automation/deployer/README.md
2020-09-23 12:45:03 +02:00

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# Deployer: deploy your shit and make it run
So lame to have to configure nginx, MySQL, and your filesystem to install a stupid Wordpress instance.
**Deployer** does my config for me like the slave it is.
All the configuration is defined in `group_vars/all/vars.yml`, go check.
Create a side `group_vars/all/vault.yml` for your secrets, and encrypt it with Ansible Vault:
```bash
ansible-vault encrypt group_vars/all/vault.yml
# other sub-commands: edit, decrypt...
```
I usually run the following command:
ansible-playbook --ask-vault-pass sites.yml -i inventory -v
## Required packages on remote
Python modules:
* docker
* docker-compose
* pymysql
* psycopg2
TODO: Ansible task to install that before the rest
## Features
* Creating Wordpress instances (yoohoo, da best)
* That send mail!!11!1!
* Supports existing and new installs
* Creating Drupal instances
* Only existing ones (no new installs)
* Create Gitea instances
* Nginx and docker-compose configurations
* Most of the work is by hand, because there is quite a lot of interaction between the host and the container (for forwarding ssh).
* Create Synapse instances
* Configured to access PostGreSQL on host.
* *Access through TCP*: You need to allow postgres to listen to your docker network, e.g. `172.27.0.0/16`. See `/etc/postgresql/x.y/main/pg_hba.conf`, and read the comments about changing `listen_addresses` too.
* Access through Unix socket: Make a non-superuser role for root, and configure Synapse to use `/var/run/postgresql` as DB host.
### Does not support
* Setting up the host
* SSL certificate creation (bro, do it yourself!). That is:
```bash
# Make an nginx file for certbot
cat << EOF > /etc/nginx/sites-enabled/yoursite.com
server {
listen 80;
server_name www.yoursite.com yoursite.com;
include snippets/letsencrypt.conf;
}
EOF
nginx -t # Is everything alright?
# If so, restart nginx
service nginx restart
# Create the certificate
certbot certonly --webroot -w /var/www/letsencrypt -d yoursite.com -d www.yoursite.com
# Remove the stupid file
rm /etc/nginx/sites-enabled/yoursite.com
service nginx restart
```
## Misc
### Creating and rotating backups using `logrotate`
This is quite cool because `logrotate` manages rotation/deletion of 'log' files very well, so why not use it to rotate backup archives?
One can also add `prerotate`/`postrotate` scripts to a `logrotate` block, which allows to create the backups using `logrotate` too! (This way, there is only one utility taking care of the full backup creation/rotation/deletion process.)
A problem is that **`logrotate` blocks won't run if the block's file does not exist**. So, if you create a block like so:
/path/to/backup/dir/db-backup.sql.gz {
prerotate
# create the backup file
endscript
weekly
missingok
nocompress
nocreate
}
This block will never run unless `/path/to/backup/dir/db-backup.sql.gz` exists. This is why `roles/build/tasks/backup.yml` creates an empty backup file while defining the logrotate entry.
### Synapse
Someone advised me to install matrix-media-repo to enable animated thumbnails as people's avatar (https://github.com/turt2live/matrix-media-repo/blob/master/config.sample.yaml#L394), and to setup https://github.com/ma1uta/ma1sd which is a federated identity server.
### NextCloud
Steps to dockerization:
* Check the databases
* Modify character set to utf8mb4 / collate utf8mb4_general_ci.
ALTER DATABASE owncloud CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
* Change the default for the whole server while at it:
SET character_set_server = 'utf8mb4';
SET collation_server = 'utf8mb4_general_ci';
* Backup:
# Database
mysqldump -u root -R owncloud > /vault/backups/owncloud.sql
# Data (exclude './data' folder which is too big):
tar --exclude='./data' -czvf /vault/backups/nextcloud.tar.gz /var/www/nextcloud
Apparently this is needed, but since I'm using a single MariaDB for every service, I won't bother changing the global config:
* “READ COMMITED” transaction isolation level (See: Database “READ COMMITTED” transaction isolation level)
* Disabled or BINLOG_FORMAT = ROW configured Binary Logging (See: https://dev.mysql.com/doc/refman/5.7/en/binary-log-formats.html)
* For Emoji (UTF8 4-byte) support see Enabling MySQL 4-byte support
### Ansible
* You can create passwords/keys in templates using the following Jinja2 command:
{{ lookup('password', '/dev/null length=20') }}
See https://docs.ansible.com/ansible/latest/plugins/lookup/password.html and https://docs.ansible.com/ansible/latest/user_guide/playbooks_lookups.html
### Useful MySQL commands
```sql
select host, user, password from mysql.user order by user;
create user 'arvuhez'@'172.26.0.2' identified by 'kjhs';
grant all on arvuhez.* to 'arvuhez'@'172.26.0.2';
show grants for 'arvuhez'@'172.26.0.2';
```