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/etc (:one::four:/etc/sysctl.conf (:moneybag:调优 (:one:NFS客户端的套接字缓冲区大小 (cat…

- - - - cat >> /etc/sysctl.conf <<EOF net.core.wmem.default=8388608 net.core.rmem_default=8388608 net.core.rmem_max=16777216 net.core.wmem_max=16777216 EOF
      - :star:net.core.wmem.default=xxx <=> /proc/sys/net/core/wmem_default
- - - - cd /etc/profile.d/ echo "hello" > hello.sh chmod +x hello.sh exit # 再登录一遍就有了
- - - - :explode::one:重启时直接输入root密码,进入root的shell :two:修改/etc/fstab不能(因为文件系统只读了) :three:输入mount -o rw,remount / :four:修改/etc/fstab :five:重启就ok了
- - - - :warning:只针对eth0网卡
- - - - :pencil2:给house组添加useradd的sudo权限
        
        saber ALL=(ALL) /usr/bin/rm,/usr/sbin/useradd %house ALL=(ALL) /usr/bin/rm,/usr/sbin/useradd # 给house组添加rm和useradd权限
      - :pencil2:orris不用密码
        
        orris ALL=(ALL) NOPASSWD:ALL
      - :pencil2:orris不能添加用户,其他都可以sudo
        
        orris ALL=(ALL) ALL,!/usr/sbin/useradd
      - :pencil2:检查语法
        
        visudo -c
    - - :one:!
        
        :explode:不能使用这个命令
        
        :pencil2:不能删除用户,其他都而已
        
        ALL,!/usr/sbin/userdel
      - :two:别名
        
        :explode:可以给用户/组/命令集合设置别名,方便统一设置
        
        :pencil2:saber和orris都可以进行sudo 添加用户和删除用户
        
        User_Alias FATE = orris,saber Cmnd_Alias USER = /usr/sbin/useradd, /usr/sbin/userdel FATE ALL=(ALL) USER
        
        :fire:大写
    - - :explode:用户主机=(角色) 命令