forked from ungleich-public/cdist
Add 'real world example' walkthrough docs chapter.
This commit is contained in:
Darko Poljak
parent
aa80e8f87d
commit
d6952543a7
3 changed files with 575 additions and 0 deletions
|
|
@ -5,6 +5,7 @@ next:
|
||||||
* New global explorer: os_release (Ľubomír Kučera)
|
* New global explorer: os_release (Ľubomír Kučera)
|
||||||
* Type __docker: Update type, install docker CE (Ľubomír Kučera)
|
* Type __docker: Update type, install docker CE (Ľubomír Kučera)
|
||||||
* Type __package_apt: Write a message when a package is installed or removed; shellcheck (Jonas Weber)
|
* Type __package_apt: Write a message when a package is installed or removed; shellcheck (Jonas Weber)
|
||||||
|
* Documentation: Add 'Dive into real world cdist' walkthrough chapter (Darko Poljak)
|
||||||
|
|
||||||
4.10.2: 2018-09-06
|
4.10.2: 2018-09-06
|
||||||
* Type __letsencrypt_cert: Add support for devuan ascii (Darko Poljak)
|
* Type __letsencrypt_cert: Add support for devuan ascii (Darko Poljak)
|
||||||
|
|
|
||||||
573
docs/src/cdist-real-world.rst
Normal file
573
docs/src/cdist-real-world.rst
Normal file
|
|
@ -0,0 +1,573 @@
|
||||||
|
Dive into real world cdist
|
||||||
|
==========================
|
||||||
|
|
||||||
|
Introduction
|
||||||
|
------------
|
||||||
|
|
||||||
|
This walkthrough shows real world cdist configuration example.
|
||||||
|
|
||||||
|
Sample target host is named **test.ungleich.ch**.
|
||||||
|
Just replace **test.ungleich.ch** with your target hostname.
|
||||||
|
|
||||||
|
Our goal is to configure python application hosting. For writing sample
|
||||||
|
application we will use `Bottle <http://bottlepy.org>`_ WSGI micro web-framework.
|
||||||
|
It will use PostgreSQL database and it will list items from **items** table.
|
||||||
|
It will be served by uWSGI server. We will also use the Nginx web server
|
||||||
|
as a reverse proxy and we want HTTPS.
|
||||||
|
For HTTPS we will use Let's Encrypt certificate.
|
||||||
|
|
||||||
|
For setting up hosting we want to use cdist so we will write a new type
|
||||||
|
for that. This type will:
|
||||||
|
|
||||||
|
- install required packages
|
||||||
|
- create OS user, user home directory and application home directory
|
||||||
|
- create PostgreSQL database
|
||||||
|
- configure uWSGI
|
||||||
|
- configure Let's Encrypt certificate
|
||||||
|
- configure nginx.
|
||||||
|
|
||||||
|
Our type will not create the actual python application. Its intention is only
|
||||||
|
to configure hosing for specified user and project. It is up to the user to
|
||||||
|
create his/her applications.
|
||||||
|
|
||||||
|
So let's start.
|
||||||
|
|
||||||
|
Creating type layout
|
||||||
|
--------------------
|
||||||
|
|
||||||
|
We will create a new custom type. Let's call it **__sample_bottle_hosting**.
|
||||||
|
|
||||||
|
Go to **~/.cdist/type** directory (create it if it does not exist) and create
|
||||||
|
new type layout::
|
||||||
|
|
||||||
|
cd ~/.cdist/type
|
||||||
|
mkdir __sample_bottle_hosting
|
||||||
|
cd __sample_bottle_hosting
|
||||||
|
touch manifest gencode-remote
|
||||||
|
mkdir parameter
|
||||||
|
touch parameter/required
|
||||||
|
|
||||||
|
Creating __sample_bottle_hosting type parameters
|
||||||
|
------------------------------------------------
|
||||||
|
|
||||||
|
Our type will be configurable through the means of parameters. Let's define
|
||||||
|
the following parameters:
|
||||||
|
|
||||||
|
projectname
|
||||||
|
name for the project, needed for uWSGI ini file
|
||||||
|
|
||||||
|
user
|
||||||
|
user name
|
||||||
|
|
||||||
|
domain
|
||||||
|
target host domain, needed for Let's Encrypt certificate.
