| title | slug | weight |
|---|---|---|
Dockerfile ONBUILD |
Dockerfile-ONBUILD |
18 |
The ONBUILD instruction is a trigger. It sets instructions that will be executed when another image is built from the image being build.
This is useful for building images which will be used as a base to build other images.
ONBUILD COPY . /src
You can't chain ONBUILD instructions with ONBUILD. ONBUILD can't be used to trigger FROM instructions.
FROM nginx:1.16-alpine
WORKDIR /usr/share/nginx/html
ONBUILD COPY index.html . docker build -t sangam14/onbuild-dockerfile -f dockerfile.onbuild .
[+] Building 5.8s (7/7) FINISHED
=> [internal] load build definition from dockerfile.onbuild 0.0s
=> => transferring dockerfile: 129B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/nginx:1.16-alpine 3.3s
=> [auth] library/nginx:pull token for registry-1.docker.io 0.0s
=> [1/2] FROM docker.io/library/nginx:1.16-alpine@sha256:5057451e461dda671da5e951019ddbff9d96a751fc7d548053523ca1f848c1ad 2.4s
=> => resolve docker.io/library/nginx:1.16-alpine@sha256:5057451e461dda671da5e951019ddbff9d96a751fc7d548053523ca1f848c1ad 0.0s
=> => sha256:f07e4bcf42b862c240f4c00f2f7ed362d7d93ca15151de547beda593f3b669e5 2.72MB / 2.72MB 0.8s
=> => sha256:078902f02c3a797288251014301298bd748886eaf5fc107e128cc1b4933ec57d 6.25MB / 6.25MB 2.1s
=> => sha256:5057451e461dda671da5e951019ddbff9d96a751fc7d548053523ca1f848c1ad 1.41kB / 1.41kB 0.0s
=> => sha256:75a7ebf15c39feb30c0444c1ab8d585fe490c35dca30c337e06b73c55fb0e30f 739B / 739B 0.0s
=> => sha256:c3144a54094d9628d01573952dfc7b580a76f2a3570f72b8900df676a697c1bb 6.98kB / 6.98kB 0.0s
=> => extracting sha256:f07e4bcf42b862c240f4c00f2f7ed362d7d93ca15151de547beda593f3b669e5 0.1s
=> => extracting sha256:078902f02c3a797288251014301298bd748886eaf5fc107e128cc1b4933ec57d 0.3s
=> [2/2] WORKDIR /usr/share/nginx/html 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:8fc6b719b70ed34467487519cca45523b18eb6f394187d50b08f5157b495efe4 0.0s
=> => naming to docker.io/sangam14/onbuild-dockerfile 0.0sFrom sangam14/onbuild-dockerfile
COPY index.html .
docker run -p 80:80 sangam14/onbuild-dockerfile
docker build -t sangam14/onbuild1-dockerfile -f dockerfile.onbuild1 .
[+] Building 0.1s (8/8) FINISHED
=> [internal] load build definition from dockerfile.onbuild1 0.0s
=> => transferring dockerfile: 107B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/sangam14/onbuild-dockerfile:latest 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 32B 0.0s
=> [1/2] FROM docker.io/sangam14/onbuild-dockerfile 0.0s
=> [2/2] COPY index.html . 0.0s
=> [3/2] COPY index.html . 0.0s
=> exporting to image 0.0s
=> => exporting layers 0.0s
=> => writing image sha256:c2291a76ea7cf76b5449ad476d47880b3c5b1bf0119cf7d1fe54111f88db2157 0.0s
=> => naming to docker.io/sangam14/onbuild1-dockerfile above container copied index.html form local
docker run -p 80:80 sangam14/onbuild1-dockerfile