Operations6 分钟 读完 (大约 950 个字)

[NOTE] 安装hadoop相关注意事项

  • linux在启动过程中通过读取/etc/profile文件中内容完成相关环境的载入，而ssh登陆远程主机的时候并不会加载/etc/profile中的配置文件。

    因此jdk安装完成后需要两次配置，一为配置/etc/profile中的环境变量，二将hadoop启动脚本中调用的HADOOP_HOME改为绝对路径的形式。

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Operations1 分钟 读完 (大约 116 个字)

[NOTE] Linux防火墙

CentOS firewalld

Firewalld is installed on CentOS 7 as default. Here comes some operations of it.

  • Check firewall status: sudo firewall-cmd --state
  • Disable firewalld: sudo systemctl disable firewalld(禁止开机启动)
  • Stop firewalld: sudo systemctl stop firewalld

Ubuntu 18.04 ufw

  • check a current firewall status:sudo ufw status
  • for more verbose:sudo ufw status verbose
  • enable firewall:sudo ufw enable
  • disable firewall:sudo ufw disable

基操：

  • sudo ufw default deny incoming
  • sudo ufw default allow outgoing
  • sudo ufw allow ssh or sudo ufw allow 22
  • sudo ufw allow 2222
  • sudo ufw allow http or sudo ufw allow 80
  • sudo ufw allow https or sudo ufw allow 443
  • sudo ufw allow 6000:6003/tcp
  • sudo ufw allow 6000:6003/udp
Operations2 分钟 读完 (大约 323 个字)

[NOTE] CentOS换源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

yum makecache

补充Ubuntu

/etc/apt/sources.list

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##中科大源

deb https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-updates main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-security main restricted universe multiverse
deb https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.ustc.edu.cn/ubuntu/ bionic-proposed main restricted universe multiverse

# 阿里源
deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

sudo apt-get update

sudo apt-get upgrade

不加-get会有部分更新失败

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