|
||||||
|
|
||||||
|
We define parameters to make our type reusable for different projects, user and domain.
|
||||||
|
|
||||||
|
Define required parameters::
|
||||||
|
|
||||||
|
printf "projectname\n" >> parameter/required
|
||||||
|
printf "user\n" >> parameter/required
|
||||||
|
printf "domain\n" >> parameter/required
|
||||||
|
|
||||||
|
For details on type parameters see `Defining parameters <cdist-type.html#defining-parameters>`_.
|
||||||
|
|
||||||
|
Creating __sample_bottle_hosting type manifest
|
||||||
|
----------------------------------------------
|
||||||
|
|
||||||
|
Next step is to define manifest (~/.cdist/type/__sample_bottle_hosting/manifest).
|
||||||
|
We also want our type to currently support only Devuan. So we will start by
|
||||||
|
checking target host OS. We will use `os <cdist-reference.html#explorers>`_
|
||||||
|
global explorer::
|
||||||
|
|
||||||
|
os=$(cat "$__global/explorer/os")
|
||||||
|
|
||||||
|
case "$os" in
|
||||||
|
devuan)
|
||||||
|
:
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
echo "OS $os currently not supported" >&2
|
||||||
|
exit 1
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
If target host OS is not Devuan then we print error message to stderr
|
||||||
|
and exit. For other OS-es support we should check and change package names
|
||||||
|
we should install, because packages differ in different OS-es and in different
|
||||||
|
OS distributions like GNU/Linux distributions. There can also be a different
|
||||||
|
configuration locations (e.g. nginx config directory could be in /usr/local tree).
|
||||||
|
If we detected unsupported OS we should error out. cdist will stop configuration
|
||||||
|
process and output error message.
|
||||||
|
|
||||||
|
Creating user and user directories
|
||||||
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Then we create user and his/her home directory and application home directory.
|
||||||
|
We will use existing cdist types `__user <man7/cdist-type__user.html>`_ and `__directory <man7/cdist-type__directory.html>`_::
|
||||||
|
|
||||||
|
user="$(cat "$__object/parameter/user")"
|
||||||
|
home="/home/$user"
|
||||||
|
apphome="$home/app"
|
||||||
|
|
||||||
|
# create user
|
||||||
|
__user "$user" --home "$home" --shell /bin/bash
|
||||||
|
# create user home dir
|
||||||
|
require="__user/$user" __directory "$home" \
|
||||||
|
--owner "$user" --group "$user" --mode 0755
|
||||||
|
# create app home dir
|
||||||
|
require="__user/$user __directory/$home" __directory "$apphome" \
|
||||||
|
--state present --owner "$user" --group "$user" --mode 0755
|
||||||
|
|
||||||
|
First we define *user*, *home* and *apphome* variables. User is defined by type's
|
||||||
|
**user** parameter. Here we use **require** which is cdist's way to define dependencies.
|
||||||
|
User home directory should be created **after** user is created. And application
|
||||||
|
home directory is created **after** both user and user home directory are created.
|
||||||
|
For details on **require** see `Dependencies <cdist-manifest.html#dependencies>`_.
|
||||||
|
|
||||||
|
Installing packages
|
||||||
|
~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Install required packages using existing `__package <man7/cdist-type__package.html>`_ type.
|
||||||
|
Before installing package we want to update apt package index using
|
||||||
|
`__apt_update_index <man7/cdist-type__apt_update_index.html>`_::
|
||||||
|
|
||||||
|
# define packages that need to be installed
|
||||||
|
packages_to_install="nginx uwsgi-plugin-python3 python3-dev python3-pip postgresql postgresql-contrib libpq-dev python3-venv uwsgi python3-psycopg2"
|
||||||
|
|
||||||
|
# update package index
|
||||||
|
__apt_update_index
|
||||||
|
# install packages
|
||||||
|
for package in $packages_to_install
|
||||||
|
do require="__apt_update_index" __package $package --state=present
|
||||||
|
done
|
||||||
|
|
||||||
|
Here we use shell for loop. It executes **require="__apt_update_index" __package**
|
||||||
|
for each member in a list we define in **packages_to_install** variable.
