Centos7升级内核&安装docker（centos7.4安装docker）

上一篇写了centos7的最小化安装后的优化内容这里接上一篇简单记录下docker的安装。

具体内容如下：

### 升级内核、视自己情况定是否升级内核

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

yum -y install https://www.elrepo.org/elrepo-release-7.0-4.el7.elrepo.noarch.rpm

yum -y install perl

yum --disablerepo=\* --enablerepo=elrepo-kernel install -y kernel-ml.x86_64 kernel-ml-devel.x86_64

grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg

grubby --default-kernel #查看默认内核

###升级软件、不升级内核

yum --exclude=kernel* update

yum -y install yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

###查看docker版本

yum list docker-ce.x86_64 --showduplicates | sort -r

###安装指定版本

yum -y install docker-ce-19.03.13-3.el7.x86_64

### docker一些优化内容

mkdir -p /etc/docker

tee /etc/docker/daemon.json <<-'EOF'

{

"exec-opts": ["native.cgroupdriver=systemd"],

"max-concurrent-downloads": 10,

"registry-mirrors": [

"https://1nj0zren.mirror.aliyuncs.com",

"https://docker.mirrors.ustc.edu.cn",

"https://registry.docker-cn.com"

],

"storage-driver": "overlay2",

"storage-opts": [

"overlay2.override_kernel_check=true"

],

"log-driver": "json-file",

"log-opts": {

"max-size": "100m",

"max-file": "3"

}

}

EOF

systemctl daemon-reload

systemctl enable docker

systemctl start docker