Docker is used to build and manage linux containers. Ansible is useful in managing the Docker container lifecycle.
This Vagrant profile uses Ansible to configure a local VM with Docker, then it uses Ansible to build and run 6 containers:
redis: a cluster of 2 redis containers (with persistence)rabbitmq: a cluster of 2 rabbitmq containers (with persistence)mysql: a Mysql master-slave replication (with persistence)
Vagrant --> Provision VM --> Execute ansible (main.yml) --> [ build docker containers --> start docker containers ]
.
├── README.md
├── Vagrantfile
├── provisioning
│ ├── containers.yml
│ ├── main.yml
│ ├── mysql
│ │ ├── Dockerfile
│ │ └── core
│ │ ├── init-slave.sh
│ │ └── replication-entrypoint.sh
│ ├── mysql.yml
│ ├── rabbitmq
│ │ ├── Dockerfile
│ │ └── joinmaster.sh
│ ├── rabbitmq.yml
│ ├── redis
│ │ └── Dockerfile
│ ├── redis.yml
│ └── setup.yml
└── requirements.yml
main.yml
---
- hosts: all
become: true
pre_tasks:
- name: Update apt cache if needed.
apt: update_cache=yes cache_valid_time=3600
roles:
- role: geerlingguy.docker
tasks:
- import_tasks: setup.yml #Install some pip requirements
- import_tasks: containers.yml #playbook for building the containers
- import_tasks: redis.yml
- import_tasks: rabbitmq.yml
- import_tasks: mysql.yml
This README file is inside a folder that contains a Vagrantfile (hereafter this folder shall be called the [vagrant_root]), which tells Vagrant how to set up your virtual machine in VirtualBox.
To use the vagrant file, you will need to have done the following:
git clonethis repo- Download and Install VirtualBox
- Download and Install Vagrant
- Install Ansible
- Run the following command to install the necessary Ansible roles for this profile:
$ ansible-galaxy install -r requirements.yml
Once all of that is done, you can simply type in vagrant up, and Vagrant will create a new VM, install the base box, and configure it.
Once the new VM is up and running (after vagrant up --provision is complete and you're back at the command prompt), you can log into it via SSH if you'd like by typing in vagrant ssh default.
root@docker:~# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
b4e90c9926b0 mysql "/usr/local/bin/repl…" 7 minutes ago Up 7 minutes 3306/tcp, 33060/tcp mysql_slave
3b203009fbca mysql "/usr/local/bin/repl…" 7 minutes ago Up 7 minutes 0.0.0.0:3306->3306/tcp, 33060/tcp mysql_master
8ca8dc4bbd97 rabbitmq "docker-entrypoint.s…" 8 minutes ago Up 8 minutes 5671/tcp, 15671/tcp, 0.0.0.0:4370->4369/tcp, 0.0.0.0:5673->5672/tcp, 0.0.0.0:15673->15672/tcp, 0.0.0.0:25673->25672/tcp, 0.0.0.0:35673->35672/tcp rabbitmq-slave
1153998655be rabbitmq "docker-entrypoint.s…" 8 minutes ago Up 8 minutes 0.0.0.0:4369->4369/tcp, 5671/tcp, 0.0.0.0:5672->5672/tcp, 0.0.0.0:15672->15672/tcp, 0.0.0.0:25672->25672/tcp, 0.0.0.0:35672->35672/tcp, 15671/tcp rabbitmq-master
5ea149aa1955 redis:latest "docker-entrypoint.s…" 8 minutes ago Up 8 minutes 6379/tcp redis-slave
f9f8bdbaa387 redis:latest "docker-entrypoint.s…" 8 minutes ago Up 8 minutes 0.0.0.0:6379->6379/tcp redis-master
Redis
root@docker:~# docker exec -it redis-slave redis-cli -h localhost info| grep -A3 Replication
# Replication
role:slave
master_host:redis-master
master_port:6379
RabbitMQ
credentials are maintained into the Vagrantfile: ansible.extra_vars
root@docker:~# docker exec -it rabbitmq-01 rabbitmqctl cluster_status
Cluster status of node rabbit@rabbitmq-01 ...
[{nodes,[{disc,['rabbit@rabbitmq-01','rabbit@rabbitmq-02']}]},
{running_nodes,['rabbit@rabbitmq-02','rabbit@rabbitmq-01']},
{cluster_name,<<"rabbit@rabbitmq-01">>},
{partitions,[]},
{alarms,[{'rabbit@rabbitmq-02',[]},{'rabbit@rabbitmq-01',[]}]}]
Management RabbitMQ
root@docker:~# curl -I http://localhost:15672
HTTP/1.1 200 OK
content-length: 1391
content-type: text/html
date: Mon, 17 Feb 2020 01:15:15 GMT
etag: "821408888"
last-modified: Mon, 17 Feb 2020 00:59:21 GMT
server: Cowboy
Mysql
root@docker:~# docker exec -it mysql_slave mysql -uroot -pmysqlroot -e "SHOW SLAVE STATUS\G;"
mysql: [Warning] Using a password on the command line interface can be insecure.
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: mysql_master
Master_User: replication_user
Master_Port: 3306
Connect_Retry: 60
Persistence
root@docker:~# tree -d /data/ -L 2
/data/
├── mysql
│ ├── master
│ └── slave
├── rabbitmq
│ ├── 1
│ └── 2
└── redis
├── master
└── slave
You can extend the docker images (or add more functionality) by editing the Dockerfile in every service folder. The ansible playbook builds the docker image everytime time is executed
wait_for ansible control should be fixed. It doesn't work nice in 2.9.5 running in MacOs
Ports can be forwarded to the host config.vm.network "forwarded_port"
All docker containers are deployed into a single VM. You can provision a VM per service by adapting the Vagranfile and the main.yml playbook