地仓库下载镜像run测试

# docker pull registry.59iedu.com/tomcat_base:v1.0
# docker run -idt --name tomcat_test -p 8889:8080 registry.59iedu.com/tomcat_base:v1.0
# curl http://localhost:8889

二、在基础镜像上叠加app并推送到本地仓库
这里选择使用shopxx java开源项目来做模拟java app，将部署的shopxx打包好放入指定位置即可运行。为了简单，这里选择Shopxx调用的数据库放在k8s集群之外，只要pod网络可以正常访问即可。

# cd  shopxx
# cat dockerfile 
FROM registry.59iedu.com/tomcat_base:v1.0
MAINTAINER yangliangwei "ylw@fjhb.cn"
COPY ROOT.tgz /home/
RUN tar zxf /home/ROOT.tgz -C /home/tomcat/webapps/ && rm -rf /home/ROOT.tgz

# docker build -t tomcat_shopxx:v1 .
# docker tag tomcat_shopxx:v1 registry.59iedu.com/tomcat_shopxx:v1 
# docker push registry.59iedu.com/tomcat_shopxx:v1 

三、准备filebeat镜像
Filebeat容器主要负责将app容器里面的日志推送到elasticsearch, 为了降低耦合度及后续的维护难度，创建filebeat容器的时候将filebeat.yml配置文件以configmap的方式实现。所以在镜像编译部分不考虑filebeat.yml配置文件

# cd filebeat-v5.4.0/
# ls -lh

#  cat dockerfile
FROM  docker.io/centos
MAINTAINER YangLiangWei <ylw@fjhb.cn>

# Install Filebeat
WORKDIR /usr/local
COPY filebeat-5.4.0-linux-x86_64.tar.gz  /usr/local
RUN cd /usr/local &&     tar xvf filebeat-5.4.0-linux-x86_64.tar.gz &&     rm -f filebeat-5.4.0-linux-x86_64.tar.gz &&     ln -s /usr/local/filebeat-5.4.0-linux-x86_64 /usr/local/filebeat &&     chmod +x /usr/local/filebeat/filebeat &&     mkdir -p /etc/filebeat

ADD ./docker-entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/docker-entrypoint.sh

ENTRYPOINT ["docker-entrypoint.sh"]

CMD ["/usr/local/filebeat/filebeat","-e","-c","/etc/filebeat/filebeat.yml"]

# cat docker-entrypoint.sh 
#!/bin/bash
set -e 
TMP=${PATHS}
config=/etc/filebeat/filebeat.yml
if [ ${TMP:0:1} = ‘/‘ ] ;then
    tmp=‘"‘${PATHS}‘"‘
fi

env
echo ‘Filebeat init process done. Ready for start up.‘
echo "Using the following configuration:"
cat /etc/filebeat/filebeat.yml
exec "$@"

# docker build -t filebeat-v5.4.0 .
# docker tag filebeat-v5.4.0 registry.59iedu.com/filebeat:v5.4.0 
# docker push registry.59iedu.com/filebeat:v5.4.0

四、准备yaml配置文件
1、tomcat.yaml文件
一个POD里面运行两个容器，两个容器通过emptydir的方式共享/home/tomcat/logs目录下的日志文件。Filebeat的配置文件通过configmap方式挂载进容器

# cat tomcat.yaml 
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: tomcat-shopxx
  namespace: default
spec:
  replicas: 1
  template:
    metadata:
      labels:
        k8s-app: tomcat-shopxx
    spec:
      containers:
      - image: registry.59iedu.com/filebeat:v5.4.0
        imagePullPolicy: Always
        name: filebeat
        volumeMounts:
        - name: app-logs
          mountPath: /log
        - name: filebeat-config
          mountPath: /etc/filebeat/
      - image: registry.59iedu.com/tomcat_shopxx:v1
        name : tomcat-shopxx
        imagePullPolicy: Always
        ports:
        - containerPort: 8080
        volumeMounts:
        - name: app-logs
          mountPath: /home/tomcat/logs
      volumes:
      - name: app-logs
        emptyDir: {}
      - name: filebeat-config
        configMap:
          name: filebeat-config

2、configamp.yaml
通过configmap的形式创建filebeat.yml配置文件，指定收集日志的路径、elasticsearch的配置信息及索引名称

# cat configmap.yaml 
apiVersion: v1
kind: ConfigMap
metadata:
  name: filebeat-config
data:
  filebeat.yml: |
    filebeat.prospectors:
    - input_type: log
      paths:
        - "/var/log/yum.log"
        - "/log/*"
    output.elasticsearch:
      hosts: ["192.168.1.19:9600"]
      index: "filebeat-tomcat-shopxx"

3、service.yaml文件
通过service.yaml文件将shopxx发布出去

# cat service.yaml 
apiVersion: v1
kind: Service
metadata:
  name: tomcat-shopxx
  labels:
    k8s-app: tomcat-shopxx
spec:
  type: NodePort
  ports:
  - port: 8080
    protocol: TCP
    targetPort: 8080
    name: http
    nodePort: 8480
  selector:
    k8s-app: tomcat-shopxx

五、通过yaml配置文件创建pod、configmap、service

# kubectl create -f .
# kubectl get pod
# kubectl get svc
# kubectl get deployment

六、测试与验证
Filebeat容器日志：

Shopxx容器日志：

使用elasticsearch-head插件查看对应的索引：



访问web测试：

K8S使用filebeat统一收集应用日志

标签：k8s   filebeat   pod   tomcat   

原文地址：http://blog.51cto.com/ylw6006/2107307