How to import existing DOCKERFILE into ansible-container
By Vikrant
September 15, 2017
In this post I am showing the procedure to import existing DOCKERFILE into the ansible-container.
Step 1 : Created directory /root/ANSIBLE-CONTAINER-PROJECTS/project1/DOCKERFILE and added the following files into that directory.
[root@devops DOCKERFILE]# cat Dockerfile
FROM centos:7
MAINTAINER The CentOS Project <cloud-ops@centos.org>
LABEL Vendor="CentOS" \
License=GPLv2 \
Version=2.4.6-40
RUN yum -y --setopt=tsflags=nodocs update && \
yum -y --setopt=tsflags=nodocs install httpd && \
yum clean all
EXPOSE 80
# Simple startup script to avoid some issues observed with container restart
ADD run-httpd.sh /run-httpd.sh
RUN chmod -v +x /run-httpd.sh
CMD ["/run-httpd.sh"]
[root@devops DOCKERFILE]# cat run-httpd.sh
#!/bin/bash
# Make sure we're not confused by old, incompletely-shutdown httpd
# context after restarting the container. httpd won't start correctly
# if it thinks it is already running.
rm -rf /run/httpd/* /tmp/httpd*
exec /usr/sbin/apachectl -DFOREGROUND
I downloaded this from [1].
Step 2 : Start importing the project into the ansible-container. We just need to give the name of directory in which Dockerfile and script is present.
[root@devops ANSIBLE-CONTAINER-PROJECTS]# cd project1/
[root@devops project1]# ls
DOCKERFILE
[root@devops project1]# ansible-container import DOCKERFILE
Project successfully imported. You can find the results in:
/root/ANSIBLE-CONTAINER-PROJECTS/project1
A brief description of what you will find...
container.yml
-------------
The container.yml file is your orchestration file that expresses what services you have and how to build/run them.
settings:
conductor_base: centos:7
services:
DOCKERFILE:
roles:
- DOCKERFILE
I added a single service named DOCKERFILE for your imported Dockerfile.
As you can see, I made an Ansible role for your service, which you can find in:
`/root/ANSIBLE-CONTAINER-PROJECTS/project1/roles/DOCKERFILE`
project1/roles/DOCKERFILE/tasks/main.yml
----------------------------------------
The tasks/main.yml file has your RUN/ADD/COPY instructions.
- shell: yum -y --setopt=tsflags=nodocs update
- shell: yum -y --setopt=tsflags=nodocs install httpd
- shell: yum clean all
- name: Ensure / exists
file:
path: /
state: directory
- name: Simple startup script to avoid some issues observed with container restart
(run-httpd.sh)
copy:
src: run-httpd.sh
dest: /run-httpd.sh
- shell: chmod -v +x /run-httpd.sh
I tried to preserve comments as task names, but you probably want to make
sure each task has a human readable name.
project1/roles/DOCKERFILE/meta/container.yml
--------------------------------------------
Metadata from your Dockerfile went into meta/container.yml in your role.
These will be used as build/run defaults for your role.
from: centos:7
maintainer: The CentOS Project <cloud-ops@centos.org>
labels:
Vendor: CentOS
License: GPLv2
Version: 2.4.6-40
ports:
- '80'
command:
- /run-httpd.sh
I also stored ARG directives in the role's defaults/main.yml which will used as
variables by Ansible in your build and run operations.
Good luck!
Project imported.
Step 3 : Our project is imported, after importing the project here is the directory structure.
[root@devops project1]# ls
container.yml DOCKERFILE roles run-httpd.sh
It contains container.yaml file, roles directory and run-httpd.sh script.
container.yaml is using centos7 as base image and calling role DOCKERFILE.
[root@devops project1]# cat container.yml
settings:
conductor_base: centos:7
services:
DOCKERFILE:
roles:
- DOCKERFILE
roles directory contains DOCKERFILE role. It shows all the tasks which it will run when the build process is triggered.
[root@devops project1]# cd roles/
[root@devops roles]# ls
DOCKERFILE
[root@devops roles]# cd DOCKERFILE/
[root@devops DOCKERFILE]# ls
defaults meta README.md tasks test
[root@devops DOCKERFILE]# cat tasks/main.yml
- shell: yum -y --setopt=tsflags=nodocs update
- shell: yum -y --setopt=tsflags=nodocs install httpd
- shell: yum clean all
- name: Ensure / exists
file:
path: /
state: directory
- name: Simple startup script to avoid some issues observed with container restart
(run-httpd.sh)
copy:
src: run-httpd.sh
dest: /run-httpd.sh
- shell: chmod -v +x /run-httpd.sh
[root@devops DOCKERFILE]# cat meta/
container.yml main.yml
[root@devops DOCKERFILE]# cat meta/
container.yml main.yml
[root@devops DOCKERFILE]# cat meta/container.yml
from: centos:7
maintainer: The CentOS Project <cloud-ops@centos.org>
labels:
Vendor: CentOS
License: GPLv2
Version: 2.4.6-40
ports:
- '80'
command:
- /run-httpd.sh
Step 4 : Initiating the ansible-container build will show all the tasks it’s running which is present in role.
[root@devops project1]# ansible-container build
Building Docker Engine context...
Starting Docker build of Ansible Container Conductor image (please be patient)...
Parsing conductor CLI args.