|
||||||
|
This is much nicer then having as many **require="__apt_update_index" __package**
|
||||||
|
lines as there are packages we want to install.
|
||||||
|
|
||||||
|
For python packages we use `__package_pip <man7/cdist-type__package_pip.html>`_::
|
||||||
|
|
||||||
|
# install pip3 packages
|
||||||
|
for package in bottle bottle-pgsql; do
|
||||||
|
__package_pip --pip pip3 $package
|
||||||
|
done
|
||||||
|
|
||||||
|
Creating PostgreSQL database
|
||||||
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Create PostgreSQL database using `__postgres_database <man7/cdist-type__postgres_database.html>`_
|
||||||
|
and `__postgres_role <man7/cdist-type__postgres_role.html>`_ for creating database user::
|
||||||
|
|
||||||
|
#PostgreSQL db & user
|
||||||
|
postgres_server=postgresql
|
||||||
|
|
||||||
|
# create PostgreSQL db user
|
||||||
|
require="__package/postgresql" __postgres_role $user --login --createdb
|
||||||
|
# create PostgreSQL db
|
||||||
|
require="__postgres_role/$user __package/postgresql" __postgres_database $user \
|
||||||
|
--owner $user
|
||||||
|
|
||||||
|
Configuring uWSGI
|
||||||
|
~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Configure uWSGI using `__file <man7/cdist-type__file.html>`_ type::
|
||||||
|
|
||||||
|
# configure uWSGI
|
||||||
|
projectname="$(cat "$__object/parameter/projectname")"
|
||||||
|
require="__package/uwsgi" __file /etc/uwsgi/apps-enabled/$user.ini \
|
||||||
|
--owner root --group root --mode 0644 \
|
||||||
|
--state present \
|
||||||
|
--source - << EOF
|
||||||
|
[uwsgi]
|
||||||
|
socket = $apphome/uwsgi.sock
|
||||||
|
chdir = $apphome
|
||||||
|
wsgi-file = $projectname/wsgi.py
|
||||||
|
touch-reload = $projectname/wsgi.py
|
||||||
|
processes = 4
|
||||||
|
threads = 2
|
||||||
|
chmod-socket = 666
|
||||||
|
daemonize=true
|
||||||
|
vacuum = true
|
||||||
|
uid = $user
|
||||||
|
gid = $user
|
||||||
|
EOF
|
||||||
|
|
||||||
|
We require package uWSGI present in order to create **/etc/uwsgi/apps-enabled/$user.ini** file.
|
||||||
|
Installation of uWSGI also creates configuration layout: **/etc/uwsgi/apps-enabled**.
|
||||||
|
If this directory does not exist then **__file** type would error.
|
||||||
|
We also use stdin as file content source. For details see `Input from stdin <cdist-type.html#input-from-stdin>`_.
|
||||||
|
For feading stdin we use here-document (**<<** operator). It allows redirection of subsequent
|
||||||
|
lines read by the shell to the input of a command until a line containing only the delimiter
|
||||||
|
and a newline, with no blank characters in between (EOF in our case).
|
||||||
|
|
||||||
|
Configuring nginx for Let's Encrypt and HTTPS redirection
|
||||||
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Next configure nginx for Let's Encrypt and for HTTP -> HTTPS redirection. For this
|
||||||
|
purpose we will create new type **__sample_nginx_http_letsencrypt_and_ssl_redirect**
|
||||||
|
and use it here::
|
||||||
|
|
||||||
|
domain="$(cat "$__object/parameter/domain")"
|
||||||
|
webroot="/var/www/html"
|
||||||
|
__sample_nginx_http_letsencrypt_and_ssl_redirect "$domain" --webroot "$webroot"
|
||||||
|
|
||||||
|
Configuring certificate creation
|
||||||
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
After HTTP nginx configuration we will create Let's Encrypt certificate using
|
||||||
|
`__letsencrypt_cert <man7/cdist-type__letsencrypt_cert.html>`_ type.
