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###Git2Docker – Server

##About:

Git2Docker.io Deploys apps and manages Containers with best practices right out of the box. Automatically doing all the things that were too complicated, expensive, or time consuming to do manually. And because it's open source.

Git2docker is a software to simplify, you just need a git client, with git2docker you don't need install any other tools, You can Deploy, Delete, Shutdown, Start, View Logs and more.

OS: Opensuse 13.2

zypper install docker
systemctl enable docker
systemctl start docker
systemctl enable sshd
systemctl start sshd

Disable the Firewall.

yast firewall disable

curl https://raw.githubusercontent.com/cooltrick/git2docker.io/master/install.sh | sh

zypper install go

git clone https://github.com/cooltrick/git2docker.io.git
cd git2docker.io
make
sudo make install

docker pull cooltrick/git2docker
docker pull cooltrick/git2docker:start
docker pull busybox
docker pull cooltrick/nginx-proxy

useradd -m user
gpasswd -a user docker
passwd user

###Git2Docker – Client

mkdir ~/.git2docker
ssh-keygen
cat ~/.ssh/id_rsa.pub | ssh user@192.168.100.56 git2docker

curl https://raw.githubusercontent.com/cooltrick/git2docker.io/master/git2docker-client/linux/g2docker -o g2docker
chmod +x g2docker

cat >  ~/.git2docker/git2docker.conf <<EOF
user=user
host=192.168.100.56
EOF


zypper install go

git clone https://github.com/cooltrick/git2docker.io.git
cd git2docker.io/git2docker-client/linux
make
chmod +x g2docker
cp -rf g2docker /usr/local/bin

cat >  ~/.git2docker/git2docker.conf <<EOF
user=user
host=192.168.100.56
EOF

###About git2docker.conf

The file git2docker.conf is necessary, the server read the file and get needed options to work.

git2docker.conf:

state options:

example:

state=build

domain option:

Provided your DNS is setup to forward your domain to the a host running nginx-proxy, the request will be routed to a container with the domain setted in git2docker.conf.

example:

domain=app.linux.site

pre-exec option:

Option used to execute a command before start the application.

example:

pre-exec=bundle exec rake db:create db:migrate db:seed

git Option:

If you have your code at an external repository like github, git2docker will download and deploy the application.

example:

git=https://github.com/heroku/node-js-sample

Exemple of git2docker.conf

state=build
domain=app.domain.lnx
pre-exec=bundle exec rake db:create db:migrate db:seed

###Deploy:

We will deploy a Node.js example application which starts a minimal HTTP server.

git clone https://github.com/heroku/node-js-sample
cd node-js-sample
git init

echo state=build > git2docker.conf
git add --all
git commit -m "build"
git remote add git2docker user@192.168.100.56:node-js-sample

git push git2docker master

@linux:/tmp/node-js-sample> git push git2docker master
Counting objects: 391, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (316/316), done.
Writing objects: 100% (391/391), 214.55 KiB | 0 bytes/s, done.
Total 391 (delta 46), reused 387 (delta 45)
remote: =======> Working - node-js-sample
remote:
-----> Using u1000 to run an application
-----> Node.js app detected

-----> Reading application state
       package.json...
       build directory...
       cache directory...
       environment variables...

       Node engine:         0.12.x
       Npm engine:          unspecified
       Start mechanism:     npm start
       node_modules source: npm-shrinkwrap.json
       node_modules cached: false

       NPM_CONFIG_PRODUCTION=true
       NODE_MODULES_CACHE=true

-----> Installing binaries
       Resolving node version 0.12.x via semver.io...
       Downloading and installing node 0.12.2...
       Using default npm version: 2.7.4

-----> Building dependencies
       Installing node modules
       express@4.12.3 node_modules/express
       ├── merge-descriptors@1.0.0
       ├── utils-merge@1.0.0
       ├── cookie-signature@1.0.6
       ├── methods@1.1.1
       ├── fresh@0.2.4
       ├── escape-html@1.0.1
       ├── cookie@0.1.2
       ├── range-parser@1.0.2
       ├── content-type@1.0.1
       ├── finalhandler@0.3.4
       ├── vary@1.0.0
       ├── parseurl@1.3.0
       ├── serve-static@1.9.2
       ├── content-disposition@0.5.0
       ├── path-to-regexp@0.1.3
       ├── depd@1.0.1
       ├── qs@2.4.1
       ├── etag@1.5.1 (crc@3.2.1)
       ├── on-finished@2.2.0 (ee-first@1.1.0)
       ├── debug@2.1.3 (ms@0.7.0)
       ├── proxy-addr@1.0.7 (forwarded@0.1.0, ipaddr.js@0.1.9)
       ├── send@0.12.2 (destroy@1.0.3, ms@0.7.0, mime@1.3.4)
       ├── accepts@1.2.5 (negotiator@0.5.1, mime-types@2.0.10)
       └── type-is@1.6.1 (media-typer@0.3.0, mime-types@2.0.10)

-----> Checking startup method
       No Procfile; Adding 'web: npm start' to new Procfile

-----> Finalizing build
       Creating runtime environment
       Exporting binary paths
       Cleaning npm artifacts
       Cleaning previous cache
       Caching results for future builds

-----> Build succeeded!

       node-js-sample@0.2.0 /tmp/build
       └── express@4.12.3

-----> Discovering process types
       Procfile declares types -> web
remote: node-js-sample Started
remote: 49153
To demo@localhost:node-js-sample
* [new branch]      master -> master



@linux:/tmp/node-js-sample> curl http://192.168.100.56:49153/
Hello World!

