How to add ansible service in alpine image

Use apk add ansible to add the ansible service to the alpine image.

Add Steps

Using Ansible in Alpine requires the following steps

Dockerfile

Add the above statement in Dockerfile:

#update apk for install
RUN apk update
#install ansible and openssh
RUN apk add ansible openssh
#init ansible hosts file
RUN mkdir -p /etc/ansible
RUN echo "localhost" >/etc/ansible/hosts
#init rsa ssh key pair
RUN ssh-keygen -t rsa -P "" -f ~/.ssh/id_rsa
#delete cache files 
RUN rm -rf /var/cache/apk/*

Using Mirror

Pull the image

About 103M

[root@occluster ~]# docker pull liumiaocn/ansible
Using default tag: latest
Trying to pull repository docker.io/liumiaocn/ansible ... 
latest: Pulling from docker.io/liumiaocn/ansible
ff3a5c916c92: Already exists 
42a81541f983: Pull complete 
86602ac17bcb: Pull complete 
73cb14e49a3f: Pull complete 
bdfcad59d746: Pull complete 
455ffeaa5bf1: Pull complete 
dff32643cfa5: Pull complete 
Digest: sha256:46284f3d3b9e3880f9b65fa6b1fb225b19bc88222badf74aa85936aabc24090f
Status: Downloaded newer image for docker.io/liumiaocn/ansible:latest
[root@occluster ~]# 
[root@occluster ~]# docker images |grep ansible
docker.io/liumiaocn/ansible latest 8a5cfdf8243f Less than a second ago 103 MB
[root@occluster ~]#

use

Confirm the version

[root@occluster ~]# docker run -it --name ansible liumiaocn/ansible sh
/ # ansible --version
ansible 2.4.1.0
 config file = None
 configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
 ansible python module location = /usr/lib/python2.7/site-packages/ansible
 executable location = /usr/bin/ansible
 python version = 2.7.14 (default, Dec 14 2017, 15:51:29) [GCC 6.4.0]
/ #

To communicate with the host (192.168.163.172), set up the ssh channel in advance and use ssh-copy-id

/#ssh-copy-id 192.168.163.172
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host '192.168.163.172 (192.168.163.172)' can't be established.
ECDSA key fingerprint is SHA256:uh84Xw56LhiCXb1b0uFbX/CoFhkqHGZjtmLwl3qkTOY.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
expr: warning: '^ERROR: ': using '^' as the first character
of a basic regular expression is not portable; it is ignored
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
[email protected]'s password: 
Number of key(s) added: 1
Now try logging into the machine, with: "ssh '192.168.163.172'"
and check to make sure that only the key(s) you wanted were added.
/ #

SSH access confirmation

/#ssh 192.168.163.172 hostname
occluster
/ #

ansible action confirmation

/ # echo "192.168.163.172" >>/etc/ansible/hosts
/ # ansible 192.168.163.172 -m ping
192.168.163.172 | SUCCESS => {
  "changed": false, 
  "failed": false, 
  "ping": "pong"
}
/ #

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