|
||||||
|
For Let's Encrypt cert configuration ensure that there is a DNS entry for your
|
||||||
|
domain. We assure that cert creation is applied after nginx HTTP is configured
|
||||||
|
for Let's Encrypt to work::
|
||||||
|
|
||||||
|
# create SSL cert
|
||||||
|
require="__package/nginx __sample_nginx_http_letsencrypt_and_ssl_redirect/$domain" \
|
||||||
|
__letsencrypt_cert --admin-email admin@test.ungleich.ch \
|
||||||
|
--webroot "$webroot" \
|
||||||
|
--automatic-renewal \
|
||||||
|
--renew-hook "service nginx reload" \
|
||||||
|
--domain "$domain" \
|
||||||
|
"$domain"
|
||||||
|
|
||||||
|
Configuring nginx HTTPS server with uWSGI upstream
|
||||||
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Then we can configure nginx HTTPS server that will use created Let's Encrypt certificate::
|
||||||
|
|
||||||
|
# configure nginx
|
||||||
|
require="__package/nginx __letsencrypt_cert/$domain" \
|
||||||
|
__file "/etc/nginx/sites-enabled/https-$domain" \
|
||||||
|
--source - --mode 0644 << EOF
|
||||||
|
upstream _bottle {
|
||||||
|
server unix:$apphome/uwsgi.sock;
|
||||||
|
}
|
||||||
|
|
||||||
|
server {
|
||||||
|
listen 443;
|
||||||
|
listen [::]:443;
|
||||||
|
|
||||||
|
server_name $domain;
|
||||||
|
|
||||||
|
access_log /var/log/nginx/access.log;
|
||||||
|
|
||||||
|
ssl on;
|
||||||
|
ssl_certificate /etc/letsencrypt/live/$domain/fullchain.pem;
|
||||||
|
ssl_certificate_key /etc/letsencrypt/live/$domain/privkey.pem;
|
||||||
|
|
||||||
|
client_max_body_size 256m;
|
||||||
|
|
||||||
|
location / {
|
||||||
|
try_files \$uri @uwsgi;
|
||||||
|
}
|
||||||
|
|
||||||
|
location @uwsgi {
|
||||||
|
include uwsgi_params;
|
||||||
|
uwsgi_pass _bottle;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
EOF
|
||||||
|
|
||||||
|
Now our manifest is finished.
|
||||||
|
|
||||||
|
Complete __sample_bottle_hosting type manifest listing
|
||||||
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Here is complete __sample_bottle_hosting type manifest listing,
|
||||||
|
located in ~/.cdist/type/__sample_bottle_hosting/manifest::
|
||||||
|
|
||||||
|
#!/bin/sh
|
||||||
|
|
||||||
|
os=$(cat "$__global/explorer/os")
|
||||||
|
|
||||||
|
case "$os" in
|
||||||
|
devuan)
|
||||||
|
:
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
echo "OS $os currently not supported" >&2
|
||||||
|
exit 1
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
projectname="$(cat "$__object/parameter/projectname")"
|
||||||
|
user="$(cat "$__object/parameter/user")"
|
||||||
|
home="/home/$user"
|
||||||
|
apphome="$home/app"
|
||||||
|
domain="$(cat "$__object/parameter/domain")"
|
||||||
|
|
||||||
|
# create user
|
||||||
|
__user "$user" --home "$home" --shell /bin/bash
|
||||||
|
# create user home dir
|
||||||
|
require="__user/$user" __directory "$home" \
|
||||||
|
--owner "$user" --group "$user" --mode 0755
|
||||||
|
# create app home dir
|
||||||
|
require="__user/$user __directory/$home" __directory "$apphome" \
|
||||||
|
--state present --owner "$user" --group "$user" --mode 0755
|
||||||
|
|
||||||
|
# define packages that need to be installed
|
||||||
|
packages_to_install="nginx uwsgi-plugin-python3 python3-dev python3-pip postgresql postgresql-contrib libpq-dev python3-venv uwsgi python3-psycopg2"
