新装系统操作步骤

0 更换系统源

采用腾讯源

mv /etc/yum.repo/CentOS.repo CentOS.repo.Backup
wget -O /etc/yum.repos.d/docker-ce.repo https://download.docker.com/linux/centos/docker-ce.repo
sudo sed -i 's+download.docker.com+mirrors.cloud.tencent.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo
sudo yum makecache fast

1 epel安装

yum install epel-release -y

2 系统更新

yum update -y

3 常用组件工具安装

yum install htop git vim net-tools telnet zip unzip -y

4 Docker配置

# vim /etc/docker/daemon.json
{
    "registry-mirrors": ["https://d3is0bty.mirror.aliyuncs.com","http://f1361db2.m.daocloud.io"],
    "insecure-registries": ["http://hub.nercoa.com"],
    "data-root": "/mnt/sdb2/DockerRootDir",
    "storage-driver": "overlay2",
    "log-driver":"json-file",
    "log-opts": {"max-size":"500m", "max-file":"3"}
}

#  "graph": "/mnt/docker-data", 亦可指定Docker的根目录位置。

5 命令自动补全

yum install bash-completion -y 安装好后，重新登陆即可（刷新bash环境）。

6 防火墙，SELINUX

systemctl stop firewalld.service && systemctl disable firewalld.service

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

reboot

7 启用IPV4转发功能

Docker启动报错WARNING：IPv4 forwarding is disabled. Networking will not work.

解决办法：

vim /etc/sysctl.conf

net.ipv4.ip_forward=1 # 添加这段代码

重启network服务

systemctl restart network && systemctl restart docker

查看是否修改成功 （备注：返回1，就是成功）

sysctl net.ipv4.ip_forward
正常会输出net.ipv4.ip_forward = 1

8 SSH配置

• 修改ssh端口号
• 上传公钥
• 修改断开时间

#Port 22
Port $(YourPort)

ClientAliveInterval 600
ClientAliveCountMax 3