Deploying PHP applications in tsuru¶
Overview¶
This document is a hands-on guide to deploying a simple PHP application in tsuru. The example application will be a very simple Wordpress project associated to a MySQL service. It’s applicable to any php over apache application.
Creating the app in tsuru¶
To create an app, you use the command app-create:
$ tsuru app-create <app-name> <app-platform>
For PHP, the app platform is, guess what, php! Let’s be over creative
and develop a never-developed tutorial-app: a blog, and its name will also be
very creative, let’s call it “blog”:
$ tsuru app-create blog php
To list all available platforms, use the command platform-list.
You can see all your applications using the command app-list:
$ tsuru app-list
+-------------+-------------------------+--------------------------+
| Application | Units State Summary | Address |
+-------------+-------------------------+--------------------------+
| blog | 0 of 0 units in-service | blog.192.168.50.4.nip.io |
+-------------+-------------------------+--------------------------+
Application code¶
This document will not focus on how to write a php blog, you can download the entire source direct from wordpress: http://wordpress.org/latest.zip. Here is all you need to do with your project:
# Download and unpack wordpress
$ wget http://wordpress.org/latest.zip
$ unzip latest.zip
# Preparing wordpress for tsuru
$ cd wordpress
# Notify tsuru about the necessary packages
$ echo php5-mysql > requirements.apt
# Preparing the application to receive the tsuru environment related to the mysql service
$ sed "s/'database_name_here'/getenv('MYSQL_DATABASE_NAME')/; \
s/'username_here'/getenv('MYSQL_USER')/; \
s/'localhost'/getenv('MYSQL_HOST')/; \
s/'password_here'/getenv('MYSQL_PASSWORD')/" \
wp-config-sample.php > wp-config.php
# Creating a local Git repository
$ git init
$ git add .
$ git commit -m 'initial project version'
Git deployment¶
When you create a new app, tsuru will display the Git remote that you should use. You can always get it using the command app-info:
$ tsuru app-info --app blog
Application: blog
Repository: git@192.168.50.4.nip.io:blog.git
Platform: php
Teams: admin
Address: blog.192.168.50.4.nip.io
Owner: admin@example.com
Team owner: admin
Deploys: 0
Pool: theonepool
App Plan:
+---------------+--------+------+-----------+--------+---------+
| Name | Memory | Swap | Cpu Share | Router | Default |
+---------------+--------+------+-----------+--------+---------+
| autogenerated | 0 MB | 0 MB | 100 | | false |
+---------------+--------+------+-----------+--------+---------+
The Git remote will be used to deploy your application using Git. You can just push to tsuru remote and your project will be deployed:
$ git push git@192.168.50.4.nip.io:blog.git master
Counting objects: 1295, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (1271/1271), done.
Writing objects: 100% (1295/1295), 6.09 MiB | 5.65 MiB/s, done.
Total 1295 (delta 102), reused 0 (delta 0)
remote: text
remote: Deploying the PHP application...
remote: tar: Removing leading `/' from member names
#########################################
# OMIT DEPENDENCIES STEPS (see below) #
#########################################
remote:
remote: ---- Building application image ----
remote: ---> Sending image to repository (51.40MB)
remote: ---> Cleaning up
remote:
remote: ---- Starting 1 new unit ----
remote: ---> Started unit 027c2a31a0...
remote:
remote: ---- Binding and checking 1 new units ----
remote: ---> Bound and checked unit 027c2a31a0
remote:
remote: ---- Adding routes to 1 new units ----
remote: ---> Added route to unit 027c2a31a0
remote:
remote: OK
To git@192.168.50.4.nip.io:blog.git
* [new branch] master -> master
If you get a “Permission denied (publickey).”, make sure you’re member of a team and have a public key added to tsuru. To add a key, use the command key-add:
$ tsuru key-add mykey ~/.ssh/id_dsa.pub
You can use git remote add to avoid typing the entire remote url every time
you want to push:
$ git remote add tsuru git@192.168.50.4.nip.io:blog.git
Then you can run:
$ git push tsuru master
Everything up-to-date
And you will be also able to omit the --app flag from now on:
$ tsuru app-info
Application: blog
Repository: git@192.168.50.4.nip.io:blog.git
Platform: php
Teams: admin
Address: blog.192.168.50.4.nip.io
Owner: admin@example.com
Team owner: admin
Deploys: 1
Pool: theonepool
Units: 1
+------------+---------+
| Unit | State |
+------------+---------+
| 027c2a31a0 | started |
+------------+---------+
App Plan:
+---------------+--------+------+-----------+--------+---------+
| Name | Memory | Swap | Cpu Share | Router | Default |
+---------------+--------+------+-----------+--------+---------+
| autogenerated | 0 MB | 0 MB | 100 | | false |
+---------------+--------+------+-----------+--------+---------+
Listing dependencies¶
In the last section we omitted the dependencies step of deploy. In tsuru, an application can have two kinds of dependencies:
- Operating system dependencies, represented by packages in the package manager
of the underlying operating system (e.g.:
yumandapt-get); - Platform dependencies, represented by packages in the package manager of the
platform/language (e.g. in Python,
pip).
