http://steinim.github.io/slides/devopscon/zero-downtime-ansible
#!/bin/bash
if $( command -v vim >/dev/null 2>&1 ); then
echo "vim is already installed."
else
apt-get install vim
fi
if $( grep -Fxq "filetype indent off" /etc/vim/vimrc ); then
echo "set filetype indent off is already in /etc/vim/vimrc."
else
echo "filetype indent off" >> /etc/vim/vimrc
# TODO: Do not continue if this fails.
fi
# TODO: Rollback if something fails.
- name: ensure installed vim
apt: pkg=vim state=installed
- name: set filetype indent off for vim
lineinfile:
dest=/etc/vim/vimrc
line='filetype indent off'
state=present
vagrant up
├── ansible.cfg
├── hosts
├── site.yml
├── group_vars
│ └── <group name>
├── host_vars
│ └── <host name>
├── roles
│ ├── <role>
│ │ ├── files
│ │ └── <file>
│ │ └── templates
│ │ └── <template>.j2
│ │ ├── handlers
│ │ │ └── main.yml
│ │ ├── tasks
│ │ │ └── main.yml
│ │ ├── vars
│ │ │ └── main.yml
ansible-playbook site.yml
ansible -m setup app1.local
git checkout start
Help: http://docs.ansible.com/apt_module.html http://docs.ansible.com/lineinfile_module.html
git checkout task1_help
git diff HEAD origin/task1
git checkout task1 # or keep your own solution
ansible-playbook site.yml --tags vim
ProTip: Use '--tags', '--skip-tags', '--limit' and/or 'gather_facts: False'
to reduce execution time.
Help: http://docs.ansible.com/group_module.html http://docs.ansible.com/user_module.html http://docs.ansible.com/file_module.html (copy ssh-key) http://docs.ansible.com/lineinfile_module.html (.ssh/authorized_keys) http://docs.ansible.com/playbooks_best_practices.html#group-and-host-variables
git checkout task2_help
git diff HEAD origin/task2
git checkout task2 # or keep your own solution
ansible-playbook site.yml --limit appservers --skip-tags apt,vim,java
ssh devops@app1.local
roles/postgresql
├── files
│ ├── ACCC4CF8.asc
│ └── postgresql.conf
├── handlers
│ └── main.yml
├── tasks
│ ├── main.yml
│ └── ...
└── templates
└── pg_hba.conf.j2
Use variables (group_vars/all and/or group_vars/dbservers).
Use handler to restart postgresql upon notification
Template: git checkout master -- roles/postgresql/templates/pg_hba.conf.j2
Help: http://docs.ansible.com/template_module.html (pg_hba.conf.j2) http://docs.ansible.com/postgresql_user_module.html http://docs.ansible.com/postgresql_db_module.html http://docs.ansible.com/playbooks_intro.html#handlers-running-operations-on-change http://docs.ansible.com/playbooks_best_practices.html#group-and-host-variables
git diff HEAD origin/task3
git checkout task3 # or keep your own solution
ansible-playbook site.yml --limit dbservers --tags pg_install
$ vagrant ssh db
vagrant@db:~$ psql -d devops -U devops -W
devops=> \q
roles/app
├── files
│ └── init.sh
├── tasks
│ └── main.yml
└── templates
└── config.properties.j2
NB! Use variables (./hosts).
Set 'serial: 1' for appservers in site.yml.
Help: http://docs.ansible.com/service_module.html
git diff HEAD origin/task4
git checkout task4 # or keep your own solution
ansible-playbook site.yml --limit appservers --tags deploy
/home/devops
├── config.properties
├── current -> /home/devops/devops_1416228023.jar
├── previous -> /home/devops/devops_1416221573.jar
├── devops_1416221573.jar
├── devops_1416228023.jar
└── logs
├── stderr.log
└── stdout.log
/etc/init.d
└── devops
roles/db
├── files
│ └── migrate_db.sql
└── tasks
└── main.yml
Help: http://docs.ansible.com/command_module.html
psql -d {{ db.name }} -q -f /tmp/migrate_db.sql
sudo_user: postgres
git diff HEAD origin/task5
git checkout task5 # or keep your own solution
ansible-playbook site.yml --limit dbservers --tags deploy
$ vagrant ssh db
vagrant@db:~$ psql -d devops -U devops -W
devops=> \dt
devops=> select * from hello;
devops=> \q
roles/nginx
├── handlers
│ └── main.yml
├── tasks
│ ├── config_nginx.yml
│ ├── install_nginx.yml
│ └── main.yml
└── templates
└── devops.conf.j2
Help: http://wsgiarea.pocoo.org/jinja/docs/loops.html
git diff HEAD origin/task6
git checkout task6 # or keep your own solution
ansible-playbook site.yml --limit proxies --tags nginx
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