###Deploy - Using a Dockerfile

We will deploy a Apache(httpd) example application.

mkdir apache-demo
cd apache-demo

echo "FROM httpd:2.4" > Dockerfile
echo "EXPOSE 80" >> Dockerfile

echo state=dockerfile > git2docker.conf

git add --all
git commit -m "build"
git remote add git2docker user@192.168.100.56:apache-demo

git push git2docker master

@linux:/tmp/apache-demo> git push git2docker master
Counting objects: 4, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (4/4), 303 bytes | 0 bytes/s, done.
Total 4 (delta 0), reused 0 (delta 0)
remote: =======> Working - apache-demo
remote:
remote: Sending build context to Docker daemon 3.072 kB
remote: Sending build context to Docker daemon
remote: Step 0 : FROM httpd:2.4
remote:  ---> 4ea677a2d898
remote: Step 1 : EXPOSE 80
remote:  ---> Running in 2fe3a7300cdf
remote:  ---> 11d40bb1d4fe
remote: Removing intermediate container 2fe3a7300cdf
remote: Successfully built 11d40bb1d4fe
remote: apache-demo Started
remote: 49154
To demo@localhost:apache-demo
 * [new branch]      master -> master


@linux:/tmp/node-js-sample> curl http://192.168.100.56:49154/
It works!

###Manage Containers - Git Client

echo state=remove > git2docker.conf
git add --all
git commit -m "build"
git push git2docker master


echo state=stop > git2docker.conf
git add --all
git commit -m "build"
git push git2docker master


echo state=start > git2docker.conf
git add --all
git commit -m "build"
git push git2docker master


echo state=logs > git2docker.conf
git add --all
git commit -m "build"
git push git2docker master

###Manage Containers - Git2Docker-CLI Client


g2docker -ps
| apache-demo                    is Up |


g2docker -stop --name=apache-demo
| apache-demo                   Stoped |


g2docker -start --name=apache-demo
| apache-demo                  Started |


g2docker -logs --name=apache-demo
172.17.0.3 - - [16/Apr/2015:15:08:45 +0000] "GET / HTTP/1.1" 200 22698 "-" "
172.17.0.3 - - [16/Apr/2015:15:08:45 +0000] "GET / HTTP/1.1" 200 22698 "-" "
172.17.0.3 - - [16/Apr/2015:15:08:45 +0000] "GET / HTTP/1.1" 200 22698 "-" "
172.17.0.3 - - [16/Apr/2015:15:08:45 +0000] "GET / HTTP/1.1" 200 22698 "-" "
172.17.0.3 - - [16/Apr/2015:15:08:45 +0000] "GET / HTTP/1.1" 200 22698 "-" "
172.17.0.3 - - [16/Apr/2015:15:08:45 +0000] "GET / HTTP/1.1" 200 22698 "-" "

g2docker -remove --name=apache-demo
Please type yes or no and then press enter: yes
| apache-demo                  Deleted |

g2docker -env --name=apache-demo

####Nginx proxy:

If you not set the domain option, the nginx-proxy will publish the domain using appname.username

cd /etc/systemd/system

cat >  nginx-proxy.service  <<EOF
[Unit]
Description=nginx-proxy
After=docker.service
Requires=docker.service

[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill nginx-proxy
ExecStartPre=-/usr/bin/docker rm nginx-proxy
ExecStart=/usr/bin/docker run -d --name=nginx-proxy -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock cooltrick/nginx-proxy

[Install]
WantedBy=multi-user.target
EOF

systemctl enable /etc/systemd/system/nginx-proxy.service
systemctl start nginx-proxy.service

Deploy any Container setting domain option in git2docker.conf and test.

If you haven't a DNS server, You can add the domain at /etc/hosts.

Example of /etc/hosts file:

192.168.100.56       apache-demo.git2docker
192.168.100.56       nodejs.git2docker

##Integration with Databases:

###Suported Databases:

##Deploy Database:

To deploy database just create a git2docker_db.conf file.

git2docker_db.conf Examples:

Redis Example:

image=redis

Mysql Example:

image=mysql
user=dbuser
password=dbpass
database=dbname

Postgresql Example:

image=mysql
user=dbuser
password=dbpass
database=dbname

##Deploy Application using Database:

Database Server Address aways be "database"

Example:

PHP with Mysql Using Dockerfile:

mkdir demo-php
cd demo-php

FROM php:5.6-apache
EXPOSE 80
RUN docker-php-ext-install mysql
ADD index.php /var/www/html/index.php

state=Dockerfile
domain=apache.git2docker

image=mysql
user=dbuser
password=dbpass
database=dbname

If this file exist, git2docker will execute sql.

DROP TABLE IF EXISTS employees;
CREATE TABLE employees (id INT, first_name VARCHAR(20), last_name VARCHAR(30));
INSERT INTO employees (id, first_name, last_name) VALUES (1, 'Bill', 'Doe');
INSERT INTO employees (id, first_name, last_name) VALUES (2, 'Bob', 'Smith');
INSERT INTO employees (id, first_name, last_name) VALUES (3, 'Jane', 'Doe');


<?php
$servername = "database";
$username = "dbuser";
$password = "dbpass";
$dbname = "dbname";

$link = mysql_connect($servername, $username, $password);
mysql_select_db($dbname, $link);
mysql_set_charset('UTF-8', $link);


$result = mysql_query('SELECT * from employees') or die(mysql_error());
 
$num_rows = mysql_num_rows($result);
 
while($row = mysql_fetch_assoc($result)) {
   echo $row['first_name'].' '.$row['last_name']; //etc...
   echo "<br>";
}
?>

##Deploy Example App:

git add --all
git commit -m "build"
git remote add git2docker user@192.168.100.56:demo-php

git push git2docker master