|
||||||
|
|
||||||
|
# update package index
|
||||||
|
__apt_update_index
|
||||||
|
# install packages
|
||||||
|
for package in $packages_to_install
|
||||||
|
do require="__apt_update_index" __package $package --state=present
|
||||||
|
done
|
||||||
|
# install pip3 packages
|
||||||
|
for package in bottle bottle-pgsql; do
|
||||||
|
__package_pip --pip pip3 $package
|
||||||
|
done
|
||||||
|
|
||||||
|
#PostgreSQL db & user
|
||||||
|
postgres_server=postgresql
|
||||||
|
|
||||||
|
# create PostgreSQL db user
|
||||||
|
require="__package/postgresql" __postgres_role $user --login --createdb
|
||||||
|
# create PostgreSQL db
|
||||||
|
require="__postgres_role/$user __package/postgresql" __postgres_database $user \
|
||||||
|
--owner $user
|
||||||
|
# configure uWSGI
|
||||||
|
require="__package/uwsgi" __file /etc/uwsgi/apps-enabled/$user.ini \
|
||||||
|
--owner root --group root --mode 0644 \
|
||||||
|
--state present \
|
||||||
|
--source - << EOF
|
||||||
|
[uwsgi]
|
||||||
|
socket = $apphome/uwsgi.sock
|
||||||
|
chdir = $apphome
|
||||||
|
wsgi-file = $projectname/wsgi.py
|
||||||
|
touch-reload = $projectname/wsgi.py
|
||||||
|
processes = 4
|
||||||
|
threads = 2
|
||||||
|
chmod-socket = 666
|
||||||
|
daemonize=true
|
||||||
|
vacuum = true
|
||||||
|
uid = $user
|
||||||
|
gid = $user
|
||||||
|
EOF
|
||||||
|
|
||||||
|
# setup nginx HTTP for Let's Encrypt and SSL redirect
|
||||||
|
domain="$(cat "$__object/parameter/domain")"
|
||||||
|
webroot="/var/www/html"
|
||||||
|
__sample_nginx_http_letsencrypt_and_ssl_redirect "$domain" --webroot "$webroot"
|
||||||
|
|
||||||
|
# create SSL cert
|
||||||
|
require="__package/nginx __sample_nginx_http_letsencrypt_and_ssl_redirect/$domain" \
|
||||||
|
__letsencrypt_cert --admin-email admin@test.ungleich.ch \
|
||||||
|
--webroot "$webroot" \
|
||||||
|
--automatic-renewal \
|
||||||
|
--renew-hook "service nginx reload" \
|
||||||
|
--domain "$domain" \
|
||||||
|
"$domain"
|
||||||
|
|
||||||
|
# configure nginx
|
||||||
|
require="__package/nginx __letsencrypt_cert/$domain" \
|
||||||
|
__file "/etc/nginx/sites-enabled/https-$domain" \
|
||||||
|
--source - --mode 0644 << EOF
|
||||||
|
upstream _bottle {
|
||||||
|
server unix:$apphome/uwsgi.sock;
|
||||||
|
}
|
||||||
|
|
||||||
|
server {
|
||||||
|
listen 443;
|
||||||
|
listen [::]:443;
|
||||||
|
|
||||||
|
server_name $domain;
|
||||||
|
|
||||||
|
access_log /var/log/nginx/access.log;
|
||||||
|
|
||||||
|
ssl on;
|
||||||
|
ssl_certificate /etc/letsencrypt/live/$domain/fullchain.pem;
|
||||||
|
ssl_certificate_key /etc/letsencrypt/live/$domain/privkey.pem;
|
||||||
|
|
||||||
|
client_max_body_size 256m;
|
||||||
|
|
||||||
|
location / {
|
||||||
|
try_files \$uri @uwsgi;
|
||||||
|
}
|
||||||
|
|
||||||
|
location @uwsgi {
|
||||||
|
include uwsgi_params;
|
||||||
|
uwsgi_pass _bottle;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
EOF
|
||||||
|
|
||||||
|
Creating __sample_bottle_hosting type gencode-remote
|
||||||
|
----------------------------------------------------
|
||||||
|
|
||||||
|
Now define **gencode-remote** script: ~/.cdist/type/__sample_bottle_hosting/gencode-remote.
