Alibaba Cloud server centos6.x upgrades the kernel to be able to install docker

• The centos version is 6.9, because docker needs to be installed, so the kernel needs to be upgraded
• Upgrade steps:
  • First import the public key:

    rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org

  • Import source:

    rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm

  • Then choose to install the latest version of the kernel, or the stable version of the kernel:

    #new
    yum –enablerepo=elrepo-kernel install -y kernel-ml
    #stable version
    yum --enablerepo=elrepo-kernel install kernel-lt -y

  • Finally edit the /etc/grub.conf startup file:

    vim /etc/grub.conf
    #title order from top to bottom 0,1,2
    #Default new ones should be at the top
    #So change the default value to 0
    default=0

  • Then reboot:

    reboot

  • View version information:

    cat /etc/issue
    uname -ir # someone uname -a

    

    

  • Install docker:

    #install docker
    #1. Turn off selinux
    	setenforce 0
    	sed -i '/^SELINUX=/c\SELINUX=disabled' /etc/selinux/config
    #2. Download and install epel
    	wget http://mirrors.sohu.com/fedora-epel/6/x86_64/epel-release-6-8.noarch.rpm
    	rpm -ivh epel-release-6-8.noarch.rpm
    	sed -i 's/^mirrorlist=https/mirrorlist=http/' /etc/yum.repos.d/epel.repo
    #3. Install docker-io
    	yum -y install docker-io
    #4. Start docker
    	service docker start
    #5. Check the docker version
    	docker version #or docker -v