All apt-get dependencies must be specified in a requirements.apt file,
located in the root of your application, and pip dependencies must be located
in a file called requirements.txt, also in the root of the application.
Since we will use MySQL with PHP, we need to install the package depends on just
one apt-get package:
php5-mysql, so here is how requirements.apt
looks like:
php5-mysql
You can see the complete output of installing these dependencies below:
% git push tsuru master
#####################################
# OMIT #
#####################################
Counting objects: 1155, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (1124/1124), done.
Writing objects: 100% (1155/1155), 4.01 MiB | 327 KiB/s, done.
Total 1155 (delta 65), reused 0 (delta 0)
remote: Cloning into '/home/application/current'...
remote: Reading package lists...
remote: Building dependency tree...
remote: Reading state information...
remote: The following extra packages will be installed:
remote: libmysqlclient18 mysql-common
remote: The following NEW packages will be installed:
remote: libmysqlclient18 mysql-common php5-mysql
remote: 0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
remote: Need to get 1042 kB of archives.
remote: After this operation, 3928 kB of additional disk space will be used.
remote: Get:1 http://archive.ubuntu.com/ubuntu/ quantal/main mysql-common all 5.5.27-0ubuntu2 [13.7 kB]
remote: Get:2 http://archive.ubuntu.com/ubuntu/ quantal/main libmysqlclient18 amd64 5.5.27-0ubuntu2 [949 kB]
remote: Get:3 http://archive.ubuntu.com/ubuntu/ quantal/main php5-mysql amd64 5.4.6-1ubuntu1 [79.0 kB]
remote: Fetched 1042 kB in 1s (739 kB/s)
remote: Selecting previously unselected package mysql-common.
remote: (Reading database ... 23874 files and directories currently installed.)
remote: Unpacking mysql-common (from .../mysql-common_5.5.27-0ubuntu2_all.deb) ...
remote: Selecting previously unselected package libmysqlclient18:amd64.
remote: Unpacking libmysqlclient18:amd64 (from .../libmysqlclient18_5.5.27-0ubuntu2_amd64.deb) ...
remote: Selecting previously unselected package php5-mysql.
remote: Unpacking php5-mysql (from .../php5-mysql_5.4.6-1ubuntu1_amd64.deb) ...
remote: Processing triggers for libapache2-mod-php5 ...
remote: * Reloading web server config
remote: ...done.
remote: Setting up mysql-common (5.5.27-0ubuntu2) ...
remote: Setting up libmysqlclient18:amd64 (5.5.27-0ubuntu2) ...
remote: Setting up php5-mysql (5.4.6-1ubuntu1) ...
remote: Processing triggers for libc-bin ...
remote: ldconfig deferred processing now taking place
remote: Processing triggers for libapache2-mod-php5 ...
remote: * Reloading web server config
remote: ...done.
remote: sudo: unable to resolve host 8cf20f4da877
remote: sudo: unable to resolve host 8cf20f4da877
remote: debconf: unable to initialize frontend: Dialog
remote: debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
remote: debconf: falling back to frontend: Readline
remote: debconf: unable to initialize frontend: Dialog
remote: debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
remote: debconf: falling back to frontend: Readline
remote:
remote: Creating config file /etc/php5/mods-available/mysql.ini with new version
remote: debconf: unable to initialize frontend: Dialog
remote: debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
remote: debconf: falling back to frontend: Readline
remote:
remote: Creating config file /etc/php5/mods-available/mysqli.ini with new version
remote: debconf: unable to initialize frontend: Dialog
remote: debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
remote: debconf: falling back to frontend: Readline
remote:
remote: Creating config file /etc/php5/mods-available/pdo_mysql.ini with new version
remote:
remote: ---> App will be restarted, please check its log for more details...
remote:
To git@192.168.50.4.nip.io:blog.git
* [new branch] master -> master
Running the application¶
As you can see, in the deploy output there is a step described as “App will be
restarted”. In this step, tsuru will restart your app if it’s running, or start
it if it’s not.
Now that the app is deployed, you can access it from your browser, getting the
IP or host listed in app-list and opening it. For example,
in the list below:
$ tsuru app-list
+-------------+-------------------------+---------------------+
| Application | Units State Summary | Address |
+-------------+-------------------------+---------------------+
| blog | 1 of 1 units in-service | blog.cloud.tsuru.io |
+-------------+-------------------------+---------------------+
Customizing the platform¶
The PHP platform supports customizations in the frontend and the interpreter, for more details, check the README of the platform.
Going further¶
For more information, you can dig into tsuru docs, or read complete instructions of use for the tsuru command.