Docker™ daemon integration engine loaded. Build starting. project=project1
Building service... project=project1 service=DOCKERFILE
PLAY [DOCKERFILE] **************************************************************
TASK [Gathering Facts] *********************************************************
ok: [DOCKERFILE]
TASK [DOCKERFILE : command] ****************************************************
[WARNING]: Consider using yum module rather than running yum
changed: [DOCKERFILE]
TASK [DOCKERFILE : command] ****************************************************
changed: [DOCKERFILE]
TASK [DOCKERFILE : command] ****************************************************
changed: [DOCKERFILE]
TASK [DOCKERFILE : Ensure / exists] ********************************************
ok: [DOCKERFILE]
TASK [DOCKERFILE : Simple startup script to avoid some issues observed with container restart (run-httpd.sh)] ***
changed: [DOCKERFILE]
TASK [DOCKERFILE : command] ****************************************************
[WARNING]: Consider using file module with mode rather than running chmod
changed: [DOCKERFILE]
PLAY RECAP *********************************************************************
DOCKERFILE : ok=7 changed=5 unreachable=0 failed=0
Applied role to service role=DOCKERFILE service=DOCKERFILE
Committed layer as image image=sha256:9200752cbe499023de2c755e7ee790a51e36cca3b8b11c48a3609b2e7436d429 service=DOCKERFILE
Build complete. service=DOCKERFILE
All images successfully built.
Conductor terminated. Cleaning up. command_rc=0 conductor_id=841adaf51d887a1f2abc56a9f01996573c7074c8b217ae3113ae4fbc693a1c0e save_container=False
Build will create a new directory inside the directory.
[root@devops project1]# ls
ansible-deployment container.yml DOCKERFILE roles run-httpd.sh
Step 5 : Following are the images present after the build complete.
[root@devops project1]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
project1-dockerfile 20170826195807 9200752cbe49 3 minutes ago 244.9 MB
project1-dockerfile latest 9200752cbe49 3 minutes ago 244.9 MB
project1-conductor latest e499184e44d8 5 minutes ago 549.1 MB
docker.io/centos 7 328edcd84f1b 3 weeks ago 192.5 MB
Checking the history of images created during build process. centos:7 is the base image which is used for build process.
All the tasks ran on conductor image.
[root@devops DOCKERFILE]# docker history project1-conductor:latest
IMAGE CREATED CREATED BY SIZE COMMENT
e499184e44d8 20 minutes ago /bin/sh -c #(nop) VOLUME [/usr] 0 B
012c53305347 20 minutes ago /bin/sh -c ( test -f /_ansible/build/ansible- 0 B
8068be3c5409 20 minutes ago /bin/sh -c #(nop) COPY dir:9695e7c3619885b00d 0 B
d6dca564d2ae 20 minutes ago /bin/sh -c cd /_ansible && pip install -r 109.1 MB
382321fc6a20 23 minutes ago /bin/sh -c #(nop) COPY dir:44abffe3306d203510 3.645 MB
d4031cbc2a95 23 minutes ago /bin/sh -c python /get-pip.py && mkdir -p 93.07 MB
b9ad4b07a63b 23 minutes ago /bin/sh -c #(nop) COPY file:7d575017b1192e86d 1.595 MB
fc8a7163d23f 24 minutes ago /bin/sh -c #(nop) ADD tarsum.v1+sha256:ee0f28 26.51 MB
1b7d7763d224 24 minutes ago /bin/sh -c yum update -y && yum install - 122.7 MB
392230f5245d 26 minutes ago /bin/sh -c #(nop) ENV ANSIBLE_CONTAINER=1 0 B
328edcd84f1b 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
<missing> 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Ima 0 B
<missing> 3 weeks ago /bin/sh -c #(nop) ADD file:63492ba809361c51e7 192.5 MB
[root@devops DOCKERFILE]# docker history project1-dockerfile:latest
IMAGE CREATED CREATED BY SIZE COMMENT
9200752cbe49 18 minutes ago sh -c while true; do sleep 1; done 52.36 MB Built with Ansible Container (https://github.com/ansible/ansible-container)
328edcd84f1b 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
<missing> 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Ima 0 B
<missing> 3 weeks ago /bin/sh -c #(nop) ADD file:63492ba809361c51e7 192.5 MB
[root@devops DOCKERFILE]# docker history project1-dockerfile:20170826195807
IMAGE CREATED CREATED BY SIZE COMMENT
9200752cbe49 18 minutes ago sh -c while true; do sleep 1; done 52.36 MB Built with Ansible Container (https://github.com/ansible/ansible-container)
328edcd84f1b 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/bash"] 0 B
<missing> 3 weeks ago /bin/sh -c #(nop) LABEL name=CentOS Base Ima 0 B
<missing> 3 weeks ago /bin/sh -c #(nop) ADD file:63492ba809361c51e7 192.5 MB
Step 6 : Running ansible-container.
[root@devops project1]# ansible-container run
Parsing conductor CLI args.
Engine integration loaded. Preparing run. engine=Docker™ daemon
Verifying service image service=DOCKERFILE
PLAY [localhost] ***************************************************************
TASK [docker_service] **********************************************************
changed: [localhost]
PLAY RECAP *********************************************************************
localhost : ok=1 changed=1 unreachable=0 failed=0
All services running. playbook_rc=0
Conductor terminated. Cleaning up. command_rc=0 conductor_id=947b2b03ead6fc6981b8ff5f2b8b0364c76d665dae041c1dedc61b0e6f159462 save_container=False
Step 7 : A new container we can see which is having port 80 mapped to the host port 32769
[root@devops project1]# docker ps -a --no-trunc
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a897fc299fcdce5904dcbebf75bce565681c6155253c317613a96374edec2b32 project1-dockerfile:20170826195807 "/run-httpd.sh" 43 seconds ago Up 42 seconds 0.0.0.0:32769->80/tcp project1_DOCKERFILE_1
Using the host ip address and port number 32769, we can access the apache web page.
[1] https://github.com/CentOS/CentOS-Dockerfiles/blob/master/httpd/centos7/run-httpd.sh