|
||||||
|
After manifest is applied it should restart uWSGI and nginx services so that our
|
||||||
|
configuration is active. Our gencode-remote looks like the following::
|
||||||
|
|
||||||
|
echo "service uwsgi restart"
|
||||||
|
echo "service nginx restart"
|
||||||
|
|
||||||
|
Our **__sample_bottle_hosting** type is now finished.
|
||||||
|
|
||||||
|
Creating __sample_nginx_http_letsencrypt_and_ssl_redirect type
|
||||||
|
--------------------------------------------------------------
|
||||||
|
|
||||||
|
Let's now create **__sample_nginx_http_letsencrypt_and_ssl_redirect** type::
|
||||||
|
|
||||||
|
cd ~/.cdist/type
|
||||||
|
mkdir __sample_nginx_http_letsencrypt_and_ssl_redirect
|
||||||
|
cd __sample_nginx_http_letsencrypt_and_ssl_redirect
|
||||||
|
mkdir parameter
|
||||||
|
echo webroot > parameter/required
|
||||||
|
touch manifest
|
||||||
|
touch gencode-remote
|
||||||
|
|
||||||
|
Edit manifest::
|
||||||
|
|
||||||
|
domain="$__object_id"
|
||||||
|
webroot="$(cat "$__object/parameter/webroot")"
|
||||||
|
# make sure we have nginx package
|
||||||
|
__package nginx
|
||||||
|
# setup Let's Encrypt HTTP acme challenge, redirect HTTP to HTTPS
|
||||||
|
require="__package/nginx" __file "/etc/nginx/sites-enabled/http-$domain" \
|
||||||
|
--source - --mode 0644 << EOF
|
||||||
|
server {
|
||||||
|
listen *:80;
|
||||||
|
listen [::]:80;
|
||||||
|
|
||||||
|
server_name $domain;
|
||||||
|
|
||||||
|
# Let's Encrypt
|
||||||
|
location /.well-known/acme-challenge/ {
|
||||||
|
root $webroot;
|
||||||
|
}
|
||||||
|
|
||||||
|
# Everything else -> SSL
|
||||||
|
location / {
|
||||||
|
return 301 https://\$host\$request_uri;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
EOF
|
||||||
|
|
||||||
|
Edit gencode-remote::
|
||||||
|
|
||||||
|
echo "service nginx reload"
|
||||||
|
|
||||||
|
Creating init manifest
|
||||||
|
----------------------
|
||||||
|
|
||||||
|
Next create init manifest::
|
||||||
|
|
||||||
|
cd ~/.cdist/manifest
|
||||||
|
printf "__sample_bottle_hosting --projectname sample --user app --domain \$__target_host sample\n" > sample
|
||||||
|
|
||||||
|
Using this init manifest our target host will be configured using our **__sample_bottle_hosting**
|
||||||
|
type with projectname *sample*, user *app* and domain equal to **__target_host**.
|
||||||
|
Here the last positional argument *sample* is type's object id. For details on
|
||||||
|
**__target_host** and **__object_id** see
|
||||||
|
`Environment variables (for reading) <cdist-reference.html#environment-variables-for-reading>`_
|
||||||
|
reference.
|
||||||
|
|
||||||
|
Configuring host
|
||||||
|
----------------
|
||||||
|
|
||||||
|
Finally configure test.ungleich.ch::
|
||||||
|
|
||||||
|
cdist config -v -i ~/.cdist/manifest/sample test.ungleich.ch
|
||||||
|
|
||||||
|
After cdist configuration is successfully finished our host is ready.
|
||||||
|
|
||||||
|
Creating python bottle application
|
||||||
|
----------------------------------
|
||||||
|
|
||||||
|
We now need to create Bottle application. As you remember from the beginning
|
||||||
|
of this walkthrough our type does not create the actual python application,
|
||||||
|
its intention is only to configure hosing for specified user and project.
