CentOS7虛擬機優化

CentOS7：

1. 將網卡配置重點關注的地方爲：

   [root@master ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33 
   BOOTPROTO=static
   # UUID=ca1110e0-295f-4ca2-80ef-fc6b0ee6d4cd
   ONBOOT=yes
   IPADDR=192.168.225.151
   NETMASK=255.255.255.0
   GATEWAY=192.168.225.2
   DNS1=223.5.5.5
   DNS2=223.6.6.6

2. yum源配置,阿里雲的yum源（Base和epel）

   mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
   
   # Base源
   CentOS 6
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
   或者
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
   
   
   CentOS 7
   wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   或者
   curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
   
   
   # epel源（若有配置其餘epel源，則須要備份）
   mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
   
   mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
   
   
   wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
   
   
   
   # 最後
   yum clean all    # 清除緩存
   yum makecache    # 生成緩存
   yum repolist  # 驗證是否成功

3. 下載經常使用的軟件：

   yum -y install bash-completion lrzsz sysstat net-tools tree wget vim -y

4. 修改selinux和firewalld服務

   # selinux的位置: /etc/selinux/config
   sed -i s/SELINUX=enforcing/SELINUX=disabled/g /etc/selinux/config
   setenforce 0 # 臨時關閉
   getenforce       # 查看狀態
   
   
   # 關閉防火牆
   systemctl  status firewalld
   systemctl  stop firewalld
   systemctl  disable firewalld
   systemctl  status firewalld