roomtriada.blogg.se - Spring boot docker syslog

SPRING BOOT DOCKER SYSLOG INSTALL

NOTICE: The –tag option will give the image its name, and –rm=true will remove intermediate images after it's been built successfully. To finally build the image and store it in the local library, we have to run: docker build -tag=alpine-java:base -rm=true.

SPRING BOOT DOCKER SYSLOG INSTALL

Here we're utilizing Alpine Linux's package manager, apk, to install the Java 8 OpenJDK. RUN: With the RUN command, we're executing a shell command-line within the target system.MAINTAINER: A MAINTAINER is usually an email address, identifying the author of an image.If this image isn't in the local library, an online-search on DockerHub, or on any other configured remote-registry, is performed. FROM: The keyword FROM tells Docker to use a given image with its tag as build-base.To do so, we can use a Dockerfile with Alpine as a base image, and install the JDK of our choice: FROM alpine:edge Alternatively, we can build our own base image (based on Alpine or any other operating system).

The base image ( openjdk:8-jdk-alpine) we have used so far contained a distribution of the Alpine operating system with a JDK 8 already installed. Then we can build our images, create the defined containers, and start it in one command: If the option external is set to true, it will use an existing one with the given name.īefore we continue, we'll check our build-file for syntax-errors: $> docker-compose config In this example, we let docker-compose create a named network of type ‘bridge' for us.

networks: In this section, we're specifying the networks available to our services.

A given name-value must be listed in the networks section.

networks: This is the identifier of the named networks to use.

Otherwise, it's searching for this image in the library or remote-registry.

image: Tells Docker which name it should give to the image when build-features are used.

dockerfile: If given, it sets an alternate name for a Dockerfile.

context: If given, it specifies the build-directory, where the Dockerfile is looked-up.

build: If given, docker-compose is able to build an image from a Dockerfile.

services: Each object in this key defines a service, a.k.a container.

Here we use the newer version, whereas the legacy format is ‘1'.

version: Specifies which format version should be used.

We can combine the configuration for both services in one file called docker-compose.yml: version: '2' To create an image from our Dockerfile, we have to run ‘docker build' like before: We must define them as JSON-Array because we'll use an ENTRYPOINT in combination with a CMD for some application arguments.

ENTRYPOINT: This will be the executable to start when the container is booting.

COPY: We let Docker copy our jar file into the image.MAINTAINER: The maintainer of the image.FROM: As the base for our image, we'll take the Java-enabled Alpine Linux created in the previous section.

This file contains the following information: To dockerize the application, we first create a file named Dockerfile with the following content: FROM openjdk:8-jdk-alpineĬOPY target/docker-message-server-1.0.0.jar message-server-1.0.0.jarĮNTRYPOINT Now we have a working Spring Boot application that we can access at localhost:8888/messages. Next, we'll start up the Spring Boot application: $> java -jar target/docker-message-server-1.0.0.jar