Instalar tomcat + Jenkins + Git + maven2 en Debian 8

Partiende de una instalación limpia de Debian 8  ejecutamos los siguientes comandos

apt-get --assume-yes update

apt-get --assume-yes upgrade

apt-get --assume-yes install default-jre

apt-get --assume-yes install default-jdk

apt-get --assume-yes  install tomcat7 tomcat7-admin tomcat7-common tomcat7-docs tomcat7-examples tomcat7-user

apt-get  --assume-yes install git 
apt-get  --assume-yes install maven2
mkdir /usr/share/tomcat7/.m2

cd /var/lib/tomcat7/webapps

wget http://mirrors.jenkins.io/war-stable/latest/jenkins.war

sudo mkdir /usr/share/tomcat7/.jenkins

sudo chown tomcat7:nogroup /usr/share/tomcat7/.jenkins

service tomcat7 restart

por último acceder a localhost:8080 y localhost:8080/jenkins