SpringBoot 项目创建完成后,通常会打成 jar 包运行,如果不使用 Kubernetes 可以直接通过 java -jar 或者脚本启动,如果需要发布到 Kubernetes 环境,那么需要编写 Dockerfile、构建镜像、推送到远程 harbor、编写 Kubernetes yaml 等步骤,假设目前你已经完成 SpringBoot 项目开发环境正常运行和打包,下面我会详细介绍如何完成镜像构建和运行这个过程。
FROM docker.hub.com/dev/centos:7
MAINTAINER <shj@qq.com>
ADD java.tar.gz /usr/local/
ENV JAVA_HOME=/usr/local/java
ENV JRE_HOME=$JAVA_HOME/jre
ENV CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib:$CLASSPATH
ENV JAVA_OPTS="$JAVA_OPTS -Dfile.encoding=UTF8 -Duser.timezone=GMT+08"
ENV PATH=.:$JAVA_HOME/bin:$PATH
docker build -t jdk:8u231 .
docker push jdk:8u231
FROM docker.hub.com/dev/jdk:8u231
MAINTAINER <shj@qq.com>
ADD elb.jar /usr/local/src/elb.jar
ADD startup.sh /usr/local/src/elb/
docker build -t elb:2.0 .
docker push elb:2.0
apiVersion: v1
data:
system.properties: |
######################系统配置######################
server.tomcat.uri-encoding = UTF-8
spring.http.encoding.charset = UTF-8
spring.http.encoding.enabled = true
.......
db.properties: |
######################数据库配置#####################
.......
logback.xml: |
<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true" scanPeriod="5 seconds" debug="false">
.........
</configuration>
kind: ConfigMap
metadata:
name: elb-config
namespace: default
apiVersion: apps/v1
kind: Deployment
metadata:
name: elb-deployment
spec:
selector:
matchLabels:
app: elb
replicas: 1
template:
metadata:
labels:
app: elb
spec:
containers:
- name: elb
image: docker.hub.com/dev/elb:2.0
imagePullPolicy: Always
#command: ["/bin/bash","-c", "java -jar /usr/local/src/elb/elb.jar"]
command: ["/bin/bash","-c", "/usr/local/src/elb/start.sh"]
ports:
- containerPort: 8080
env:
- name: LANG
value: en_US.utf8
volumeMounts:
- mountPath: /etc/localtime
name: date-config
- mountPath: /conf/elb
name: elb-config
- mountPath: /logs/elb
name: elb-log
volumes:
- name: date-config
hostPath:
path: /etc/localtime
- name: elb-log
hostPath:
path: /logs/elb/
- name: elb-config
configMap:
name: elb-config
items:
- key: system.properties
path: system.properties
- key: logback.xml
path: logback.xml
- key: db.properties
path: db.properties
apiVersion: v1
kind: Service
metadata:
name: spt-service
labels:
app: sbt-service
spec:
type: NodePort
ports:
- name: http
port: 8080
targetPort: 8080
nodePort: 30111
selector:
app: elb
如上所示已经完成 SpringBoot 项目的镜像构建以及 Kubernetes yaml 文件的编写和运行,即便如此,依然会遇到各种各样的问题,出现问题后注意通过 kubectl logs 观察服务日志输出,通过输出分析异常所在,一般情况下异常都是服务本身导致,比如镜像路径,执行脚本不存在等。如果从服务本身找不到问题,可以分析下基础镜像是否正常,比如运行一个简单服务,验证基础镜像正确性。