how-to-instal-docker-on-centos-6.html

#1. UPDATE YUM
yum update


#2. UPGRADE KERNEL

#See http://bicofino.io/2014/10/25/install-kernel-3-dot-10-on-centos-6-dot-5/

#As root:

#Set proxy if needed; replace ip:port with your own
export http_proxy="http://1.2.3.4:3128"
export https_proxy="http://1.2.3.4:3128" 

#Install new kernel

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org  
rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm
yum --enablerepo=elrepo-kernel install kernel-lt

#for running VirtualBox integration package
#  yum --enablerepo=elrepo-kernel install kernel-lt-devel
#  yum install gcc
#run VirtualBox integration package
#reboot if: - VirtualBox build not seeing kernel headers from devel OR
#               - Integration not working properly (i.e. bidirectional clipboard)

#Set boot to new kernel

#In /etc/grub.conf, set default to the new kernel version, example:

default=0  
timeout=5  
splashimage=(hd0,0)/grub/splash.xpm.gz  
hiddenmenu  
title CentOS (3.10.55-1.el6.elrepo.x86_64)  
    root (hd0,0)
    kernel /vmlinuz-3.10.55-1.el6.elrepo.x86_64 ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS LANG=en_US.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=VolGroup/lv_root rd_NO_DM  KEYBOARDTYPE=pc KEYTABLE=br-abnt2 rhgb quiet
...

#Reboot machine
reboot


#3. INSTALL DOCKER

#if docker existing, stop all docker containers
killall docker

#Add cgroup to /etc/fstab
cgroup                    /sys/fs/cgroup         cgroup   defaults        0 0
mount /sys/fs/cgroup

#Or, as an alternative
mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup

#install docker binary
curl -fsSLO https://get.docker.com/builds/Linux/x86_64/docker-1.12.0.tgz && tar --strip-components=1 -xvzf docker-1.12.0.tgz -C /usr/local/bin

#configure proxy for docker daemon; replace ip:port with your own
cat <<EOF | sudo tee -a /etc/sysconfig/docker
export http_proxy="http://1.2.3.4:3128"
export https_proxy="http://1.2.3.4:3128" 
export no_proxy="localhost, 127.0.0.1"
EOF

#give users right to execute docker
groupadd docker
usermod -aG docker jenkins

#generate ssh keys if needed
#start docker daemon
dockerd --tls --tlscacert=/root/.docker/ca.crt --tlscert=/root/.docker/jenkins.crt --tlskey=/root/.docker/jenkins.key
#If client verification needed for ssh then add --tlsverify
#dockerd --tlsverify --tlscacert=/root/.docker/ca.crt --tlscert=/root/.docker/jenkins.crt --tlskey=/root/.docker/jenkins.key

#Docker to start at boot
chkconfig --add docker
chkconfig docker on

service docker start

#prepare docker container environment
export DOCKER_HOST="tcp://$HOST:2376"

#4. OPTIONAL
#create dir for jenkins volume
mkdir /app/jenkins && chgroup jenkins 1000

#Install and run jenkins with java
docker --tls run -d --restart unless-stopped --name jenkins -p 8080:8080 -p 50000:50000 --env "JENKINS_OPTS=--prefix=/jenkins2" --env "JAVA_OPTS=-Dhttps.proxyHost=10.15.111.69 -Dhttps.proxyPort=3128 -Dhttp.proxyHost=10.15.111.69 -Dhttp.proxyPort=3128 -Dhttp.nonProxyHosts=\"localhost|other-server\"" -v /app/jenkins:/var/jenkins_home jenkins:2.7.2-alpine