|
||||||
|
It is up to the user to create his/her applications.
|
||||||
|
|
||||||
|
Become app user::
|
||||||
|
|
||||||
|
su -l app
|
||||||
|
|
||||||
|
Preparing database
|
||||||
|
~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
We need to prepare database for our application. Create table and
|
||||||
|
insert some items::
|
||||||
|
|
||||||
|
psql -c "create table items (item varchar(255));"
|
||||||
|
|
||||||
|
psql -c "insert into items(item) values('spam');"
|
||||||
|
psql -c "insert into items(item) values('eggs');"
|
||||||
|
psql -c "insert into items(item) values('sausage');"
|
||||||
|
|
||||||
|
Creating application
|
||||||
|
~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Next create sample app::
|
||||||
|
|
||||||
|
cd /home/app/app
|
||||||
|
mkdir sample
|
||||||
|
cd sample
|
||||||
|
|
||||||
|
Create app.py with the following content::
|
||||||
|
|
||||||
|
#!/usr/bin/env python3
|
||||||
|
|
||||||
|
import bottle
|
||||||
|
import bottle_pgsql
|
||||||
|
|
||||||
|
app = application = bottle.Bottle()
|
||||||
|
plugin = bottle_pgsql.Plugin('dbname=app user=app password=')
|
||||||
|
app.install(plugin)
|
||||||
|
|
||||||
|
@app.route('/')
|
||||||
|
def show_index(db):
|
||||||
|
db.execute('select * from items')
|
||||||
|
items = db.fetchall() or []
|
||||||
|
rv = '<html><body><h3>Items:</h3><ul>'
|
||||||
|
for item in items:
|
||||||
|
rv += '<li>' + str(item['item']) + '</li>'
|
||||||
|
rv += '</ul></body></html>'
|
||||||
|
return rv
|
||||||
|
|
||||||
|
if __name__ == '__main__':
|
||||||
|
bottle.run(app=app, host='0.0.0.0', port=8080)
|
||||||
|
|
||||||
|
Create wsgi.py with the following content::
|
||||||
|
|
||||||
|
import os
|
||||||
|
|
||||||
|
os.chdir(os.path.dirname(__file__))
|
||||||
|
|
||||||
|
import app
|
||||||
|
application = app.app
|
||||||
|
|
||||||
|
We have configured uWSGI with **touch-reload = $projectname/wsgi.py** so after
|
||||||
|
we have changed our **wsgi.py** file uWSGI reloads the application.
|
||||||
|
|
||||||
|
Our application selects and lists items from **items** table.
|
||||||
|
|
||||||
|
Openning application
|
||||||
|
~~~~~~~~~~~~~~~~~~~~
|
||||||
|
|
||||||
|
Finally try the application::
|
||||||
|
|
||||||
|
http://test.ungleich.ch/
|
||||||
|
|
||||||
|
It should redirect to HTTPS and return:
|
||||||
|
|
||||||
|
.. container:: highlight
|
||||||
|
|
||||||
|
.. raw:: html
|
||||||
|
|
||||||
|
<h3>Items:</h3>
|
||||||
|
|
||||||
|
<ul>
|
||||||
|
<li>spam</li>
|
||||||
|
<li>eggs</li>
|
||||||
|
<li>sausage</li>
|
||||||
|
</ul>
|
||||||
|
|
||||||
|
What's next?
|
||||||
|
------------
|
||||||
|
|
||||||
|
Continue reading next sections ;)
|
||||||
|
|
@ -16,6 +16,7 @@ Contents:
|
||||||
cdist-support
|
cdist-support
|
||||||
cdist-features
|
cdist-features
|
||||||
cdist-quickstart
|
cdist-quickstart
|
||||||
|
cdist-real-world
|
||||||
man1/cdist
|
man1/cdist
|
||||||
cdist-bootstrap
|
cdist-bootstrap
|
||||||
cdist-configuration
|
cdist-configuration
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue